1 //===-- SIISelLowering.cpp - SI DAG Lowering Implementation ---------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
11 /// \brief Custom DAG lowering for SI
13 //===----------------------------------------------------------------------===//
17 #define _USE_MATH_DEFINES
21 #include "SIISelLowering.h"
23 #include "AMDGPUIntrinsicInfo.h"
24 #include "AMDGPUSubtarget.h"
25 #include "SIInstrInfo.h"
26 #include "SIMachineFunctionInfo.h"
27 #include "SIRegisterInfo.h"
28 #include "llvm/ADT/BitVector.h"
29 #include "llvm/CodeGen/CallingConvLower.h"
30 #include "llvm/CodeGen/MachineInstrBuilder.h"
31 #include "llvm/CodeGen/MachineRegisterInfo.h"
32 #include "llvm/CodeGen/SelectionDAG.h"
33 #include "llvm/IR/Function.h"
34 #include "llvm/ADT/SmallString.h"
38 SITargetLowering::SITargetLowering(TargetMachine &TM,
39 const AMDGPUSubtarget &STI)
40 : AMDGPUTargetLowering(TM, STI) {
41 addRegisterClass(MVT::i1, &AMDGPU::VReg_1RegClass);
42 addRegisterClass(MVT::i64, &AMDGPU::SReg_64RegClass);
44 addRegisterClass(MVT::v32i8, &AMDGPU::SReg_256RegClass);
45 addRegisterClass(MVT::v64i8, &AMDGPU::SReg_512RegClass);
47 addRegisterClass(MVT::i32, &AMDGPU::SReg_32RegClass);
48 addRegisterClass(MVT::f32, &AMDGPU::VGPR_32RegClass);
50 addRegisterClass(MVT::f64, &AMDGPU::VReg_64RegClass);
51 addRegisterClass(MVT::v2i32, &AMDGPU::SReg_64RegClass);
52 addRegisterClass(MVT::v2f32, &AMDGPU::VReg_64RegClass);
54 addRegisterClass(MVT::v4i32, &AMDGPU::SReg_128RegClass);
55 addRegisterClass(MVT::v4f32, &AMDGPU::VReg_128RegClass);
57 addRegisterClass(MVT::v8i32, &AMDGPU::SReg_256RegClass);
58 addRegisterClass(MVT::v8f32, &AMDGPU::VReg_256RegClass);
60 addRegisterClass(MVT::v16i32, &AMDGPU::SReg_512RegClass);
61 addRegisterClass(MVT::v16f32, &AMDGPU::VReg_512RegClass);
63 computeRegisterProperties(STI.getRegisterInfo());
65 setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v8i32, Expand);
66 setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v8f32, Expand);
67 setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v16i32, Expand);
68 setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v16f32, Expand);
70 setOperationAction(ISD::ADD, MVT::i32, Legal);
71 setOperationAction(ISD::ADDC, MVT::i32, Legal);
72 setOperationAction(ISD::ADDE, MVT::i32, Legal);
73 setOperationAction(ISD::SUBC, MVT::i32, Legal);
74 setOperationAction(ISD::SUBE, MVT::i32, Legal);
76 setOperationAction(ISD::FSIN, MVT::f32, Custom);
77 setOperationAction(ISD::FCOS, MVT::f32, Custom);
79 setOperationAction(ISD::FMINNUM, MVT::f64, Legal);
80 setOperationAction(ISD::FMAXNUM, MVT::f64, Legal);
82 // We need to custom lower vector stores from local memory
83 setOperationAction(ISD::LOAD, MVT::v4i32, Custom);
84 setOperationAction(ISD::LOAD, MVT::v8i32, Custom);
85 setOperationAction(ISD::LOAD, MVT::v16i32, Custom);
87 setOperationAction(ISD::STORE, MVT::v8i32, Custom);
88 setOperationAction(ISD::STORE, MVT::v16i32, Custom);
90 setOperationAction(ISD::STORE, MVT::i1, Custom);
91 setOperationAction(ISD::STORE, MVT::v4i32, Custom);
93 setOperationAction(ISD::SELECT, MVT::i64, Custom);
94 setOperationAction(ISD::SELECT, MVT::f64, Promote);
95 AddPromotedToType(ISD::SELECT, MVT::f64, MVT::i64);
97 setOperationAction(ISD::SELECT_CC, MVT::f32, Expand);
98 setOperationAction(ISD::SELECT_CC, MVT::i32, Expand);
99 setOperationAction(ISD::SELECT_CC, MVT::i64, Expand);
100 setOperationAction(ISD::SELECT_CC, MVT::f64, Expand);
102 setOperationAction(ISD::SETCC, MVT::v2i1, Expand);
103 setOperationAction(ISD::SETCC, MVT::v4i1, Expand);
105 setOperationAction(ISD::BSWAP, MVT::i32, Legal);
107 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Legal);
108 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v2i1, Custom);
109 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v4i1, Custom);
111 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8, Legal);
112 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v2i8, Custom);
113 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v4i8, Custom);
115 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16, Legal);
116 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v2i16, Custom);
117 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v4i16, Custom);
119 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i32, Legal);
120 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::Other, Custom);
122 setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
123 setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::f32, Custom);
124 setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::v16i8, Custom);
125 setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::v4f32, Custom);
127 setOperationAction(ISD::INTRINSIC_VOID, MVT::Other, Custom);
128 setOperationAction(ISD::BRCOND, MVT::Other, Custom);
130 for (MVT VT : MVT::integer_valuetypes()) {
134 setLoadExtAction(ISD::SEXTLOAD, VT, MVT::i1, Promote);
135 setLoadExtAction(ISD::SEXTLOAD, VT, MVT::i8, Legal);
136 setLoadExtAction(ISD::SEXTLOAD, VT, MVT::i16, Legal);
137 setLoadExtAction(ISD::SEXTLOAD, VT, MVT::i32, Expand);
139 setLoadExtAction(ISD::ZEXTLOAD, VT, MVT::i1, Promote);
140 setLoadExtAction(ISD::ZEXTLOAD, VT, MVT::i8, Legal);
141 setLoadExtAction(ISD::ZEXTLOAD, VT, MVT::i16, Legal);
142 setLoadExtAction(ISD::ZEXTLOAD, VT, MVT::i32, Expand);
144 setLoadExtAction(ISD::EXTLOAD, VT, MVT::i1, Promote);
145 setLoadExtAction(ISD::EXTLOAD, VT, MVT::i8, Legal);
146 setLoadExtAction(ISD::EXTLOAD, VT, MVT::i16, Legal);
147 setLoadExtAction(ISD::EXTLOAD, VT, MVT::i32, Expand);
150 for (MVT VT : MVT::integer_vector_valuetypes()) {
151 setLoadExtAction(ISD::SEXTLOAD, VT, MVT::v8i16, Expand);
152 setLoadExtAction(ISD::SEXTLOAD, VT, MVT::v16i16, Expand);
155 for (MVT VT : MVT::fp_valuetypes())
156 setLoadExtAction(ISD::EXTLOAD, VT, MVT::f32, Expand);
158 setTruncStoreAction(MVT::i64, MVT::i32, Expand);
159 setTruncStoreAction(MVT::v8i32, MVT::v8i16, Expand);
160 setTruncStoreAction(MVT::v16i32, MVT::v16i8, Expand);
161 setTruncStoreAction(MVT::v16i32, MVT::v16i16, Expand);
163 setOperationAction(ISD::LOAD, MVT::i1, Custom);
165 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
166 setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);
167 setOperationAction(ISD::FrameIndex, MVT::i32, Custom);
169 // These should use UDIVREM, so set them to expand
170 setOperationAction(ISD::UDIV, MVT::i64, Expand);
171 setOperationAction(ISD::UREM, MVT::i64, Expand);
173 setOperationAction(ISD::SELECT_CC, MVT::i1, Expand);
174 setOperationAction(ISD::SELECT, MVT::i1, Promote);
176 // We only support LOAD/STORE and vector manipulation ops for vectors
177 // with > 4 elements.
178 for (MVT VT : {MVT::v8i32, MVT::v8f32, MVT::v16i32, MVT::v16f32}) {
179 for (unsigned Op = 0; Op < ISD::BUILTIN_OP_END; ++Op) {
183 case ISD::BUILD_VECTOR:
185 case ISD::EXTRACT_VECTOR_ELT:
186 case ISD::INSERT_VECTOR_ELT:
187 case ISD::INSERT_SUBVECTOR:
188 case ISD::EXTRACT_SUBVECTOR:
190 case ISD::CONCAT_VECTORS:
191 setOperationAction(Op, VT, Custom);
194 setOperationAction(Op, VT, Expand);
200 if (Subtarget->getGeneration() >= AMDGPUSubtarget::SEA_ISLANDS) {
201 setOperationAction(ISD::FTRUNC, MVT::f64, Legal);
202 setOperationAction(ISD::FCEIL, MVT::f64, Legal);
203 setOperationAction(ISD::FRINT, MVT::f64, Legal);
206 setOperationAction(ISD::FFLOOR, MVT::f64, Legal);
207 setOperationAction(ISD::FDIV, MVT::f32, Custom);
208 setOperationAction(ISD::FDIV, MVT::f64, Custom);
210 setTargetDAGCombine(ISD::FADD);
211 setTargetDAGCombine(ISD::FSUB);
212 setTargetDAGCombine(ISD::FMINNUM);
213 setTargetDAGCombine(ISD::FMAXNUM);
214 setTargetDAGCombine(ISD::SMIN);
215 setTargetDAGCombine(ISD::SMAX);
216 setTargetDAGCombine(ISD::UMIN);
217 setTargetDAGCombine(ISD::UMAX);
218 setTargetDAGCombine(ISD::SELECT_CC);
219 setTargetDAGCombine(ISD::SETCC);
220 setTargetDAGCombine(ISD::AND);
221 setTargetDAGCombine(ISD::OR);
222 setTargetDAGCombine(ISD::UINT_TO_FP);
224 // All memory operations. Some folding on the pointer operand is done to help
225 // matching the constant offsets in the addressing modes.
226 setTargetDAGCombine(ISD::LOAD);
227 setTargetDAGCombine(ISD::STORE);
228 setTargetDAGCombine(ISD::ATOMIC_LOAD);
229 setTargetDAGCombine(ISD::ATOMIC_STORE);
230 setTargetDAGCombine(ISD::ATOMIC_CMP_SWAP);
231 setTargetDAGCombine(ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS);
232 setTargetDAGCombine(ISD::ATOMIC_SWAP);
233 setTargetDAGCombine(ISD::ATOMIC_LOAD_ADD);
234 setTargetDAGCombine(ISD::ATOMIC_LOAD_SUB);
235 setTargetDAGCombine(ISD::ATOMIC_LOAD_AND);
236 setTargetDAGCombine(ISD::ATOMIC_LOAD_OR);
237 setTargetDAGCombine(ISD::ATOMIC_LOAD_XOR);
238 setTargetDAGCombine(ISD::ATOMIC_LOAD_NAND);
239 setTargetDAGCombine(ISD::ATOMIC_LOAD_MIN);
240 setTargetDAGCombine(ISD::ATOMIC_LOAD_MAX);
241 setTargetDAGCombine(ISD::ATOMIC_LOAD_UMIN);
242 setTargetDAGCombine(ISD::ATOMIC_LOAD_UMAX);
244 setSchedulingPreference(Sched::RegPressure);
247 //===----------------------------------------------------------------------===//
248 // TargetLowering queries
249 //===----------------------------------------------------------------------===//
251 bool SITargetLowering::isShuffleMaskLegal(const SmallVectorImpl<int> &,
253 // SI has some legal vector types, but no legal vector operations. Say no
254 // shuffles are legal in order to prefer scalarizing some vector operations.
258 bool SITargetLowering::isLegalFlatAddressingMode(const AddrMode &AM) const {
259 // Flat instructions do not have offsets, and only have the register
261 return AM.BaseOffs == 0 && (AM.Scale == 0 || AM.Scale == 1);
264 bool SITargetLowering::isLegalMUBUFAddressingMode(const AddrMode &AM) const {
265 // MUBUF / MTBUF instructions have a 12-bit unsigned byte offset, and
266 // additionally can do r + r + i with addr64. 32-bit has more addressing
267 // mode options. Depending on the resource constant, it can also do
268 // (i64 r0) + (i32 r1) * (i14 i).
270 // Private arrays end up using a scratch buffer most of the time, so also
271 // assume those use MUBUF instructions. Scratch loads / stores are currently
272 // implemented as mubuf instructions with offen bit set, so slightly
273 // different than the normal addr64.
274 if (!isUInt<12>(AM.BaseOffs))
277 // FIXME: Since we can split immediate into soffset and immediate offset,
278 // would it make sense to allow any immediate?
281 case 0: // r + i or just i, depending on HasBaseReg.
284 return true; // We have r + r or r + i.
291 // Allow 2 * r as r + r
292 // Or 2 * r + i is allowed as r + r + i.
294 default: // Don't allow n * r
299 bool SITargetLowering::isLegalAddressingMode(const DataLayout &DL,
300 const AddrMode &AM, Type *Ty,
302 // No global is ever allowed as a base.
307 case AMDGPUAS::GLOBAL_ADDRESS: {
308 if (Subtarget->getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS) {
309 // Assume the we will use FLAT for all global memory accesses
311 // FIXME: This assumption is currently wrong. On VI we still use
312 // MUBUF instructions for the r + i addressing mode. As currently
313 // implemented, the MUBUF instructions only work on buffer < 4GB.
314 // It may be possible to support > 4GB buffers with MUBUF instructions,
315 // by setting the stride value in the resource descriptor which would
316 // increase the size limit to (stride * 4GB). However, this is risky,
317 // because it has never been validated.
318 return isLegalFlatAddressingMode(AM);
321 return isLegalMUBUFAddressingMode(AM);
323 case AMDGPUAS::CONSTANT_ADDRESS: {
324 // If the offset isn't a multiple of 4, it probably isn't going to be
325 // correctly aligned.
326 if (AM.BaseOffs % 4 != 0)
327 return isLegalMUBUFAddressingMode(AM);
329 // There are no SMRD extloads, so if we have to do a small type access we
330 // will use a MUBUF load.
331 // FIXME?: We also need to do this if unaligned, but we don't know the
333 if (DL.getTypeStoreSize(Ty) < 4)
334 return isLegalMUBUFAddressingMode(AM);
336 if (Subtarget->getGeneration() == AMDGPUSubtarget::SOUTHERN_ISLANDS) {
337 // SMRD instructions have an 8-bit, dword offset on SI.
338 if (!isUInt<8>(AM.BaseOffs / 4))
340 } else if (Subtarget->getGeneration() == AMDGPUSubtarget::SEA_ISLANDS) {
341 // On CI+, this can also be a 32-bit literal constant offset. If it fits
342 // in 8-bits, it can use a smaller encoding.
343 if (!isUInt<32>(AM.BaseOffs / 4))
345 } else if (Subtarget->getGeneration() == AMDGPUSubtarget::VOLCANIC_ISLANDS) {
346 // On VI, these use the SMEM format and the offset is 20-bit in bytes.
347 if (!isUInt<20>(AM.BaseOffs))
350 llvm_unreachable("unhandled generation");
352 if (AM.Scale == 0) // r + i or just i, depending on HasBaseReg.
355 if (AM.Scale == 1 && AM.HasBaseReg)
361 case AMDGPUAS::PRIVATE_ADDRESS:
362 case AMDGPUAS::UNKNOWN_ADDRESS_SPACE:
363 return isLegalMUBUFAddressingMode(AM);
365 case AMDGPUAS::LOCAL_ADDRESS:
366 case AMDGPUAS::REGION_ADDRESS: {
367 // Basic, single offset DS instructions allow a 16-bit unsigned immediate
369 // XXX - If doing a 4-byte aligned 8-byte type access, we effectively have
370 // an 8-bit dword offset but we don't know the alignment here.
371 if (!isUInt<16>(AM.BaseOffs))
374 if (AM.Scale == 0) // r + i or just i, depending on HasBaseReg.
377 if (AM.Scale == 1 && AM.HasBaseReg)
382 case AMDGPUAS::FLAT_ADDRESS:
383 return isLegalFlatAddressingMode(AM);
386 llvm_unreachable("unhandled address space");
390 bool SITargetLowering::allowsMisalignedMemoryAccesses(EVT VT,
393 bool *IsFast) const {
397 // TODO: I think v3i32 should allow unaligned accesses on CI with DS_READ_B96,
398 // which isn't a simple VT.
399 if (!VT.isSimple() || VT == MVT::Other)
402 // TODO - CI+ supports unaligned memory accesses, but this requires driver
405 // XXX - The only mention I see of this in the ISA manual is for LDS direct
406 // reads the "byte address and must be dword aligned". Is it also true for the
407 // normal loads and stores?
408 if (AddrSpace == AMDGPUAS::LOCAL_ADDRESS) {
409 // ds_read/write_b64 require 8-byte alignment, but we can do a 4 byte
410 // aligned, 8 byte access in a single operation using ds_read2/write2_b32
411 // with adjacent offsets.
412 bool AlignedBy4 = (Align % 4 == 0);
414 *IsFast = AlignedBy4;
418 // Smaller than dword value must be aligned.
419 // FIXME: This should be allowed on CI+
420 if (VT.bitsLT(MVT::i32))
423 // 8.1.6 - For Dword or larger reads or writes, the two LSBs of the
424 // byte-address are ignored, thus forcing Dword alignment.
425 // This applies to private, global, and constant memory.
429 return VT.bitsGT(MVT::i32) && Align % 4 == 0;
432 EVT SITargetLowering::getOptimalMemOpType(uint64_t Size, unsigned DstAlign,
433 unsigned SrcAlign, bool IsMemset,
436 MachineFunction &MF) const {
437 // FIXME: Should account for address space here.
439 // The default fallback uses the private pointer size as a guess for a type to
440 // use. Make sure we switch these to 64-bit accesses.
442 if (Size >= 16 && DstAlign >= 4) // XXX: Should only do for global
445 if (Size >= 8 && DstAlign >= 4)
452 TargetLoweringBase::LegalizeTypeAction
453 SITargetLowering::getPreferredVectorAction(EVT VT) const {
454 if (VT.getVectorNumElements() != 1 && VT.getScalarType().bitsLE(MVT::i16))
455 return TypeSplitVector;
457 return TargetLoweringBase::getPreferredVectorAction(VT);
460 bool SITargetLowering::shouldConvertConstantLoadToIntImm(const APInt &Imm,
462 const SIInstrInfo *TII =
463 static_cast<const SIInstrInfo *>(Subtarget->getInstrInfo());
464 return TII->isInlineConstant(Imm);
467 SDValue SITargetLowering::LowerParameter(SelectionDAG &DAG, EVT VT, EVT MemVT,
468 SDLoc SL, SDValue Chain,
469 unsigned Offset, bool Signed) const {
470 const DataLayout &DL = DAG.getDataLayout();
471 MachineFunction &MF = DAG.getMachineFunction();
472 const SIRegisterInfo *TRI =
473 static_cast<const SIRegisterInfo*>(Subtarget->getRegisterInfo());
474 unsigned InputPtrReg = TRI->getPreloadedValue(MF, SIRegisterInfo::INPUT_PTR);
476 Type *Ty = VT.getTypeForEVT(*DAG.getContext());
478 MachineRegisterInfo &MRI = DAG.getMachineFunction().getRegInfo();
479 MVT PtrVT = getPointerTy(DL, AMDGPUAS::CONSTANT_ADDRESS);
480 PointerType *PtrTy = PointerType::get(Ty, AMDGPUAS::CONSTANT_ADDRESS);
481 SDValue BasePtr = DAG.getCopyFromReg(Chain, SL,
482 MRI.getLiveInVirtReg(InputPtrReg), PtrVT);
483 SDValue Ptr = DAG.getNode(ISD::ADD, SL, PtrVT, BasePtr,
484 DAG.getConstant(Offset, SL, PtrVT));
485 SDValue PtrOffset = DAG.getUNDEF(PtrVT);
486 MachinePointerInfo PtrInfo(UndefValue::get(PtrTy));
488 unsigned Align = DL.getABITypeAlignment(Ty);
490 ISD::LoadExtType ExtTy = Signed ? ISD::SEXTLOAD : ISD::ZEXTLOAD;
491 if (MemVT.isFloatingPoint())
492 ExtTy = ISD::EXTLOAD;
494 return DAG.getLoad(ISD::UNINDEXED, ExtTy,
495 VT, SL, Chain, Ptr, PtrOffset, PtrInfo, MemVT,
497 true, // isNonTemporal
502 SDValue SITargetLowering::LowerFormalArguments(
503 SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
504 const SmallVectorImpl<ISD::InputArg> &Ins, SDLoc DL, SelectionDAG &DAG,
505 SmallVectorImpl<SDValue> &InVals) const {
506 const SIRegisterInfo *TRI =
507 static_cast<const SIRegisterInfo *>(Subtarget->getRegisterInfo());
509 MachineFunction &MF = DAG.getMachineFunction();
510 FunctionType *FType = MF.getFunction()->getFunctionType();
511 SIMachineFunctionInfo *Info = MF.getInfo<SIMachineFunctionInfo>();
513 // FIXME: We currently assume all calling conventions are kernels.
515 SmallVector<ISD::InputArg, 16> Splits;
516 BitVector Skipped(Ins.size());
518 for (unsigned i = 0, e = Ins.size(), PSInputNum = 0; i != e; ++i) {
519 const ISD::InputArg &Arg = Ins[i];
521 // First check if it's a PS input addr
522 if (Info->getShaderType() == ShaderType::PIXEL && !Arg.Flags.isInReg() &&
523 !Arg.Flags.isByVal()) {
525 assert((PSInputNum <= 15) && "Too many PS inputs!");
528 // We can safely skip PS inputs
534 Info->PSInputAddr |= 1 << PSInputNum++;
537 // Second split vertices into their elements
538 if (Info->getShaderType() != ShaderType::COMPUTE && Arg.VT.isVector()) {
539 ISD::InputArg NewArg = Arg;
540 NewArg.Flags.setSplit();
541 NewArg.VT = Arg.VT.getVectorElementType();
543 // We REALLY want the ORIGINAL number of vertex elements here, e.g. a
544 // three or five element vertex only needs three or five registers,
545 // NOT four or eight.
546 Type *ParamType = FType->getParamType(Arg.getOrigArgIndex());
547 unsigned NumElements = ParamType->getVectorNumElements();
549 for (unsigned j = 0; j != NumElements; ++j) {
550 Splits.push_back(NewArg);
551 NewArg.PartOffset += NewArg.VT.getStoreSize();
554 } else if (Info->getShaderType() != ShaderType::COMPUTE) {
555 Splits.push_back(Arg);
559 SmallVector<CCValAssign, 16> ArgLocs;
560 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), ArgLocs,
563 // At least one interpolation mode must be enabled or else the GPU will hang.
564 if (Info->getShaderType() == ShaderType::PIXEL &&
565 (Info->PSInputAddr & 0x7F) == 0) {
566 Info->PSInputAddr |= 1;
567 CCInfo.AllocateReg(AMDGPU::VGPR0);
568 CCInfo.AllocateReg(AMDGPU::VGPR1);
571 // The pointer to the list of arguments is stored in SGPR0, SGPR1
572 // The pointer to the scratch buffer is stored in SGPR2, SGPR3
573 if (Info->getShaderType() == ShaderType::COMPUTE) {
574 if (Subtarget->isAmdHsaOS())
575 Info->NumUserSGPRs = 2; // FIXME: Need to support scratch buffers.
577 Info->NumUserSGPRs = 4;
579 unsigned InputPtrReg =
580 TRI->getPreloadedValue(MF, SIRegisterInfo::INPUT_PTR);
581 unsigned InputPtrRegLo =
582 TRI->getPhysRegSubReg(InputPtrReg, &AMDGPU::SReg_32RegClass, 0);
583 unsigned InputPtrRegHi =
584 TRI->getPhysRegSubReg(InputPtrReg, &AMDGPU::SReg_32RegClass, 1);
586 unsigned ScratchPtrReg =
587 TRI->getPreloadedValue(MF, SIRegisterInfo::SCRATCH_PTR);
588 unsigned ScratchPtrRegLo =
589 TRI->getPhysRegSubReg(ScratchPtrReg, &AMDGPU::SReg_32RegClass, 0);
590 unsigned ScratchPtrRegHi =
591 TRI->getPhysRegSubReg(ScratchPtrReg, &AMDGPU::SReg_32RegClass, 1);
593 CCInfo.AllocateReg(InputPtrRegLo);
594 CCInfo.AllocateReg(InputPtrRegHi);
595 CCInfo.AllocateReg(ScratchPtrRegLo);
596 CCInfo.AllocateReg(ScratchPtrRegHi);
597 MF.addLiveIn(InputPtrReg, &AMDGPU::SReg_64RegClass);
598 MF.addLiveIn(ScratchPtrReg, &AMDGPU::SReg_64RegClass);
601 if (Info->getShaderType() == ShaderType::COMPUTE) {
602 getOriginalFunctionArgs(DAG, DAG.getMachineFunction().getFunction(), Ins,
606 AnalyzeFormalArguments(CCInfo, Splits);
608 SmallVector<SDValue, 16> Chains;
610 for (unsigned i = 0, e = Ins.size(), ArgIdx = 0; i != e; ++i) {
612 const ISD::InputArg &Arg = Ins[i];
614 InVals.push_back(DAG.getUNDEF(Arg.VT));
618 CCValAssign &VA = ArgLocs[ArgIdx++];
619 MVT VT = VA.getLocVT();
623 EVT MemVT = Splits[i].VT;
624 const unsigned Offset = Subtarget->getExplicitKernelArgOffset() +
625 VA.getLocMemOffset();
626 // The first 36 bytes of the input buffer contains information about
627 // thread group and global sizes.
628 SDValue Arg = LowerParameter(DAG, VT, MemVT, DL, Chain,
629 Offset, Ins[i].Flags.isSExt());
630 Chains.push_back(Arg.getValue(1));
633 dyn_cast<PointerType>(FType->getParamType(Ins[i].getOrigArgIndex()));
634 if (Subtarget->getGeneration() == AMDGPUSubtarget::SOUTHERN_ISLANDS &&
635 ParamTy && ParamTy->getAddressSpace() == AMDGPUAS::LOCAL_ADDRESS) {
636 // On SI local pointers are just offsets into LDS, so they are always
637 // less than 16-bits. On CI and newer they could potentially be
638 // real pointers, so we can't guarantee their size.
639 Arg = DAG.getNode(ISD::AssertZext, DL, Arg.getValueType(), Arg,
640 DAG.getValueType(MVT::i16));
643 InVals.push_back(Arg);
644 Info->ABIArgOffset = Offset + MemVT.getStoreSize();
647 assert(VA.isRegLoc() && "Parameter must be in a register!");
649 unsigned Reg = VA.getLocReg();
651 if (VT == MVT::i64) {
652 // For now assume it is a pointer
653 Reg = TRI->getMatchingSuperReg(Reg, AMDGPU::sub0,
654 &AMDGPU::SReg_64RegClass);
655 Reg = MF.addLiveIn(Reg, &AMDGPU::SReg_64RegClass);
656 SDValue Copy = DAG.getCopyFromReg(Chain, DL, Reg, VT);
657 InVals.push_back(Copy);
661 const TargetRegisterClass *RC = TRI->getMinimalPhysRegClass(Reg, VT);
663 Reg = MF.addLiveIn(Reg, RC);
664 SDValue Val = DAG.getCopyFromReg(Chain, DL, Reg, VT);
666 if (Arg.VT.isVector()) {
668 // Build a vector from the registers
669 Type *ParamType = FType->getParamType(Arg.getOrigArgIndex());
670 unsigned NumElements = ParamType->getVectorNumElements();
672 SmallVector<SDValue, 4> Regs;
674 for (unsigned j = 1; j != NumElements; ++j) {
675 Reg = ArgLocs[ArgIdx++].getLocReg();
676 Reg = MF.addLiveIn(Reg, RC);
678 SDValue Copy = DAG.getCopyFromReg(Chain, DL, Reg, VT);
679 Regs.push_back(Copy);
682 // Fill up the missing vector elements
683 NumElements = Arg.VT.getVectorNumElements() - NumElements;
684 Regs.append(NumElements, DAG.getUNDEF(VT));
686 InVals.push_back(DAG.getNode(ISD::BUILD_VECTOR, DL, Arg.VT, Regs));
690 InVals.push_back(Val);
693 if (Info->getShaderType() != ShaderType::COMPUTE) {
694 unsigned ScratchIdx = CCInfo.getFirstUnallocated(makeArrayRef(
695 AMDGPU::SGPR_32RegClass.begin(), AMDGPU::SGPR_32RegClass.getNumRegs()));
696 Info->ScratchOffsetReg = AMDGPU::SGPR_32RegClass.getRegister(ScratchIdx);
702 return DAG.getNode(ISD::TokenFactor, DL, MVT::Other, Chains);
705 MachineBasicBlock * SITargetLowering::EmitInstrWithCustomInserter(
706 MachineInstr * MI, MachineBasicBlock * BB) const {
708 MachineBasicBlock::iterator I = *MI;
709 const SIInstrInfo *TII =
710 static_cast<const SIInstrInfo *>(Subtarget->getInstrInfo());
712 switch (MI->getOpcode()) {
714 return AMDGPUTargetLowering::EmitInstrWithCustomInserter(MI, BB);
717 case AMDGPU::SI_RegisterStorePseudo: {
718 MachineRegisterInfo &MRI = BB->getParent()->getRegInfo();
719 unsigned Reg = MRI.createVirtualRegister(&AMDGPU::SReg_64RegClass);
720 MachineInstrBuilder MIB =
721 BuildMI(*BB, I, MI->getDebugLoc(), TII->get(AMDGPU::SI_RegisterStore),
723 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i)
724 MIB.addOperand(MI->getOperand(i));
726 MI->eraseFromParent();
733 bool SITargetLowering::enableAggressiveFMAFusion(EVT VT) const {
734 // This currently forces unfolding various combinations of fsub into fma with
735 // free fneg'd operands. As long as we have fast FMA (controlled by
736 // isFMAFasterThanFMulAndFAdd), we should perform these.
738 // When fma is quarter rate, for f64 where add / sub are at best half rate,
739 // most of these combines appear to be cycle neutral but save on instruction
740 // count / code size.
744 EVT SITargetLowering::getSetCCResultType(const DataLayout &DL, LLVMContext &Ctx,
746 if (!VT.isVector()) {
749 return EVT::getVectorVT(Ctx, MVT::i1, VT.getVectorNumElements());
752 MVT SITargetLowering::getScalarShiftAmountTy(const DataLayout &, EVT) const {
756 // Answering this is somewhat tricky and depends on the specific device which
757 // have different rates for fma or all f64 operations.
759 // v_fma_f64 and v_mul_f64 always take the same number of cycles as each other
760 // regardless of which device (although the number of cycles differs between
761 // devices), so it is always profitable for f64.
763 // v_fma_f32 takes 4 or 16 cycles depending on the device, so it is profitable
764 // only on full rate devices. Normally, we should prefer selecting v_mad_f32
765 // which we can always do even without fused FP ops since it returns the same
766 // result as the separate operations and since it is always full
767 // rate. Therefore, we lie and report that it is not faster for f32. v_mad_f32
768 // however does not support denormals, so we do report fma as faster if we have
769 // a fast fma device and require denormals.
771 bool SITargetLowering::isFMAFasterThanFMulAndFAdd(EVT VT) const {
772 VT = VT.getScalarType();
777 switch (VT.getSimpleVT().SimpleTy) {
779 // This is as fast on some subtargets. However, we always have full rate f32
780 // mad available which returns the same result as the separate operations
781 // which we should prefer over fma. We can't use this if we want to support
782 // denormals, so only report this in these cases.
783 return Subtarget->hasFP32Denormals() && Subtarget->hasFastFMAF32();
793 //===----------------------------------------------------------------------===//
794 // Custom DAG Lowering Operations
795 //===----------------------------------------------------------------------===//
797 SDValue SITargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const {
798 switch (Op.getOpcode()) {
799 default: return AMDGPUTargetLowering::LowerOperation(Op, DAG);
800 case ISD::FrameIndex: return LowerFrameIndex(Op, DAG);
801 case ISD::BRCOND: return LowerBRCOND(Op, DAG);
803 SDValue Result = LowerLOAD(Op, DAG);
804 assert((!Result.getNode() ||
805 Result.getNode()->getNumValues() == 2) &&
806 "Load should return a value and a chain");
812 return LowerTrig(Op, DAG);
813 case ISD::SELECT: return LowerSELECT(Op, DAG);
814 case ISD::FDIV: return LowerFDIV(Op, DAG);
815 case ISD::STORE: return LowerSTORE(Op, DAG);
816 case ISD::GlobalAddress: {
817 MachineFunction &MF = DAG.getMachineFunction();
818 SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();
819 return LowerGlobalAddress(MFI, Op, DAG);
821 case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG);
822 case ISD::INTRINSIC_VOID: return LowerINTRINSIC_VOID(Op, DAG);
827 /// \brief Helper function for LowerBRCOND
828 static SDNode *findUser(SDValue Value, unsigned Opcode) {
830 SDNode *Parent = Value.getNode();
831 for (SDNode::use_iterator I = Parent->use_begin(), E = Parent->use_end();
834 if (I.getUse().get() != Value)
837 if (I->getOpcode() == Opcode)
843 SDValue SITargetLowering::LowerFrameIndex(SDValue Op, SelectionDAG &DAG) const {
846 FrameIndexSDNode *FINode = cast<FrameIndexSDNode>(Op);
847 unsigned FrameIndex = FINode->getIndex();
849 // A FrameIndex node represents a 32-bit offset into scratch memory. If
850 // the high bit of a frame index offset were to be set, this would mean
851 // that it represented an offset of ~2GB * 64 = ~128GB from the start of the
852 // scratch buffer, with 64 being the number of threads per wave.
854 // If we know the machine uses less than 128GB of scratch, then we can
855 // amrk the high bit of the FrameIndex node as known zero,
856 // which is important, because it means in most situations we can
857 // prove that values derived from FrameIndex nodes are non-negative.
858 // This enables us to take advantage of more addressing modes when
859 // accessing scratch buffers, since for scratch reads/writes, the register
860 // offset must always be positive.
862 SDValue TFI = DAG.getTargetFrameIndex(FrameIndex, MVT::i32);
863 if (Subtarget->enableHugeScratchBuffer())
866 return DAG.getNode(ISD::AssertZext, SL, MVT::i32, TFI,
867 DAG.getValueType(EVT::getIntegerVT(*DAG.getContext(), 31)));
870 /// This transforms the control flow intrinsics to get the branch destination as
871 /// last parameter, also switches branch target with BR if the need arise
872 SDValue SITargetLowering::LowerBRCOND(SDValue BRCOND,
873 SelectionDAG &DAG) const {
877 SDNode *Intr = BRCOND.getOperand(1).getNode();
878 SDValue Target = BRCOND.getOperand(2);
879 SDNode *BR = nullptr;
881 if (Intr->getOpcode() == ISD::SETCC) {
882 // As long as we negate the condition everything is fine
883 SDNode *SetCC = Intr;
884 assert(SetCC->getConstantOperandVal(1) == 1);
885 assert(cast<CondCodeSDNode>(SetCC->getOperand(2).getNode())->get() ==
887 Intr = SetCC->getOperand(0).getNode();
890 // Get the target from BR if we don't negate the condition
891 BR = findUser(BRCOND, ISD::BR);
892 Target = BR->getOperand(1);
895 assert(Intr->getOpcode() == ISD::INTRINSIC_W_CHAIN);
897 // Build the result and
898 ArrayRef<EVT> Res(Intr->value_begin() + 1, Intr->value_end());
900 // operands of the new intrinsic call
901 SmallVector<SDValue, 4> Ops;
902 Ops.push_back(BRCOND.getOperand(0));
903 Ops.append(Intr->op_begin() + 1, Intr->op_end());
904 Ops.push_back(Target);
906 // build the new intrinsic call
907 SDNode *Result = DAG.getNode(
908 Res.size() > 1 ? ISD::INTRINSIC_W_CHAIN : ISD::INTRINSIC_VOID, DL,
909 DAG.getVTList(Res), Ops).getNode();
912 // Give the branch instruction our target
917 SDValue NewBR = DAG.getNode(ISD::BR, DL, BR->getVTList(), Ops);
918 DAG.ReplaceAllUsesWith(BR, NewBR.getNode());
919 BR = NewBR.getNode();
922 SDValue Chain = SDValue(Result, Result->getNumValues() - 1);
924 // Copy the intrinsic results to registers
925 for (unsigned i = 1, e = Intr->getNumValues() - 1; i != e; ++i) {
926 SDNode *CopyToReg = findUser(SDValue(Intr, i), ISD::CopyToReg);
930 Chain = DAG.getCopyToReg(
932 CopyToReg->getOperand(1),
933 SDValue(Result, i - 1),
936 DAG.ReplaceAllUsesWith(SDValue(CopyToReg, 0), CopyToReg->getOperand(0));
939 // Remove the old intrinsic from the chain
940 DAG.ReplaceAllUsesOfValueWith(
941 SDValue(Intr, Intr->getNumValues() - 1),
942 Intr->getOperand(0));
947 SDValue SITargetLowering::LowerGlobalAddress(AMDGPUMachineFunction *MFI,
949 SelectionDAG &DAG) const {
950 GlobalAddressSDNode *GSD = cast<GlobalAddressSDNode>(Op);
952 if (GSD->getAddressSpace() != AMDGPUAS::CONSTANT_ADDRESS)
953 return AMDGPUTargetLowering::LowerGlobalAddress(MFI, Op, DAG);
956 const GlobalValue *GV = GSD->getGlobal();
957 MVT PtrVT = getPointerTy(DAG.getDataLayout(), GSD->getAddressSpace());
959 SDValue Ptr = DAG.getNode(AMDGPUISD::CONST_DATA_PTR, DL, PtrVT);
960 SDValue GA = DAG.getTargetGlobalAddress(GV, DL, MVT::i32);
962 SDValue PtrLo = DAG.getNode(ISD::EXTRACT_ELEMENT, DL, MVT::i32, Ptr,
963 DAG.getConstant(0, DL, MVT::i32));
964 SDValue PtrHi = DAG.getNode(ISD::EXTRACT_ELEMENT, DL, MVT::i32, Ptr,
965 DAG.getConstant(1, DL, MVT::i32));
967 SDValue Lo = DAG.getNode(ISD::ADDC, DL, DAG.getVTList(MVT::i32, MVT::Glue),
969 SDValue Hi = DAG.getNode(ISD::ADDE, DL, DAG.getVTList(MVT::i32, MVT::Glue),
970 PtrHi, DAG.getConstant(0, DL, MVT::i32),
971 SDValue(Lo.getNode(), 1));
972 return DAG.getNode(ISD::BUILD_PAIR, DL, MVT::i64, Lo, Hi);
975 SDValue SITargetLowering::copyToM0(SelectionDAG &DAG, SDValue Chain, SDLoc DL,
977 // We can't use CopyToReg, because MachineCSE won't combine COPY instructions,
978 // so we will end up with redundant moves to m0.
980 // We can't use S_MOV_B32, because there is no way to specify m0 as the
981 // destination register.
983 // We have to use them both. Machine cse will combine all the S_MOV_B32
984 // instructions and the register coalescer eliminate the extra copies.
985 SDNode *M0 = DAG.getMachineNode(AMDGPU::S_MOV_B32, DL, V.getValueType(), V);
986 return DAG.getCopyToReg(Chain, DL, DAG.getRegister(AMDGPU::M0, MVT::i32),
987 SDValue(M0, 0), SDValue()); // Glue
988 // A Null SDValue creates
992 SDValue SITargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op,
993 SelectionDAG &DAG) const {
994 MachineFunction &MF = DAG.getMachineFunction();
995 auto MFI = MF.getInfo<SIMachineFunctionInfo>();
996 const SIRegisterInfo *TRI =
997 static_cast<const SIRegisterInfo *>(Subtarget->getRegisterInfo());
999 EVT VT = Op.getValueType();
1001 unsigned IntrinsicID = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
1003 // TODO: Should this propagate fast-math-flags?
1005 switch (IntrinsicID) {
1006 case Intrinsic::r600_read_ngroups_x:
1007 return LowerParameter(DAG, VT, VT, DL, DAG.getEntryNode(),
1008 SI::KernelInputOffsets::NGROUPS_X, false);
1009 case Intrinsic::r600_read_ngroups_y:
1010 return LowerParameter(DAG, VT, VT, DL, DAG.getEntryNode(),
1011 SI::KernelInputOffsets::NGROUPS_Y, false);
1012 case Intrinsic::r600_read_ngroups_z:
1013 return LowerParameter(DAG, VT, VT, DL, DAG.getEntryNode(),
1014 SI::KernelInputOffsets::NGROUPS_Z, false);
1015 case Intrinsic::r600_read_global_size_x:
1016 return LowerParameter(DAG, VT, VT, DL, DAG.getEntryNode(),
1017 SI::KernelInputOffsets::GLOBAL_SIZE_X, false);
1018 case Intrinsic::r600_read_global_size_y:
1019 return LowerParameter(DAG, VT, VT, DL, DAG.getEntryNode(),
1020 SI::KernelInputOffsets::GLOBAL_SIZE_Y, false);
1021 case Intrinsic::r600_read_global_size_z:
1022 return LowerParameter(DAG, VT, VT, DL, DAG.getEntryNode(),
1023 SI::KernelInputOffsets::GLOBAL_SIZE_Z, false);
1024 case Intrinsic::r600_read_local_size_x:
1025 return LowerParameter(DAG, VT, VT, DL, DAG.getEntryNode(),
1026 SI::KernelInputOffsets::LOCAL_SIZE_X, false);
1027 case Intrinsic::r600_read_local_size_y:
1028 return LowerParameter(DAG, VT, VT, DL, DAG.getEntryNode(),
1029 SI::KernelInputOffsets::LOCAL_SIZE_Y, false);
1030 case Intrinsic::r600_read_local_size_z:
1031 return LowerParameter(DAG, VT, VT, DL, DAG.getEntryNode(),
1032 SI::KernelInputOffsets::LOCAL_SIZE_Z, false);
1034 case Intrinsic::AMDGPU_read_workdim:
1035 return LowerParameter(DAG, VT, VT, DL, DAG.getEntryNode(),
1036 getImplicitParameterOffset(MFI, GRID_DIM), false);
1038 case Intrinsic::r600_read_tgid_x:
1039 return CreateLiveInRegister(DAG, &AMDGPU::SReg_32RegClass,
1040 TRI->getPreloadedValue(MF, SIRegisterInfo::TGID_X), VT);
1041 case Intrinsic::r600_read_tgid_y:
1042 return CreateLiveInRegister(DAG, &AMDGPU::SReg_32RegClass,
1043 TRI->getPreloadedValue(MF, SIRegisterInfo::TGID_Y), VT);
1044 case Intrinsic::r600_read_tgid_z:
1045 return CreateLiveInRegister(DAG, &AMDGPU::SReg_32RegClass,
1046 TRI->getPreloadedValue(MF, SIRegisterInfo::TGID_Z), VT);
1047 case Intrinsic::r600_read_tidig_x:
1048 return CreateLiveInRegister(DAG, &AMDGPU::VGPR_32RegClass,
1049 TRI->getPreloadedValue(MF, SIRegisterInfo::TIDIG_X), VT);
1050 case Intrinsic::r600_read_tidig_y:
1051 return CreateLiveInRegister(DAG, &AMDGPU::VGPR_32RegClass,
1052 TRI->getPreloadedValue(MF, SIRegisterInfo::TIDIG_Y), VT);
1053 case Intrinsic::r600_read_tidig_z:
1054 return CreateLiveInRegister(DAG, &AMDGPU::VGPR_32RegClass,
1055 TRI->getPreloadedValue(MF, SIRegisterInfo::TIDIG_Z), VT);
1056 case AMDGPUIntrinsic::SI_load_const: {
1062 MachineMemOperand *MMO = MF.getMachineMemOperand(
1063 MachinePointerInfo(),
1064 MachineMemOperand::MOLoad | MachineMemOperand::MOInvariant,
1065 VT.getStoreSize(), 4);
1066 return DAG.getMemIntrinsicNode(AMDGPUISD::LOAD_CONSTANT, DL,
1067 Op->getVTList(), Ops, VT, MMO);
1069 case AMDGPUIntrinsic::SI_sample:
1070 return LowerSampleIntrinsic(AMDGPUISD::SAMPLE, Op, DAG);
1071 case AMDGPUIntrinsic::SI_sampleb:
1072 return LowerSampleIntrinsic(AMDGPUISD::SAMPLEB, Op, DAG);
1073 case AMDGPUIntrinsic::SI_sampled:
1074 return LowerSampleIntrinsic(AMDGPUISD::SAMPLED, Op, DAG);
1075 case AMDGPUIntrinsic::SI_samplel:
1076 return LowerSampleIntrinsic(AMDGPUISD::SAMPLEL, Op, DAG);
1077 case AMDGPUIntrinsic::SI_vs_load_input:
1078 return DAG.getNode(AMDGPUISD::LOAD_INPUT, DL, VT,
1083 case AMDGPUIntrinsic::AMDGPU_fract:
1084 case AMDGPUIntrinsic::AMDIL_fraction: // Legacy name.
1085 return DAG.getNode(ISD::FSUB, DL, VT, Op.getOperand(1),
1086 DAG.getNode(ISD::FFLOOR, DL, VT, Op.getOperand(1)));
1087 case AMDGPUIntrinsic::SI_fs_constant: {
1088 SDValue M0 = copyToM0(DAG, DAG.getEntryNode(), DL, Op.getOperand(3));
1089 SDValue Glue = M0.getValue(1);
1090 return DAG.getNode(AMDGPUISD::INTERP_MOV, DL, MVT::f32,
1091 DAG.getConstant(2, DL, MVT::i32), // P0
1092 Op.getOperand(1), Op.getOperand(2), Glue);
1094 case AMDGPUIntrinsic::SI_fs_interp: {
1095 SDValue IJ = Op.getOperand(4);
1096 SDValue I = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MVT::i32, IJ,
1097 DAG.getConstant(0, DL, MVT::i32));
1098 SDValue J = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MVT::i32, IJ,
1099 DAG.getConstant(1, DL, MVT::i32));
1100 SDValue M0 = copyToM0(DAG, DAG.getEntryNode(), DL, Op.getOperand(3));
1101 SDValue Glue = M0.getValue(1);
1102 SDValue P1 = DAG.getNode(AMDGPUISD::INTERP_P1, DL,
1103 DAG.getVTList(MVT::f32, MVT::Glue),
1104 I, Op.getOperand(1), Op.getOperand(2), Glue);
1105 Glue = SDValue(P1.getNode(), 1);
1106 return DAG.getNode(AMDGPUISD::INTERP_P2, DL, MVT::f32, P1, J,
1107 Op.getOperand(1), Op.getOperand(2), Glue);
1110 return AMDGPUTargetLowering::LowerOperation(Op, DAG);
1114 SDValue SITargetLowering::LowerINTRINSIC_VOID(SDValue Op,
1115 SelectionDAG &DAG) const {
1116 MachineFunction &MF = DAG.getMachineFunction();
1118 SDValue Chain = Op.getOperand(0);
1119 unsigned IntrinsicID = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
1121 switch (IntrinsicID) {
1122 case AMDGPUIntrinsic::SI_sendmsg: {
1123 Chain = copyToM0(DAG, Chain, DL, Op.getOperand(3));
1124 SDValue Glue = Chain.getValue(1);
1125 return DAG.getNode(AMDGPUISD::SENDMSG, DL, MVT::Other, Chain,
1126 Op.getOperand(2), Glue);
1128 case AMDGPUIntrinsic::SI_tbuffer_store: {
1146 EVT VT = Op.getOperand(3).getValueType();
1148 MachineMemOperand *MMO = MF.getMachineMemOperand(
1149 MachinePointerInfo(),
1150 MachineMemOperand::MOStore,
1151 VT.getStoreSize(), 4);
1152 return DAG.getMemIntrinsicNode(AMDGPUISD::TBUFFER_STORE_FORMAT, DL,
1153 Op->getVTList(), Ops, VT, MMO);
1160 SDValue SITargetLowering::LowerLOAD(SDValue Op, SelectionDAG &DAG) const {
1162 LoadSDNode *Load = cast<LoadSDNode>(Op);
1164 if (Op.getValueType().isVector()) {
1165 assert(Op.getValueType().getVectorElementType() == MVT::i32 &&
1166 "Custom lowering for non-i32 vectors hasn't been implemented.");
1167 unsigned NumElements = Op.getValueType().getVectorNumElements();
1168 assert(NumElements != 2 && "v2 loads are supported for all address spaces.");
1169 switch (Load->getAddressSpace()) {
1171 case AMDGPUAS::GLOBAL_ADDRESS:
1172 case AMDGPUAS::PRIVATE_ADDRESS:
1173 // v4 loads are supported for private and global memory.
1174 if (NumElements <= 4)
1177 case AMDGPUAS::LOCAL_ADDRESS:
1178 return ScalarizeVectorLoad(Op, DAG);
1182 return AMDGPUTargetLowering::LowerLOAD(Op, DAG);
1185 SDValue SITargetLowering::LowerSampleIntrinsic(unsigned Opcode,
1187 SelectionDAG &DAG) const {
1188 return DAG.getNode(Opcode, SDLoc(Op), Op.getValueType(), Op.getOperand(1),
1194 SDValue SITargetLowering::LowerSELECT(SDValue Op, SelectionDAG &DAG) const {
1195 if (Op.getValueType() != MVT::i64)
1199 SDValue Cond = Op.getOperand(0);
1201 SDValue Zero = DAG.getConstant(0, DL, MVT::i32);
1202 SDValue One = DAG.getConstant(1, DL, MVT::i32);
1204 SDValue LHS = DAG.getNode(ISD::BITCAST, DL, MVT::v2i32, Op.getOperand(1));
1205 SDValue RHS = DAG.getNode(ISD::BITCAST, DL, MVT::v2i32, Op.getOperand(2));
1207 SDValue Lo0 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MVT::i32, LHS, Zero);
1208 SDValue Lo1 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MVT::i32, RHS, Zero);
1210 SDValue Lo = DAG.getSelect(DL, MVT::i32, Cond, Lo0, Lo1);
1212 SDValue Hi0 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MVT::i32, LHS, One);
1213 SDValue Hi1 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MVT::i32, RHS, One);
1215 SDValue Hi = DAG.getSelect(DL, MVT::i32, Cond, Hi0, Hi1);
1217 SDValue Res = DAG.getNode(ISD::BUILD_VECTOR, DL, MVT::v2i32, Lo, Hi);
1218 return DAG.getNode(ISD::BITCAST, DL, MVT::i64, Res);
1221 // Catch division cases where we can use shortcuts with rcp and rsq
1223 SDValue SITargetLowering::LowerFastFDIV(SDValue Op, SelectionDAG &DAG) const {
1225 SDValue LHS = Op.getOperand(0);
1226 SDValue RHS = Op.getOperand(1);
1227 EVT VT = Op.getValueType();
1228 bool Unsafe = DAG.getTarget().Options.UnsafeFPMath;
1230 if (const ConstantFPSDNode *CLHS = dyn_cast<ConstantFPSDNode>(LHS)) {
1231 if ((Unsafe || (VT == MVT::f32 && !Subtarget->hasFP32Denormals())) &&
1232 CLHS->isExactlyValue(1.0)) {
1233 // v_rcp_f32 and v_rsq_f32 do not support denormals, and according to
1234 // the CI documentation has a worst case error of 1 ulp.
1235 // OpenCL requires <= 2.5 ulp for 1.0 / x, so it should always be OK to
1236 // use it as long as we aren't trying to use denormals.
1238 // 1.0 / sqrt(x) -> rsq(x)
1240 // XXX - Is UnsafeFPMath sufficient to do this for f64? The maximum ULP
1241 // error seems really high at 2^29 ULP.
1242 if (RHS.getOpcode() == ISD::FSQRT)
1243 return DAG.getNode(AMDGPUISD::RSQ, SL, VT, RHS.getOperand(0));
1245 // 1.0 / x -> rcp(x)
1246 return DAG.getNode(AMDGPUISD::RCP, SL, VT, RHS);
1251 // Turn into multiply by the reciprocal.
1252 // x / y -> x * (1.0 / y)
1254 Flags.setUnsafeAlgebra(true);
1255 SDValue Recip = DAG.getNode(AMDGPUISD::RCP, SL, VT, RHS);
1256 return DAG.getNode(ISD::FMUL, SL, VT, LHS, Recip, &Flags);
1262 SDValue SITargetLowering::LowerFDIV32(SDValue Op, SelectionDAG &DAG) const {
1263 SDValue FastLowered = LowerFastFDIV(Op, DAG);
1264 if (FastLowered.getNode())
1267 // This uses v_rcp_f32 which does not handle denormals. Let this hit a
1268 // selection error for now rather than do something incorrect.
1269 if (Subtarget->hasFP32Denormals())
1273 SDValue LHS = Op.getOperand(0);
1274 SDValue RHS = Op.getOperand(1);
1276 SDValue r1 = DAG.getNode(ISD::FABS, SL, MVT::f32, RHS);
1278 const APFloat K0Val(BitsToFloat(0x6f800000));
1279 const SDValue K0 = DAG.getConstantFP(K0Val, SL, MVT::f32);
1281 const APFloat K1Val(BitsToFloat(0x2f800000));
1282 const SDValue K1 = DAG.getConstantFP(K1Val, SL, MVT::f32);
1284 const SDValue One = DAG.getConstantFP(1.0, SL, MVT::f32);
1287 getSetCCResultType(DAG.getDataLayout(), *DAG.getContext(), MVT::f32);
1289 SDValue r2 = DAG.getSetCC(SL, SetCCVT, r1, K0, ISD::SETOGT);
1291 SDValue r3 = DAG.getNode(ISD::SELECT, SL, MVT::f32, r2, K1, One);
1293 // TODO: Should this propagate fast-math-flags?
1295 r1 = DAG.getNode(ISD::FMUL, SL, MVT::f32, RHS, r3);
1297 SDValue r0 = DAG.getNode(AMDGPUISD::RCP, SL, MVT::f32, r1);
1299 SDValue Mul = DAG.getNode(ISD::FMUL, SL, MVT::f32, LHS, r0);
1301 return DAG.getNode(ISD::FMUL, SL, MVT::f32, r3, Mul);
1304 SDValue SITargetLowering::LowerFDIV64(SDValue Op, SelectionDAG &DAG) const {
1305 if (DAG.getTarget().Options.UnsafeFPMath)
1306 return LowerFastFDIV(Op, DAG);
1309 SDValue X = Op.getOperand(0);
1310 SDValue Y = Op.getOperand(1);
1312 const SDValue One = DAG.getConstantFP(1.0, SL, MVT::f64);
1314 SDVTList ScaleVT = DAG.getVTList(MVT::f64, MVT::i1);
1316 SDValue DivScale0 = DAG.getNode(AMDGPUISD::DIV_SCALE, SL, ScaleVT, Y, Y, X);
1318 SDValue NegDivScale0 = DAG.getNode(ISD::FNEG, SL, MVT::f64, DivScale0);
1320 SDValue Rcp = DAG.getNode(AMDGPUISD::RCP, SL, MVT::f64, DivScale0);
1322 SDValue Fma0 = DAG.getNode(ISD::FMA, SL, MVT::f64, NegDivScale0, Rcp, One);
1324 SDValue Fma1 = DAG.getNode(ISD::FMA, SL, MVT::f64, Rcp, Fma0, Rcp);
1326 SDValue Fma2 = DAG.getNode(ISD::FMA, SL, MVT::f64, NegDivScale0, Fma1, One);
1328 SDValue DivScale1 = DAG.getNode(AMDGPUISD::DIV_SCALE, SL, ScaleVT, X, Y, X);
1330 SDValue Fma3 = DAG.getNode(ISD::FMA, SL, MVT::f64, Fma1, Fma2, Fma1);
1331 SDValue Mul = DAG.getNode(ISD::FMUL, SL, MVT::f64, DivScale1, Fma3);
1333 SDValue Fma4 = DAG.getNode(ISD::FMA, SL, MVT::f64,
1334 NegDivScale0, Mul, DivScale1);
1338 if (Subtarget->getGeneration() == AMDGPUSubtarget::SOUTHERN_ISLANDS) {
1339 // Workaround a hardware bug on SI where the condition output from div_scale
1342 const SDValue Hi = DAG.getConstant(1, SL, MVT::i32);
1344 // Figure out if the scale to use for div_fmas.
1345 SDValue NumBC = DAG.getNode(ISD::BITCAST, SL, MVT::v2i32, X);
1346 SDValue DenBC = DAG.getNode(ISD::BITCAST, SL, MVT::v2i32, Y);
1347 SDValue Scale0BC = DAG.getNode(ISD::BITCAST, SL, MVT::v2i32, DivScale0);
1348 SDValue Scale1BC = DAG.getNode(ISD::BITCAST, SL, MVT::v2i32, DivScale1);
1350 SDValue NumHi = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, SL, MVT::i32, NumBC, Hi);
1351 SDValue DenHi = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, SL, MVT::i32, DenBC, Hi);
1354 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, SL, MVT::i32, Scale0BC, Hi);
1356 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, SL, MVT::i32, Scale1BC, Hi);
1358 SDValue CmpDen = DAG.getSetCC(SL, MVT::i1, DenHi, Scale0Hi, ISD::SETEQ);
1359 SDValue CmpNum = DAG.getSetCC(SL, MVT::i1, NumHi, Scale1Hi, ISD::SETEQ);
1360 Scale = DAG.getNode(ISD::XOR, SL, MVT::i1, CmpNum, CmpDen);
1362 Scale = DivScale1.getValue(1);
1365 SDValue Fmas = DAG.getNode(AMDGPUISD::DIV_FMAS, SL, MVT::f64,
1366 Fma4, Fma3, Mul, Scale);
1368 return DAG.getNode(AMDGPUISD::DIV_FIXUP, SL, MVT::f64, Fmas, Y, X);
1371 SDValue SITargetLowering::LowerFDIV(SDValue Op, SelectionDAG &DAG) const {
1372 EVT VT = Op.getValueType();
1375 return LowerFDIV32(Op, DAG);
1378 return LowerFDIV64(Op, DAG);
1380 llvm_unreachable("Unexpected type for fdiv");
1383 SDValue SITargetLowering::LowerSTORE(SDValue Op, SelectionDAG &DAG) const {
1385 StoreSDNode *Store = cast<StoreSDNode>(Op);
1386 EVT VT = Store->getMemoryVT();
1388 // These stores are legal.
1389 if (Store->getAddressSpace() == AMDGPUAS::PRIVATE_ADDRESS) {
1390 if (VT.isVector() && VT.getVectorNumElements() > 4)
1391 return ScalarizeVectorStore(Op, DAG);
1395 SDValue Ret = AMDGPUTargetLowering::LowerSTORE(Op, DAG);
1399 if (VT.isVector() && VT.getVectorNumElements() >= 8)
1400 return ScalarizeVectorStore(Op, DAG);
1403 return DAG.getTruncStore(Store->getChain(), DL,
1404 DAG.getSExtOrTrunc(Store->getValue(), DL, MVT::i32),
1405 Store->getBasePtr(), MVT::i1, Store->getMemOperand());
1410 SDValue SITargetLowering::LowerTrig(SDValue Op, SelectionDAG &DAG) const {
1412 EVT VT = Op.getValueType();
1413 SDValue Arg = Op.getOperand(0);
1414 // TODO: Should this propagate fast-math-flags?
1415 SDValue FractPart = DAG.getNode(AMDGPUISD::FRACT, DL, VT,
1416 DAG.getNode(ISD::FMUL, DL, VT, Arg,
1417 DAG.getConstantFP(0.5/M_PI, DL,
1420 switch (Op.getOpcode()) {
1422 return DAG.getNode(AMDGPUISD::COS_HW, SDLoc(Op), VT, FractPart);
1424 return DAG.getNode(AMDGPUISD::SIN_HW, SDLoc(Op), VT, FractPart);
1426 llvm_unreachable("Wrong trig opcode");
1430 //===----------------------------------------------------------------------===//
1431 // Custom DAG optimizations
1432 //===----------------------------------------------------------------------===//
1434 SDValue SITargetLowering::performUCharToFloatCombine(SDNode *N,
1435 DAGCombinerInfo &DCI) const {
1436 EVT VT = N->getValueType(0);
1437 EVT ScalarVT = VT.getScalarType();
1438 if (ScalarVT != MVT::f32)
1441 SelectionDAG &DAG = DCI.DAG;
1444 SDValue Src = N->getOperand(0);
1445 EVT SrcVT = Src.getValueType();
1447 // TODO: We could try to match extracting the higher bytes, which would be
1448 // easier if i8 vectors weren't promoted to i32 vectors, particularly after
1449 // types are legalized. v4i8 -> v4f32 is probably the only case to worry
1450 // about in practice.
1451 if (DCI.isAfterLegalizeVectorOps() && SrcVT == MVT::i32) {
1452 if (DAG.MaskedValueIsZero(Src, APInt::getHighBitsSet(32, 24))) {
1453 SDValue Cvt = DAG.getNode(AMDGPUISD::CVT_F32_UBYTE0, DL, VT, Src);
1454 DCI.AddToWorklist(Cvt.getNode());
1459 // We are primarily trying to catch operations on illegal vector types
1460 // before they are expanded.
1461 // For scalars, we can use the more flexible method of checking masked bits
1462 // after legalization.
1463 if (!DCI.isBeforeLegalize() ||
1464 !SrcVT.isVector() ||
1465 SrcVT.getVectorElementType() != MVT::i8) {
1469 assert(DCI.isBeforeLegalize() && "Unexpected legal type");
1471 // Weird sized vectors are a pain to handle, but we know 3 is really the same
1473 unsigned NElts = SrcVT.getVectorNumElements();
1474 if (!SrcVT.isSimple() && NElts != 3)
1477 // Handle v4i8 -> v4f32 extload. Replace the v4i8 with a legal i32 load to
1478 // prevent a mess from expanding to v4i32 and repacking.
1479 if (ISD::isNormalLoad(Src.getNode()) && Src.hasOneUse()) {
1480 EVT LoadVT = getEquivalentMemType(*DAG.getContext(), SrcVT);
1481 EVT RegVT = getEquivalentLoadRegType(*DAG.getContext(), SrcVT);
1482 EVT FloatVT = EVT::getVectorVT(*DAG.getContext(), MVT::f32, NElts);
1483 LoadSDNode *Load = cast<LoadSDNode>(Src);
1485 unsigned AS = Load->getAddressSpace();
1486 unsigned Align = Load->getAlignment();
1487 Type *Ty = LoadVT.getTypeForEVT(*DAG.getContext());
1488 unsigned ABIAlignment = DAG.getDataLayout().getABITypeAlignment(Ty);
1490 // Don't try to replace the load if we have to expand it due to alignment
1491 // problems. Otherwise we will end up scalarizing the load, and trying to
1492 // repack into the vector for no real reason.
1493 if (Align < ABIAlignment &&
1494 !allowsMisalignedMemoryAccesses(LoadVT, AS, Align, nullptr)) {
1498 SDValue NewLoad = DAG.getExtLoad(ISD::ZEXTLOAD, DL, RegVT,
1502 Load->getMemOperand());
1504 // Make sure successors of the original load stay after it by updating
1505 // them to use the new Chain.
1506 DAG.ReplaceAllUsesOfValueWith(SDValue(Load, 1), NewLoad.getValue(1));
1508 SmallVector<SDValue, 4> Elts;
1509 if (RegVT.isVector())
1510 DAG.ExtractVectorElements(NewLoad, Elts);
1512 Elts.push_back(NewLoad);
1514 SmallVector<SDValue, 4> Ops;
1516 unsigned EltIdx = 0;
1517 for (SDValue Elt : Elts) {
1518 unsigned ComponentsInElt = std::min(4u, NElts - 4 * EltIdx);
1519 for (unsigned I = 0; I < ComponentsInElt; ++I) {
1520 unsigned Opc = AMDGPUISD::CVT_F32_UBYTE0 + I;
1521 SDValue Cvt = DAG.getNode(Opc, DL, MVT::f32, Elt);
1522 DCI.AddToWorklist(Cvt.getNode());
1529 assert(Ops.size() == NElts);
1531 return DAG.getNode(ISD::BUILD_VECTOR, DL, FloatVT, Ops);
1537 /// \brief Return true if the given offset Size in bytes can be folded into
1538 /// the immediate offsets of a memory instruction for the given address space.
1539 static bool canFoldOffset(unsigned OffsetSize, unsigned AS,
1540 const AMDGPUSubtarget &STI) {
1542 case AMDGPUAS::GLOBAL_ADDRESS: {
1543 // MUBUF instructions a 12-bit offset in bytes.
1544 return isUInt<12>(OffsetSize);
1546 case AMDGPUAS::CONSTANT_ADDRESS: {
1547 // SMRD instructions have an 8-bit offset in dwords on SI and
1548 // a 20-bit offset in bytes on VI.
1549 if (STI.getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS)
1550 return isUInt<20>(OffsetSize);
1552 return (OffsetSize % 4 == 0) && isUInt<8>(OffsetSize / 4);
1554 case AMDGPUAS::LOCAL_ADDRESS:
1555 case AMDGPUAS::REGION_ADDRESS: {
1556 // The single offset versions have a 16-bit offset in bytes.
1557 return isUInt<16>(OffsetSize);
1559 case AMDGPUAS::PRIVATE_ADDRESS:
1560 // Indirect register addressing does not use any offsets.
1566 // (shl (add x, c1), c2) -> add (shl x, c2), (shl c1, c2)
1568 // This is a variant of
1569 // (mul (add x, c1), c2) -> add (mul x, c2), (mul c1, c2),
1571 // The normal DAG combiner will do this, but only if the add has one use since
1572 // that would increase the number of instructions.
1574 // This prevents us from seeing a constant offset that can be folded into a
1575 // memory instruction's addressing mode. If we know the resulting add offset of
1576 // a pointer can be folded into an addressing offset, we can replace the pointer
1577 // operand with the add of new constant offset. This eliminates one of the uses,
1578 // and may allow the remaining use to also be simplified.
1580 SDValue SITargetLowering::performSHLPtrCombine(SDNode *N,
1582 DAGCombinerInfo &DCI) const {
1583 SDValue N0 = N->getOperand(0);
1584 SDValue N1 = N->getOperand(1);
1586 if (N0.getOpcode() != ISD::ADD)
1589 const ConstantSDNode *CN1 = dyn_cast<ConstantSDNode>(N1);
1593 const ConstantSDNode *CAdd = dyn_cast<ConstantSDNode>(N0.getOperand(1));
1597 // If the resulting offset is too large, we can't fold it into the addressing
1599 APInt Offset = CAdd->getAPIntValue() << CN1->getAPIntValue();
1600 if (!canFoldOffset(Offset.getZExtValue(), AddrSpace, *Subtarget))
1603 SelectionDAG &DAG = DCI.DAG;
1605 EVT VT = N->getValueType(0);
1607 SDValue ShlX = DAG.getNode(ISD::SHL, SL, VT, N0.getOperand(0), N1);
1608 SDValue COffset = DAG.getConstant(Offset, SL, MVT::i32);
1610 return DAG.getNode(ISD::ADD, SL, VT, ShlX, COffset);
1613 SDValue SITargetLowering::performAndCombine(SDNode *N,
1614 DAGCombinerInfo &DCI) const {
1615 if (DCI.isBeforeLegalize())
1618 SelectionDAG &DAG = DCI.DAG;
1620 // (and (fcmp ord x, x), (fcmp une (fabs x), inf)) ->
1621 // fp_class x, ~(s_nan | q_nan | n_infinity | p_infinity)
1622 SDValue LHS = N->getOperand(0);
1623 SDValue RHS = N->getOperand(1);
1625 if (LHS.getOpcode() == ISD::SETCC &&
1626 RHS.getOpcode() == ISD::SETCC) {
1627 ISD::CondCode LCC = cast<CondCodeSDNode>(LHS.getOperand(2))->get();
1628 ISD::CondCode RCC = cast<CondCodeSDNode>(RHS.getOperand(2))->get();
1630 SDValue X = LHS.getOperand(0);
1631 SDValue Y = RHS.getOperand(0);
1632 if (Y.getOpcode() != ISD::FABS || Y.getOperand(0) != X)
1635 if (LCC == ISD::SETO) {
1636 if (X != LHS.getOperand(1))
1639 if (RCC == ISD::SETUNE) {
1640 const ConstantFPSDNode *C1 = dyn_cast<ConstantFPSDNode>(RHS.getOperand(1));
1641 if (!C1 || !C1->isInfinity() || C1->isNegative())
1644 const uint32_t Mask = SIInstrFlags::N_NORMAL |
1645 SIInstrFlags::N_SUBNORMAL |
1646 SIInstrFlags::N_ZERO |
1647 SIInstrFlags::P_ZERO |
1648 SIInstrFlags::P_SUBNORMAL |
1649 SIInstrFlags::P_NORMAL;
1651 static_assert(((~(SIInstrFlags::S_NAN |
1652 SIInstrFlags::Q_NAN |
1653 SIInstrFlags::N_INFINITY |
1654 SIInstrFlags::P_INFINITY)) & 0x3ff) == Mask,
1658 return DAG.getNode(AMDGPUISD::FP_CLASS, DL, MVT::i1,
1659 X, DAG.getConstant(Mask, DL, MVT::i32));
1667 SDValue SITargetLowering::performOrCombine(SDNode *N,
1668 DAGCombinerInfo &DCI) const {
1669 SelectionDAG &DAG = DCI.DAG;
1670 SDValue LHS = N->getOperand(0);
1671 SDValue RHS = N->getOperand(1);
1673 // or (fp_class x, c1), (fp_class x, c2) -> fp_class x, (c1 | c2)
1674 if (LHS.getOpcode() == AMDGPUISD::FP_CLASS &&
1675 RHS.getOpcode() == AMDGPUISD::FP_CLASS) {
1676 SDValue Src = LHS.getOperand(0);
1677 if (Src != RHS.getOperand(0))
1680 const ConstantSDNode *CLHS = dyn_cast<ConstantSDNode>(LHS.getOperand(1));
1681 const ConstantSDNode *CRHS = dyn_cast<ConstantSDNode>(RHS.getOperand(1));
1685 // Only 10 bits are used.
1686 static const uint32_t MaxMask = 0x3ff;
1688 uint32_t NewMask = (CLHS->getZExtValue() | CRHS->getZExtValue()) & MaxMask;
1690 return DAG.getNode(AMDGPUISD::FP_CLASS, DL, MVT::i1,
1691 Src, DAG.getConstant(NewMask, DL, MVT::i32));
1697 SDValue SITargetLowering::performClassCombine(SDNode *N,
1698 DAGCombinerInfo &DCI) const {
1699 SelectionDAG &DAG = DCI.DAG;
1700 SDValue Mask = N->getOperand(1);
1702 // fp_class x, 0 -> false
1703 if (const ConstantSDNode *CMask = dyn_cast<ConstantSDNode>(Mask)) {
1704 if (CMask->isNullValue())
1705 return DAG.getConstant(0, SDLoc(N), MVT::i1);
1711 static unsigned minMaxOpcToMin3Max3Opc(unsigned Opc) {
1714 return AMDGPUISD::FMAX3;
1716 return AMDGPUISD::SMAX3;
1718 return AMDGPUISD::UMAX3;
1720 return AMDGPUISD::FMIN3;
1722 return AMDGPUISD::SMIN3;
1724 return AMDGPUISD::UMIN3;
1726 llvm_unreachable("Not a min/max opcode");
1730 SDValue SITargetLowering::performMin3Max3Combine(SDNode *N,
1731 DAGCombinerInfo &DCI) const {
1732 SelectionDAG &DAG = DCI.DAG;
1734 unsigned Opc = N->getOpcode();
1735 SDValue Op0 = N->getOperand(0);
1736 SDValue Op1 = N->getOperand(1);
1738 // Only do this if the inner op has one use since this will just increases
1739 // register pressure for no benefit.
1741 // max(max(a, b), c)
1742 if (Op0.getOpcode() == Opc && Op0.hasOneUse()) {
1744 return DAG.getNode(minMaxOpcToMin3Max3Opc(Opc),
1752 // max(a, max(b, c))
1753 if (Op1.getOpcode() == Opc && Op1.hasOneUse()) {
1755 return DAG.getNode(minMaxOpcToMin3Max3Opc(Opc),
1766 SDValue SITargetLowering::performSetCCCombine(SDNode *N,
1767 DAGCombinerInfo &DCI) const {
1768 SelectionDAG &DAG = DCI.DAG;
1771 SDValue LHS = N->getOperand(0);
1772 SDValue RHS = N->getOperand(1);
1773 EVT VT = LHS.getValueType();
1775 if (VT != MVT::f32 && VT != MVT::f64)
1778 // Match isinf pattern
1779 // (fcmp oeq (fabs x), inf) -> (fp_class x, (p_infinity | n_infinity))
1780 ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(2))->get();
1781 if (CC == ISD::SETOEQ && LHS.getOpcode() == ISD::FABS) {
1782 const ConstantFPSDNode *CRHS = dyn_cast<ConstantFPSDNode>(RHS);
1786 const APFloat &APF = CRHS->getValueAPF();
1787 if (APF.isInfinity() && !APF.isNegative()) {
1788 unsigned Mask = SIInstrFlags::P_INFINITY | SIInstrFlags::N_INFINITY;
1789 return DAG.getNode(AMDGPUISD::FP_CLASS, SL, MVT::i1, LHS.getOperand(0),
1790 DAG.getConstant(Mask, SL, MVT::i32));
1797 SDValue SITargetLowering::PerformDAGCombine(SDNode *N,
1798 DAGCombinerInfo &DCI) const {
1799 SelectionDAG &DAG = DCI.DAG;
1802 switch (N->getOpcode()) {
1804 return AMDGPUTargetLowering::PerformDAGCombine(N, DCI);
1806 return performSetCCCombine(N, DCI);
1807 case ISD::FMAXNUM: // TODO: What about fmax_legacy?
1813 if (DCI.getDAGCombineLevel() >= AfterLegalizeDAG &&
1814 N->getValueType(0) != MVT::f64 &&
1815 getTargetMachine().getOptLevel() > CodeGenOpt::None)
1816 return performMin3Max3Combine(N, DCI);
1820 case AMDGPUISD::CVT_F32_UBYTE0:
1821 case AMDGPUISD::CVT_F32_UBYTE1:
1822 case AMDGPUISD::CVT_F32_UBYTE2:
1823 case AMDGPUISD::CVT_F32_UBYTE3: {
1824 unsigned Offset = N->getOpcode() - AMDGPUISD::CVT_F32_UBYTE0;
1826 SDValue Src = N->getOperand(0);
1827 APInt Demanded = APInt::getBitsSet(32, 8 * Offset, 8 * Offset + 8);
1829 APInt KnownZero, KnownOne;
1830 TargetLowering::TargetLoweringOpt TLO(DAG, !DCI.isBeforeLegalize(),
1831 !DCI.isBeforeLegalizeOps());
1832 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
1833 if (TLO.ShrinkDemandedConstant(Src, Demanded) ||
1834 TLI.SimplifyDemandedBits(Src, Demanded, KnownZero, KnownOne, TLO)) {
1835 DCI.CommitTargetLoweringOpt(TLO);
1841 case ISD::UINT_TO_FP: {
1842 return performUCharToFloatCombine(N, DCI);
1845 if (DCI.getDAGCombineLevel() < AfterLegalizeDAG)
1848 EVT VT = N->getValueType(0);
1852 // Only do this if we are not trying to support denormals. v_mad_f32 does
1853 // not support denormals ever.
1854 if (Subtarget->hasFP32Denormals())
1857 SDValue LHS = N->getOperand(0);
1858 SDValue RHS = N->getOperand(1);
1860 // These should really be instruction patterns, but writing patterns with
1861 // source modiifiers is a pain.
1863 // fadd (fadd (a, a), b) -> mad 2.0, a, b
1864 if (LHS.getOpcode() == ISD::FADD) {
1865 SDValue A = LHS.getOperand(0);
1866 if (A == LHS.getOperand(1)) {
1867 const SDValue Two = DAG.getConstantFP(2.0, DL, MVT::f32);
1868 return DAG.getNode(ISD::FMAD, DL, VT, Two, A, RHS);
1872 // fadd (b, fadd (a, a)) -> mad 2.0, a, b
1873 if (RHS.getOpcode() == ISD::FADD) {
1874 SDValue A = RHS.getOperand(0);
1875 if (A == RHS.getOperand(1)) {
1876 const SDValue Two = DAG.getConstantFP(2.0, DL, MVT::f32);
1877 return DAG.getNode(ISD::FMAD, DL, VT, Two, A, LHS);
1884 if (DCI.getDAGCombineLevel() < AfterLegalizeDAG)
1887 EVT VT = N->getValueType(0);
1889 // Try to get the fneg to fold into the source modifier. This undoes generic
1890 // DAG combines and folds them into the mad.
1892 // Only do this if we are not trying to support denormals. v_mad_f32 does
1893 // not support denormals ever.
1894 if (VT == MVT::f32 &&
1895 !Subtarget->hasFP32Denormals()) {
1896 SDValue LHS = N->getOperand(0);
1897 SDValue RHS = N->getOperand(1);
1898 if (LHS.getOpcode() == ISD::FADD) {
1899 // (fsub (fadd a, a), c) -> mad 2.0, a, (fneg c)
1901 SDValue A = LHS.getOperand(0);
1902 if (A == LHS.getOperand(1)) {
1903 const SDValue Two = DAG.getConstantFP(2.0, DL, MVT::f32);
1904 SDValue NegRHS = DAG.getNode(ISD::FNEG, DL, VT, RHS);
1906 return DAG.getNode(ISD::FMAD, DL, VT, Two, A, NegRHS);
1910 if (RHS.getOpcode() == ISD::FADD) {
1911 // (fsub c, (fadd a, a)) -> mad -2.0, a, c
1913 SDValue A = RHS.getOperand(0);
1914 if (A == RHS.getOperand(1)) {
1915 const SDValue NegTwo = DAG.getConstantFP(-2.0, DL, MVT::f32);
1916 return DAG.getNode(ISD::FMAD, DL, VT, NegTwo, A, LHS);
1928 case ISD::ATOMIC_LOAD:
1929 case ISD::ATOMIC_STORE:
1930 case ISD::ATOMIC_CMP_SWAP:
1931 case ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS:
1932 case ISD::ATOMIC_SWAP:
1933 case ISD::ATOMIC_LOAD_ADD:
1934 case ISD::ATOMIC_LOAD_SUB:
1935 case ISD::ATOMIC_LOAD_AND:
1936 case ISD::ATOMIC_LOAD_OR:
1937 case ISD::ATOMIC_LOAD_XOR:
1938 case ISD::ATOMIC_LOAD_NAND:
1939 case ISD::ATOMIC_LOAD_MIN:
1940 case ISD::ATOMIC_LOAD_MAX:
1941 case ISD::ATOMIC_LOAD_UMIN:
1942 case ISD::ATOMIC_LOAD_UMAX: { // TODO: Target mem intrinsics.
1943 if (DCI.isBeforeLegalize())
1946 MemSDNode *MemNode = cast<MemSDNode>(N);
1947 SDValue Ptr = MemNode->getBasePtr();
1949 // TODO: We could also do this for multiplies.
1950 unsigned AS = MemNode->getAddressSpace();
1951 if (Ptr.getOpcode() == ISD::SHL && AS != AMDGPUAS::PRIVATE_ADDRESS) {
1952 SDValue NewPtr = performSHLPtrCombine(Ptr.getNode(), AS, DCI);
1954 SmallVector<SDValue, 8> NewOps(MemNode->op_begin(), MemNode->op_end());
1956 NewOps[N->getOpcode() == ISD::STORE ? 2 : 1] = NewPtr;
1957 return SDValue(DAG.UpdateNodeOperands(MemNode, NewOps), 0);
1963 return performAndCombine(N, DCI);
1965 return performOrCombine(N, DCI);
1966 case AMDGPUISD::FP_CLASS:
1967 return performClassCombine(N, DCI);
1969 return AMDGPUTargetLowering::PerformDAGCombine(N, DCI);
1972 /// \brief Analyze the possible immediate value Op
1974 /// Returns -1 if it isn't an immediate, 0 if it's and inline immediate
1975 /// and the immediate value if it's a literal immediate
1976 int32_t SITargetLowering::analyzeImmediate(const SDNode *N) const {
1978 const SIInstrInfo *TII =
1979 static_cast<const SIInstrInfo *>(Subtarget->getInstrInfo());
1981 if (const ConstantSDNode *Node = dyn_cast<ConstantSDNode>(N)) {
1982 if (TII->isInlineConstant(Node->getAPIntValue()))
1985 uint64_t Val = Node->getZExtValue();
1986 return isUInt<32>(Val) ? Val : -1;
1989 if (const ConstantFPSDNode *Node = dyn_cast<ConstantFPSDNode>(N)) {
1990 if (TII->isInlineConstant(Node->getValueAPF().bitcastToAPInt()))
1993 if (Node->getValueType(0) == MVT::f32)
1994 return FloatToBits(Node->getValueAPF().convertToFloat());
2002 /// \brief Helper function for adjustWritemask
2003 static unsigned SubIdx2Lane(unsigned Idx) {
2006 case AMDGPU::sub0: return 0;
2007 case AMDGPU::sub1: return 1;
2008 case AMDGPU::sub2: return 2;
2009 case AMDGPU::sub3: return 3;
2013 /// \brief Adjust the writemask of MIMG instructions
2014 void SITargetLowering::adjustWritemask(MachineSDNode *&Node,
2015 SelectionDAG &DAG) const {
2016 SDNode *Users[4] = { };
2018 unsigned OldDmask = Node->getConstantOperandVal(0);
2019 unsigned NewDmask = 0;
2021 // Try to figure out the used register components
2022 for (SDNode::use_iterator I = Node->use_begin(), E = Node->use_end();
2025 // Abort if we can't understand the usage
2026 if (!I->isMachineOpcode() ||
2027 I->getMachineOpcode() != TargetOpcode::EXTRACT_SUBREG)
2030 // Lane means which subreg of %VGPRa_VGPRb_VGPRc_VGPRd is used.
2031 // Note that subregs are packed, i.e. Lane==0 is the first bit set
2032 // in OldDmask, so it can be any of X,Y,Z,W; Lane==1 is the second bit
2034 Lane = SubIdx2Lane(I->getConstantOperandVal(1));
2036 // Set which texture component corresponds to the lane.
2038 for (unsigned i = 0, Dmask = OldDmask; i <= Lane; i++) {
2040 Comp = countTrailingZeros(Dmask);
2041 Dmask &= ~(1 << Comp);
2044 // Abort if we have more than one user per component
2049 NewDmask |= 1 << Comp;
2052 // Abort if there's no change
2053 if (NewDmask == OldDmask)
2056 // Adjust the writemask in the node
2057 std::vector<SDValue> Ops;
2058 Ops.push_back(DAG.getTargetConstant(NewDmask, SDLoc(Node), MVT::i32));
2059 Ops.insert(Ops.end(), Node->op_begin() + 1, Node->op_end());
2060 Node = (MachineSDNode*)DAG.UpdateNodeOperands(Node, Ops);
2062 // If we only got one lane, replace it with a copy
2063 // (if NewDmask has only one bit set...)
2064 if (NewDmask && (NewDmask & (NewDmask-1)) == 0) {
2065 SDValue RC = DAG.getTargetConstant(AMDGPU::VGPR_32RegClassID, SDLoc(),
2067 SDNode *Copy = DAG.getMachineNode(TargetOpcode::COPY_TO_REGCLASS,
2068 SDLoc(), Users[Lane]->getValueType(0),
2069 SDValue(Node, 0), RC);
2070 DAG.ReplaceAllUsesWith(Users[Lane], Copy);
2074 // Update the users of the node with the new indices
2075 for (unsigned i = 0, Idx = AMDGPU::sub0; i < 4; ++i) {
2077 SDNode *User = Users[i];
2081 SDValue Op = DAG.getTargetConstant(Idx, SDLoc(User), MVT::i32);
2082 DAG.UpdateNodeOperands(User, User->getOperand(0), Op);
2086 case AMDGPU::sub0: Idx = AMDGPU::sub1; break;
2087 case AMDGPU::sub1: Idx = AMDGPU::sub2; break;
2088 case AMDGPU::sub2: Idx = AMDGPU::sub3; break;
2093 static bool isFrameIndexOp(SDValue Op) {
2094 if (Op.getOpcode() == ISD::AssertZext)
2095 Op = Op.getOperand(0);
2097 return isa<FrameIndexSDNode>(Op);
2100 /// \brief Legalize target independent instructions (e.g. INSERT_SUBREG)
2101 /// with frame index operands.
2102 /// LLVM assumes that inputs are to these instructions are registers.
2103 void SITargetLowering::legalizeTargetIndependentNode(SDNode *Node,
2104 SelectionDAG &DAG) const {
2106 SmallVector<SDValue, 8> Ops;
2107 for (unsigned i = 0; i < Node->getNumOperands(); ++i) {
2108 if (!isFrameIndexOp(Node->getOperand(i))) {
2109 Ops.push_back(Node->getOperand(i));
2114 Ops.push_back(SDValue(DAG.getMachineNode(AMDGPU::S_MOV_B32, DL,
2115 Node->getOperand(i).getValueType(),
2116 Node->getOperand(i)), 0));
2119 DAG.UpdateNodeOperands(Node, Ops);
2122 /// \brief Fold the instructions after selecting them.
2123 SDNode *SITargetLowering::PostISelFolding(MachineSDNode *Node,
2124 SelectionDAG &DAG) const {
2125 const SIInstrInfo *TII =
2126 static_cast<const SIInstrInfo *>(Subtarget->getInstrInfo());
2128 if (TII->isMIMG(Node->getMachineOpcode()))
2129 adjustWritemask(Node, DAG);
2131 if (Node->getMachineOpcode() == AMDGPU::INSERT_SUBREG ||
2132 Node->getMachineOpcode() == AMDGPU::REG_SEQUENCE) {
2133 legalizeTargetIndependentNode(Node, DAG);
2139 /// \brief Assign the register class depending on the number of
2140 /// bits set in the writemask
2141 void SITargetLowering::AdjustInstrPostInstrSelection(MachineInstr *MI,
2142 SDNode *Node) const {
2143 const SIInstrInfo *TII =
2144 static_cast<const SIInstrInfo *>(Subtarget->getInstrInfo());
2146 MachineRegisterInfo &MRI = MI->getParent()->getParent()->getRegInfo();
2147 TII->legalizeOperands(MI);
2149 if (TII->isMIMG(MI->getOpcode())) {
2150 unsigned VReg = MI->getOperand(0).getReg();
2151 unsigned Writemask = MI->getOperand(1).getImm();
2152 unsigned BitsSet = 0;
2153 for (unsigned i = 0; i < 4; ++i)
2154 BitsSet += Writemask & (1 << i) ? 1 : 0;
2156 const TargetRegisterClass *RC;
2159 case 1: RC = &AMDGPU::VGPR_32RegClass; break;
2160 case 2: RC = &AMDGPU::VReg_64RegClass; break;
2161 case 3: RC = &AMDGPU::VReg_96RegClass; break;
2164 unsigned NewOpcode = TII->getMaskedMIMGOp(MI->getOpcode(), BitsSet);
2165 MI->setDesc(TII->get(NewOpcode));
2166 MRI.setRegClass(VReg, RC);
2170 // Replace unused atomics with the no return version.
2171 int NoRetAtomicOp = AMDGPU::getAtomicNoRetOp(MI->getOpcode());
2172 if (NoRetAtomicOp != -1) {
2173 if (!Node->hasAnyUseOfValue(0)) {
2174 MI->setDesc(TII->get(NoRetAtomicOp));
2175 MI->RemoveOperand(0);
2182 static SDValue buildSMovImm32(SelectionDAG &DAG, SDLoc DL, uint64_t Val) {
2183 SDValue K = DAG.getTargetConstant(Val, DL, MVT::i32);
2184 return SDValue(DAG.getMachineNode(AMDGPU::S_MOV_B32, DL, MVT::i32, K), 0);
2187 MachineSDNode *SITargetLowering::wrapAddr64Rsrc(SelectionDAG &DAG,
2189 SDValue Ptr) const {
2190 const SIInstrInfo *TII =
2191 static_cast<const SIInstrInfo *>(Subtarget->getInstrInfo());
2193 // Build the half of the subregister with the constants before building the
2194 // full 128-bit register. If we are building multiple resource descriptors,
2195 // this will allow CSEing of the 2-component register.
2196 const SDValue Ops0[] = {
2197 DAG.getTargetConstant(AMDGPU::SGPR_64RegClassID, DL, MVT::i32),
2198 buildSMovImm32(DAG, DL, 0),
2199 DAG.getTargetConstant(AMDGPU::sub0, DL, MVT::i32),
2200 buildSMovImm32(DAG, DL, TII->getDefaultRsrcDataFormat() >> 32),
2201 DAG.getTargetConstant(AMDGPU::sub1, DL, MVT::i32)
2204 SDValue SubRegHi = SDValue(DAG.getMachineNode(AMDGPU::REG_SEQUENCE, DL,
2205 MVT::v2i32, Ops0), 0);
2207 // Combine the constants and the pointer.
2208 const SDValue Ops1[] = {
2209 DAG.getTargetConstant(AMDGPU::SReg_128RegClassID, DL, MVT::i32),
2211 DAG.getTargetConstant(AMDGPU::sub0_sub1, DL, MVT::i32),
2213 DAG.getTargetConstant(AMDGPU::sub2_sub3, DL, MVT::i32)
2216 return DAG.getMachineNode(AMDGPU::REG_SEQUENCE, DL, MVT::v4i32, Ops1);
2219 /// \brief Return a resource descriptor with the 'Add TID' bit enabled
2220 /// The TID (Thread ID) is multiplied by the stride value (bits [61:48]
2221 /// of the resource descriptor) to create an offset, which is added to
2222 /// the resource pointer.
2223 MachineSDNode *SITargetLowering::buildRSRC(SelectionDAG &DAG,
2226 uint32_t RsrcDword1,
2227 uint64_t RsrcDword2And3) const {
2228 SDValue PtrLo = DAG.getTargetExtractSubreg(AMDGPU::sub0, DL, MVT::i32, Ptr);
2229 SDValue PtrHi = DAG.getTargetExtractSubreg(AMDGPU::sub1, DL, MVT::i32, Ptr);
2231 PtrHi = SDValue(DAG.getMachineNode(AMDGPU::S_OR_B32, DL, MVT::i32, PtrHi,
2232 DAG.getConstant(RsrcDword1, DL, MVT::i32)),
2236 SDValue DataLo = buildSMovImm32(DAG, DL,
2237 RsrcDword2And3 & UINT64_C(0xFFFFFFFF));
2238 SDValue DataHi = buildSMovImm32(DAG, DL, RsrcDword2And3 >> 32);
2240 const SDValue Ops[] = {
2241 DAG.getTargetConstant(AMDGPU::SReg_128RegClassID, DL, MVT::i32),
2243 DAG.getTargetConstant(AMDGPU::sub0, DL, MVT::i32),
2245 DAG.getTargetConstant(AMDGPU::sub1, DL, MVT::i32),
2247 DAG.getTargetConstant(AMDGPU::sub2, DL, MVT::i32),
2249 DAG.getTargetConstant(AMDGPU::sub3, DL, MVT::i32)
2252 return DAG.getMachineNode(AMDGPU::REG_SEQUENCE, DL, MVT::v4i32, Ops);
2255 MachineSDNode *SITargetLowering::buildScratchRSRC(SelectionDAG &DAG,
2257 SDValue Ptr) const {
2258 const SIInstrInfo *TII =
2259 static_cast<const SIInstrInfo *>(Subtarget->getInstrInfo());
2261 return buildRSRC(DAG, DL, Ptr, 0, TII->getScratchRsrcWords23());
2264 SDValue SITargetLowering::CreateLiveInRegister(SelectionDAG &DAG,
2265 const TargetRegisterClass *RC,
2266 unsigned Reg, EVT VT) const {
2267 SDValue VReg = AMDGPUTargetLowering::CreateLiveInRegister(DAG, RC, Reg, VT);
2269 return DAG.getCopyFromReg(DAG.getEntryNode(), SDLoc(DAG.getEntryNode()),
2270 cast<RegisterSDNode>(VReg)->getReg(), VT);
2273 //===----------------------------------------------------------------------===//
2274 // SI Inline Assembly Support
2275 //===----------------------------------------------------------------------===//
2277 std::pair<unsigned, const TargetRegisterClass *>
2278 SITargetLowering::getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI,
2279 StringRef Constraint,
2281 if (Constraint == "r") {
2282 switch(VT.SimpleTy) {
2283 default: llvm_unreachable("Unhandled type for 'r' inline asm constraint");
2285 return std::make_pair(0U, &AMDGPU::SGPR_64RegClass);
2287 return std::make_pair(0U, &AMDGPU::SGPR_32RegClass);
2291 if (Constraint.size() > 1) {
2292 const TargetRegisterClass *RC = nullptr;
2293 if (Constraint[1] == 'v') {
2294 RC = &AMDGPU::VGPR_32RegClass;
2295 } else if (Constraint[1] == 's') {
2296 RC = &AMDGPU::SGPR_32RegClass;
2301 bool Failed = Constraint.substr(2).getAsInteger(10, Idx);
2302 if (!Failed && Idx < RC->getNumRegs())
2303 return std::make_pair(RC->getRegister(Idx), RC);
2306 return TargetLowering::getRegForInlineAsmConstraint(TRI, Constraint, VT);