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::v16i16, Expand);
162 setOperationAction(ISD::LOAD, MVT::i1, Custom);
164 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
165 setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);
166 setOperationAction(ISD::FrameIndex, MVT::i32, Custom);
168 // These should use UDIVREM, so set them to expand
169 setOperationAction(ISD::UDIV, MVT::i64, Expand);
170 setOperationAction(ISD::UREM, MVT::i64, Expand);
172 setOperationAction(ISD::SELECT_CC, MVT::i1, Expand);
173 setOperationAction(ISD::SELECT, MVT::i1, Promote);
175 // We only support LOAD/STORE and vector manipulation ops for vectors
176 // with > 4 elements.
177 for (MVT VT : {MVT::v8i32, MVT::v8f32, MVT::v16i32, MVT::v16f32}) {
178 for (unsigned Op = 0; Op < ISD::BUILTIN_OP_END; ++Op) {
182 case ISD::BUILD_VECTOR:
184 case ISD::EXTRACT_VECTOR_ELT:
185 case ISD::INSERT_VECTOR_ELT:
186 case ISD::INSERT_SUBVECTOR:
187 case ISD::EXTRACT_SUBVECTOR:
189 case ISD::CONCAT_VECTORS:
190 setOperationAction(Op, VT, Custom);
193 setOperationAction(Op, VT, Expand);
199 if (Subtarget->getGeneration() >= AMDGPUSubtarget::SEA_ISLANDS) {
200 setOperationAction(ISD::FTRUNC, MVT::f64, Legal);
201 setOperationAction(ISD::FCEIL, MVT::f64, Legal);
202 setOperationAction(ISD::FRINT, MVT::f64, Legal);
205 setOperationAction(ISD::FFLOOR, MVT::f64, Legal);
206 setOperationAction(ISD::FDIV, MVT::f32, Custom);
207 setOperationAction(ISD::FDIV, MVT::f64, Custom);
209 setTargetDAGCombine(ISD::FADD);
210 setTargetDAGCombine(ISD::FSUB);
211 setTargetDAGCombine(ISD::FMINNUM);
212 setTargetDAGCombine(ISD::FMAXNUM);
213 setTargetDAGCombine(ISD::SMIN);
214 setTargetDAGCombine(ISD::SMAX);
215 setTargetDAGCombine(ISD::UMIN);
216 setTargetDAGCombine(ISD::UMAX);
217 setTargetDAGCombine(ISD::SELECT_CC);
218 setTargetDAGCombine(ISD::SETCC);
219 setTargetDAGCombine(ISD::AND);
220 setTargetDAGCombine(ISD::OR);
221 setTargetDAGCombine(ISD::UINT_TO_FP);
223 // All memory operations. Some folding on the pointer operand is done to help
224 // matching the constant offsets in the addressing modes.
225 setTargetDAGCombine(ISD::LOAD);
226 setTargetDAGCombine(ISD::STORE);
227 setTargetDAGCombine(ISD::ATOMIC_LOAD);
228 setTargetDAGCombine(ISD::ATOMIC_STORE);
229 setTargetDAGCombine(ISD::ATOMIC_CMP_SWAP);
230 setTargetDAGCombine(ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS);
231 setTargetDAGCombine(ISD::ATOMIC_SWAP);
232 setTargetDAGCombine(ISD::ATOMIC_LOAD_ADD);
233 setTargetDAGCombine(ISD::ATOMIC_LOAD_SUB);
234 setTargetDAGCombine(ISD::ATOMIC_LOAD_AND);
235 setTargetDAGCombine(ISD::ATOMIC_LOAD_OR);
236 setTargetDAGCombine(ISD::ATOMIC_LOAD_XOR);
237 setTargetDAGCombine(ISD::ATOMIC_LOAD_NAND);
238 setTargetDAGCombine(ISD::ATOMIC_LOAD_MIN);
239 setTargetDAGCombine(ISD::ATOMIC_LOAD_MAX);
240 setTargetDAGCombine(ISD::ATOMIC_LOAD_UMIN);
241 setTargetDAGCombine(ISD::ATOMIC_LOAD_UMAX);
243 setSchedulingPreference(Sched::RegPressure);
246 //===----------------------------------------------------------------------===//
247 // TargetLowering queries
248 //===----------------------------------------------------------------------===//
250 bool SITargetLowering::isShuffleMaskLegal(const SmallVectorImpl<int> &,
252 // SI has some legal vector types, but no legal vector operations. Say no
253 // shuffles are legal in order to prefer scalarizing some vector operations.
257 bool SITargetLowering::isLegalAddressingMode(const AddrMode &AM,
258 Type *Ty, unsigned AS) const {
259 // No global is ever allowed as a base.
264 case AMDGPUAS::GLOBAL_ADDRESS:
265 case AMDGPUAS::CONSTANT_ADDRESS: // XXX - Should we assume SMRD instructions?
266 case AMDGPUAS::PRIVATE_ADDRESS:
267 case AMDGPUAS::UNKNOWN_ADDRESS_SPACE: {
268 // MUBUF / MTBUF instructions have a 12-bit unsigned byte offset, and
269 // additionally can do r + r + i with addr64. 32-bit has more addressing
270 // mode options. Depending on the resource constant, it can also do
271 // (i64 r0) + (i32 r1) * (i14 i).
273 // SMRD instructions have an 8-bit, dword offset.
275 // Assume nonunifom access, since the address space isn't enough to know
276 // what instruction we will use, and since we don't know if this is a load
277 // or store and scalar stores are only available on VI.
279 // We also know if we are doing an extload, we can't do a scalar load.
281 // Private arrays end up using a scratch buffer most of the time, so also
282 // assume those use MUBUF instructions. Scratch loads / stores are currently
283 // implemented as mubuf instructions with offen bit set, so slightly
284 // different than the normal addr64.
285 if (!isUInt<12>(AM.BaseOffs))
288 // FIXME: Since we can split immediate into soffset and immediate offset,
289 // would it make sense to allow any immediate?
292 case 0: // r + i or just i, depending on HasBaseReg.
295 return true; // We have r + r or r + i.
302 // Allow 2 * r as r + r
303 // Or 2 * r + i is allowed as r + r + i.
305 default: // Don't allow n * r
309 case AMDGPUAS::LOCAL_ADDRESS:
310 case AMDGPUAS::REGION_ADDRESS: {
311 // Basic, single offset DS instructions allow a 16-bit unsigned immediate
313 // XXX - If doing a 4-byte aligned 8-byte type access, we effectively have
314 // an 8-bit dword offset but we don't know the alignment here.
315 if (!isUInt<16>(AM.BaseOffs))
318 if (AM.Scale == 0) // r + i or just i, depending on HasBaseReg.
321 if (AM.Scale == 1 && AM.HasBaseReg)
326 case AMDGPUAS::FLAT_ADDRESS: {
327 // Flat instructions do not have offsets, and only have the register
329 return AM.BaseOffs == 0 && (AM.Scale == 0 || AM.Scale == 1);
332 llvm_unreachable("unhandled address space");
336 bool SITargetLowering::allowsMisalignedMemoryAccesses(EVT VT,
339 bool *IsFast) const {
343 // TODO: I think v3i32 should allow unaligned accesses on CI with DS_READ_B96,
344 // which isn't a simple VT.
345 if (!VT.isSimple() || VT == MVT::Other)
348 // TODO - CI+ supports unaligned memory accesses, but this requires driver
351 // XXX - The only mention I see of this in the ISA manual is for LDS direct
352 // reads the "byte address and must be dword aligned". Is it also true for the
353 // normal loads and stores?
354 if (AddrSpace == AMDGPUAS::LOCAL_ADDRESS) {
355 // ds_read/write_b64 require 8-byte alignment, but we can do a 4 byte
356 // aligned, 8 byte access in a single operation using ds_read2/write2_b32
357 // with adjacent offsets.
358 return Align % 4 == 0;
361 // Smaller than dword value must be aligned.
362 // FIXME: This should be allowed on CI+
363 if (VT.bitsLT(MVT::i32))
366 // 8.1.6 - For Dword or larger reads or writes, the two LSBs of the
367 // byte-address are ignored, thus forcing Dword alignment.
368 // This applies to private, global, and constant memory.
372 return VT.bitsGT(MVT::i32) && Align % 4 == 0;
375 EVT SITargetLowering::getOptimalMemOpType(uint64_t Size, unsigned DstAlign,
376 unsigned SrcAlign, bool IsMemset,
379 MachineFunction &MF) const {
380 // FIXME: Should account for address space here.
382 // The default fallback uses the private pointer size as a guess for a type to
383 // use. Make sure we switch these to 64-bit accesses.
385 if (Size >= 16 && DstAlign >= 4) // XXX: Should only do for global
388 if (Size >= 8 && DstAlign >= 4)
395 TargetLoweringBase::LegalizeTypeAction
396 SITargetLowering::getPreferredVectorAction(EVT VT) const {
397 if (VT.getVectorNumElements() != 1 && VT.getScalarType().bitsLE(MVT::i16))
398 return TypeSplitVector;
400 return TargetLoweringBase::getPreferredVectorAction(VT);
403 bool SITargetLowering::shouldConvertConstantLoadToIntImm(const APInt &Imm,
405 const SIInstrInfo *TII =
406 static_cast<const SIInstrInfo *>(Subtarget->getInstrInfo());
407 return TII->isInlineConstant(Imm);
410 static EVT toIntegerVT(EVT VT) {
412 return VT.changeVectorElementTypeToInteger();
413 return MVT::getIntegerVT(VT.getSizeInBits());
416 SDValue SITargetLowering::LowerParameter(SelectionDAG &DAG, EVT VT, EVT MemVT,
417 SDLoc SL, SDValue Chain,
418 unsigned Offset, bool Signed) const {
419 const DataLayout *DL = getDataLayout();
420 MachineFunction &MF = DAG.getMachineFunction();
421 const SIRegisterInfo *TRI =
422 static_cast<const SIRegisterInfo*>(Subtarget->getRegisterInfo());
423 unsigned InputPtrReg = TRI->getPreloadedValue(MF, SIRegisterInfo::INPUT_PTR);
425 Type *Ty = VT.getTypeForEVT(*DAG.getContext());
427 MachineRegisterInfo &MRI = DAG.getMachineFunction().getRegInfo();
428 MVT PtrVT = getPointerTy(DAG.getDataLayout(), AMDGPUAS::CONSTANT_ADDRESS);
429 PointerType *PtrTy = PointerType::get(Ty, AMDGPUAS::CONSTANT_ADDRESS);
430 SDValue BasePtr = DAG.getCopyFromReg(Chain, SL,
431 MRI.getLiveInVirtReg(InputPtrReg), PtrVT);
432 SDValue Ptr = DAG.getNode(ISD::ADD, SL, PtrVT, BasePtr,
433 DAG.getConstant(Offset, SL, PtrVT));
434 SDValue PtrOffset = DAG.getUNDEF(PtrVT);
435 MachinePointerInfo PtrInfo(UndefValue::get(PtrTy));
437 unsigned Align = DL->getABITypeAlignment(Ty);
439 if (VT != MemVT && VT.isFloatingPoint()) {
440 // Do an integer load and convert.
441 // FIXME: This is mostly because load legalization after type legalization
442 // doesn't handle FP extloads.
443 assert(VT.getScalarType() == MVT::f32 &&
444 MemVT.getScalarType() == MVT::f16);
446 EVT IVT = toIntegerVT(VT);
447 EVT MemIVT = toIntegerVT(MemVT);
448 SDValue Load = DAG.getLoad(ISD::UNINDEXED, ISD::ZEXTLOAD,
449 IVT, SL, Chain, Ptr, PtrOffset, PtrInfo, MemIVT,
451 true, // isNonTemporal
454 return DAG.getNode(ISD::FP16_TO_FP, SL, VT, Load);
457 ISD::LoadExtType ExtTy = Signed ? ISD::SEXTLOAD : ISD::ZEXTLOAD;
458 return DAG.getLoad(ISD::UNINDEXED, ExtTy,
459 VT, SL, Chain, Ptr, PtrOffset, PtrInfo, MemVT,
461 true, // isNonTemporal
466 SDValue SITargetLowering::LowerFormalArguments(
467 SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
468 const SmallVectorImpl<ISD::InputArg> &Ins, SDLoc DL, SelectionDAG &DAG,
469 SmallVectorImpl<SDValue> &InVals) const {
470 const SIRegisterInfo *TRI =
471 static_cast<const SIRegisterInfo *>(Subtarget->getRegisterInfo());
473 MachineFunction &MF = DAG.getMachineFunction();
474 FunctionType *FType = MF.getFunction()->getFunctionType();
475 SIMachineFunctionInfo *Info = MF.getInfo<SIMachineFunctionInfo>();
477 assert(CallConv == CallingConv::C);
479 SmallVector<ISD::InputArg, 16> Splits;
480 BitVector Skipped(Ins.size());
482 for (unsigned i = 0, e = Ins.size(), PSInputNum = 0; i != e; ++i) {
483 const ISD::InputArg &Arg = Ins[i];
485 // First check if it's a PS input addr
486 if (Info->getShaderType() == ShaderType::PIXEL && !Arg.Flags.isInReg() &&
487 !Arg.Flags.isByVal()) {
489 assert((PSInputNum <= 15) && "Too many PS inputs!");
492 // We can savely skip PS inputs
498 Info->PSInputAddr |= 1 << PSInputNum++;
501 // Second split vertices into their elements
502 if (Info->getShaderType() != ShaderType::COMPUTE && Arg.VT.isVector()) {
503 ISD::InputArg NewArg = Arg;
504 NewArg.Flags.setSplit();
505 NewArg.VT = Arg.VT.getVectorElementType();
507 // We REALLY want the ORIGINAL number of vertex elements here, e.g. a
508 // three or five element vertex only needs three or five registers,
509 // NOT four or eigth.
510 Type *ParamType = FType->getParamType(Arg.getOrigArgIndex());
511 unsigned NumElements = ParamType->getVectorNumElements();
513 for (unsigned j = 0; j != NumElements; ++j) {
514 Splits.push_back(NewArg);
515 NewArg.PartOffset += NewArg.VT.getStoreSize();
518 } else if (Info->getShaderType() != ShaderType::COMPUTE) {
519 Splits.push_back(Arg);
523 SmallVector<CCValAssign, 16> ArgLocs;
524 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), ArgLocs,
527 // At least one interpolation mode must be enabled or else the GPU will hang.
528 if (Info->getShaderType() == ShaderType::PIXEL &&
529 (Info->PSInputAddr & 0x7F) == 0) {
530 Info->PSInputAddr |= 1;
531 CCInfo.AllocateReg(AMDGPU::VGPR0);
532 CCInfo.AllocateReg(AMDGPU::VGPR1);
535 // The pointer to the list of arguments is stored in SGPR0, SGPR1
536 // The pointer to the scratch buffer is stored in SGPR2, SGPR3
537 if (Info->getShaderType() == ShaderType::COMPUTE) {
538 if (Subtarget->isAmdHsaOS())
539 Info->NumUserSGPRs = 2; // FIXME: Need to support scratch buffers.
541 Info->NumUserSGPRs = 4;
543 unsigned InputPtrReg =
544 TRI->getPreloadedValue(MF, SIRegisterInfo::INPUT_PTR);
545 unsigned InputPtrRegLo =
546 TRI->getPhysRegSubReg(InputPtrReg, &AMDGPU::SReg_32RegClass, 0);
547 unsigned InputPtrRegHi =
548 TRI->getPhysRegSubReg(InputPtrReg, &AMDGPU::SReg_32RegClass, 1);
550 unsigned ScratchPtrReg =
551 TRI->getPreloadedValue(MF, SIRegisterInfo::SCRATCH_PTR);
552 unsigned ScratchPtrRegLo =
553 TRI->getPhysRegSubReg(ScratchPtrReg, &AMDGPU::SReg_32RegClass, 0);
554 unsigned ScratchPtrRegHi =
555 TRI->getPhysRegSubReg(ScratchPtrReg, &AMDGPU::SReg_32RegClass, 1);
557 CCInfo.AllocateReg(InputPtrRegLo);
558 CCInfo.AllocateReg(InputPtrRegHi);
559 CCInfo.AllocateReg(ScratchPtrRegLo);
560 CCInfo.AllocateReg(ScratchPtrRegHi);
561 MF.addLiveIn(InputPtrReg, &AMDGPU::SReg_64RegClass);
562 MF.addLiveIn(ScratchPtrReg, &AMDGPU::SReg_64RegClass);
565 if (Info->getShaderType() == ShaderType::COMPUTE) {
566 getOriginalFunctionArgs(DAG, DAG.getMachineFunction().getFunction(), Ins,
570 AnalyzeFormalArguments(CCInfo, Splits);
572 for (unsigned i = 0, e = Ins.size(), ArgIdx = 0; i != e; ++i) {
574 const ISD::InputArg &Arg = Ins[i];
576 InVals.push_back(DAG.getUNDEF(Arg.VT));
580 CCValAssign &VA = ArgLocs[ArgIdx++];
581 MVT VT = VA.getLocVT();
585 EVT MemVT = Splits[i].VT;
586 const unsigned Offset = Subtarget->getExplicitKernelArgOffset() +
587 VA.getLocMemOffset();
588 // The first 36 bytes of the input buffer contains information about
589 // thread group and global sizes.
590 SDValue Arg = LowerParameter(DAG, VT, MemVT, DL, DAG.getRoot(),
591 Offset, Ins[i].Flags.isSExt());
593 const PointerType *ParamTy =
594 dyn_cast<PointerType>(FType->getParamType(Ins[i].getOrigArgIndex()));
595 if (Subtarget->getGeneration() == AMDGPUSubtarget::SOUTHERN_ISLANDS &&
596 ParamTy && ParamTy->getAddressSpace() == AMDGPUAS::LOCAL_ADDRESS) {
597 // On SI local pointers are just offsets into LDS, so they are always
598 // less than 16-bits. On CI and newer they could potentially be
599 // real pointers, so we can't guarantee their size.
600 Arg = DAG.getNode(ISD::AssertZext, DL, Arg.getValueType(), Arg,
601 DAG.getValueType(MVT::i16));
604 InVals.push_back(Arg);
605 Info->ABIArgOffset = Offset + MemVT.getStoreSize();
608 assert(VA.isRegLoc() && "Parameter must be in a register!");
610 unsigned Reg = VA.getLocReg();
612 if (VT == MVT::i64) {
613 // For now assume it is a pointer
614 Reg = TRI->getMatchingSuperReg(Reg, AMDGPU::sub0,
615 &AMDGPU::SReg_64RegClass);
616 Reg = MF.addLiveIn(Reg, &AMDGPU::SReg_64RegClass);
617 InVals.push_back(DAG.getCopyFromReg(Chain, DL, Reg, VT));
621 const TargetRegisterClass *RC = TRI->getMinimalPhysRegClass(Reg, VT);
623 Reg = MF.addLiveIn(Reg, RC);
624 SDValue Val = DAG.getCopyFromReg(Chain, DL, Reg, VT);
626 if (Arg.VT.isVector()) {
628 // Build a vector from the registers
629 Type *ParamType = FType->getParamType(Arg.getOrigArgIndex());
630 unsigned NumElements = ParamType->getVectorNumElements();
632 SmallVector<SDValue, 4> Regs;
634 for (unsigned j = 1; j != NumElements; ++j) {
635 Reg = ArgLocs[ArgIdx++].getLocReg();
636 Reg = MF.addLiveIn(Reg, RC);
637 Regs.push_back(DAG.getCopyFromReg(Chain, DL, Reg, VT));
640 // Fill up the missing vector elements
641 NumElements = Arg.VT.getVectorNumElements() - NumElements;
642 Regs.append(NumElements, DAG.getUNDEF(VT));
644 InVals.push_back(DAG.getNode(ISD::BUILD_VECTOR, DL, Arg.VT, Regs));
648 InVals.push_back(Val);
651 if (Info->getShaderType() != ShaderType::COMPUTE) {
652 unsigned ScratchIdx = CCInfo.getFirstUnallocated(ArrayRef<MCPhysReg>(
653 AMDGPU::SGPR_32RegClass.begin(), AMDGPU::SGPR_32RegClass.getNumRegs()));
654 Info->ScratchOffsetReg = AMDGPU::SGPR_32RegClass.getRegister(ScratchIdx);
659 MachineBasicBlock * SITargetLowering::EmitInstrWithCustomInserter(
660 MachineInstr * MI, MachineBasicBlock * BB) const {
662 MachineBasicBlock::iterator I = *MI;
663 const SIInstrInfo *TII =
664 static_cast<const SIInstrInfo *>(Subtarget->getInstrInfo());
666 switch (MI->getOpcode()) {
668 return AMDGPUTargetLowering::EmitInstrWithCustomInserter(MI, BB);
671 case AMDGPU::SI_RegisterStorePseudo: {
672 MachineRegisterInfo &MRI = BB->getParent()->getRegInfo();
673 unsigned Reg = MRI.createVirtualRegister(&AMDGPU::SReg_64RegClass);
674 MachineInstrBuilder MIB =
675 BuildMI(*BB, I, MI->getDebugLoc(), TII->get(AMDGPU::SI_RegisterStore),
677 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i)
678 MIB.addOperand(MI->getOperand(i));
680 MI->eraseFromParent();
687 bool SITargetLowering::enableAggressiveFMAFusion(EVT VT) const {
688 // This currently forces unfolding various combinations of fsub into fma with
689 // free fneg'd operands. As long as we have fast FMA (controlled by
690 // isFMAFasterThanFMulAndFAdd), we should perform these.
692 // When fma is quarter rate, for f64 where add / sub are at best half rate,
693 // most of these combines appear to be cycle neutral but save on instruction
694 // count / code size.
698 EVT SITargetLowering::getSetCCResultType(const DataLayout &DL, LLVMContext &Ctx,
700 if (!VT.isVector()) {
703 return EVT::getVectorVT(Ctx, MVT::i1, VT.getVectorNumElements());
706 MVT SITargetLowering::getScalarShiftAmountTy(EVT VT) const {
710 // Answering this is somewhat tricky and depends on the specific device which
711 // have different rates for fma or all f64 operations.
713 // v_fma_f64 and v_mul_f64 always take the same number of cycles as each other
714 // regardless of which device (although the number of cycles differs between
715 // devices), so it is always profitable for f64.
717 // v_fma_f32 takes 4 or 16 cycles depending on the device, so it is profitable
718 // only on full rate devices. Normally, we should prefer selecting v_mad_f32
719 // which we can always do even without fused FP ops since it returns the same
720 // result as the separate operations and since it is always full
721 // rate. Therefore, we lie and report that it is not faster for f32. v_mad_f32
722 // however does not support denormals, so we do report fma as faster if we have
723 // a fast fma device and require denormals.
725 bool SITargetLowering::isFMAFasterThanFMulAndFAdd(EVT VT) const {
726 VT = VT.getScalarType();
731 switch (VT.getSimpleVT().SimpleTy) {
733 // This is as fast on some subtargets. However, we always have full rate f32
734 // mad available which returns the same result as the separate operations
735 // which we should prefer over fma. We can't use this if we want to support
736 // denormals, so only report this in these cases.
737 return Subtarget->hasFP32Denormals() && Subtarget->hasFastFMAF32();
747 //===----------------------------------------------------------------------===//
748 // Custom DAG Lowering Operations
749 //===----------------------------------------------------------------------===//
751 SDValue SITargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const {
752 switch (Op.getOpcode()) {
753 default: return AMDGPUTargetLowering::LowerOperation(Op, DAG);
754 case ISD::FrameIndex: return LowerFrameIndex(Op, DAG);
755 case ISD::BRCOND: return LowerBRCOND(Op, DAG);
757 SDValue Result = LowerLOAD(Op, DAG);
758 assert((!Result.getNode() ||
759 Result.getNode()->getNumValues() == 2) &&
760 "Load should return a value and a chain");
766 return LowerTrig(Op, DAG);
767 case ISD::SELECT: return LowerSELECT(Op, DAG);
768 case ISD::FDIV: return LowerFDIV(Op, DAG);
769 case ISD::STORE: return LowerSTORE(Op, DAG);
770 case ISD::GlobalAddress: {
771 MachineFunction &MF = DAG.getMachineFunction();
772 SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();
773 return LowerGlobalAddress(MFI, Op, DAG);
775 case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG);
776 case ISD::INTRINSIC_VOID: return LowerINTRINSIC_VOID(Op, DAG);
781 /// \brief Helper function for LowerBRCOND
782 static SDNode *findUser(SDValue Value, unsigned Opcode) {
784 SDNode *Parent = Value.getNode();
785 for (SDNode::use_iterator I = Parent->use_begin(), E = Parent->use_end();
788 if (I.getUse().get() != Value)
791 if (I->getOpcode() == Opcode)
797 SDValue SITargetLowering::LowerFrameIndex(SDValue Op, SelectionDAG &DAG) const {
799 FrameIndexSDNode *FINode = cast<FrameIndexSDNode>(Op);
800 unsigned FrameIndex = FINode->getIndex();
802 return DAG.getTargetFrameIndex(FrameIndex, MVT::i32);
805 /// This transforms the control flow intrinsics to get the branch destination as
806 /// last parameter, also switches branch target with BR if the need arise
807 SDValue SITargetLowering::LowerBRCOND(SDValue BRCOND,
808 SelectionDAG &DAG) const {
812 SDNode *Intr = BRCOND.getOperand(1).getNode();
813 SDValue Target = BRCOND.getOperand(2);
814 SDNode *BR = nullptr;
816 if (Intr->getOpcode() == ISD::SETCC) {
817 // As long as we negate the condition everything is fine
818 SDNode *SetCC = Intr;
819 assert(SetCC->getConstantOperandVal(1) == 1);
820 assert(cast<CondCodeSDNode>(SetCC->getOperand(2).getNode())->get() ==
822 Intr = SetCC->getOperand(0).getNode();
825 // Get the target from BR if we don't negate the condition
826 BR = findUser(BRCOND, ISD::BR);
827 Target = BR->getOperand(1);
830 assert(Intr->getOpcode() == ISD::INTRINSIC_W_CHAIN);
832 // Build the result and
833 ArrayRef<EVT> Res(Intr->value_begin() + 1, Intr->value_end());
835 // operands of the new intrinsic call
836 SmallVector<SDValue, 4> Ops;
837 Ops.push_back(BRCOND.getOperand(0));
838 Ops.append(Intr->op_begin() + 1, Intr->op_end());
839 Ops.push_back(Target);
841 // build the new intrinsic call
842 SDNode *Result = DAG.getNode(
843 Res.size() > 1 ? ISD::INTRINSIC_W_CHAIN : ISD::INTRINSIC_VOID, DL,
844 DAG.getVTList(Res), Ops).getNode();
847 // Give the branch instruction our target
852 SDValue NewBR = DAG.getNode(ISD::BR, DL, BR->getVTList(), Ops);
853 DAG.ReplaceAllUsesWith(BR, NewBR.getNode());
854 BR = NewBR.getNode();
857 SDValue Chain = SDValue(Result, Result->getNumValues() - 1);
859 // Copy the intrinsic results to registers
860 for (unsigned i = 1, e = Intr->getNumValues() - 1; i != e; ++i) {
861 SDNode *CopyToReg = findUser(SDValue(Intr, i), ISD::CopyToReg);
865 Chain = DAG.getCopyToReg(
867 CopyToReg->getOperand(1),
868 SDValue(Result, i - 1),
871 DAG.ReplaceAllUsesWith(SDValue(CopyToReg, 0), CopyToReg->getOperand(0));
874 // Remove the old intrinsic from the chain
875 DAG.ReplaceAllUsesOfValueWith(
876 SDValue(Intr, Intr->getNumValues() - 1),
877 Intr->getOperand(0));
882 SDValue SITargetLowering::LowerGlobalAddress(AMDGPUMachineFunction *MFI,
884 SelectionDAG &DAG) const {
885 GlobalAddressSDNode *GSD = cast<GlobalAddressSDNode>(Op);
887 if (GSD->getAddressSpace() != AMDGPUAS::CONSTANT_ADDRESS)
888 return AMDGPUTargetLowering::LowerGlobalAddress(MFI, Op, DAG);
891 const GlobalValue *GV = GSD->getGlobal();
892 MVT PtrVT = getPointerTy(DAG.getDataLayout(), GSD->getAddressSpace());
894 SDValue Ptr = DAG.getNode(AMDGPUISD::CONST_DATA_PTR, DL, PtrVT);
895 SDValue GA = DAG.getTargetGlobalAddress(GV, DL, MVT::i32);
897 SDValue PtrLo = DAG.getNode(ISD::EXTRACT_ELEMENT, DL, MVT::i32, Ptr,
898 DAG.getConstant(0, DL, MVT::i32));
899 SDValue PtrHi = DAG.getNode(ISD::EXTRACT_ELEMENT, DL, MVT::i32, Ptr,
900 DAG.getConstant(1, DL, MVT::i32));
902 SDValue Lo = DAG.getNode(ISD::ADDC, DL, DAG.getVTList(MVT::i32, MVT::Glue),
904 SDValue Hi = DAG.getNode(ISD::ADDE, DL, DAG.getVTList(MVT::i32, MVT::Glue),
905 PtrHi, DAG.getConstant(0, DL, MVT::i32),
906 SDValue(Lo.getNode(), 1));
907 return DAG.getNode(ISD::BUILD_PAIR, DL, MVT::i64, Lo, Hi);
910 SDValue SITargetLowering::copyToM0(SelectionDAG &DAG, SDValue Chain, SDLoc DL,
912 // We can't use CopyToReg, because MachineCSE won't combine COPY instructions,
913 // so we will end up with redundant moves to m0.
915 // We can't use S_MOV_B32, because there is no way to specify m0 as the
916 // destination register.
918 // We have to use them both. Machine cse will combine all the S_MOV_B32
919 // instructions and the register coalescer eliminate the extra copies.
920 SDNode *M0 = DAG.getMachineNode(AMDGPU::S_MOV_B32, DL, V.getValueType(), V);
921 return DAG.getCopyToReg(Chain, DL, DAG.getRegister(AMDGPU::M0, MVT::i32),
922 SDValue(M0, 0), SDValue()); // Glue
923 // A Null SDValue creates
927 SDValue SITargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op,
928 SelectionDAG &DAG) const {
929 MachineFunction &MF = DAG.getMachineFunction();
930 const SIRegisterInfo *TRI =
931 static_cast<const SIRegisterInfo *>(Subtarget->getRegisterInfo());
933 EVT VT = Op.getValueType();
935 unsigned IntrinsicID = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
937 switch (IntrinsicID) {
938 case Intrinsic::r600_read_ngroups_x:
939 return LowerParameter(DAG, VT, VT, DL, DAG.getEntryNode(),
940 SI::KernelInputOffsets::NGROUPS_X, false);
941 case Intrinsic::r600_read_ngroups_y:
942 return LowerParameter(DAG, VT, VT, DL, DAG.getEntryNode(),
943 SI::KernelInputOffsets::NGROUPS_Y, false);
944 case Intrinsic::r600_read_ngroups_z:
945 return LowerParameter(DAG, VT, VT, DL, DAG.getEntryNode(),
946 SI::KernelInputOffsets::NGROUPS_Z, false);
947 case Intrinsic::r600_read_global_size_x:
948 return LowerParameter(DAG, VT, VT, DL, DAG.getEntryNode(),
949 SI::KernelInputOffsets::GLOBAL_SIZE_X, false);
950 case Intrinsic::r600_read_global_size_y:
951 return LowerParameter(DAG, VT, VT, DL, DAG.getEntryNode(),
952 SI::KernelInputOffsets::GLOBAL_SIZE_Y, false);
953 case Intrinsic::r600_read_global_size_z:
954 return LowerParameter(DAG, VT, VT, DL, DAG.getEntryNode(),
955 SI::KernelInputOffsets::GLOBAL_SIZE_Z, false);
956 case Intrinsic::r600_read_local_size_x:
957 return LowerParameter(DAG, VT, VT, DL, DAG.getEntryNode(),
958 SI::KernelInputOffsets::LOCAL_SIZE_X, false);
959 case Intrinsic::r600_read_local_size_y:
960 return LowerParameter(DAG, VT, VT, DL, DAG.getEntryNode(),
961 SI::KernelInputOffsets::LOCAL_SIZE_Y, false);
962 case Intrinsic::r600_read_local_size_z:
963 return LowerParameter(DAG, VT, VT, DL, DAG.getEntryNode(),
964 SI::KernelInputOffsets::LOCAL_SIZE_Z, false);
966 case Intrinsic::AMDGPU_read_workdim:
967 return LowerParameter(DAG, VT, VT, DL, DAG.getEntryNode(),
968 MF.getInfo<SIMachineFunctionInfo>()->ABIArgOffset,
971 case Intrinsic::r600_read_tgid_x:
972 return CreateLiveInRegister(DAG, &AMDGPU::SReg_32RegClass,
973 TRI->getPreloadedValue(MF, SIRegisterInfo::TGID_X), VT);
974 case Intrinsic::r600_read_tgid_y:
975 return CreateLiveInRegister(DAG, &AMDGPU::SReg_32RegClass,
976 TRI->getPreloadedValue(MF, SIRegisterInfo::TGID_Y), VT);
977 case Intrinsic::r600_read_tgid_z:
978 return CreateLiveInRegister(DAG, &AMDGPU::SReg_32RegClass,
979 TRI->getPreloadedValue(MF, SIRegisterInfo::TGID_Z), VT);
980 case Intrinsic::r600_read_tidig_x:
981 return CreateLiveInRegister(DAG, &AMDGPU::VGPR_32RegClass,
982 TRI->getPreloadedValue(MF, SIRegisterInfo::TIDIG_X), VT);
983 case Intrinsic::r600_read_tidig_y:
984 return CreateLiveInRegister(DAG, &AMDGPU::VGPR_32RegClass,
985 TRI->getPreloadedValue(MF, SIRegisterInfo::TIDIG_Y), VT);
986 case Intrinsic::r600_read_tidig_z:
987 return CreateLiveInRegister(DAG, &AMDGPU::VGPR_32RegClass,
988 TRI->getPreloadedValue(MF, SIRegisterInfo::TIDIG_Z), VT);
989 case AMDGPUIntrinsic::SI_load_const: {
995 MachineMemOperand *MMO = MF.getMachineMemOperand(
996 MachinePointerInfo(),
997 MachineMemOperand::MOLoad | MachineMemOperand::MOInvariant,
998 VT.getStoreSize(), 4);
999 return DAG.getMemIntrinsicNode(AMDGPUISD::LOAD_CONSTANT, DL,
1000 Op->getVTList(), Ops, VT, MMO);
1002 case AMDGPUIntrinsic::SI_sample:
1003 return LowerSampleIntrinsic(AMDGPUISD::SAMPLE, Op, DAG);
1004 case AMDGPUIntrinsic::SI_sampleb:
1005 return LowerSampleIntrinsic(AMDGPUISD::SAMPLEB, Op, DAG);
1006 case AMDGPUIntrinsic::SI_sampled:
1007 return LowerSampleIntrinsic(AMDGPUISD::SAMPLED, Op, DAG);
1008 case AMDGPUIntrinsic::SI_samplel:
1009 return LowerSampleIntrinsic(AMDGPUISD::SAMPLEL, Op, DAG);
1010 case AMDGPUIntrinsic::SI_vs_load_input:
1011 return DAG.getNode(AMDGPUISD::LOAD_INPUT, DL, VT,
1016 case AMDGPUIntrinsic::AMDGPU_fract:
1017 case AMDGPUIntrinsic::AMDIL_fraction: // Legacy name.
1018 return DAG.getNode(ISD::FSUB, DL, VT, Op.getOperand(1),
1019 DAG.getNode(ISD::FFLOOR, DL, VT, Op.getOperand(1)));
1020 case AMDGPUIntrinsic::SI_fs_constant: {
1021 SDValue M0 = copyToM0(DAG, DAG.getEntryNode(), DL, Op.getOperand(3));
1022 SDValue Glue = M0.getValue(1);
1023 return DAG.getNode(AMDGPUISD::INTERP_MOV, DL, MVT::f32,
1024 DAG.getConstant(2, DL, MVT::i32), // P0
1025 Op.getOperand(1), Op.getOperand(2), Glue);
1027 case AMDGPUIntrinsic::SI_fs_interp: {
1028 SDValue IJ = Op.getOperand(4);
1029 SDValue I = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MVT::i32, IJ,
1030 DAG.getConstant(0, DL, MVT::i32));
1031 SDValue J = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MVT::i32, IJ,
1032 DAG.getConstant(1, DL, MVT::i32));
1033 SDValue M0 = copyToM0(DAG, DAG.getEntryNode(), DL, Op.getOperand(3));
1034 SDValue Glue = M0.getValue(1);
1035 SDValue P1 = DAG.getNode(AMDGPUISD::INTERP_P1, DL,
1036 DAG.getVTList(MVT::f32, MVT::Glue),
1037 I, Op.getOperand(1), Op.getOperand(2), Glue);
1038 Glue = SDValue(P1.getNode(), 1);
1039 return DAG.getNode(AMDGPUISD::INTERP_P2, DL, MVT::f32, P1, J,
1040 Op.getOperand(1), Op.getOperand(2), Glue);
1043 return AMDGPUTargetLowering::LowerOperation(Op, DAG);
1047 SDValue SITargetLowering::LowerINTRINSIC_VOID(SDValue Op,
1048 SelectionDAG &DAG) const {
1049 MachineFunction &MF = DAG.getMachineFunction();
1051 SDValue Chain = Op.getOperand(0);
1052 unsigned IntrinsicID = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
1054 switch (IntrinsicID) {
1055 case AMDGPUIntrinsic::SI_sendmsg: {
1056 Chain = copyToM0(DAG, Chain, DL, Op.getOperand(3));
1057 SDValue Glue = Chain.getValue(1);
1058 return DAG.getNode(AMDGPUISD::SENDMSG, DL, MVT::Other, Chain,
1059 Op.getOperand(2), Glue);
1061 case AMDGPUIntrinsic::SI_tbuffer_store: {
1079 EVT VT = Op.getOperand(3).getValueType();
1081 MachineMemOperand *MMO = MF.getMachineMemOperand(
1082 MachinePointerInfo(),
1083 MachineMemOperand::MOStore,
1084 VT.getStoreSize(), 4);
1085 return DAG.getMemIntrinsicNode(AMDGPUISD::TBUFFER_STORE_FORMAT, DL,
1086 Op->getVTList(), Ops, VT, MMO);
1093 SDValue SITargetLowering::LowerLOAD(SDValue Op, SelectionDAG &DAG) const {
1095 LoadSDNode *Load = cast<LoadSDNode>(Op);
1097 if (Op.getValueType().isVector()) {
1098 assert(Op.getValueType().getVectorElementType() == MVT::i32 &&
1099 "Custom lowering for non-i32 vectors hasn't been implemented.");
1100 unsigned NumElements = Op.getValueType().getVectorNumElements();
1101 assert(NumElements != 2 && "v2 loads are supported for all address spaces.");
1102 switch (Load->getAddressSpace()) {
1104 case AMDGPUAS::GLOBAL_ADDRESS:
1105 case AMDGPUAS::PRIVATE_ADDRESS:
1106 // v4 loads are supported for private and global memory.
1107 if (NumElements <= 4)
1110 case AMDGPUAS::LOCAL_ADDRESS:
1111 return ScalarizeVectorLoad(Op, DAG);
1115 return AMDGPUTargetLowering::LowerLOAD(Op, DAG);
1118 SDValue SITargetLowering::LowerSampleIntrinsic(unsigned Opcode,
1120 SelectionDAG &DAG) const {
1121 return DAG.getNode(Opcode, SDLoc(Op), Op.getValueType(), Op.getOperand(1),
1127 SDValue SITargetLowering::LowerSELECT(SDValue Op, SelectionDAG &DAG) const {
1128 if (Op.getValueType() != MVT::i64)
1132 SDValue Cond = Op.getOperand(0);
1134 SDValue Zero = DAG.getConstant(0, DL, MVT::i32);
1135 SDValue One = DAG.getConstant(1, DL, MVT::i32);
1137 SDValue LHS = DAG.getNode(ISD::BITCAST, DL, MVT::v2i32, Op.getOperand(1));
1138 SDValue RHS = DAG.getNode(ISD::BITCAST, DL, MVT::v2i32, Op.getOperand(2));
1140 SDValue Lo0 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MVT::i32, LHS, Zero);
1141 SDValue Lo1 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MVT::i32, RHS, Zero);
1143 SDValue Lo = DAG.getSelect(DL, MVT::i32, Cond, Lo0, Lo1);
1145 SDValue Hi0 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MVT::i32, LHS, One);
1146 SDValue Hi1 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MVT::i32, RHS, One);
1148 SDValue Hi = DAG.getSelect(DL, MVT::i32, Cond, Hi0, Hi1);
1150 SDValue Res = DAG.getNode(ISD::BUILD_VECTOR, DL, MVT::v2i32, Lo, Hi);
1151 return DAG.getNode(ISD::BITCAST, DL, MVT::i64, Res);
1154 // Catch division cases where we can use shortcuts with rcp and rsq
1156 SDValue SITargetLowering::LowerFastFDIV(SDValue Op, SelectionDAG &DAG) const {
1158 SDValue LHS = Op.getOperand(0);
1159 SDValue RHS = Op.getOperand(1);
1160 EVT VT = Op.getValueType();
1161 bool Unsafe = DAG.getTarget().Options.UnsafeFPMath;
1163 if (const ConstantFPSDNode *CLHS = dyn_cast<ConstantFPSDNode>(LHS)) {
1164 if ((Unsafe || (VT == MVT::f32 && !Subtarget->hasFP32Denormals())) &&
1165 CLHS->isExactlyValue(1.0)) {
1166 // v_rcp_f32 and v_rsq_f32 do not support denormals, and according to
1167 // the CI documentation has a worst case error of 1 ulp.
1168 // OpenCL requires <= 2.5 ulp for 1.0 / x, so it should always be OK to
1169 // use it as long as we aren't trying to use denormals.
1171 // 1.0 / sqrt(x) -> rsq(x)
1173 // XXX - Is UnsafeFPMath sufficient to do this for f64? The maximum ULP
1174 // error seems really high at 2^29 ULP.
1175 if (RHS.getOpcode() == ISD::FSQRT)
1176 return DAG.getNode(AMDGPUISD::RSQ, SL, VT, RHS.getOperand(0));
1178 // 1.0 / x -> rcp(x)
1179 return DAG.getNode(AMDGPUISD::RCP, SL, VT, RHS);
1184 // Turn into multiply by the reciprocal.
1185 // x / y -> x * (1.0 / y)
1186 SDValue Recip = DAG.getNode(AMDGPUISD::RCP, SL, VT, RHS);
1187 return DAG.getNode(ISD::FMUL, SL, VT, LHS, Recip);
1193 SDValue SITargetLowering::LowerFDIV32(SDValue Op, SelectionDAG &DAG) const {
1194 SDValue FastLowered = LowerFastFDIV(Op, DAG);
1195 if (FastLowered.getNode())
1198 // This uses v_rcp_f32 which does not handle denormals. Let this hit a
1199 // selection error for now rather than do something incorrect.
1200 if (Subtarget->hasFP32Denormals())
1204 SDValue LHS = Op.getOperand(0);
1205 SDValue RHS = Op.getOperand(1);
1207 SDValue r1 = DAG.getNode(ISD::FABS, SL, MVT::f32, RHS);
1209 const APFloat K0Val(BitsToFloat(0x6f800000));
1210 const SDValue K0 = DAG.getConstantFP(K0Val, SL, MVT::f32);
1212 const APFloat K1Val(BitsToFloat(0x2f800000));
1213 const SDValue K1 = DAG.getConstantFP(K1Val, SL, MVT::f32);
1215 const SDValue One = DAG.getConstantFP(1.0, SL, MVT::f32);
1218 getSetCCResultType(DAG.getDataLayout(), *DAG.getContext(), MVT::f32);
1220 SDValue r2 = DAG.getSetCC(SL, SetCCVT, r1, K0, ISD::SETOGT);
1222 SDValue r3 = DAG.getNode(ISD::SELECT, SL, MVT::f32, r2, K1, One);
1224 r1 = DAG.getNode(ISD::FMUL, SL, MVT::f32, RHS, r3);
1226 SDValue r0 = DAG.getNode(AMDGPUISD::RCP, SL, MVT::f32, r1);
1228 SDValue Mul = DAG.getNode(ISD::FMUL, SL, MVT::f32, LHS, r0);
1230 return DAG.getNode(ISD::FMUL, SL, MVT::f32, r3, Mul);
1233 SDValue SITargetLowering::LowerFDIV64(SDValue Op, SelectionDAG &DAG) const {
1234 if (DAG.getTarget().Options.UnsafeFPMath)
1235 return LowerFastFDIV(Op, DAG);
1238 SDValue X = Op.getOperand(0);
1239 SDValue Y = Op.getOperand(1);
1241 const SDValue One = DAG.getConstantFP(1.0, SL, MVT::f64);
1243 SDVTList ScaleVT = DAG.getVTList(MVT::f64, MVT::i1);
1245 SDValue DivScale0 = DAG.getNode(AMDGPUISD::DIV_SCALE, SL, ScaleVT, Y, Y, X);
1247 SDValue NegDivScale0 = DAG.getNode(ISD::FNEG, SL, MVT::f64, DivScale0);
1249 SDValue Rcp = DAG.getNode(AMDGPUISD::RCP, SL, MVT::f64, DivScale0);
1251 SDValue Fma0 = DAG.getNode(ISD::FMA, SL, MVT::f64, NegDivScale0, Rcp, One);
1253 SDValue Fma1 = DAG.getNode(ISD::FMA, SL, MVT::f64, Rcp, Fma0, Rcp);
1255 SDValue Fma2 = DAG.getNode(ISD::FMA, SL, MVT::f64, NegDivScale0, Fma1, One);
1257 SDValue DivScale1 = DAG.getNode(AMDGPUISD::DIV_SCALE, SL, ScaleVT, X, Y, X);
1259 SDValue Fma3 = DAG.getNode(ISD::FMA, SL, MVT::f64, Fma1, Fma2, Fma1);
1260 SDValue Mul = DAG.getNode(ISD::FMUL, SL, MVT::f64, DivScale1, Fma3);
1262 SDValue Fma4 = DAG.getNode(ISD::FMA, SL, MVT::f64,
1263 NegDivScale0, Mul, DivScale1);
1267 if (Subtarget->getGeneration() == AMDGPUSubtarget::SOUTHERN_ISLANDS) {
1268 // Workaround a hardware bug on SI where the condition output from div_scale
1271 const SDValue Hi = DAG.getConstant(1, SL, MVT::i32);
1273 // Figure out if the scale to use for div_fmas.
1274 SDValue NumBC = DAG.getNode(ISD::BITCAST, SL, MVT::v2i32, X);
1275 SDValue DenBC = DAG.getNode(ISD::BITCAST, SL, MVT::v2i32, Y);
1276 SDValue Scale0BC = DAG.getNode(ISD::BITCAST, SL, MVT::v2i32, DivScale0);
1277 SDValue Scale1BC = DAG.getNode(ISD::BITCAST, SL, MVT::v2i32, DivScale1);
1279 SDValue NumHi = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, SL, MVT::i32, NumBC, Hi);
1280 SDValue DenHi = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, SL, MVT::i32, DenBC, Hi);
1283 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, SL, MVT::i32, Scale0BC, Hi);
1285 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, SL, MVT::i32, Scale1BC, Hi);
1287 SDValue CmpDen = DAG.getSetCC(SL, MVT::i1, DenHi, Scale0Hi, ISD::SETEQ);
1288 SDValue CmpNum = DAG.getSetCC(SL, MVT::i1, NumHi, Scale1Hi, ISD::SETEQ);
1289 Scale = DAG.getNode(ISD::XOR, SL, MVT::i1, CmpNum, CmpDen);
1291 Scale = DivScale1.getValue(1);
1294 SDValue Fmas = DAG.getNode(AMDGPUISD::DIV_FMAS, SL, MVT::f64,
1295 Fma4, Fma3, Mul, Scale);
1297 return DAG.getNode(AMDGPUISD::DIV_FIXUP, SL, MVT::f64, Fmas, Y, X);
1300 SDValue SITargetLowering::LowerFDIV(SDValue Op, SelectionDAG &DAG) const {
1301 EVT VT = Op.getValueType();
1304 return LowerFDIV32(Op, DAG);
1307 return LowerFDIV64(Op, DAG);
1309 llvm_unreachable("Unexpected type for fdiv");
1312 SDValue SITargetLowering::LowerSTORE(SDValue Op, SelectionDAG &DAG) const {
1314 StoreSDNode *Store = cast<StoreSDNode>(Op);
1315 EVT VT = Store->getMemoryVT();
1317 // These stores are legal.
1318 if (Store->getAddressSpace() == AMDGPUAS::PRIVATE_ADDRESS) {
1319 if (VT.isVector() && VT.getVectorNumElements() > 4)
1320 return ScalarizeVectorStore(Op, DAG);
1324 SDValue Ret = AMDGPUTargetLowering::LowerSTORE(Op, DAG);
1328 if (VT.isVector() && VT.getVectorNumElements() >= 8)
1329 return ScalarizeVectorStore(Op, DAG);
1332 return DAG.getTruncStore(Store->getChain(), DL,
1333 DAG.getSExtOrTrunc(Store->getValue(), DL, MVT::i32),
1334 Store->getBasePtr(), MVT::i1, Store->getMemOperand());
1339 SDValue SITargetLowering::LowerTrig(SDValue Op, SelectionDAG &DAG) const {
1341 EVT VT = Op.getValueType();
1342 SDValue Arg = Op.getOperand(0);
1343 SDValue FractPart = DAG.getNode(AMDGPUISD::FRACT, DL, VT,
1344 DAG.getNode(ISD::FMUL, DL, VT, Arg,
1345 DAG.getConstantFP(0.5/M_PI, DL,
1348 switch (Op.getOpcode()) {
1350 return DAG.getNode(AMDGPUISD::COS_HW, SDLoc(Op), VT, FractPart);
1352 return DAG.getNode(AMDGPUISD::SIN_HW, SDLoc(Op), VT, FractPart);
1354 llvm_unreachable("Wrong trig opcode");
1358 //===----------------------------------------------------------------------===//
1359 // Custom DAG optimizations
1360 //===----------------------------------------------------------------------===//
1362 SDValue SITargetLowering::performUCharToFloatCombine(SDNode *N,
1363 DAGCombinerInfo &DCI) const {
1364 EVT VT = N->getValueType(0);
1365 EVT ScalarVT = VT.getScalarType();
1366 if (ScalarVT != MVT::f32)
1369 SelectionDAG &DAG = DCI.DAG;
1372 SDValue Src = N->getOperand(0);
1373 EVT SrcVT = Src.getValueType();
1375 // TODO: We could try to match extracting the higher bytes, which would be
1376 // easier if i8 vectors weren't promoted to i32 vectors, particularly after
1377 // types are legalized. v4i8 -> v4f32 is probably the only case to worry
1378 // about in practice.
1379 if (DCI.isAfterLegalizeVectorOps() && SrcVT == MVT::i32) {
1380 if (DAG.MaskedValueIsZero(Src, APInt::getHighBitsSet(32, 24))) {
1381 SDValue Cvt = DAG.getNode(AMDGPUISD::CVT_F32_UBYTE0, DL, VT, Src);
1382 DCI.AddToWorklist(Cvt.getNode());
1387 // We are primarily trying to catch operations on illegal vector types
1388 // before they are expanded.
1389 // For scalars, we can use the more flexible method of checking masked bits
1390 // after legalization.
1391 if (!DCI.isBeforeLegalize() ||
1392 !SrcVT.isVector() ||
1393 SrcVT.getVectorElementType() != MVT::i8) {
1397 assert(DCI.isBeforeLegalize() && "Unexpected legal type");
1399 // Weird sized vectors are a pain to handle, but we know 3 is really the same
1401 unsigned NElts = SrcVT.getVectorNumElements();
1402 if (!SrcVT.isSimple() && NElts != 3)
1405 // Handle v4i8 -> v4f32 extload. Replace the v4i8 with a legal i32 load to
1406 // prevent a mess from expanding to v4i32 and repacking.
1407 if (ISD::isNormalLoad(Src.getNode()) && Src.hasOneUse()) {
1408 EVT LoadVT = getEquivalentMemType(*DAG.getContext(), SrcVT);
1409 EVT RegVT = getEquivalentLoadRegType(*DAG.getContext(), SrcVT);
1410 EVT FloatVT = EVT::getVectorVT(*DAG.getContext(), MVT::f32, NElts);
1411 LoadSDNode *Load = cast<LoadSDNode>(Src);
1413 unsigned AS = Load->getAddressSpace();
1414 unsigned Align = Load->getAlignment();
1415 Type *Ty = LoadVT.getTypeForEVT(*DAG.getContext());
1416 unsigned ABIAlignment = getDataLayout()->getABITypeAlignment(Ty);
1418 // Don't try to replace the load if we have to expand it due to alignment
1419 // problems. Otherwise we will end up scalarizing the load, and trying to
1420 // repack into the vector for no real reason.
1421 if (Align < ABIAlignment &&
1422 !allowsMisalignedMemoryAccesses(LoadVT, AS, Align, nullptr)) {
1426 SDValue NewLoad = DAG.getExtLoad(ISD::ZEXTLOAD, DL, RegVT,
1430 Load->getMemOperand());
1432 // Make sure successors of the original load stay after it by updating
1433 // them to use the new Chain.
1434 DAG.ReplaceAllUsesOfValueWith(SDValue(Load, 1), NewLoad.getValue(1));
1436 SmallVector<SDValue, 4> Elts;
1437 if (RegVT.isVector())
1438 DAG.ExtractVectorElements(NewLoad, Elts);
1440 Elts.push_back(NewLoad);
1442 SmallVector<SDValue, 4> Ops;
1444 unsigned EltIdx = 0;
1445 for (SDValue Elt : Elts) {
1446 unsigned ComponentsInElt = std::min(4u, NElts - 4 * EltIdx);
1447 for (unsigned I = 0; I < ComponentsInElt; ++I) {
1448 unsigned Opc = AMDGPUISD::CVT_F32_UBYTE0 + I;
1449 SDValue Cvt = DAG.getNode(Opc, DL, MVT::f32, Elt);
1450 DCI.AddToWorklist(Cvt.getNode());
1457 assert(Ops.size() == NElts);
1459 return DAG.getNode(ISD::BUILD_VECTOR, DL, FloatVT, Ops);
1465 /// \brief Return true if the given offset Size in bytes can be folded into
1466 /// the immediate offsets of a memory instruction for the given address space.
1467 static bool canFoldOffset(unsigned OffsetSize, unsigned AS,
1468 const AMDGPUSubtarget &STI) {
1470 case AMDGPUAS::GLOBAL_ADDRESS: {
1471 // MUBUF instructions a 12-bit offset in bytes.
1472 return isUInt<12>(OffsetSize);
1474 case AMDGPUAS::CONSTANT_ADDRESS: {
1475 // SMRD instructions have an 8-bit offset in dwords on SI and
1476 // a 20-bit offset in bytes on VI.
1477 if (STI.getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS)
1478 return isUInt<20>(OffsetSize);
1480 return (OffsetSize % 4 == 0) && isUInt<8>(OffsetSize / 4);
1482 case AMDGPUAS::LOCAL_ADDRESS:
1483 case AMDGPUAS::REGION_ADDRESS: {
1484 // The single offset versions have a 16-bit offset in bytes.
1485 return isUInt<16>(OffsetSize);
1487 case AMDGPUAS::PRIVATE_ADDRESS:
1488 // Indirect register addressing does not use any offsets.
1494 // (shl (add x, c1), c2) -> add (shl x, c2), (shl c1, c2)
1496 // This is a variant of
1497 // (mul (add x, c1), c2) -> add (mul x, c2), (mul c1, c2),
1499 // The normal DAG combiner will do this, but only if the add has one use since
1500 // that would increase the number of instructions.
1502 // This prevents us from seeing a constant offset that can be folded into a
1503 // memory instruction's addressing mode. If we know the resulting add offset of
1504 // a pointer can be folded into an addressing offset, we can replace the pointer
1505 // operand with the add of new constant offset. This eliminates one of the uses,
1506 // and may allow the remaining use to also be simplified.
1508 SDValue SITargetLowering::performSHLPtrCombine(SDNode *N,
1510 DAGCombinerInfo &DCI) const {
1511 SDValue N0 = N->getOperand(0);
1512 SDValue N1 = N->getOperand(1);
1514 if (N0.getOpcode() != ISD::ADD)
1517 const ConstantSDNode *CN1 = dyn_cast<ConstantSDNode>(N1);
1521 const ConstantSDNode *CAdd = dyn_cast<ConstantSDNode>(N0.getOperand(1));
1525 // If the resulting offset is too large, we can't fold it into the addressing
1527 APInt Offset = CAdd->getAPIntValue() << CN1->getAPIntValue();
1528 if (!canFoldOffset(Offset.getZExtValue(), AddrSpace, *Subtarget))
1531 SelectionDAG &DAG = DCI.DAG;
1533 EVT VT = N->getValueType(0);
1535 SDValue ShlX = DAG.getNode(ISD::SHL, SL, VT, N0.getOperand(0), N1);
1536 SDValue COffset = DAG.getConstant(Offset, SL, MVT::i32);
1538 return DAG.getNode(ISD::ADD, SL, VT, ShlX, COffset);
1541 SDValue SITargetLowering::performAndCombine(SDNode *N,
1542 DAGCombinerInfo &DCI) const {
1543 if (DCI.isBeforeLegalize())
1546 SelectionDAG &DAG = DCI.DAG;
1548 // (and (fcmp ord x, x), (fcmp une (fabs x), inf)) ->
1549 // fp_class x, ~(s_nan | q_nan | n_infinity | p_infinity)
1550 SDValue LHS = N->getOperand(0);
1551 SDValue RHS = N->getOperand(1);
1553 if (LHS.getOpcode() == ISD::SETCC &&
1554 RHS.getOpcode() == ISD::SETCC) {
1555 ISD::CondCode LCC = cast<CondCodeSDNode>(LHS.getOperand(2))->get();
1556 ISD::CondCode RCC = cast<CondCodeSDNode>(RHS.getOperand(2))->get();
1558 SDValue X = LHS.getOperand(0);
1559 SDValue Y = RHS.getOperand(0);
1560 if (Y.getOpcode() != ISD::FABS || Y.getOperand(0) != X)
1563 if (LCC == ISD::SETO) {
1564 if (X != LHS.getOperand(1))
1567 if (RCC == ISD::SETUNE) {
1568 const ConstantFPSDNode *C1 = dyn_cast<ConstantFPSDNode>(RHS.getOperand(1));
1569 if (!C1 || !C1->isInfinity() || C1->isNegative())
1572 const uint32_t Mask = SIInstrFlags::N_NORMAL |
1573 SIInstrFlags::N_SUBNORMAL |
1574 SIInstrFlags::N_ZERO |
1575 SIInstrFlags::P_ZERO |
1576 SIInstrFlags::P_SUBNORMAL |
1577 SIInstrFlags::P_NORMAL;
1579 static_assert(((~(SIInstrFlags::S_NAN |
1580 SIInstrFlags::Q_NAN |
1581 SIInstrFlags::N_INFINITY |
1582 SIInstrFlags::P_INFINITY)) & 0x3ff) == Mask,
1586 return DAG.getNode(AMDGPUISD::FP_CLASS, DL, MVT::i1,
1587 X, DAG.getConstant(Mask, DL, MVT::i32));
1595 SDValue SITargetLowering::performOrCombine(SDNode *N,
1596 DAGCombinerInfo &DCI) const {
1597 SelectionDAG &DAG = DCI.DAG;
1598 SDValue LHS = N->getOperand(0);
1599 SDValue RHS = N->getOperand(1);
1601 // or (fp_class x, c1), (fp_class x, c2) -> fp_class x, (c1 | c2)
1602 if (LHS.getOpcode() == AMDGPUISD::FP_CLASS &&
1603 RHS.getOpcode() == AMDGPUISD::FP_CLASS) {
1604 SDValue Src = LHS.getOperand(0);
1605 if (Src != RHS.getOperand(0))
1608 const ConstantSDNode *CLHS = dyn_cast<ConstantSDNode>(LHS.getOperand(1));
1609 const ConstantSDNode *CRHS = dyn_cast<ConstantSDNode>(RHS.getOperand(1));
1613 // Only 10 bits are used.
1614 static const uint32_t MaxMask = 0x3ff;
1616 uint32_t NewMask = (CLHS->getZExtValue() | CRHS->getZExtValue()) & MaxMask;
1618 return DAG.getNode(AMDGPUISD::FP_CLASS, DL, MVT::i1,
1619 Src, DAG.getConstant(NewMask, DL, MVT::i32));
1625 SDValue SITargetLowering::performClassCombine(SDNode *N,
1626 DAGCombinerInfo &DCI) const {
1627 SelectionDAG &DAG = DCI.DAG;
1628 SDValue Mask = N->getOperand(1);
1630 // fp_class x, 0 -> false
1631 if (const ConstantSDNode *CMask = dyn_cast<ConstantSDNode>(Mask)) {
1632 if (CMask->isNullValue())
1633 return DAG.getConstant(0, SDLoc(N), MVT::i1);
1639 static unsigned minMaxOpcToMin3Max3Opc(unsigned Opc) {
1642 return AMDGPUISD::FMAX3;
1644 return AMDGPUISD::SMAX3;
1646 return AMDGPUISD::UMAX3;
1648 return AMDGPUISD::FMIN3;
1650 return AMDGPUISD::SMIN3;
1652 return AMDGPUISD::UMIN3;
1654 llvm_unreachable("Not a min/max opcode");
1658 SDValue SITargetLowering::performMin3Max3Combine(SDNode *N,
1659 DAGCombinerInfo &DCI) const {
1660 SelectionDAG &DAG = DCI.DAG;
1662 unsigned Opc = N->getOpcode();
1663 SDValue Op0 = N->getOperand(0);
1664 SDValue Op1 = N->getOperand(1);
1666 // Only do this if the inner op has one use since this will just increases
1667 // register pressure for no benefit.
1669 // max(max(a, b), c)
1670 if (Op0.getOpcode() == Opc && Op0.hasOneUse()) {
1672 return DAG.getNode(minMaxOpcToMin3Max3Opc(Opc),
1680 // max(a, max(b, c))
1681 if (Op1.getOpcode() == Opc && Op1.hasOneUse()) {
1683 return DAG.getNode(minMaxOpcToMin3Max3Opc(Opc),
1694 SDValue SITargetLowering::performSetCCCombine(SDNode *N,
1695 DAGCombinerInfo &DCI) const {
1696 SelectionDAG &DAG = DCI.DAG;
1699 SDValue LHS = N->getOperand(0);
1700 SDValue RHS = N->getOperand(1);
1701 EVT VT = LHS.getValueType();
1703 if (VT != MVT::f32 && VT != MVT::f64)
1706 // Match isinf pattern
1707 // (fcmp oeq (fabs x), inf) -> (fp_class x, (p_infinity | n_infinity))
1708 ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(2))->get();
1709 if (CC == ISD::SETOEQ && LHS.getOpcode() == ISD::FABS) {
1710 const ConstantFPSDNode *CRHS = dyn_cast<ConstantFPSDNode>(RHS);
1714 const APFloat &APF = CRHS->getValueAPF();
1715 if (APF.isInfinity() && !APF.isNegative()) {
1716 unsigned Mask = SIInstrFlags::P_INFINITY | SIInstrFlags::N_INFINITY;
1717 return DAG.getNode(AMDGPUISD::FP_CLASS, SL, MVT::i1, LHS.getOperand(0),
1718 DAG.getConstant(Mask, SL, MVT::i32));
1725 SDValue SITargetLowering::PerformDAGCombine(SDNode *N,
1726 DAGCombinerInfo &DCI) const {
1727 SelectionDAG &DAG = DCI.DAG;
1730 switch (N->getOpcode()) {
1732 return AMDGPUTargetLowering::PerformDAGCombine(N, DCI);
1734 return performSetCCCombine(N, DCI);
1735 case ISD::FMAXNUM: // TODO: What about fmax_legacy?
1741 if (DCI.getDAGCombineLevel() >= AfterLegalizeDAG &&
1742 N->getValueType(0) != MVT::f64 &&
1743 getTargetMachine().getOptLevel() > CodeGenOpt::None)
1744 return performMin3Max3Combine(N, DCI);
1748 case AMDGPUISD::CVT_F32_UBYTE0:
1749 case AMDGPUISD::CVT_F32_UBYTE1:
1750 case AMDGPUISD::CVT_F32_UBYTE2:
1751 case AMDGPUISD::CVT_F32_UBYTE3: {
1752 unsigned Offset = N->getOpcode() - AMDGPUISD::CVT_F32_UBYTE0;
1754 SDValue Src = N->getOperand(0);
1755 APInt Demanded = APInt::getBitsSet(32, 8 * Offset, 8 * Offset + 8);
1757 APInt KnownZero, KnownOne;
1758 TargetLowering::TargetLoweringOpt TLO(DAG, !DCI.isBeforeLegalize(),
1759 !DCI.isBeforeLegalizeOps());
1760 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
1761 if (TLO.ShrinkDemandedConstant(Src, Demanded) ||
1762 TLI.SimplifyDemandedBits(Src, Demanded, KnownZero, KnownOne, TLO)) {
1763 DCI.CommitTargetLoweringOpt(TLO);
1769 case ISD::UINT_TO_FP: {
1770 return performUCharToFloatCombine(N, DCI);
1773 if (DCI.getDAGCombineLevel() < AfterLegalizeDAG)
1776 EVT VT = N->getValueType(0);
1780 // Only do this if we are not trying to support denormals. v_mad_f32 does
1781 // not support denormals ever.
1782 if (Subtarget->hasFP32Denormals())
1785 SDValue LHS = N->getOperand(0);
1786 SDValue RHS = N->getOperand(1);
1788 // These should really be instruction patterns, but writing patterns with
1789 // source modiifiers is a pain.
1791 // fadd (fadd (a, a), b) -> mad 2.0, a, b
1792 if (LHS.getOpcode() == ISD::FADD) {
1793 SDValue A = LHS.getOperand(0);
1794 if (A == LHS.getOperand(1)) {
1795 const SDValue Two = DAG.getConstantFP(2.0, DL, MVT::f32);
1796 return DAG.getNode(ISD::FMAD, DL, VT, Two, A, RHS);
1800 // fadd (b, fadd (a, a)) -> mad 2.0, a, b
1801 if (RHS.getOpcode() == ISD::FADD) {
1802 SDValue A = RHS.getOperand(0);
1803 if (A == RHS.getOperand(1)) {
1804 const SDValue Two = DAG.getConstantFP(2.0, DL, MVT::f32);
1805 return DAG.getNode(ISD::FMAD, DL, VT, Two, A, LHS);
1812 if (DCI.getDAGCombineLevel() < AfterLegalizeDAG)
1815 EVT VT = N->getValueType(0);
1817 // Try to get the fneg to fold into the source modifier. This undoes generic
1818 // DAG combines and folds them into the mad.
1820 // Only do this if we are not trying to support denormals. v_mad_f32 does
1821 // not support denormals ever.
1822 if (VT == MVT::f32 &&
1823 !Subtarget->hasFP32Denormals()) {
1824 SDValue LHS = N->getOperand(0);
1825 SDValue RHS = N->getOperand(1);
1826 if (LHS.getOpcode() == ISD::FADD) {
1827 // (fsub (fadd a, a), c) -> mad 2.0, a, (fneg c)
1829 SDValue A = LHS.getOperand(0);
1830 if (A == LHS.getOperand(1)) {
1831 const SDValue Two = DAG.getConstantFP(2.0, DL, MVT::f32);
1832 SDValue NegRHS = DAG.getNode(ISD::FNEG, DL, VT, RHS);
1834 return DAG.getNode(ISD::FMAD, DL, VT, Two, A, NegRHS);
1838 if (RHS.getOpcode() == ISD::FADD) {
1839 // (fsub c, (fadd a, a)) -> mad -2.0, a, c
1841 SDValue A = RHS.getOperand(0);
1842 if (A == RHS.getOperand(1)) {
1843 const SDValue NegTwo = DAG.getConstantFP(-2.0, DL, MVT::f32);
1844 return DAG.getNode(ISD::FMAD, DL, VT, NegTwo, A, LHS);
1856 case ISD::ATOMIC_LOAD:
1857 case ISD::ATOMIC_STORE:
1858 case ISD::ATOMIC_CMP_SWAP:
1859 case ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS:
1860 case ISD::ATOMIC_SWAP:
1861 case ISD::ATOMIC_LOAD_ADD:
1862 case ISD::ATOMIC_LOAD_SUB:
1863 case ISD::ATOMIC_LOAD_AND:
1864 case ISD::ATOMIC_LOAD_OR:
1865 case ISD::ATOMIC_LOAD_XOR:
1866 case ISD::ATOMIC_LOAD_NAND:
1867 case ISD::ATOMIC_LOAD_MIN:
1868 case ISD::ATOMIC_LOAD_MAX:
1869 case ISD::ATOMIC_LOAD_UMIN:
1870 case ISD::ATOMIC_LOAD_UMAX: { // TODO: Target mem intrinsics.
1871 if (DCI.isBeforeLegalize())
1874 MemSDNode *MemNode = cast<MemSDNode>(N);
1875 SDValue Ptr = MemNode->getBasePtr();
1877 // TODO: We could also do this for multiplies.
1878 unsigned AS = MemNode->getAddressSpace();
1879 if (Ptr.getOpcode() == ISD::SHL && AS != AMDGPUAS::PRIVATE_ADDRESS) {
1880 SDValue NewPtr = performSHLPtrCombine(Ptr.getNode(), AS, DCI);
1882 SmallVector<SDValue, 8> NewOps(MemNode->op_begin(), MemNode->op_end());
1884 NewOps[N->getOpcode() == ISD::STORE ? 2 : 1] = NewPtr;
1885 return SDValue(DAG.UpdateNodeOperands(MemNode, NewOps), 0);
1891 return performAndCombine(N, DCI);
1893 return performOrCombine(N, DCI);
1894 case AMDGPUISD::FP_CLASS:
1895 return performClassCombine(N, DCI);
1897 return AMDGPUTargetLowering::PerformDAGCombine(N, DCI);
1900 /// \brief Analyze the possible immediate value Op
1902 /// Returns -1 if it isn't an immediate, 0 if it's and inline immediate
1903 /// and the immediate value if it's a literal immediate
1904 int32_t SITargetLowering::analyzeImmediate(const SDNode *N) const {
1906 const SIInstrInfo *TII =
1907 static_cast<const SIInstrInfo *>(Subtarget->getInstrInfo());
1909 if (const ConstantSDNode *Node = dyn_cast<ConstantSDNode>(N)) {
1910 if (TII->isInlineConstant(Node->getAPIntValue()))
1913 uint64_t Val = Node->getZExtValue();
1914 return isUInt<32>(Val) ? Val : -1;
1917 if (const ConstantFPSDNode *Node = dyn_cast<ConstantFPSDNode>(N)) {
1918 if (TII->isInlineConstant(Node->getValueAPF().bitcastToAPInt()))
1921 if (Node->getValueType(0) == MVT::f32)
1922 return FloatToBits(Node->getValueAPF().convertToFloat());
1930 /// \brief Helper function for adjustWritemask
1931 static unsigned SubIdx2Lane(unsigned Idx) {
1934 case AMDGPU::sub0: return 0;
1935 case AMDGPU::sub1: return 1;
1936 case AMDGPU::sub2: return 2;
1937 case AMDGPU::sub3: return 3;
1941 /// \brief Adjust the writemask of MIMG instructions
1942 void SITargetLowering::adjustWritemask(MachineSDNode *&Node,
1943 SelectionDAG &DAG) const {
1944 SDNode *Users[4] = { };
1946 unsigned OldDmask = Node->getConstantOperandVal(0);
1947 unsigned NewDmask = 0;
1949 // Try to figure out the used register components
1950 for (SDNode::use_iterator I = Node->use_begin(), E = Node->use_end();
1953 // Abort if we can't understand the usage
1954 if (!I->isMachineOpcode() ||
1955 I->getMachineOpcode() != TargetOpcode::EXTRACT_SUBREG)
1958 // Lane means which subreg of %VGPRa_VGPRb_VGPRc_VGPRd is used.
1959 // Note that subregs are packed, i.e. Lane==0 is the first bit set
1960 // in OldDmask, so it can be any of X,Y,Z,W; Lane==1 is the second bit
1962 Lane = SubIdx2Lane(I->getConstantOperandVal(1));
1964 // Set which texture component corresponds to the lane.
1966 for (unsigned i = 0, Dmask = OldDmask; i <= Lane; i++) {
1968 Comp = countTrailingZeros(Dmask);
1969 Dmask &= ~(1 << Comp);
1972 // Abort if we have more than one user per component
1977 NewDmask |= 1 << Comp;
1980 // Abort if there's no change
1981 if (NewDmask == OldDmask)
1984 // Adjust the writemask in the node
1985 std::vector<SDValue> Ops;
1986 Ops.push_back(DAG.getTargetConstant(NewDmask, SDLoc(Node), MVT::i32));
1987 Ops.insert(Ops.end(), Node->op_begin() + 1, Node->op_end());
1988 Node = (MachineSDNode*)DAG.UpdateNodeOperands(Node, Ops);
1990 // If we only got one lane, replace it with a copy
1991 // (if NewDmask has only one bit set...)
1992 if (NewDmask && (NewDmask & (NewDmask-1)) == 0) {
1993 SDValue RC = DAG.getTargetConstant(AMDGPU::VGPR_32RegClassID, SDLoc(),
1995 SDNode *Copy = DAG.getMachineNode(TargetOpcode::COPY_TO_REGCLASS,
1996 SDLoc(), Users[Lane]->getValueType(0),
1997 SDValue(Node, 0), RC);
1998 DAG.ReplaceAllUsesWith(Users[Lane], Copy);
2002 // Update the users of the node with the new indices
2003 for (unsigned i = 0, Idx = AMDGPU::sub0; i < 4; ++i) {
2005 SDNode *User = Users[i];
2009 SDValue Op = DAG.getTargetConstant(Idx, SDLoc(User), MVT::i32);
2010 DAG.UpdateNodeOperands(User, User->getOperand(0), Op);
2014 case AMDGPU::sub0: Idx = AMDGPU::sub1; break;
2015 case AMDGPU::sub1: Idx = AMDGPU::sub2; break;
2016 case AMDGPU::sub2: Idx = AMDGPU::sub3; break;
2021 /// \brief Legalize target independent instructions (e.g. INSERT_SUBREG)
2022 /// with frame index operands.
2023 /// LLVM assumes that inputs are to these instructions are registers.
2024 void SITargetLowering::legalizeTargetIndependentNode(SDNode *Node,
2025 SelectionDAG &DAG) const {
2027 SmallVector<SDValue, 8> Ops;
2028 for (unsigned i = 0; i < Node->getNumOperands(); ++i) {
2029 if (!isa<FrameIndexSDNode>(Node->getOperand(i))) {
2030 Ops.push_back(Node->getOperand(i));
2035 Ops.push_back(SDValue(DAG.getMachineNode(AMDGPU::S_MOV_B32, DL,
2036 Node->getOperand(i).getValueType(),
2037 Node->getOperand(i)), 0));
2040 DAG.UpdateNodeOperands(Node, Ops);
2043 /// \brief Fold the instructions after selecting them.
2044 SDNode *SITargetLowering::PostISelFolding(MachineSDNode *Node,
2045 SelectionDAG &DAG) const {
2046 const SIInstrInfo *TII =
2047 static_cast<const SIInstrInfo *>(Subtarget->getInstrInfo());
2049 if (TII->isMIMG(Node->getMachineOpcode()))
2050 adjustWritemask(Node, DAG);
2052 if (Node->getMachineOpcode() == AMDGPU::INSERT_SUBREG ||
2053 Node->getMachineOpcode() == AMDGPU::REG_SEQUENCE) {
2054 legalizeTargetIndependentNode(Node, DAG);
2060 /// \brief Assign the register class depending on the number of
2061 /// bits set in the writemask
2062 void SITargetLowering::AdjustInstrPostInstrSelection(MachineInstr *MI,
2063 SDNode *Node) const {
2064 const SIInstrInfo *TII =
2065 static_cast<const SIInstrInfo *>(Subtarget->getInstrInfo());
2067 MachineRegisterInfo &MRI = MI->getParent()->getParent()->getRegInfo();
2068 TII->legalizeOperands(MI);
2070 if (TII->isMIMG(MI->getOpcode())) {
2071 unsigned VReg = MI->getOperand(0).getReg();
2072 unsigned Writemask = MI->getOperand(1).getImm();
2073 unsigned BitsSet = 0;
2074 for (unsigned i = 0; i < 4; ++i)
2075 BitsSet += Writemask & (1 << i) ? 1 : 0;
2077 const TargetRegisterClass *RC;
2080 case 1: RC = &AMDGPU::VGPR_32RegClass; break;
2081 case 2: RC = &AMDGPU::VReg_64RegClass; break;
2082 case 3: RC = &AMDGPU::VReg_96RegClass; break;
2085 unsigned NewOpcode = TII->getMaskedMIMGOp(MI->getOpcode(), BitsSet);
2086 MI->setDesc(TII->get(NewOpcode));
2087 MRI.setRegClass(VReg, RC);
2091 // Replace unused atomics with the no return version.
2092 int NoRetAtomicOp = AMDGPU::getAtomicNoRetOp(MI->getOpcode());
2093 if (NoRetAtomicOp != -1) {
2094 if (!Node->hasAnyUseOfValue(0)) {
2095 MI->setDesc(TII->get(NoRetAtomicOp));
2096 MI->RemoveOperand(0);
2103 static SDValue buildSMovImm32(SelectionDAG &DAG, SDLoc DL, uint64_t Val) {
2104 SDValue K = DAG.getTargetConstant(Val, DL, MVT::i32);
2105 return SDValue(DAG.getMachineNode(AMDGPU::S_MOV_B32, DL, MVT::i32, K), 0);
2108 MachineSDNode *SITargetLowering::wrapAddr64Rsrc(SelectionDAG &DAG,
2110 SDValue Ptr) const {
2111 const SIInstrInfo *TII =
2112 static_cast<const SIInstrInfo *>(Subtarget->getInstrInfo());
2114 // XXX - Workaround for moveToVALU not handling different register class
2115 // inserts for REG_SEQUENCE.
2117 // Build the half of the subregister with the constants.
2118 const SDValue Ops0[] = {
2119 DAG.getTargetConstant(AMDGPU::SGPR_64RegClassID, DL, MVT::i32),
2120 buildSMovImm32(DAG, DL, 0),
2121 DAG.getTargetConstant(AMDGPU::sub0, DL, MVT::i32),
2122 buildSMovImm32(DAG, DL, TII->getDefaultRsrcDataFormat() >> 32),
2123 DAG.getTargetConstant(AMDGPU::sub1, DL, MVT::i32)
2126 SDValue SubRegHi = SDValue(DAG.getMachineNode(AMDGPU::REG_SEQUENCE, DL,
2127 MVT::v2i32, Ops0), 0);
2129 // Combine the constants and the pointer.
2130 const SDValue Ops1[] = {
2131 DAG.getTargetConstant(AMDGPU::SReg_128RegClassID, DL, MVT::i32),
2133 DAG.getTargetConstant(AMDGPU::sub0_sub1, DL, MVT::i32),
2135 DAG.getTargetConstant(AMDGPU::sub2_sub3, DL, MVT::i32)
2138 return DAG.getMachineNode(AMDGPU::REG_SEQUENCE, DL, MVT::v4i32, Ops1);
2140 const SDValue Ops[] = {
2141 DAG.getTargetConstant(AMDGPU::SReg_128RegClassID, MVT::i32),
2143 DAG.getTargetConstant(AMDGPU::sub0_sub1, MVT::i32),
2144 buildSMovImm32(DAG, DL, 0),
2145 DAG.getTargetConstant(AMDGPU::sub2, MVT::i32),
2146 buildSMovImm32(DAG, DL, TII->getDefaultRsrcFormat() >> 32),
2147 DAG.getTargetConstant(AMDGPU::sub3, MVT::i32)
2150 return DAG.getMachineNode(AMDGPU::REG_SEQUENCE, DL, MVT::v4i32, Ops);
2155 /// \brief Return a resource descriptor with the 'Add TID' bit enabled
2156 /// The TID (Thread ID) is multipled by the stride value (bits [61:48]
2157 /// of the resource descriptor) to create an offset, which is added to the
2158 /// resource ponter.
2159 MachineSDNode *SITargetLowering::buildRSRC(SelectionDAG &DAG,
2162 uint32_t RsrcDword1,
2163 uint64_t RsrcDword2And3) const {
2164 SDValue PtrLo = DAG.getTargetExtractSubreg(AMDGPU::sub0, DL, MVT::i32, Ptr);
2165 SDValue PtrHi = DAG.getTargetExtractSubreg(AMDGPU::sub1, DL, MVT::i32, Ptr);
2167 PtrHi = SDValue(DAG.getMachineNode(AMDGPU::S_OR_B32, DL, MVT::i32, PtrHi,
2168 DAG.getConstant(RsrcDword1, DL, MVT::i32)),
2172 SDValue DataLo = buildSMovImm32(DAG, DL,
2173 RsrcDword2And3 & UINT64_C(0xFFFFFFFF));
2174 SDValue DataHi = buildSMovImm32(DAG, DL, RsrcDword2And3 >> 32);
2176 const SDValue Ops[] = {
2177 DAG.getTargetConstant(AMDGPU::SReg_128RegClassID, DL, MVT::i32),
2179 DAG.getTargetConstant(AMDGPU::sub0, DL, MVT::i32),
2181 DAG.getTargetConstant(AMDGPU::sub1, DL, MVT::i32),
2183 DAG.getTargetConstant(AMDGPU::sub2, DL, MVT::i32),
2185 DAG.getTargetConstant(AMDGPU::sub3, DL, MVT::i32)
2188 return DAG.getMachineNode(AMDGPU::REG_SEQUENCE, DL, MVT::v4i32, Ops);
2191 MachineSDNode *SITargetLowering::buildScratchRSRC(SelectionDAG &DAG,
2193 SDValue Ptr) const {
2194 const SIInstrInfo *TII =
2195 static_cast<const SIInstrInfo *>(Subtarget->getInstrInfo());
2196 uint64_t Rsrc = TII->getDefaultRsrcDataFormat() | AMDGPU::RSRC_TID_ENABLE |
2199 return buildRSRC(DAG, DL, Ptr, 0, Rsrc);
2202 SDValue SITargetLowering::CreateLiveInRegister(SelectionDAG &DAG,
2203 const TargetRegisterClass *RC,
2204 unsigned Reg, EVT VT) const {
2205 SDValue VReg = AMDGPUTargetLowering::CreateLiveInRegister(DAG, RC, Reg, VT);
2207 return DAG.getCopyFromReg(DAG.getEntryNode(), SDLoc(DAG.getEntryNode()),
2208 cast<RegisterSDNode>(VReg)->getReg(), VT);
2211 //===----------------------------------------------------------------------===//
2212 // SI Inline Assembly Support
2213 //===----------------------------------------------------------------------===//
2215 std::pair<unsigned, const TargetRegisterClass *>
2216 SITargetLowering::getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI,
2217 StringRef Constraint,
2219 if (Constraint == "r") {
2220 switch(VT.SimpleTy) {
2221 default: llvm_unreachable("Unhandled type for 'r' inline asm constraint");
2223 return std::make_pair(0U, &AMDGPU::SGPR_64RegClass);
2225 return std::make_pair(0U, &AMDGPU::SGPR_32RegClass);
2229 if (Constraint.size() > 1) {
2230 const TargetRegisterClass *RC = nullptr;
2231 if (Constraint[1] == 'v') {
2232 RC = &AMDGPU::VGPR_32RegClass;
2233 } else if (Constraint[1] == 's') {
2234 RC = &AMDGPU::SGPR_32RegClass;
2239 bool Failed = Constraint.substr(2).getAsInteger(10, Idx);
2240 if (!Failed && Idx < RC->getNumRegs())
2241 return std::make_pair(RC->getRegister(Idx), RC);
2244 return TargetLowering::getRegForInlineAsmConstraint(TRI, Constraint, VT);