1 //===-- PPCISelLowering.cpp - PPC DAG Lowering Implementation -------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Chris Lattner and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the PPCISelLowering class.
12 //===----------------------------------------------------------------------===//
14 #include "PPCISelLowering.h"
15 #include "PPCTargetMachine.h"
16 #include "llvm/ADT/VectorExtras.h"
17 #include "llvm/Analysis/ScalarEvolutionExpressions.h"
18 #include "llvm/CodeGen/MachineFrameInfo.h"
19 #include "llvm/CodeGen/MachineFunction.h"
20 #include "llvm/CodeGen/MachineInstrBuilder.h"
21 #include "llvm/CodeGen/SelectionDAG.h"
22 #include "llvm/CodeGen/SSARegMap.h"
23 #include "llvm/Constants.h"
24 #include "llvm/Function.h"
25 #include "llvm/Intrinsics.h"
26 #include "llvm/Support/MathExtras.h"
27 #include "llvm/Target/TargetOptions.h"
30 PPCTargetLowering::PPCTargetLowering(TargetMachine &TM)
31 : TargetLowering(TM) {
33 // Fold away setcc operations if possible.
34 setSetCCIsExpensive();
37 // Use _setjmp/_longjmp instead of setjmp/longjmp.
38 setUseUnderscoreSetJmpLongJmp(true);
40 // Set up the register classes.
41 addRegisterClass(MVT::i32, PPC::GPRCRegisterClass);
42 addRegisterClass(MVT::f32, PPC::F4RCRegisterClass);
43 addRegisterClass(MVT::f64, PPC::F8RCRegisterClass);
45 setOperationAction(ISD::ConstantFP, MVT::f64, Expand);
46 setOperationAction(ISD::ConstantFP, MVT::f32, Expand);
48 // PowerPC has no intrinsics for these particular operations
49 setOperationAction(ISD::MEMMOVE, MVT::Other, Expand);
50 setOperationAction(ISD::MEMSET, MVT::Other, Expand);
51 setOperationAction(ISD::MEMCPY, MVT::Other, Expand);
53 // PowerPC has an i16 but no i8 (or i1) SEXTLOAD
54 setOperationAction(ISD::SEXTLOAD, MVT::i1, Expand);
55 setOperationAction(ISD::SEXTLOAD, MVT::i8, Expand);
57 // PowerPC has no SREM/UREM instructions
58 setOperationAction(ISD::SREM, MVT::i32, Expand);
59 setOperationAction(ISD::UREM, MVT::i32, Expand);
61 // We don't support sin/cos/sqrt/fmod
62 setOperationAction(ISD::FSIN , MVT::f64, Expand);
63 setOperationAction(ISD::FCOS , MVT::f64, Expand);
64 setOperationAction(ISD::FREM , MVT::f64, Expand);
65 setOperationAction(ISD::FSIN , MVT::f32, Expand);
66 setOperationAction(ISD::FCOS , MVT::f32, Expand);
67 setOperationAction(ISD::FREM , MVT::f32, Expand);
69 // If we're enabling GP optimizations, use hardware square root
70 if (!TM.getSubtarget<PPCSubtarget>().hasFSQRT()) {
71 setOperationAction(ISD::FSQRT, MVT::f64, Expand);
72 setOperationAction(ISD::FSQRT, MVT::f32, Expand);
75 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand);
76 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand);
78 // PowerPC does not have BSWAP, CTPOP or CTTZ
79 setOperationAction(ISD::BSWAP, MVT::i32 , Expand);
80 setOperationAction(ISD::CTPOP, MVT::i32 , Expand);
81 setOperationAction(ISD::CTTZ , MVT::i32 , Expand);
83 // PowerPC does not have ROTR
84 setOperationAction(ISD::ROTR, MVT::i32 , Expand);
86 // PowerPC does not have Select
87 setOperationAction(ISD::SELECT, MVT::i32, Expand);
88 setOperationAction(ISD::SELECT, MVT::f32, Expand);
89 setOperationAction(ISD::SELECT, MVT::f64, Expand);
91 // PowerPC wants to turn select_cc of FP into fsel when possible.
92 setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
93 setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
95 // PowerPC wants to optimize integer setcc a bit
96 setOperationAction(ISD::SETCC, MVT::i32, Custom);
98 // PowerPC does not have BRCOND which requires SetCC
99 setOperationAction(ISD::BRCOND, MVT::Other, Expand);
101 // PowerPC turns FP_TO_SINT into FCTIWZ and some load/stores.
102 setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
104 // PowerPC does not have [U|S]INT_TO_FP
105 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Expand);
106 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand);
108 setOperationAction(ISD::BIT_CONVERT, MVT::f32, Expand);
109 setOperationAction(ISD::BIT_CONVERT, MVT::i32, Expand);
111 // PowerPC does not have truncstore for i1.
112 setOperationAction(ISD::TRUNCSTORE, MVT::i1, Promote);
114 // Support label based line numbers.
115 setOperationAction(ISD::LOCATION, MVT::Other, Expand);
116 setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
117 // FIXME - use subtarget debug flags
118 if (!TM.getSubtarget<PPCSubtarget>().isDarwin())
119 setOperationAction(ISD::DEBUG_LABEL, MVT::Other, Expand);
121 // We want to legalize GlobalAddress and ConstantPool nodes into the
122 // appropriate instructions to materialize the address.
123 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
124 setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
126 // RET must be custom lowered, to meet ABI requirements
127 setOperationAction(ISD::RET , MVT::Other, Custom);
129 // VASTART needs to be custom lowered to use the VarArgsFrameIndex
130 setOperationAction(ISD::VASTART , MVT::Other, Custom);
132 // Use the default implementation.
133 setOperationAction(ISD::VAARG , MVT::Other, Expand);
134 setOperationAction(ISD::VACOPY , MVT::Other, Expand);
135 setOperationAction(ISD::VAEND , MVT::Other, Expand);
136 setOperationAction(ISD::STACKSAVE , MVT::Other, Expand);
137 setOperationAction(ISD::STACKRESTORE , MVT::Other, Expand);
138 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32 , Expand);
140 // We want to custom lower some of our intrinsics.
141 setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
143 if (TM.getSubtarget<PPCSubtarget>().is64Bit()) {
144 // They also have instructions for converting between i64 and fp.
145 setOperationAction(ISD::FP_TO_SINT, MVT::i64, Custom);
146 setOperationAction(ISD::SINT_TO_FP, MVT::i64, Custom);
148 // FIXME: disable this lowered code. This generates 64-bit register values,
149 // and we don't model the fact that the top part is clobbered by calls. We
150 // need to flag these together so that the value isn't live across a call.
151 //setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
153 // To take advantage of the above i64 FP_TO_SINT, promote i32 FP_TO_UINT
154 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Promote);
156 // PowerPC does not have FP_TO_UINT on 32-bit implementations.
157 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand);
160 if (TM.getSubtarget<PPCSubtarget>().has64BitRegs()) {
161 // 64 bit PowerPC implementations can support i64 types directly
162 addRegisterClass(MVT::i64, PPC::G8RCRegisterClass);
163 // BUILD_PAIR can't be handled natively, and should be expanded to shl/or
164 setOperationAction(ISD::BUILD_PAIR, MVT::i64, Expand);
166 // 32 bit PowerPC wants to expand i64 shifts itself.
167 setOperationAction(ISD::SHL, MVT::i64, Custom);
168 setOperationAction(ISD::SRL, MVT::i64, Custom);
169 setOperationAction(ISD::SRA, MVT::i64, Custom);
172 if (TM.getSubtarget<PPCSubtarget>().hasAltivec()) {
173 // First set operation action for all vector types to expand. Then we
174 // will selectively turn on ones that can be effectively codegen'd.
175 for (unsigned VT = (unsigned)MVT::FIRST_VECTOR_VALUETYPE;
176 VT != (unsigned)MVT::LAST_VECTOR_VALUETYPE; ++VT) {
177 // add/sub/and/or/xor are legal for all supported vector VT's.
178 setOperationAction(ISD::ADD , (MVT::ValueType)VT, Legal);
179 setOperationAction(ISD::SUB , (MVT::ValueType)VT, Legal);
180 setOperationAction(ISD::AND , (MVT::ValueType)VT, Legal);
181 setOperationAction(ISD::OR , (MVT::ValueType)VT, Legal);
182 setOperationAction(ISD::XOR , (MVT::ValueType)VT, Legal);
184 // We promote all shuffles to v16i8.
185 setOperationAction(ISD::VECTOR_SHUFFLE, (MVT::ValueType)VT, Promote);
186 AddPromotedToType(ISD::VECTOR_SHUFFLE, (MVT::ValueType)VT, MVT::v16i8);
188 setOperationAction(ISD::MUL , (MVT::ValueType)VT, Expand);
189 setOperationAction(ISD::SDIV, (MVT::ValueType)VT, Expand);
190 setOperationAction(ISD::SREM, (MVT::ValueType)VT, Expand);
191 setOperationAction(ISD::UDIV, (MVT::ValueType)VT, Expand);
192 setOperationAction(ISD::UREM, (MVT::ValueType)VT, Expand);
193 setOperationAction(ISD::EXTRACT_VECTOR_ELT, (MVT::ValueType)VT, Expand);
194 setOperationAction(ISD::INSERT_VECTOR_ELT, (MVT::ValueType)VT, Expand);
195 setOperationAction(ISD::BUILD_VECTOR, (MVT::ValueType)VT, Expand);
197 setOperationAction(ISD::SCALAR_TO_VECTOR, (MVT::ValueType)VT, Expand);
200 // We can custom expand all VECTOR_SHUFFLEs to VPERM, others we can handle
201 // with merges, splats, etc.
202 setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v16i8, Custom);
204 addRegisterClass(MVT::v4f32, PPC::VRRCRegisterClass);
205 addRegisterClass(MVT::v4i32, PPC::VRRCRegisterClass);
206 addRegisterClass(MVT::v8i16, PPC::VRRCRegisterClass);
207 addRegisterClass(MVT::v16i8, PPC::VRRCRegisterClass);
209 setOperationAction(ISD::MUL, MVT::v4f32, Legal);
211 setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v4f32, Custom);
212 setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v4i32, Custom);
214 setOperationAction(ISD::BUILD_VECTOR, MVT::v16i8, Custom);
215 setOperationAction(ISD::BUILD_VECTOR, MVT::v8i16, Custom);
216 setOperationAction(ISD::BUILD_VECTOR, MVT::v4i32, Custom);
217 setOperationAction(ISD::BUILD_VECTOR, MVT::v4f32, Custom);
220 setSetCCResultContents(ZeroOrOneSetCCResult);
221 setStackPointerRegisterToSaveRestore(PPC::R1);
223 // We have target-specific dag combine patterns for the following nodes:
224 setTargetDAGCombine(ISD::SINT_TO_FP);
225 setTargetDAGCombine(ISD::STORE);
227 computeRegisterProperties();
230 const char *PPCTargetLowering::getTargetNodeName(unsigned Opcode) const {
233 case PPCISD::FSEL: return "PPCISD::FSEL";
234 case PPCISD::FCFID: return "PPCISD::FCFID";
235 case PPCISD::FCTIDZ: return "PPCISD::FCTIDZ";
236 case PPCISD::FCTIWZ: return "PPCISD::FCTIWZ";
237 case PPCISD::STFIWX: return "PPCISD::STFIWX";
238 case PPCISD::VMADDFP: return "PPCISD::VMADDFP";
239 case PPCISD::VNMSUBFP: return "PPCISD::VNMSUBFP";
240 case PPCISD::VPERM: return "PPCISD::VPERM";
241 case PPCISD::Hi: return "PPCISD::Hi";
242 case PPCISD::Lo: return "PPCISD::Lo";
243 case PPCISD::GlobalBaseReg: return "PPCISD::GlobalBaseReg";
244 case PPCISD::SRL: return "PPCISD::SRL";
245 case PPCISD::SRA: return "PPCISD::SRA";
246 case PPCISD::SHL: return "PPCISD::SHL";
247 case PPCISD::EXTSW_32: return "PPCISD::EXTSW_32";
248 case PPCISD::STD_32: return "PPCISD::STD_32";
249 case PPCISD::CALL: return "PPCISD::CALL";
250 case PPCISD::RET_FLAG: return "PPCISD::RET_FLAG";
251 case PPCISD::MFCR: return "PPCISD::MFCR";
252 case PPCISD::VCMP: return "PPCISD::VCMP";
253 case PPCISD::VCMPo: return "PPCISD::VCMPo";
257 /// isFloatingPointZero - Return true if this is 0.0 or -0.0.
258 static bool isFloatingPointZero(SDOperand Op) {
259 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(Op))
260 return CFP->isExactlyValue(-0.0) || CFP->isExactlyValue(0.0);
261 else if (Op.getOpcode() == ISD::EXTLOAD || Op.getOpcode() == ISD::LOAD) {
262 // Maybe this has already been legalized into the constant pool?
263 if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(Op.getOperand(1)))
264 if (ConstantFP *CFP = dyn_cast<ConstantFP>(CP->get()))
265 return CFP->isExactlyValue(-0.0) || CFP->isExactlyValue(0.0);
271 /// isSplatShuffleMask - Return true if the specified VECTOR_SHUFFLE operand
272 /// specifies a splat of a single element that is suitable for input to
273 /// VSPLTB/VSPLTH/VSPLTW.
274 bool PPC::isSplatShuffleMask(SDNode *N, unsigned EltSize) {
275 assert(N->getOpcode() == ISD::BUILD_VECTOR &&
276 N->getNumOperands() == 16 &&
277 (EltSize == 1 || EltSize == 2 || EltSize == 4));
279 // This is a splat operation if each element of the permute is the same, and
280 // if the value doesn't reference the second vector.
281 unsigned ElementBase = 0;
282 SDOperand Elt = N->getOperand(0);
283 if (ConstantSDNode *EltV = dyn_cast<ConstantSDNode>(Elt))
284 ElementBase = EltV->getValue();
286 return false; // FIXME: Handle UNDEF elements too!
288 if (cast<ConstantSDNode>(Elt)->getValue() >= 16)
291 // Check that they are consequtive.
292 for (unsigned i = 1; i != EltSize; ++i) {
293 if (!isa<ConstantSDNode>(N->getOperand(i)) ||
294 cast<ConstantSDNode>(N->getOperand(i))->getValue() != i+ElementBase)
298 assert(isa<ConstantSDNode>(Elt) && "Invalid VECTOR_SHUFFLE mask!");
299 for (unsigned i = EltSize, e = 16; i != e; i += EltSize) {
300 assert(isa<ConstantSDNode>(N->getOperand(i)) &&
301 "Invalid VECTOR_SHUFFLE mask!");
302 for (unsigned j = 0; j != EltSize; ++j)
303 if (N->getOperand(i+j) != N->getOperand(j))
310 /// getVSPLTImmediate - Return the appropriate VSPLT* immediate to splat the
311 /// specified isSplatShuffleMask VECTOR_SHUFFLE mask.
312 unsigned PPC::getVSPLTImmediate(SDNode *N, unsigned EltSize) {
313 assert(isSplatShuffleMask(N, EltSize));
314 return cast<ConstantSDNode>(N->getOperand(0))->getValue() / EltSize;
317 /// isVecSplatImm - Return true if this is a build_vector of constants which
318 /// can be formed by using a vspltis[bhw] instruction. The ByteSize field
319 /// indicates the number of bytes of each element [124] -> [bhw].
320 bool PPC::isVecSplatImm(SDNode *N, unsigned ByteSize, char *Val) {
321 SDOperand OpVal(0, 0);
322 // Check to see if this buildvec has a single non-undef value in its elements.
323 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
324 if (N->getOperand(i).getOpcode() == ISD::UNDEF) continue;
326 OpVal = N->getOperand(i);
327 else if (OpVal != N->getOperand(i))
331 if (OpVal.Val == 0) return false; // All UNDEF: use implicit def.
333 unsigned ValSizeInBytes = 0;
335 if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(OpVal)) {
336 Value = CN->getValue();
337 ValSizeInBytes = MVT::getSizeInBits(CN->getValueType(0))/8;
338 } else if (ConstantFPSDNode *CN = dyn_cast<ConstantFPSDNode>(OpVal)) {
339 assert(CN->getValueType(0) == MVT::f32 && "Only one legal FP vector type!");
340 Value = FloatToBits(CN->getValue());
344 // If the splat value is larger than the element value, then we can never do
345 // this splat. The only case that we could fit the replicated bits into our
346 // immediate field for would be zero, and we prefer to use vxor for it.
347 if (ValSizeInBytes < ByteSize) return false;
349 // If the element value is larger than the splat value, cut it in half and
350 // check to see if the two halves are equal. Continue doing this until we
351 // get to ByteSize. This allows us to handle 0x01010101 as 0x01.
352 while (ValSizeInBytes > ByteSize) {
353 ValSizeInBytes >>= 1;
355 // If the top half equals the bottom half, we're still ok.
356 if (((Value >> (ValSizeInBytes*8)) & ((1 << (8*ValSizeInBytes))-1)) !=
357 (Value & ((1 << (8*ValSizeInBytes))-1)))
361 // Properly sign extend the value.
362 int ShAmt = (4-ByteSize)*8;
363 int MaskVal = ((int)Value << ShAmt) >> ShAmt;
365 // If this is zero, don't match, zero matches ISD::isBuildVectorAllZeros.
366 if (MaskVal == 0) return false;
368 if (Val) *Val = MaskVal;
370 // Finally, if this value fits in a 5 bit sext field, return true.
371 return ((MaskVal << (32-5)) >> (32-5)) == MaskVal;
375 /// LowerOperation - Provide custom lowering hooks for some operations.
377 SDOperand PPCTargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
378 switch (Op.getOpcode()) {
379 default: assert(0 && "Wasn't expecting to be able to lower this!");
380 case ISD::FP_TO_SINT: {
381 assert(MVT::isFloatingPoint(Op.getOperand(0).getValueType()));
382 SDOperand Src = Op.getOperand(0);
383 if (Src.getValueType() == MVT::f32)
384 Src = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Src);
387 switch (Op.getValueType()) {
388 default: assert(0 && "Unhandled FP_TO_SINT type in custom expander!");
390 Tmp = DAG.getNode(PPCISD::FCTIWZ, MVT::f64, Src);
393 Tmp = DAG.getNode(PPCISD::FCTIDZ, MVT::f64, Src);
397 // Convert the FP value to an int value through memory.
398 SDOperand Bits = DAG.getNode(ISD::BIT_CONVERT, MVT::i64, Tmp);
399 if (Op.getValueType() == MVT::i32)
400 Bits = DAG.getNode(ISD::TRUNCATE, MVT::i32, Bits);
403 case ISD::SINT_TO_FP:
404 if (Op.getOperand(0).getValueType() == MVT::i64) {
405 SDOperand Bits = DAG.getNode(ISD::BIT_CONVERT, MVT::f64, Op.getOperand(0));
406 SDOperand FP = DAG.getNode(PPCISD::FCFID, MVT::f64, Bits);
407 if (Op.getValueType() == MVT::f32)
408 FP = DAG.getNode(ISD::FP_ROUND, MVT::f32, FP);
411 assert(Op.getOperand(0).getValueType() == MVT::i32 &&
412 "Unhandled SINT_TO_FP type in custom expander!");
413 // Since we only generate this in 64-bit mode, we can take advantage of
414 // 64-bit registers. In particular, sign extend the input value into the
415 // 64-bit register with extsw, store the WHOLE 64-bit value into the stack
416 // then lfd it and fcfid it.
417 MachineFrameInfo *FrameInfo = DAG.getMachineFunction().getFrameInfo();
418 int FrameIdx = FrameInfo->CreateStackObject(8, 8);
419 SDOperand FIdx = DAG.getFrameIndex(FrameIdx, MVT::i32);
421 SDOperand Ext64 = DAG.getNode(PPCISD::EXTSW_32, MVT::i32,
424 // STD the extended value into the stack slot.
425 SDOperand Store = DAG.getNode(PPCISD::STD_32, MVT::Other,
426 DAG.getEntryNode(), Ext64, FIdx,
427 DAG.getSrcValue(NULL));
428 // Load the value as a double.
429 SDOperand Ld = DAG.getLoad(MVT::f64, Store, FIdx, DAG.getSrcValue(NULL));
431 // FCFID it and return it.
432 SDOperand FP = DAG.getNode(PPCISD::FCFID, MVT::f64, Ld);
433 if (Op.getValueType() == MVT::f32)
434 FP = DAG.getNode(ISD::FP_ROUND, MVT::f32, FP);
439 case ISD::SELECT_CC: {
440 // Turn FP only select_cc's into fsel instructions.
441 if (!MVT::isFloatingPoint(Op.getOperand(0).getValueType()) ||
442 !MVT::isFloatingPoint(Op.getOperand(2).getValueType()))
445 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
447 // Cannot handle SETEQ/SETNE.
448 if (CC == ISD::SETEQ || CC == ISD::SETNE) break;
450 MVT::ValueType ResVT = Op.getValueType();
451 MVT::ValueType CmpVT = Op.getOperand(0).getValueType();
452 SDOperand LHS = Op.getOperand(0), RHS = Op.getOperand(1);
453 SDOperand TV = Op.getOperand(2), FV = Op.getOperand(3);
455 // If the RHS of the comparison is a 0.0, we don't need to do the
456 // subtraction at all.
457 if (isFloatingPointZero(RHS))
459 default: break; // SETUO etc aren't handled by fsel.
462 std::swap(TV, FV); // fsel is natively setge, swap operands for setlt
465 if (LHS.getValueType() == MVT::f32) // Comparison is always 64-bits
466 LHS = DAG.getNode(ISD::FP_EXTEND, MVT::f64, LHS);
467 return DAG.getNode(PPCISD::FSEL, ResVT, LHS, TV, FV);
470 std::swap(TV, FV); // fsel is natively setge, swap operands for setlt
473 if (LHS.getValueType() == MVT::f32) // Comparison is always 64-bits
474 LHS = DAG.getNode(ISD::FP_EXTEND, MVT::f64, LHS);
475 return DAG.getNode(PPCISD::FSEL, ResVT,
476 DAG.getNode(ISD::FNEG, MVT::f64, LHS), TV, FV);
481 default: break; // SETUO etc aren't handled by fsel.
484 Cmp = DAG.getNode(ISD::FSUB, CmpVT, LHS, RHS);
485 if (Cmp.getValueType() == MVT::f32) // Comparison is always 64-bits
486 Cmp = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Cmp);
487 return DAG.getNode(PPCISD::FSEL, ResVT, Cmp, FV, TV);
490 Cmp = DAG.getNode(ISD::FSUB, CmpVT, LHS, RHS);
491 if (Cmp.getValueType() == MVT::f32) // Comparison is always 64-bits
492 Cmp = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Cmp);
493 return DAG.getNode(PPCISD::FSEL, ResVT, Cmp, TV, FV);
496 Cmp = DAG.getNode(ISD::FSUB, CmpVT, RHS, LHS);
497 if (Cmp.getValueType() == MVT::f32) // Comparison is always 64-bits
498 Cmp = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Cmp);
499 return DAG.getNode(PPCISD::FSEL, ResVT, Cmp, FV, TV);
502 Cmp = DAG.getNode(ISD::FSUB, CmpVT, RHS, LHS);
503 if (Cmp.getValueType() == MVT::f32) // Comparison is always 64-bits
504 Cmp = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Cmp);
505 return DAG.getNode(PPCISD::FSEL, ResVT, Cmp, TV, FV);
510 assert(Op.getValueType() == MVT::i64 &&
511 Op.getOperand(1).getValueType() == MVT::i32 && "Unexpected SHL!");
512 // The generic code does a fine job expanding shift by a constant.
513 if (isa<ConstantSDNode>(Op.getOperand(1))) break;
515 // Otherwise, expand into a bunch of logical ops. Note that these ops
516 // depend on the PPC behavior for oversized shift amounts.
517 SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op.getOperand(0),
518 DAG.getConstant(0, MVT::i32));
519 SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op.getOperand(0),
520 DAG.getConstant(1, MVT::i32));
521 SDOperand Amt = Op.getOperand(1);
523 SDOperand Tmp1 = DAG.getNode(ISD::SUB, MVT::i32,
524 DAG.getConstant(32, MVT::i32), Amt);
525 SDOperand Tmp2 = DAG.getNode(PPCISD::SHL, MVT::i32, Hi, Amt);
526 SDOperand Tmp3 = DAG.getNode(PPCISD::SRL, MVT::i32, Lo, Tmp1);
527 SDOperand Tmp4 = DAG.getNode(ISD::OR , MVT::i32, Tmp2, Tmp3);
528 SDOperand Tmp5 = DAG.getNode(ISD::ADD, MVT::i32, Amt,
529 DAG.getConstant(-32U, MVT::i32));
530 SDOperand Tmp6 = DAG.getNode(PPCISD::SHL, MVT::i32, Lo, Tmp5);
531 SDOperand OutHi = DAG.getNode(ISD::OR, MVT::i32, Tmp4, Tmp6);
532 SDOperand OutLo = DAG.getNode(PPCISD::SHL, MVT::i32, Lo, Amt);
533 return DAG.getNode(ISD::BUILD_PAIR, MVT::i64, OutLo, OutHi);
536 assert(Op.getValueType() == MVT::i64 &&
537 Op.getOperand(1).getValueType() == MVT::i32 && "Unexpected SHL!");
538 // The generic code does a fine job expanding shift by a constant.
539 if (isa<ConstantSDNode>(Op.getOperand(1))) break;
541 // Otherwise, expand into a bunch of logical ops. Note that these ops
542 // depend on the PPC behavior for oversized shift amounts.
543 SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op.getOperand(0),
544 DAG.getConstant(0, MVT::i32));
545 SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op.getOperand(0),
546 DAG.getConstant(1, MVT::i32));
547 SDOperand Amt = Op.getOperand(1);
549 SDOperand Tmp1 = DAG.getNode(ISD::SUB, MVT::i32,
550 DAG.getConstant(32, MVT::i32), Amt);
551 SDOperand Tmp2 = DAG.getNode(PPCISD::SRL, MVT::i32, Lo, Amt);
552 SDOperand Tmp3 = DAG.getNode(PPCISD::SHL, MVT::i32, Hi, Tmp1);
553 SDOperand Tmp4 = DAG.getNode(ISD::OR , MVT::i32, Tmp2, Tmp3);
554 SDOperand Tmp5 = DAG.getNode(ISD::ADD, MVT::i32, Amt,
555 DAG.getConstant(-32U, MVT::i32));
556 SDOperand Tmp6 = DAG.getNode(PPCISD::SRL, MVT::i32, Hi, Tmp5);
557 SDOperand OutLo = DAG.getNode(ISD::OR, MVT::i32, Tmp4, Tmp6);
558 SDOperand OutHi = DAG.getNode(PPCISD::SRL, MVT::i32, Hi, Amt);
559 return DAG.getNode(ISD::BUILD_PAIR, MVT::i64, OutLo, OutHi);
562 assert(Op.getValueType() == MVT::i64 &&
563 Op.getOperand(1).getValueType() == MVT::i32 && "Unexpected SRA!");
564 // The generic code does a fine job expanding shift by a constant.
565 if (isa<ConstantSDNode>(Op.getOperand(1))) break;
567 // Otherwise, expand into a bunch of logical ops, followed by a select_cc.
568 SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op.getOperand(0),
569 DAG.getConstant(0, MVT::i32));
570 SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op.getOperand(0),
571 DAG.getConstant(1, MVT::i32));
572 SDOperand Amt = Op.getOperand(1);
574 SDOperand Tmp1 = DAG.getNode(ISD::SUB, MVT::i32,
575 DAG.getConstant(32, MVT::i32), Amt);
576 SDOperand Tmp2 = DAG.getNode(PPCISD::SRL, MVT::i32, Lo, Amt);
577 SDOperand Tmp3 = DAG.getNode(PPCISD::SHL, MVT::i32, Hi, Tmp1);
578 SDOperand Tmp4 = DAG.getNode(ISD::OR , MVT::i32, Tmp2, Tmp3);
579 SDOperand Tmp5 = DAG.getNode(ISD::ADD, MVT::i32, Amt,
580 DAG.getConstant(-32U, MVT::i32));
581 SDOperand Tmp6 = DAG.getNode(PPCISD::SRA, MVT::i32, Hi, Tmp5);
582 SDOperand OutHi = DAG.getNode(PPCISD::SRA, MVT::i32, Hi, Amt);
583 SDOperand OutLo = DAG.getSelectCC(Tmp5, DAG.getConstant(0, MVT::i32),
584 Tmp4, Tmp6, ISD::SETLE);
585 return DAG.getNode(ISD::BUILD_PAIR, MVT::i64, OutLo, OutHi);
587 case ISD::ConstantPool: {
588 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
589 Constant *C = CP->get();
590 SDOperand CPI = DAG.getTargetConstantPool(C, MVT::i32, CP->getAlignment());
591 SDOperand Zero = DAG.getConstant(0, MVT::i32);
593 if (getTargetMachine().getRelocationModel() == Reloc::Static) {
594 // Generate non-pic code that has direct accesses to the constant pool.
595 // The address of the global is just (hi(&g)+lo(&g)).
596 SDOperand Hi = DAG.getNode(PPCISD::Hi, MVT::i32, CPI, Zero);
597 SDOperand Lo = DAG.getNode(PPCISD::Lo, MVT::i32, CPI, Zero);
598 return DAG.getNode(ISD::ADD, MVT::i32, Hi, Lo);
601 // Only lower ConstantPool on Darwin.
602 if (!getTargetMachine().getSubtarget<PPCSubtarget>().isDarwin()) break;
603 SDOperand Hi = DAG.getNode(PPCISD::Hi, MVT::i32, CPI, Zero);
604 if (getTargetMachine().getRelocationModel() == Reloc::PIC) {
605 // With PIC, the first instruction is actually "GR+hi(&G)".
606 Hi = DAG.getNode(ISD::ADD, MVT::i32,
607 DAG.getNode(PPCISD::GlobalBaseReg, MVT::i32), Hi);
610 SDOperand Lo = DAG.getNode(PPCISD::Lo, MVT::i32, CPI, Zero);
611 Lo = DAG.getNode(ISD::ADD, MVT::i32, Hi, Lo);
614 case ISD::GlobalAddress: {
615 GlobalAddressSDNode *GSDN = cast<GlobalAddressSDNode>(Op);
616 GlobalValue *GV = GSDN->getGlobal();
617 SDOperand GA = DAG.getTargetGlobalAddress(GV, MVT::i32, GSDN->getOffset());
618 SDOperand Zero = DAG.getConstant(0, MVT::i32);
620 if (getTargetMachine().getRelocationModel() == Reloc::Static) {
621 // Generate non-pic code that has direct accesses to globals.
622 // The address of the global is just (hi(&g)+lo(&g)).
623 SDOperand Hi = DAG.getNode(PPCISD::Hi, MVT::i32, GA, Zero);
624 SDOperand Lo = DAG.getNode(PPCISD::Lo, MVT::i32, GA, Zero);
625 return DAG.getNode(ISD::ADD, MVT::i32, Hi, Lo);
628 // Only lower GlobalAddress on Darwin.
629 if (!getTargetMachine().getSubtarget<PPCSubtarget>().isDarwin()) break;
631 SDOperand Hi = DAG.getNode(PPCISD::Hi, MVT::i32, GA, Zero);
632 if (getTargetMachine().getRelocationModel() == Reloc::PIC) {
633 // With PIC, the first instruction is actually "GR+hi(&G)".
634 Hi = DAG.getNode(ISD::ADD, MVT::i32,
635 DAG.getNode(PPCISD::GlobalBaseReg, MVT::i32), Hi);
638 SDOperand Lo = DAG.getNode(PPCISD::Lo, MVT::i32, GA, Zero);
639 Lo = DAG.getNode(ISD::ADD, MVT::i32, Hi, Lo);
641 if (!GV->hasWeakLinkage() && !GV->hasLinkOnceLinkage() &&
642 (!GV->isExternal() || GV->hasNotBeenReadFromBytecode()))
645 // If the global is weak or external, we have to go through the lazy
647 return DAG.getLoad(MVT::i32, DAG.getEntryNode(), Lo, DAG.getSrcValue(0));
650 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
652 // If we're comparing for equality to zero, expose the fact that this is
653 // implented as a ctlz/srl pair on ppc, so that the dag combiner can
654 // fold the new nodes.
655 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
656 if (C->isNullValue() && CC == ISD::SETEQ) {
657 MVT::ValueType VT = Op.getOperand(0).getValueType();
658 SDOperand Zext = Op.getOperand(0);
661 Zext = DAG.getNode(ISD::ZERO_EXTEND, VT, Op.getOperand(0));
663 unsigned Log2b = Log2_32(MVT::getSizeInBits(VT));
664 SDOperand Clz = DAG.getNode(ISD::CTLZ, VT, Zext);
665 SDOperand Scc = DAG.getNode(ISD::SRL, VT, Clz,
666 DAG.getConstant(Log2b, getShiftAmountTy()));
667 return DAG.getNode(ISD::TRUNCATE, getSetCCResultTy(), Scc);
669 // Leave comparisons against 0 and -1 alone for now, since they're usually
670 // optimized. FIXME: revisit this when we can custom lower all setcc
672 if (C->isAllOnesValue() || C->isNullValue())
676 // If we have an integer seteq/setne, turn it into a compare against zero
677 // by subtracting the rhs from the lhs, which is faster than setting a
678 // condition register, reading it back out, and masking the correct bit.
679 MVT::ValueType LHSVT = Op.getOperand(0).getValueType();
680 if (MVT::isInteger(LHSVT) && (CC == ISD::SETEQ || CC == ISD::SETNE)) {
681 MVT::ValueType VT = Op.getValueType();
682 SDOperand Sub = DAG.getNode(ISD::SUB, LHSVT, Op.getOperand(0),
684 return DAG.getSetCC(VT, Sub, DAG.getConstant(0, LHSVT), CC);
689 // vastart just stores the address of the VarArgsFrameIndex slot into the
690 // memory location argument.
691 // FIXME: Replace MVT::i32 with PointerTy
692 SDOperand FR = DAG.getFrameIndex(VarArgsFrameIndex, MVT::i32);
693 return DAG.getNode(ISD::STORE, MVT::Other, Op.getOperand(0), FR,
694 Op.getOperand(1), Op.getOperand(2));
699 switch(Op.getNumOperands()) {
701 assert(0 && "Do not know how to return this many arguments!");
704 return SDOperand(); // ret void is legal
706 MVT::ValueType ArgVT = Op.getOperand(1).getValueType();
707 unsigned ArgReg = MVT::isInteger(ArgVT) ? PPC::R3 : PPC::F1;
708 Copy = DAG.getCopyToReg(Op.getOperand(0), ArgReg, Op.getOperand(1),
713 Copy = DAG.getCopyToReg(Op.getOperand(0), PPC::R3, Op.getOperand(2),
715 Copy = DAG.getCopyToReg(Copy, PPC::R4, Op.getOperand(1),Copy.getValue(1));
718 return DAG.getNode(PPCISD::RET_FLAG, MVT::Other, Copy, Copy.getValue(1));
720 case ISD::SCALAR_TO_VECTOR: {
721 // Create a stack slot that is 16-byte aligned.
722 MachineFrameInfo *FrameInfo = DAG.getMachineFunction().getFrameInfo();
723 int FrameIdx = FrameInfo->CreateStackObject(16, 16);
724 SDOperand FIdx = DAG.getFrameIndex(FrameIdx, MVT::i32);
726 // Store the input value into Value#0 of the stack slot.
727 SDOperand Store = DAG.getNode(ISD::STORE, MVT::Other, DAG.getEntryNode(),
728 Op.getOperand(0), FIdx,DAG.getSrcValue(NULL));
730 return DAG.getLoad(Op.getValueType(), Store, FIdx, DAG.getSrcValue(NULL));
732 case ISD::BUILD_VECTOR:
733 // If this is a case we can't handle, return null and let the default
734 // expansion code take care of it. If we CAN select this case, return Op.
736 // See if this is all zeros.
737 // FIXME: We should handle splat(-0.0), and other cases here.
738 if (ISD::isBuildVectorAllZeros(Op.Val))
741 if (PPC::isVecSplatImm(Op.Val, 1) || // vspltisb
742 PPC::isVecSplatImm(Op.Val, 2) || // vspltish
743 PPC::isVecSplatImm(Op.Val, 4)) // vspltisw
748 case ISD::VECTOR_SHUFFLE: {
749 SDOperand V1 = Op.getOperand(0);
750 SDOperand V2 = Op.getOperand(1);
751 SDOperand PermMask = Op.getOperand(2);
753 // Cases that are handled by instructions that take permute immediates
754 // (such as vsplt*) should be left as VECTOR_SHUFFLE nodes so they can be
755 // selected by the instruction selector.
756 if (V2.getOpcode() == ISD::UNDEF &&
757 (PPC::isSplatShuffleMask(PermMask.Val, 1) ||
758 PPC::isSplatShuffleMask(PermMask.Val, 2) ||
759 PPC::isSplatShuffleMask(PermMask.Val, 4)))
762 // TODO: Handle more cases, and also handle cases that are cheaper to do as
763 // multiple such instructions than as a constant pool load/vperm pair.
765 // Lower this to a VPERM(V1, V2, V3) expression, where V3 is a constant
766 // vector that will get spilled to the constant pool.
767 if (V2.getOpcode() == ISD::UNDEF) V2 = V1;
769 // The SHUFFLE_VECTOR mask is almost exactly what we want for vperm, except
770 // that it is in input element units, not in bytes. Convert now.
771 MVT::ValueType EltVT = MVT::getVectorBaseType(V1.getValueType());
772 unsigned BytesPerElement = MVT::getSizeInBits(EltVT)/8;
774 std::vector<SDOperand> ResultMask;
775 for (unsigned i = 0, e = PermMask.getNumOperands(); i != e; ++i) {
776 unsigned SrcElt =cast<ConstantSDNode>(PermMask.getOperand(i))->getValue();
778 for (unsigned j = 0; j != BytesPerElement; ++j)
779 ResultMask.push_back(DAG.getConstant(SrcElt*BytesPerElement+j,
783 SDOperand VPermMask =DAG.getNode(ISD::BUILD_VECTOR, MVT::v16i8, ResultMask);
784 return DAG.getNode(PPCISD::VPERM, V1.getValueType(), V1, V2, VPermMask);
786 case ISD::INTRINSIC_WO_CHAIN: {
787 unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getValue();
789 // If this is a lowered altivec predicate compare, CompareOpc is set to the
790 // opcode number of the comparison.
794 default: return SDOperand(); // Don't custom lower most intrinsics.
795 // Comparison predicates.
796 case Intrinsic::ppc_altivec_vcmpbfp_p: CompareOpc = 966; isDot = 1; break;
797 case Intrinsic::ppc_altivec_vcmpeqfp_p: CompareOpc = 198; isDot = 1; break;
798 case Intrinsic::ppc_altivec_vcmpequb_p: CompareOpc = 6; isDot = 1; break;
799 case Intrinsic::ppc_altivec_vcmpequh_p: CompareOpc = 70; isDot = 1; break;
800 case Intrinsic::ppc_altivec_vcmpequw_p: CompareOpc = 134; isDot = 1; break;
801 case Intrinsic::ppc_altivec_vcmpgefp_p: CompareOpc = 454; isDot = 1; break;
802 case Intrinsic::ppc_altivec_vcmpgtfp_p: CompareOpc = 710; isDot = 1; break;
803 case Intrinsic::ppc_altivec_vcmpgtsb_p: CompareOpc = 774; isDot = 1; break;
804 case Intrinsic::ppc_altivec_vcmpgtsh_p: CompareOpc = 838; isDot = 1; break;
805 case Intrinsic::ppc_altivec_vcmpgtsw_p: CompareOpc = 902; isDot = 1; break;
806 case Intrinsic::ppc_altivec_vcmpgtub_p: CompareOpc = 518; isDot = 1; break;
807 case Intrinsic::ppc_altivec_vcmpgtuh_p: CompareOpc = 582; isDot = 1; break;
808 case Intrinsic::ppc_altivec_vcmpgtuw_p: CompareOpc = 646; isDot = 1; break;
810 // Normal Comparisons.
811 case Intrinsic::ppc_altivec_vcmpbfp: CompareOpc = 966; isDot = 0; break;
812 case Intrinsic::ppc_altivec_vcmpeqfp: CompareOpc = 198; isDot = 0; break;
813 case Intrinsic::ppc_altivec_vcmpequb: CompareOpc = 6; isDot = 0; break;
814 case Intrinsic::ppc_altivec_vcmpequh: CompareOpc = 70; isDot = 0; break;
815 case Intrinsic::ppc_altivec_vcmpequw: CompareOpc = 134; isDot = 0; break;
816 case Intrinsic::ppc_altivec_vcmpgefp: CompareOpc = 454; isDot = 0; break;
817 case Intrinsic::ppc_altivec_vcmpgtfp: CompareOpc = 710; isDot = 0; break;
818 case Intrinsic::ppc_altivec_vcmpgtsb: CompareOpc = 774; isDot = 0; break;
819 case Intrinsic::ppc_altivec_vcmpgtsh: CompareOpc = 838; isDot = 0; break;
820 case Intrinsic::ppc_altivec_vcmpgtsw: CompareOpc = 902; isDot = 0; break;
821 case Intrinsic::ppc_altivec_vcmpgtub: CompareOpc = 518; isDot = 0; break;
822 case Intrinsic::ppc_altivec_vcmpgtuh: CompareOpc = 582; isDot = 0; break;
823 case Intrinsic::ppc_altivec_vcmpgtuw: CompareOpc = 646; isDot = 0; break;
826 assert(CompareOpc>0 && "We only lower altivec predicate compares so far!");
828 // If this is a non-dot comparison, make the VCMP node.
830 return DAG.getNode(PPCISD::VCMP, Op.getOperand(2).getValueType(),
831 Op.getOperand(1), Op.getOperand(2),
832 DAG.getConstant(CompareOpc, MVT::i32));
834 // Create the PPCISD altivec 'dot' comparison node.
835 std::vector<SDOperand> Ops;
836 std::vector<MVT::ValueType> VTs;
837 Ops.push_back(Op.getOperand(2)); // LHS
838 Ops.push_back(Op.getOperand(3)); // RHS
839 Ops.push_back(DAG.getConstant(CompareOpc, MVT::i32));
840 VTs.push_back(Op.getOperand(2).getValueType());
841 VTs.push_back(MVT::Flag);
842 SDOperand CompNode = DAG.getNode(PPCISD::VCMPo, VTs, Ops);
844 // Now that we have the comparison, emit a copy from the CR to a GPR.
845 // This is flagged to the above dot comparison.
846 SDOperand Flags = DAG.getNode(PPCISD::MFCR, MVT::i32,
847 DAG.getRegister(PPC::CR6, MVT::i32),
848 CompNode.getValue(1));
850 // Unpack the result based on how the target uses it.
851 unsigned BitNo; // Bit # of CR6.
852 bool InvertBit; // Invert result?
853 switch (cast<ConstantSDNode>(Op.getOperand(1))->getValue()) {
854 default: // Can't happen, don't crash on invalid number though.
855 case 0: // Return the value of the EQ bit of CR6.
856 BitNo = 0; InvertBit = false;
858 case 1: // Return the inverted value of the EQ bit of CR6.
859 BitNo = 0; InvertBit = true;
861 case 2: // Return the value of the LT bit of CR6.
862 BitNo = 2; InvertBit = false;
864 case 3: // Return the inverted value of the LT bit of CR6.
865 BitNo = 2; InvertBit = true;
869 // Shift the bit into the low position.
870 Flags = DAG.getNode(ISD::SRL, MVT::i32, Flags,
871 DAG.getConstant(8-(3-BitNo), MVT::i32));
873 Flags = DAG.getNode(ISD::AND, MVT::i32, Flags,
874 DAG.getConstant(1, MVT::i32));
876 // If we are supposed to, toggle the bit.
878 Flags = DAG.getNode(ISD::XOR, MVT::i32, Flags,
879 DAG.getConstant(1, MVT::i32));
886 std::vector<SDOperand>
887 PPCTargetLowering::LowerArguments(Function &F, SelectionDAG &DAG) {
889 // add beautiful description of PPC stack frame format, or at least some docs
891 MachineFunction &MF = DAG.getMachineFunction();
892 MachineFrameInfo *MFI = MF.getFrameInfo();
893 MachineBasicBlock& BB = MF.front();
894 SSARegMap *RegMap = MF.getSSARegMap();
895 std::vector<SDOperand> ArgValues;
897 unsigned ArgOffset = 24;
898 unsigned GPR_remaining = 8;
899 unsigned FPR_remaining = 13;
900 unsigned GPR_idx = 0, FPR_idx = 0;
901 static const unsigned GPR[] = {
902 PPC::R3, PPC::R4, PPC::R5, PPC::R6,
903 PPC::R7, PPC::R8, PPC::R9, PPC::R10,
905 static const unsigned FPR[] = {
906 PPC::F1, PPC::F2, PPC::F3, PPC::F4, PPC::F5, PPC::F6, PPC::F7,
907 PPC::F8, PPC::F9, PPC::F10, PPC::F11, PPC::F12, PPC::F13
910 // Add DAG nodes to load the arguments... On entry to a function on PPC,
911 // the arguments start at offset 24, although they are likely to be passed
913 for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end(); I != E; ++I) {
914 SDOperand newroot, argt;
916 bool needsLoad = false;
917 bool ArgLive = !I->use_empty();
918 MVT::ValueType ObjectVT = getValueType(I->getType());
921 default: assert(0 && "Unhandled argument type!");
928 if (GPR_remaining > 0) {
929 unsigned VReg = RegMap->createVirtualRegister(&PPC::GPRCRegClass);
930 MF.addLiveIn(GPR[GPR_idx], VReg);
931 argt = newroot = DAG.getCopyFromReg(DAG.getRoot(), VReg, MVT::i32);
932 if (ObjectVT != MVT::i32) {
933 unsigned AssertOp = I->getType()->isSigned() ? ISD::AssertSext
935 argt = DAG.getNode(AssertOp, MVT::i32, argt,
936 DAG.getValueType(ObjectVT));
937 argt = DAG.getNode(ISD::TRUNCATE, ObjectVT, argt);
946 if (GPR_remaining > 0) {
947 SDOperand argHi, argLo;
948 unsigned VReg = RegMap->createVirtualRegister(&PPC::GPRCRegClass);
949 MF.addLiveIn(GPR[GPR_idx], VReg);
950 argHi = DAG.getCopyFromReg(DAG.getRoot(), VReg, MVT::i32);
951 // If we have two or more remaining argument registers, then both halves
952 // of the i64 can be sourced from there. Otherwise, the lower half will
953 // have to come off the stack. This can happen when an i64 is preceded
954 // by 28 bytes of arguments.
955 if (GPR_remaining > 1) {
956 unsigned VReg = RegMap->createVirtualRegister(&PPC::GPRCRegClass);
957 MF.addLiveIn(GPR[GPR_idx+1], VReg);
958 argLo = DAG.getCopyFromReg(argHi, VReg, MVT::i32);
960 int FI = MFI->CreateFixedObject(4, ArgOffset+4);
961 SDOperand FIN = DAG.getFrameIndex(FI, MVT::i32);
962 argLo = DAG.getLoad(MVT::i32, DAG.getEntryNode(), FIN,
963 DAG.getSrcValue(NULL));
965 // Build the outgoing arg thingy
966 argt = DAG.getNode(ISD::BUILD_PAIR, MVT::i64, argLo, argHi);
974 ObjSize = (ObjectVT == MVT::f64) ? 8 : 4;
976 if (FPR_remaining > 0) {
982 if (FPR_remaining > 0) {
984 if (ObjectVT == MVT::f32)
985 VReg = RegMap->createVirtualRegister(&PPC::F4RCRegClass);
987 VReg = RegMap->createVirtualRegister(&PPC::F8RCRegClass);
988 MF.addLiveIn(FPR[FPR_idx], VReg);
989 argt = newroot = DAG.getCopyFromReg(DAG.getRoot(), VReg, ObjectVT);
998 // We need to load the argument to a virtual register if we determined above
999 // that we ran out of physical registers of the appropriate type
1001 unsigned SubregOffset = 0;
1002 if (ObjectVT == MVT::i8 || ObjectVT == MVT::i1) SubregOffset = 3;
1003 if (ObjectVT == MVT::i16) SubregOffset = 2;
1004 int FI = MFI->CreateFixedObject(ObjSize, ArgOffset);
1005 SDOperand FIN = DAG.getFrameIndex(FI, MVT::i32);
1006 FIN = DAG.getNode(ISD::ADD, MVT::i32, FIN,
1007 DAG.getConstant(SubregOffset, MVT::i32));
1008 argt = newroot = DAG.getLoad(ObjectVT, DAG.getEntryNode(), FIN,
1009 DAG.getSrcValue(NULL));
1012 // Every 4 bytes of argument space consumes one of the GPRs available for
1013 // argument passing.
1014 if (GPR_remaining > 0) {
1015 unsigned delta = (GPR_remaining > 1 && ObjSize == 8) ? 2 : 1;
1016 GPR_remaining -= delta;
1019 ArgOffset += ObjSize;
1021 DAG.setRoot(newroot.getValue(1));
1023 ArgValues.push_back(argt);
1026 // If the function takes variable number of arguments, make a frame index for
1027 // the start of the first vararg value... for expansion of llvm.va_start.
1029 VarArgsFrameIndex = MFI->CreateFixedObject(4, ArgOffset);
1030 SDOperand FIN = DAG.getFrameIndex(VarArgsFrameIndex, MVT::i32);
1031 // If this function is vararg, store any remaining integer argument regs
1032 // to their spots on the stack so that they may be loaded by deferencing the
1033 // result of va_next.
1034 std::vector<SDOperand> MemOps;
1035 for (; GPR_remaining > 0; --GPR_remaining, ++GPR_idx) {
1036 unsigned VReg = RegMap->createVirtualRegister(&PPC::GPRCRegClass);
1037 MF.addLiveIn(GPR[GPR_idx], VReg);
1038 SDOperand Val = DAG.getCopyFromReg(DAG.getRoot(), VReg, MVT::i32);
1039 SDOperand Store = DAG.getNode(ISD::STORE, MVT::Other, Val.getValue(1),
1040 Val, FIN, DAG.getSrcValue(NULL));
1041 MemOps.push_back(Store);
1042 // Increment the address by four for the next argument to store
1043 SDOperand PtrOff = DAG.getConstant(4, getPointerTy());
1044 FIN = DAG.getNode(ISD::ADD, MVT::i32, FIN, PtrOff);
1046 if (!MemOps.empty()) {
1047 MemOps.push_back(DAG.getRoot());
1048 DAG.setRoot(DAG.getNode(ISD::TokenFactor, MVT::Other, MemOps));
1052 // Finally, inform the code generator which regs we return values in.
1053 switch (getValueType(F.getReturnType())) {
1054 default: assert(0 && "Unknown type!");
1055 case MVT::isVoid: break;
1060 MF.addLiveOut(PPC::R3);
1063 MF.addLiveOut(PPC::R3);
1064 MF.addLiveOut(PPC::R4);
1068 MF.addLiveOut(PPC::F1);
1075 std::pair<SDOperand, SDOperand>
1076 PPCTargetLowering::LowerCallTo(SDOperand Chain,
1077 const Type *RetTy, bool isVarArg,
1078 unsigned CallingConv, bool isTailCall,
1079 SDOperand Callee, ArgListTy &Args,
1080 SelectionDAG &DAG) {
1081 // args_to_use will accumulate outgoing args for the PPCISD::CALL case in
1082 // SelectExpr to use to put the arguments in the appropriate registers.
1083 std::vector<SDOperand> args_to_use;
1085 // Count how many bytes are to be pushed on the stack, including the linkage
1086 // area, and parameter passing area.
1087 unsigned NumBytes = 24;
1090 Chain = DAG.getCALLSEQ_START(Chain,
1091 DAG.getConstant(NumBytes, getPointerTy()));
1093 for (unsigned i = 0, e = Args.size(); i != e; ++i) {
1094 switch (getValueType(Args[i].second)) {
1095 default: assert(0 && "Unknown value type!");
1110 // Just to be safe, we'll always reserve the full 24 bytes of linkage area
1111 // plus 32 bytes of argument space in case any called code gets funky on us.
1112 // (Required by ABI to support var arg)
1113 if (NumBytes < 56) NumBytes = 56;
1115 // Adjust the stack pointer for the new arguments...
1116 // These operations are automatically eliminated by the prolog/epilog pass
1117 Chain = DAG.getCALLSEQ_START(Chain,
1118 DAG.getConstant(NumBytes, getPointerTy()));
1120 // Set up a copy of the stack pointer for use loading and storing any
1121 // arguments that may not fit in the registers available for argument
1123 SDOperand StackPtr = DAG.getRegister(PPC::R1, MVT::i32);
1125 // Figure out which arguments are going to go in registers, and which in
1126 // memory. Also, if this is a vararg function, floating point operations
1127 // must be stored to our stack, and loaded into integer regs as well, if
1128 // any integer regs are available for argument passing.
1129 unsigned ArgOffset = 24;
1130 unsigned GPR_remaining = 8;
1131 unsigned FPR_remaining = 13;
1133 std::vector<SDOperand> MemOps;
1134 for (unsigned i = 0, e = Args.size(); i != e; ++i) {
1135 // PtrOff will be used to store the current argument to the stack if a
1136 // register cannot be found for it.
1137 SDOperand PtrOff = DAG.getConstant(ArgOffset, getPointerTy());
1138 PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff);
1139 MVT::ValueType ArgVT = getValueType(Args[i].second);
1142 default: assert(0 && "Unexpected ValueType for argument!");
1146 // Promote the integer to 32 bits. If the input type is signed use a
1147 // sign extend, otherwise use a zero extend.
1148 if (Args[i].second->isSigned())
1149 Args[i].first =DAG.getNode(ISD::SIGN_EXTEND, MVT::i32, Args[i].first);
1151 Args[i].first =DAG.getNode(ISD::ZERO_EXTEND, MVT::i32, Args[i].first);
1154 if (GPR_remaining > 0) {
1155 args_to_use.push_back(Args[i].first);
1158 MemOps.push_back(DAG.getNode(ISD::STORE, MVT::Other, Chain,
1159 Args[i].first, PtrOff,
1160 DAG.getSrcValue(NULL)));
1165 // If we have one free GPR left, we can place the upper half of the i64
1166 // in it, and store the other half to the stack. If we have two or more
1167 // free GPRs, then we can pass both halves of the i64 in registers.
1168 if (GPR_remaining > 0) {
1169 SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32,
1170 Args[i].first, DAG.getConstant(1, MVT::i32));
1171 SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32,
1172 Args[i].first, DAG.getConstant(0, MVT::i32));
1173 args_to_use.push_back(Hi);
1175 if (GPR_remaining > 0) {
1176 args_to_use.push_back(Lo);
1179 SDOperand ConstFour = DAG.getConstant(4, getPointerTy());
1180 PtrOff = DAG.getNode(ISD::ADD, MVT::i32, PtrOff, ConstFour);
1181 MemOps.push_back(DAG.getNode(ISD::STORE, MVT::Other, Chain,
1182 Lo, PtrOff, DAG.getSrcValue(NULL)));
1185 MemOps.push_back(DAG.getNode(ISD::STORE, MVT::Other, Chain,
1186 Args[i].first, PtrOff,
1187 DAG.getSrcValue(NULL)));
1193 if (FPR_remaining > 0) {
1194 args_to_use.push_back(Args[i].first);
1197 SDOperand Store = DAG.getNode(ISD::STORE, MVT::Other, Chain,
1198 Args[i].first, PtrOff,
1199 DAG.getSrcValue(NULL));
1200 MemOps.push_back(Store);
1201 // Float varargs are always shadowed in available integer registers
1202 if (GPR_remaining > 0) {
1203 SDOperand Load = DAG.getLoad(MVT::i32, Store, PtrOff,
1204 DAG.getSrcValue(NULL));
1205 MemOps.push_back(Load.getValue(1));
1206 args_to_use.push_back(Load);
1209 if (GPR_remaining > 0 && MVT::f64 == ArgVT) {
1210 SDOperand ConstFour = DAG.getConstant(4, getPointerTy());
1211 PtrOff = DAG.getNode(ISD::ADD, MVT::i32, PtrOff, ConstFour);
1212 SDOperand Load = DAG.getLoad(MVT::i32, Store, PtrOff,
1213 DAG.getSrcValue(NULL));
1214 MemOps.push_back(Load.getValue(1));
1215 args_to_use.push_back(Load);
1219 // If we have any FPRs remaining, we may also have GPRs remaining.
1220 // Args passed in FPRs consume either 1 (f32) or 2 (f64) available
1222 if (GPR_remaining > 0) {
1223 args_to_use.push_back(DAG.getNode(ISD::UNDEF, MVT::i32));
1226 if (GPR_remaining > 0 && MVT::f64 == ArgVT) {
1227 args_to_use.push_back(DAG.getNode(ISD::UNDEF, MVT::i32));
1232 MemOps.push_back(DAG.getNode(ISD::STORE, MVT::Other, Chain,
1233 Args[i].first, PtrOff,
1234 DAG.getSrcValue(NULL)));
1236 ArgOffset += (ArgVT == MVT::f32) ? 4 : 8;
1240 if (!MemOps.empty())
1241 Chain = DAG.getNode(ISD::TokenFactor, MVT::Other, MemOps);
1244 std::vector<MVT::ValueType> RetVals;
1245 MVT::ValueType RetTyVT = getValueType(RetTy);
1246 MVT::ValueType ActualRetTyVT = RetTyVT;
1247 if (RetTyVT >= MVT::i1 && RetTyVT <= MVT::i16)
1248 ActualRetTyVT = MVT::i32; // Promote result to i32.
1250 if (RetTyVT == MVT::i64) {
1251 RetVals.push_back(MVT::i32);
1252 RetVals.push_back(MVT::i32);
1253 } else if (RetTyVT != MVT::isVoid) {
1254 RetVals.push_back(ActualRetTyVT);
1256 RetVals.push_back(MVT::Other);
1258 // If the callee is a GlobalAddress node (quite common, every direct call is)
1259 // turn it into a TargetGlobalAddress node so that legalize doesn't hack it.
1260 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
1261 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), MVT::i32);
1263 std::vector<SDOperand> Ops;
1264 Ops.push_back(Chain);
1265 Ops.push_back(Callee);
1266 Ops.insert(Ops.end(), args_to_use.begin(), args_to_use.end());
1267 SDOperand TheCall = DAG.getNode(PPCISD::CALL, RetVals, Ops);
1268 Chain = TheCall.getValue(TheCall.Val->getNumValues()-1);
1269 Chain = DAG.getNode(ISD::CALLSEQ_END, MVT::Other, Chain,
1270 DAG.getConstant(NumBytes, getPointerTy()));
1271 SDOperand RetVal = TheCall;
1273 // If the result is a small value, add a note so that we keep track of the
1274 // information about whether it is sign or zero extended.
1275 if (RetTyVT != ActualRetTyVT) {
1276 RetVal = DAG.getNode(RetTy->isSigned() ? ISD::AssertSext : ISD::AssertZext,
1277 MVT::i32, RetVal, DAG.getValueType(RetTyVT));
1278 RetVal = DAG.getNode(ISD::TRUNCATE, RetTyVT, RetVal);
1279 } else if (RetTyVT == MVT::i64) {
1280 RetVal = DAG.getNode(ISD::BUILD_PAIR, MVT::i64, RetVal, RetVal.getValue(1));
1283 return std::make_pair(RetVal, Chain);
1287 PPCTargetLowering::InsertAtEndOfBasicBlock(MachineInstr *MI,
1288 MachineBasicBlock *BB) {
1289 assert((MI->getOpcode() == PPC::SELECT_CC_Int ||
1290 MI->getOpcode() == PPC::SELECT_CC_F4 ||
1291 MI->getOpcode() == PPC::SELECT_CC_F8) &&
1292 "Unexpected instr type to insert");
1294 // To "insert" a SELECT_CC instruction, we actually have to insert the diamond
1295 // control-flow pattern. The incoming instruction knows the destination vreg
1296 // to set, the condition code register to branch on, the true/false values to
1297 // select between, and a branch opcode to use.
1298 const BasicBlock *LLVM_BB = BB->getBasicBlock();
1299 ilist<MachineBasicBlock>::iterator It = BB;
1305 // cmpTY ccX, r1, r2
1307 // fallthrough --> copy0MBB
1308 MachineBasicBlock *thisMBB = BB;
1309 MachineBasicBlock *copy0MBB = new MachineBasicBlock(LLVM_BB);
1310 MachineBasicBlock *sinkMBB = new MachineBasicBlock(LLVM_BB);
1311 BuildMI(BB, MI->getOperand(4).getImmedValue(), 2)
1312 .addReg(MI->getOperand(1).getReg()).addMBB(sinkMBB);
1313 MachineFunction *F = BB->getParent();
1314 F->getBasicBlockList().insert(It, copy0MBB);
1315 F->getBasicBlockList().insert(It, sinkMBB);
1316 // Update machine-CFG edges by first adding all successors of the current
1317 // block to the new block which will contain the Phi node for the select.
1318 for(MachineBasicBlock::succ_iterator i = BB->succ_begin(),
1319 e = BB->succ_end(); i != e; ++i)
1320 sinkMBB->addSuccessor(*i);
1321 // Next, remove all successors of the current block, and add the true
1322 // and fallthrough blocks as its successors.
1323 while(!BB->succ_empty())
1324 BB->removeSuccessor(BB->succ_begin());
1325 BB->addSuccessor(copy0MBB);
1326 BB->addSuccessor(sinkMBB);
1329 // %FalseValue = ...
1330 // # fallthrough to sinkMBB
1333 // Update machine-CFG edges
1334 BB->addSuccessor(sinkMBB);
1337 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
1340 BuildMI(BB, PPC::PHI, 4, MI->getOperand(0).getReg())
1341 .addReg(MI->getOperand(3).getReg()).addMBB(copy0MBB)
1342 .addReg(MI->getOperand(2).getReg()).addMBB(thisMBB);
1344 delete MI; // The pseudo instruction is gone now.
1348 SDOperand PPCTargetLowering::PerformDAGCombine(SDNode *N,
1349 DAGCombinerInfo &DCI) const {
1350 TargetMachine &TM = getTargetMachine();
1351 SelectionDAG &DAG = DCI.DAG;
1352 switch (N->getOpcode()) {
1354 case ISD::SINT_TO_FP:
1355 if (TM.getSubtarget<PPCSubtarget>().is64Bit()) {
1356 if (N->getOperand(0).getOpcode() == ISD::FP_TO_SINT) {
1357 // Turn (sint_to_fp (fp_to_sint X)) -> fctidz/fcfid without load/stores.
1358 // We allow the src/dst to be either f32/f64, but the intermediate
1359 // type must be i64.
1360 if (N->getOperand(0).getValueType() == MVT::i64) {
1361 SDOperand Val = N->getOperand(0).getOperand(0);
1362 if (Val.getValueType() == MVT::f32) {
1363 Val = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Val);
1364 DCI.AddToWorklist(Val.Val);
1367 Val = DAG.getNode(PPCISD::FCTIDZ, MVT::f64, Val);
1368 DCI.AddToWorklist(Val.Val);
1369 Val = DAG.getNode(PPCISD::FCFID, MVT::f64, Val);
1370 DCI.AddToWorklist(Val.Val);
1371 if (N->getValueType(0) == MVT::f32) {
1372 Val = DAG.getNode(ISD::FP_ROUND, MVT::f32, Val);
1373 DCI.AddToWorklist(Val.Val);
1376 } else if (N->getOperand(0).getValueType() == MVT::i32) {
1377 // If the intermediate type is i32, we can avoid the load/store here
1384 // Turn STORE (FP_TO_SINT F) -> STFIWX(FCTIWZ(F)).
1385 if (TM.getSubtarget<PPCSubtarget>().hasSTFIWX() &&
1386 N->getOperand(1).getOpcode() == ISD::FP_TO_SINT &&
1387 N->getOperand(1).getValueType() == MVT::i32) {
1388 SDOperand Val = N->getOperand(1).getOperand(0);
1389 if (Val.getValueType() == MVT::f32) {
1390 Val = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Val);
1391 DCI.AddToWorklist(Val.Val);
1393 Val = DAG.getNode(PPCISD::FCTIWZ, MVT::f64, Val);
1394 DCI.AddToWorklist(Val.Val);
1396 Val = DAG.getNode(PPCISD::STFIWX, MVT::Other, N->getOperand(0), Val,
1397 N->getOperand(2), N->getOperand(3));
1398 DCI.AddToWorklist(Val.Val);
1402 case PPCISD::VCMP: {
1403 // If a VCMPo node already exists with exactly the same operands as this
1404 // node, use its result instead of this node (VCMPo computes both a CR6 and
1405 // a normal output).
1407 if (!N->getOperand(0).hasOneUse() &&
1408 !N->getOperand(1).hasOneUse() &&
1409 !N->getOperand(2).hasOneUse()) {
1411 // Scan all of the users of the LHS, looking for VCMPo's that match.
1412 SDNode *VCMPoNode = 0;
1414 SDNode *LHSN = N->getOperand(0).Val;
1415 for (SDNode::use_iterator UI = LHSN->use_begin(), E = LHSN->use_end();
1417 if ((*UI)->getOpcode() == PPCISD::VCMPo &&
1418 (*UI)->getOperand(1) == N->getOperand(1) &&
1419 (*UI)->getOperand(2) == N->getOperand(2) &&
1420 (*UI)->getOperand(0) == N->getOperand(0)) {
1425 // If there are non-zero uses of the flag value, use the VCMPo node!
1426 if (VCMPoNode && !VCMPoNode->hasNUsesOfValue(0, 1))
1427 return SDOperand(VCMPoNode, 0);
1436 void PPCTargetLowering::computeMaskedBitsForTargetNode(const SDOperand Op,
1438 uint64_t &KnownZero,
1440 unsigned Depth) const {
1443 switch (Op.getOpcode()) {
1445 case ISD::INTRINSIC_WO_CHAIN: {
1446 switch (cast<ConstantSDNode>(Op.getOperand(0))->getValue()) {
1448 case Intrinsic::ppc_altivec_vcmpbfp_p:
1449 case Intrinsic::ppc_altivec_vcmpeqfp_p:
1450 case Intrinsic::ppc_altivec_vcmpequb_p:
1451 case Intrinsic::ppc_altivec_vcmpequh_p:
1452 case Intrinsic::ppc_altivec_vcmpequw_p:
1453 case Intrinsic::ppc_altivec_vcmpgefp_p:
1454 case Intrinsic::ppc_altivec_vcmpgtfp_p:
1455 case Intrinsic::ppc_altivec_vcmpgtsb_p:
1456 case Intrinsic::ppc_altivec_vcmpgtsh_p:
1457 case Intrinsic::ppc_altivec_vcmpgtsw_p:
1458 case Intrinsic::ppc_altivec_vcmpgtub_p:
1459 case Intrinsic::ppc_altivec_vcmpgtuh_p:
1460 case Intrinsic::ppc_altivec_vcmpgtuw_p:
1461 KnownZero = ~1U; // All bits but the low one are known to be zero.
1469 /// getConstraintType - Given a constraint letter, return the type of
1470 /// constraint it is for this target.
1471 PPCTargetLowering::ConstraintType
1472 PPCTargetLowering::getConstraintType(char ConstraintLetter) const {
1473 switch (ConstraintLetter) {
1480 return C_RegisterClass;
1482 return TargetLowering::getConstraintType(ConstraintLetter);
1486 std::vector<unsigned> PPCTargetLowering::
1487 getRegClassForInlineAsmConstraint(const std::string &Constraint,
1488 MVT::ValueType VT) const {
1489 if (Constraint.size() == 1) {
1490 switch (Constraint[0]) { // GCC RS6000 Constraint Letters
1491 default: break; // Unknown constriant letter
1493 return make_vector<unsigned>(/*no R0*/ PPC::R1 , PPC::R2 , PPC::R3 ,
1494 PPC::R4 , PPC::R5 , PPC::R6 , PPC::R7 ,
1495 PPC::R8 , PPC::R9 , PPC::R10, PPC::R11,
1496 PPC::R12, PPC::R13, PPC::R14, PPC::R15,
1497 PPC::R16, PPC::R17, PPC::R18, PPC::R19,
1498 PPC::R20, PPC::R21, PPC::R22, PPC::R23,
1499 PPC::R24, PPC::R25, PPC::R26, PPC::R27,
1500 PPC::R28, PPC::R29, PPC::R30, PPC::R31,
1503 return make_vector<unsigned>(PPC::R0 , PPC::R1 , PPC::R2 , PPC::R3 ,
1504 PPC::R4 , PPC::R5 , PPC::R6 , PPC::R7 ,
1505 PPC::R8 , PPC::R9 , PPC::R10, PPC::R11,
1506 PPC::R12, PPC::R13, PPC::R14, PPC::R15,
1507 PPC::R16, PPC::R17, PPC::R18, PPC::R19,
1508 PPC::R20, PPC::R21, PPC::R22, PPC::R23,
1509 PPC::R24, PPC::R25, PPC::R26, PPC::R27,
1510 PPC::R28, PPC::R29, PPC::R30, PPC::R31,
1513 return make_vector<unsigned>(PPC::F0 , PPC::F1 , PPC::F2 , PPC::F3 ,
1514 PPC::F4 , PPC::F5 , PPC::F6 , PPC::F7 ,
1515 PPC::F8 , PPC::F9 , PPC::F10, PPC::F11,
1516 PPC::F12, PPC::F13, PPC::F14, PPC::F15,
1517 PPC::F16, PPC::F17, PPC::F18, PPC::F19,
1518 PPC::F20, PPC::F21, PPC::F22, PPC::F23,
1519 PPC::F24, PPC::F25, PPC::F26, PPC::F27,
1520 PPC::F28, PPC::F29, PPC::F30, PPC::F31,
1523 return make_vector<unsigned>(PPC::V0 , PPC::V1 , PPC::V2 , PPC::V3 ,
1524 PPC::V4 , PPC::V5 , PPC::V6 , PPC::V7 ,
1525 PPC::V8 , PPC::V9 , PPC::V10, PPC::V11,
1526 PPC::V12, PPC::V13, PPC::V14, PPC::V15,
1527 PPC::V16, PPC::V17, PPC::V18, PPC::V19,
1528 PPC::V20, PPC::V21, PPC::V22, PPC::V23,
1529 PPC::V24, PPC::V25, PPC::V26, PPC::V27,
1530 PPC::V28, PPC::V29, PPC::V30, PPC::V31,
1533 return make_vector<unsigned>(PPC::CR0, PPC::CR1, PPC::CR2, PPC::CR3,
1534 PPC::CR4, PPC::CR5, PPC::CR6, PPC::CR7,
1539 return std::vector<unsigned>();
1542 // isOperandValidForConstraint
1543 bool PPCTargetLowering::
1544 isOperandValidForConstraint(SDOperand Op, char Letter) {
1555 if (!isa<ConstantSDNode>(Op)) return false; // Must be an immediate.
1556 unsigned Value = cast<ConstantSDNode>(Op)->getValue();
1558 default: assert(0 && "Unknown constraint letter!");
1559 case 'I': // "I" is a signed 16-bit constant.
1560 return (short)Value == (int)Value;
1561 case 'J': // "J" is a constant with only the high-order 16 bits nonzero.
1562 case 'L': // "L" is a signed 16-bit constant shifted left 16 bits.
1563 return (short)Value == 0;
1564 case 'K': // "K" is a constant with only the low-order 16 bits nonzero.
1565 return (Value >> 16) == 0;
1566 case 'M': // "M" is a constant that is greater than 31.
1568 case 'N': // "N" is a positive constant that is an exact power of two.
1569 return (int)Value > 0 && isPowerOf2_32(Value);
1570 case 'O': // "O" is the constant zero.
1572 case 'P': // "P" is a constant whose negation is a signed 16-bit constant.
1573 return (short)-Value == (int)-Value;
1579 // Handle standard constraint letters.
1580 return TargetLowering::isOperandValidForConstraint(Op, Letter);
1583 /// isLegalAddressImmediate - Return true if the integer value can be used
1584 /// as the offset of the target addressing mode.
1585 bool PPCTargetLowering::isLegalAddressImmediate(int64_t V) const {
1586 // PPC allows a sign-extended 16-bit immediate field.
1587 return (V > -(1 << 16) && V < (1 << 16)-1);