1 //===-- ARMISelLowering.cpp - ARM 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 //===----------------------------------------------------------------------===//
10 // This file defines the interfaces that ARM uses to lower LLVM code into a
13 //===----------------------------------------------------------------------===//
16 #include "ARMAddressingModes.h"
17 #include "ARMConstantPoolValue.h"
18 #include "ARMISelLowering.h"
19 #include "ARMMachineFunctionInfo.h"
20 #include "ARMRegisterInfo.h"
21 #include "ARMSubtarget.h"
22 #include "ARMTargetMachine.h"
23 #include "llvm/CallingConv.h"
24 #include "llvm/Constants.h"
25 #include "llvm/Instruction.h"
26 #include "llvm/Intrinsics.h"
27 #include "llvm/GlobalValue.h"
28 #include "llvm/CodeGen/MachineBasicBlock.h"
29 #include "llvm/CodeGen/MachineFrameInfo.h"
30 #include "llvm/CodeGen/MachineFunction.h"
31 #include "llvm/CodeGen/MachineInstrBuilder.h"
32 #include "llvm/CodeGen/MachineRegisterInfo.h"
33 #include "llvm/CodeGen/SelectionDAG.h"
34 #include "llvm/Target/TargetOptions.h"
35 #include "llvm/ADT/VectorExtras.h"
36 #include "llvm/Support/MathExtras.h"
39 ARMTargetLowering::ARMTargetLowering(TargetMachine &TM)
40 : TargetLowering(TM), ARMPCLabelIndex(0) {
41 Subtarget = &TM.getSubtarget<ARMSubtarget>();
43 if (Subtarget->isTargetDarwin()) {
45 setLibcallName(RTLIB::UINTTOFP_I64_F32, NULL);
46 setLibcallName(RTLIB::UINTTOFP_I64_F64, NULL);
48 // Uses VFP for Thumb libfuncs if available.
49 if (Subtarget->isThumb() && Subtarget->hasVFP2()) {
50 // Single-precision floating-point arithmetic.
51 setLibcallName(RTLIB::ADD_F32, "__addsf3vfp");
52 setLibcallName(RTLIB::SUB_F32, "__subsf3vfp");
53 setLibcallName(RTLIB::MUL_F32, "__mulsf3vfp");
54 setLibcallName(RTLIB::DIV_F32, "__divsf3vfp");
56 // Double-precision floating-point arithmetic.
57 setLibcallName(RTLIB::ADD_F64, "__adddf3vfp");
58 setLibcallName(RTLIB::SUB_F64, "__subdf3vfp");
59 setLibcallName(RTLIB::MUL_F64, "__muldf3vfp");
60 setLibcallName(RTLIB::DIV_F64, "__divdf3vfp");
62 // Single-precision comparisons.
63 setLibcallName(RTLIB::OEQ_F32, "__eqsf2vfp");
64 setLibcallName(RTLIB::UNE_F32, "__nesf2vfp");
65 setLibcallName(RTLIB::OLT_F32, "__ltsf2vfp");
66 setLibcallName(RTLIB::OLE_F32, "__lesf2vfp");
67 setLibcallName(RTLIB::OGE_F32, "__gesf2vfp");
68 setLibcallName(RTLIB::OGT_F32, "__gtsf2vfp");
69 setLibcallName(RTLIB::UO_F32, "__unordsf2vfp");
70 setLibcallName(RTLIB::O_F32, "__unordsf2vfp");
72 setCmpLibcallCC(RTLIB::OEQ_F32, ISD::SETNE);
73 setCmpLibcallCC(RTLIB::UNE_F32, ISD::SETNE);
74 setCmpLibcallCC(RTLIB::OLT_F32, ISD::SETNE);
75 setCmpLibcallCC(RTLIB::OLE_F32, ISD::SETNE);
76 setCmpLibcallCC(RTLIB::OGE_F32, ISD::SETNE);
77 setCmpLibcallCC(RTLIB::OGT_F32, ISD::SETNE);
78 setCmpLibcallCC(RTLIB::UO_F32, ISD::SETNE);
79 setCmpLibcallCC(RTLIB::O_F32, ISD::SETEQ);
81 // Double-precision comparisons.
82 setLibcallName(RTLIB::OEQ_F64, "__eqdf2vfp");
83 setLibcallName(RTLIB::UNE_F64, "__nedf2vfp");
84 setLibcallName(RTLIB::OLT_F64, "__ltdf2vfp");
85 setLibcallName(RTLIB::OLE_F64, "__ledf2vfp");
86 setLibcallName(RTLIB::OGE_F64, "__gedf2vfp");
87 setLibcallName(RTLIB::OGT_F64, "__gtdf2vfp");
88 setLibcallName(RTLIB::UO_F64, "__unorddf2vfp");
89 setLibcallName(RTLIB::O_F64, "__unorddf2vfp");
91 setCmpLibcallCC(RTLIB::OEQ_F64, ISD::SETNE);
92 setCmpLibcallCC(RTLIB::UNE_F64, ISD::SETNE);
93 setCmpLibcallCC(RTLIB::OLT_F64, ISD::SETNE);
94 setCmpLibcallCC(RTLIB::OLE_F64, ISD::SETNE);
95 setCmpLibcallCC(RTLIB::OGE_F64, ISD::SETNE);
96 setCmpLibcallCC(RTLIB::OGT_F64, ISD::SETNE);
97 setCmpLibcallCC(RTLIB::UO_F64, ISD::SETNE);
98 setCmpLibcallCC(RTLIB::O_F64, ISD::SETEQ);
100 // Floating-point to integer conversions.
101 // i64 conversions are done via library routines even when generating VFP
102 // instructions, so use the same ones.
103 setLibcallName(RTLIB::FPTOSINT_F64_I32, "__fixdfsivfp");
104 setLibcallName(RTLIB::FPTOUINT_F64_I32, "__fixunsdfsivfp");
105 setLibcallName(RTLIB::FPTOSINT_F32_I32, "__fixsfsivfp");
106 setLibcallName(RTLIB::FPTOUINT_F32_I32, "__fixunssfsivfp");
108 // Conversions between floating types.
109 setLibcallName(RTLIB::FPROUND_F64_F32, "__truncdfsf2vfp");
110 setLibcallName(RTLIB::FPEXT_F32_F64, "__extendsfdf2vfp");
112 // Integer to floating-point conversions.
113 // i64 conversions are done via library routines even when generating VFP
114 // instructions, so use the same ones.
115 // FIXME: There appears to be some naming inconsistency in ARM libgcc: e.g.
116 // __floatunsidf vs. __floatunssidfvfp.
117 setLibcallName(RTLIB::SINTTOFP_I32_F64, "__floatsidfvfp");
118 setLibcallName(RTLIB::UINTTOFP_I32_F64, "__floatunssidfvfp");
119 setLibcallName(RTLIB::SINTTOFP_I32_F32, "__floatsisfvfp");
120 setLibcallName(RTLIB::UINTTOFP_I32_F32, "__floatunssisfvfp");
124 addRegisterClass(MVT::i32, ARM::GPRRegisterClass);
125 if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb()) {
126 addRegisterClass(MVT::f32, ARM::SPRRegisterClass);
127 addRegisterClass(MVT::f64, ARM::DPRRegisterClass);
129 setTruncStoreAction(MVT::f64, MVT::f32, Expand);
131 computeRegisterProperties();
133 // ARM does not have f32 extending load.
134 setLoadXAction(ISD::EXTLOAD, MVT::f32, Expand);
136 // ARM does not have i1 sign extending load.
137 setLoadXAction(ISD::SEXTLOAD, MVT::i1, Promote);
139 // ARM supports all 4 flavors of integer indexed load / store.
140 for (unsigned im = (unsigned)ISD::PRE_INC;
141 im != (unsigned)ISD::LAST_INDEXED_MODE; ++im) {
142 setIndexedLoadAction(im, MVT::i1, Legal);
143 setIndexedLoadAction(im, MVT::i8, Legal);
144 setIndexedLoadAction(im, MVT::i16, Legal);
145 setIndexedLoadAction(im, MVT::i32, Legal);
146 setIndexedStoreAction(im, MVT::i1, Legal);
147 setIndexedStoreAction(im, MVT::i8, Legal);
148 setIndexedStoreAction(im, MVT::i16, Legal);
149 setIndexedStoreAction(im, MVT::i32, Legal);
152 // i64 operation support.
153 if (Subtarget->isThumb()) {
154 setOperationAction(ISD::MUL, MVT::i64, Expand);
155 setOperationAction(ISD::MULHU, MVT::i32, Expand);
156 setOperationAction(ISD::MULHS, MVT::i32, Expand);
157 setOperationAction(ISD::UMUL_LOHI, MVT::i32, Expand);
158 setOperationAction(ISD::SMUL_LOHI, MVT::i32, Expand);
160 setOperationAction(ISD::MUL, MVT::i64, Expand);
161 setOperationAction(ISD::MULHU, MVT::i32, Expand);
162 if (!Subtarget->hasV6Ops())
163 setOperationAction(ISD::MULHS, MVT::i32, Expand);
165 setOperationAction(ISD::SHL_PARTS, MVT::i32, Expand);
166 setOperationAction(ISD::SRA_PARTS, MVT::i32, Expand);
167 setOperationAction(ISD::SRL_PARTS, MVT::i32, Expand);
168 setOperationAction(ISD::SRL, MVT::i64, Custom);
169 setOperationAction(ISD::SRA, MVT::i64, Custom);
171 // ARM does not have ROTL.
172 setOperationAction(ISD::ROTL, MVT::i32, Expand);
173 setOperationAction(ISD::CTTZ , MVT::i32, Expand);
174 setOperationAction(ISD::CTPOP, MVT::i32, Expand);
175 if (!Subtarget->hasV5TOps() || Subtarget->isThumb())
176 setOperationAction(ISD::CTLZ, MVT::i32, Expand);
178 // Only ARMv6 has BSWAP.
179 if (!Subtarget->hasV6Ops())
180 setOperationAction(ISD::BSWAP, MVT::i32, Expand);
182 // These are expanded into libcalls.
183 setOperationAction(ISD::SDIV, MVT::i32, Expand);
184 setOperationAction(ISD::UDIV, MVT::i32, Expand);
185 setOperationAction(ISD::SREM, MVT::i32, Expand);
186 setOperationAction(ISD::UREM, MVT::i32, Expand);
187 setOperationAction(ISD::SDIVREM, MVT::i32, Expand);
188 setOperationAction(ISD::UDIVREM, MVT::i32, Expand);
190 // Support label based line numbers.
191 setOperationAction(ISD::LOCATION, MVT::Other, Expand);
192 setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
194 setOperationAction(ISD::RET, MVT::Other, Custom);
195 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
196 setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
197 setOperationAction(ISD::GLOBAL_OFFSET_TABLE, MVT::i32, Custom);
198 setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom);
200 // Expand mem operations genericly.
201 setOperationAction(ISD::MEMSET , MVT::Other, Expand);
202 setOperationAction(ISD::MEMCPY , MVT::Other, Custom);
203 setOperationAction(ISD::MEMMOVE , MVT::Other, Expand);
205 // Use the default implementation.
206 setOperationAction(ISD::VASTART , MVT::Other, Custom);
207 setOperationAction(ISD::VAARG , MVT::Other, Expand);
208 setOperationAction(ISD::VACOPY , MVT::Other, Expand);
209 setOperationAction(ISD::VAEND , MVT::Other, Expand);
210 setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
211 setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
212 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32 , Expand);
214 if (!Subtarget->hasV6Ops()) {
215 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16, Expand);
216 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8, Expand);
218 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
220 if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb())
221 // Turn f64->i64 into FMRRD iff target supports vfp2.
222 setOperationAction(ISD::BIT_CONVERT, MVT::i64, Custom);
224 // We want to custom lower some of our intrinsics.
225 setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
227 setOperationAction(ISD::SETCC , MVT::i32, Expand);
228 setOperationAction(ISD::SETCC , MVT::f32, Expand);
229 setOperationAction(ISD::SETCC , MVT::f64, Expand);
230 setOperationAction(ISD::SELECT , MVT::i32, Expand);
231 setOperationAction(ISD::SELECT , MVT::f32, Expand);
232 setOperationAction(ISD::SELECT , MVT::f64, Expand);
233 setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
234 setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
235 setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
237 setOperationAction(ISD::BRCOND , MVT::Other, Expand);
238 setOperationAction(ISD::BR_CC , MVT::i32, Custom);
239 setOperationAction(ISD::BR_CC , MVT::f32, Custom);
240 setOperationAction(ISD::BR_CC , MVT::f64, Custom);
241 setOperationAction(ISD::BR_JT , MVT::Other, Custom);
243 // FP Constants can't be immediates.
244 setOperationAction(ISD::ConstantFP, MVT::f64, Expand);
245 setOperationAction(ISD::ConstantFP, MVT::f32, Expand);
247 // We don't support sin/cos/fmod/copysign/pow
248 setOperationAction(ISD::FSIN , MVT::f64, Expand);
249 setOperationAction(ISD::FSIN , MVT::f32, Expand);
250 setOperationAction(ISD::FCOS , MVT::f32, Expand);
251 setOperationAction(ISD::FCOS , MVT::f64, Expand);
252 setOperationAction(ISD::FREM , MVT::f64, Expand);
253 setOperationAction(ISD::FREM , MVT::f32, Expand);
254 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Custom);
255 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Custom);
256 setOperationAction(ISD::FPOW , MVT::f64, Expand);
257 setOperationAction(ISD::FPOW , MVT::f32, Expand);
259 // int <-> fp are custom expanded into bit_convert + ARMISD ops.
260 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
261 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Custom);
262 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Custom);
263 setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
265 // We have target-specific dag combine patterns for the following nodes:
266 // ARMISD::FMRRD - No need to call setTargetDAGCombine
268 setStackPointerRegisterToSaveRestore(ARM::SP);
269 setSchedulingPreference(SchedulingForRegPressure);
270 setIfCvtBlockSizeLimit(Subtarget->isThumb() ? 0 : 10);
271 setIfCvtDupBlockSizeLimit(Subtarget->isThumb() ? 0 : 2);
273 maxStoresPerMemcpy = 1; //// temporary - rewrite interface to use type
277 const char *ARMTargetLowering::getTargetNodeName(unsigned Opcode) const {
280 case ARMISD::Wrapper: return "ARMISD::Wrapper";
281 case ARMISD::WrapperJT: return "ARMISD::WrapperJT";
282 case ARMISD::CALL: return "ARMISD::CALL";
283 case ARMISD::CALL_PRED: return "ARMISD::CALL_PRED";
284 case ARMISD::CALL_NOLINK: return "ARMISD::CALL_NOLINK";
285 case ARMISD::tCALL: return "ARMISD::tCALL";
286 case ARMISD::BRCOND: return "ARMISD::BRCOND";
287 case ARMISD::BR_JT: return "ARMISD::BR_JT";
288 case ARMISD::RET_FLAG: return "ARMISD::RET_FLAG";
289 case ARMISD::PIC_ADD: return "ARMISD::PIC_ADD";
290 case ARMISD::CMP: return "ARMISD::CMP";
291 case ARMISD::CMPNZ: return "ARMISD::CMPNZ";
292 case ARMISD::CMPFP: return "ARMISD::CMPFP";
293 case ARMISD::CMPFPw0: return "ARMISD::CMPFPw0";
294 case ARMISD::FMSTAT: return "ARMISD::FMSTAT";
295 case ARMISD::CMOV: return "ARMISD::CMOV";
296 case ARMISD::CNEG: return "ARMISD::CNEG";
298 case ARMISD::FTOSI: return "ARMISD::FTOSI";
299 case ARMISD::FTOUI: return "ARMISD::FTOUI";
300 case ARMISD::SITOF: return "ARMISD::SITOF";
301 case ARMISD::UITOF: return "ARMISD::UITOF";
303 case ARMISD::SRL_FLAG: return "ARMISD::SRL_FLAG";
304 case ARMISD::SRA_FLAG: return "ARMISD::SRA_FLAG";
305 case ARMISD::RRX: return "ARMISD::RRX";
307 case ARMISD::FMRRD: return "ARMISD::FMRRD";
308 case ARMISD::FMDRR: return "ARMISD::FMDRR";
310 case ARMISD::THREAD_POINTER:return "ARMISD::THREAD_POINTER";
314 //===----------------------------------------------------------------------===//
316 //===----------------------------------------------------------------------===//
319 /// IntCCToARMCC - Convert a DAG integer condition code to an ARM CC
320 static ARMCC::CondCodes IntCCToARMCC(ISD::CondCode CC) {
322 default: assert(0 && "Unknown condition code!");
323 case ISD::SETNE: return ARMCC::NE;
324 case ISD::SETEQ: return ARMCC::EQ;
325 case ISD::SETGT: return ARMCC::GT;
326 case ISD::SETGE: return ARMCC::GE;
327 case ISD::SETLT: return ARMCC::LT;
328 case ISD::SETLE: return ARMCC::LE;
329 case ISD::SETUGT: return ARMCC::HI;
330 case ISD::SETUGE: return ARMCC::HS;
331 case ISD::SETULT: return ARMCC::LO;
332 case ISD::SETULE: return ARMCC::LS;
336 /// FPCCToARMCC - Convert a DAG fp condition code to an ARM CC. It
337 /// returns true if the operands should be inverted to form the proper
339 static bool FPCCToARMCC(ISD::CondCode CC, ARMCC::CondCodes &CondCode,
340 ARMCC::CondCodes &CondCode2) {
342 CondCode2 = ARMCC::AL;
344 default: assert(0 && "Unknown FP condition!");
346 case ISD::SETOEQ: CondCode = ARMCC::EQ; break;
348 case ISD::SETOGT: CondCode = ARMCC::GT; break;
350 case ISD::SETOGE: CondCode = ARMCC::GE; break;
351 case ISD::SETOLT: CondCode = ARMCC::MI; break;
352 case ISD::SETOLE: CondCode = ARMCC::GT; Invert = true; break;
353 case ISD::SETONE: CondCode = ARMCC::MI; CondCode2 = ARMCC::GT; break;
354 case ISD::SETO: CondCode = ARMCC::VC; break;
355 case ISD::SETUO: CondCode = ARMCC::VS; break;
356 case ISD::SETUEQ: CondCode = ARMCC::EQ; CondCode2 = ARMCC::VS; break;
357 case ISD::SETUGT: CondCode = ARMCC::HI; break;
358 case ISD::SETUGE: CondCode = ARMCC::PL; break;
360 case ISD::SETULT: CondCode = ARMCC::LT; break;
362 case ISD::SETULE: CondCode = ARMCC::LE; break;
364 case ISD::SETUNE: CondCode = ARMCC::NE; break;
370 HowToPassArgument(MVT::ValueType ObjectVT, unsigned NumGPRs,
371 unsigned StackOffset, unsigned &NeededGPRs,
372 unsigned &NeededStackSize, unsigned &GPRPad,
373 unsigned &StackPad, unsigned Flags) {
378 unsigned align = (Flags >> ISD::ParamFlags::OrigAlignmentOffs);
379 GPRPad = NumGPRs % ((align + 3)/4);
380 StackPad = StackOffset % align;
381 unsigned firstGPR = NumGPRs + GPRPad;
383 default: assert(0 && "Unhandled argument type!");
395 else if (firstGPR == 3) {
403 /// LowerCALL - Lowering a ISD::CALL node into a callseq_start <-
404 /// ARMISD:CALL <- callseq_end chain. Also add input and output parameter
406 SDOperand ARMTargetLowering::LowerCALL(SDOperand Op, SelectionDAG &DAG) {
407 MVT::ValueType RetVT= Op.Val->getValueType(0);
408 SDOperand Chain = Op.getOperand(0);
409 unsigned CallConv = cast<ConstantSDNode>(Op.getOperand(1))->getValue();
410 assert((CallConv == CallingConv::C ||
411 CallConv == CallingConv::Fast) && "unknown calling convention");
412 SDOperand Callee = Op.getOperand(4);
413 unsigned NumOps = (Op.getNumOperands() - 5) / 2;
414 unsigned ArgOffset = 0; // Frame mechanisms handle retaddr slot
415 unsigned NumGPRs = 0; // GPRs used for parameter passing.
417 // Count how many bytes are to be pushed on the stack.
418 unsigned NumBytes = 0;
420 // Add up all the space actually used.
421 for (unsigned i = 0; i < NumOps; ++i) {
426 MVT::ValueType ObjectVT = Op.getOperand(5+2*i).getValueType();
427 unsigned Flags = Op.getConstantOperandVal(5+2*i+1);
428 HowToPassArgument(ObjectVT, NumGPRs, NumBytes, ObjGPRs, ObjSize,
429 GPRPad, StackPad, Flags);
430 NumBytes += ObjSize + StackPad;
431 NumGPRs += ObjGPRs + GPRPad;
434 // Adjust the stack pointer for the new arguments...
435 // These operations are automatically eliminated by the prolog/epilog pass
436 Chain = DAG.getCALLSEQ_START(Chain,
437 DAG.getConstant(NumBytes, MVT::i32));
439 SDOperand StackPtr = DAG.getRegister(ARM::SP, MVT::i32);
441 static const unsigned GPRArgRegs[] = {
442 ARM::R0, ARM::R1, ARM::R2, ARM::R3
446 std::vector<std::pair<unsigned, SDOperand> > RegsToPass;
447 std::vector<SDOperand> MemOpChains;
448 for (unsigned i = 0; i != NumOps; ++i) {
449 SDOperand Arg = Op.getOperand(5+2*i);
450 unsigned Flags = Op.getConstantOperandVal(5+2*i+1);
451 MVT::ValueType ArgVT = Arg.getValueType();
457 HowToPassArgument(ArgVT, NumGPRs, ArgOffset, ObjGPRs,
458 ObjSize, GPRPad, StackPad, Flags);
460 ArgOffset += StackPad;
463 default: assert(0 && "Unexpected ValueType for argument!");
465 RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs], Arg));
468 RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs],
469 DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Arg)));
472 SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Arg,
473 DAG.getConstant(0, getPointerTy()));
474 SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Arg,
475 DAG.getConstant(1, getPointerTy()));
476 RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs], Lo));
478 RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs+1], Hi));
480 SDOperand PtrOff= DAG.getConstant(ArgOffset, StackPtr.getValueType());
481 PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff);
482 MemOpChains.push_back(DAG.getStore(Chain, Hi, PtrOff, NULL, 0));
487 SDOperand Cvt = DAG.getNode(ARMISD::FMRRD,
488 DAG.getVTList(MVT::i32, MVT::i32),
490 RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs], Cvt));
492 RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs+1],
495 SDOperand PtrOff= DAG.getConstant(ArgOffset, StackPtr.getValueType());
496 PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff);
497 MemOpChains.push_back(DAG.getStore(Chain, Cvt.getValue(1), PtrOff,
504 assert(ObjSize != 0);
505 SDOperand PtrOff = DAG.getConstant(ArgOffset, StackPtr.getValueType());
506 PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff);
507 MemOpChains.push_back(DAG.getStore(Chain, Arg, PtrOff, NULL, 0));
511 ArgOffset += ObjSize;
514 if (!MemOpChains.empty())
515 Chain = DAG.getNode(ISD::TokenFactor, MVT::Other,
516 &MemOpChains[0], MemOpChains.size());
518 // Build a sequence of copy-to-reg nodes chained together with token chain
519 // and flag operands which copy the outgoing args into the appropriate regs.
521 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
522 Chain = DAG.getCopyToReg(Chain, RegsToPass[i].first, RegsToPass[i].second,
524 InFlag = Chain.getValue(1);
527 // If the callee is a GlobalAddress/ExternalSymbol node (quite common, every
528 // direct call is) turn it into a TargetGlobalAddress/TargetExternalSymbol
529 // node so that legalize doesn't hack it.
530 bool isDirect = false;
531 bool isARMFunc = false;
532 bool isLocalARMFunc = false;
533 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
534 GlobalValue *GV = G->getGlobal();
536 bool isExt = (GV->isDeclaration() || GV->hasWeakLinkage() ||
537 GV->hasLinkOnceLinkage());
538 bool isStub = (isExt && Subtarget->isTargetDarwin()) &&
539 getTargetMachine().getRelocationModel() != Reloc::Static;
540 isARMFunc = !Subtarget->isThumb() || isStub;
541 // ARM call to a local ARM function is predicable.
542 isLocalARMFunc = !Subtarget->isThumb() && !isExt;
543 // tBX takes a register source operand.
544 if (isARMFunc && Subtarget->isThumb() && !Subtarget->hasV5TOps()) {
545 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(GV, ARMPCLabelIndex,
547 SDOperand CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 2);
548 CPAddr = DAG.getNode(ARMISD::Wrapper, MVT::i32, CPAddr);
549 Callee = DAG.getLoad(getPointerTy(), DAG.getEntryNode(), CPAddr, NULL, 0);
550 SDOperand PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
551 Callee = DAG.getNode(ARMISD::PIC_ADD, getPointerTy(), Callee, PICLabel);
553 Callee = DAG.getTargetGlobalAddress(GV, getPointerTy());
554 } else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) {
556 bool isStub = Subtarget->isTargetDarwin() &&
557 getTargetMachine().getRelocationModel() != Reloc::Static;
558 isARMFunc = !Subtarget->isThumb() || isStub;
559 // tBX takes a register source operand.
560 const char *Sym = S->getSymbol();
561 if (isARMFunc && Subtarget->isThumb() && !Subtarget->hasV5TOps()) {
562 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(Sym, ARMPCLabelIndex,
564 SDOperand CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 2);
565 CPAddr = DAG.getNode(ARMISD::Wrapper, MVT::i32, CPAddr);
566 Callee = DAG.getLoad(getPointerTy(), DAG.getEntryNode(), CPAddr, NULL, 0);
567 SDOperand PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
568 Callee = DAG.getNode(ARMISD::PIC_ADD, getPointerTy(), Callee, PICLabel);
570 Callee = DAG.getTargetExternalSymbol(Sym, getPointerTy());
573 // FIXME: handle tail calls differently.
575 if (Subtarget->isThumb()) {
576 if (!Subtarget->hasV5TOps() && (!isDirect || isARMFunc))
577 CallOpc = ARMISD::CALL_NOLINK;
579 CallOpc = isARMFunc ? ARMISD::CALL : ARMISD::tCALL;
581 CallOpc = (isDirect || Subtarget->hasV5TOps())
582 ? (isLocalARMFunc ? ARMISD::CALL_PRED : ARMISD::CALL)
583 : ARMISD::CALL_NOLINK;
585 if (CallOpc == ARMISD::CALL_NOLINK && !Subtarget->isThumb()) {
586 // implicit def LR - LR mustn't be allocated as GRP:$dst of CALL_NOLINK
587 Chain = DAG.getCopyToReg(Chain, ARM::LR,
588 DAG.getNode(ISD::UNDEF, MVT::i32), InFlag);
589 InFlag = Chain.getValue(1);
592 std::vector<MVT::ValueType> NodeTys;
593 NodeTys.push_back(MVT::Other); // Returns a chain
594 NodeTys.push_back(MVT::Flag); // Returns a flag for retval copy to use.
596 std::vector<SDOperand> Ops;
597 Ops.push_back(Chain);
598 Ops.push_back(Callee);
600 // Add argument registers to the end of the list so that they are known live
602 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
603 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
604 RegsToPass[i].second.getValueType()));
607 Ops.push_back(InFlag);
608 Chain = DAG.getNode(CallOpc, NodeTys, &Ops[0], Ops.size());
609 InFlag = Chain.getValue(1);
611 Chain = DAG.getCALLSEQ_END(Chain,
612 DAG.getConstant(NumBytes, MVT::i32),
613 DAG.getConstant(0, MVT::i32),
615 if (RetVT != MVT::Other)
616 InFlag = Chain.getValue(1);
618 std::vector<SDOperand> ResultVals;
621 // If the call has results, copy the values out of the ret val registers.
623 default: assert(0 && "Unexpected ret value!");
627 Chain = DAG.getCopyFromReg(Chain, ARM::R0, MVT::i32, InFlag).getValue(1);
628 ResultVals.push_back(Chain.getValue(0));
629 if (Op.Val->getValueType(1) == MVT::i32) {
630 // Returns a i64 value.
631 Chain = DAG.getCopyFromReg(Chain, ARM::R1, MVT::i32,
632 Chain.getValue(2)).getValue(1);
633 ResultVals.push_back(Chain.getValue(0));
634 NodeTys.push_back(MVT::i32);
636 NodeTys.push_back(MVT::i32);
639 Chain = DAG.getCopyFromReg(Chain, ARM::R0, MVT::i32, InFlag).getValue(1);
640 ResultVals.push_back(DAG.getNode(ISD::BIT_CONVERT, MVT::f32,
642 NodeTys.push_back(MVT::f32);
645 SDOperand Lo = DAG.getCopyFromReg(Chain, ARM::R0, MVT::i32, InFlag);
646 SDOperand Hi = DAG.getCopyFromReg(Lo, ARM::R1, MVT::i32, Lo.getValue(2));
647 ResultVals.push_back(DAG.getNode(ARMISD::FMDRR, MVT::f64, Lo, Hi));
648 NodeTys.push_back(MVT::f64);
653 NodeTys.push_back(MVT::Other);
655 if (ResultVals.empty())
658 ResultVals.push_back(Chain);
659 SDOperand Res = DAG.getNode(ISD::MERGE_VALUES, NodeTys, &ResultVals[0],
661 return Res.getValue(Op.ResNo);
664 static SDOperand LowerRET(SDOperand Op, SelectionDAG &DAG) {
666 SDOperand Chain = Op.getOperand(0);
667 switch(Op.getNumOperands()) {
669 assert(0 && "Do not know how to return this many arguments!");
672 SDOperand LR = DAG.getRegister(ARM::LR, MVT::i32);
673 return DAG.getNode(ARMISD::RET_FLAG, MVT::Other, Chain);
676 Op = Op.getOperand(1);
677 if (Op.getValueType() == MVT::f32) {
678 Op = DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Op);
679 } else if (Op.getValueType() == MVT::f64) {
680 // Legalize ret f64 -> ret 2 x i32. We always have fmrrd if f64 is
682 Op = DAG.getNode(ARMISD::FMRRD, DAG.getVTList(MVT::i32, MVT::i32), &Op,1);
683 SDOperand Sign = DAG.getConstant(0, MVT::i32);
684 return DAG.getNode(ISD::RET, MVT::Other, Chain, Op, Sign,
685 Op.getValue(1), Sign);
687 Copy = DAG.getCopyToReg(Chain, ARM::R0, Op, SDOperand());
688 if (DAG.getMachineFunction().getRegInfo().liveout_empty())
689 DAG.getMachineFunction().getRegInfo().addLiveOut(ARM::R0);
692 Copy = DAG.getCopyToReg(Chain, ARM::R1, Op.getOperand(3), SDOperand());
693 Copy = DAG.getCopyToReg(Copy, ARM::R0, Op.getOperand(1), Copy.getValue(1));
694 // If we haven't noted the R0+R1 are live out, do so now.
695 if (DAG.getMachineFunction().getRegInfo().liveout_empty()) {
696 DAG.getMachineFunction().getRegInfo().addLiveOut(ARM::R0);
697 DAG.getMachineFunction().getRegInfo().addLiveOut(ARM::R1);
702 //We must use RET_FLAG instead of BRIND because BRIND doesn't have a flag
703 return DAG.getNode(ARMISD::RET_FLAG, MVT::Other, Copy, Copy.getValue(1));
706 // ConstantPool, JumpTable, GlobalAddress, and ExternalSymbol are lowered as
707 // their target countpart wrapped in the ARMISD::Wrapper node. Suppose N is
708 // one of the above mentioned nodes. It has to be wrapped because otherwise
709 // Select(N) returns N. So the raw TargetGlobalAddress nodes, etc. can only
710 // be used to form addressing mode. These wrapped nodes will be selected
712 static SDOperand LowerConstantPool(SDOperand Op, SelectionDAG &DAG) {
713 MVT::ValueType PtrVT = Op.getValueType();
714 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
716 if (CP->isMachineConstantPoolEntry())
717 Res = DAG.getTargetConstantPool(CP->getMachineCPVal(), PtrVT,
720 Res = DAG.getTargetConstantPool(CP->getConstVal(), PtrVT,
722 return DAG.getNode(ARMISD::Wrapper, MVT::i32, Res);
725 // Lower ISD::GlobalTLSAddress using the "general dynamic" model
727 ARMTargetLowering::LowerToTLSGeneralDynamicModel(GlobalAddressSDNode *GA,
729 MVT::ValueType PtrVT = getPointerTy();
730 unsigned char PCAdj = Subtarget->isThumb() ? 4 : 8;
731 ARMConstantPoolValue *CPV =
732 new ARMConstantPoolValue(GA->getGlobal(), ARMPCLabelIndex, ARMCP::CPValue,
733 PCAdj, "tlsgd", true);
734 SDOperand Argument = DAG.getTargetConstantPool(CPV, PtrVT, 2);
735 Argument = DAG.getNode(ARMISD::Wrapper, MVT::i32, Argument);
736 Argument = DAG.getLoad(PtrVT, DAG.getEntryNode(), Argument, NULL, 0);
737 SDOperand Chain = Argument.getValue(1);
739 SDOperand PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
740 Argument = DAG.getNode(ARMISD::PIC_ADD, PtrVT, Argument, PICLabel);
742 // call __tls_get_addr.
745 Entry.Node = Argument;
746 Entry.Ty = (const Type *) Type::Int32Ty;
747 Args.push_back(Entry);
748 std::pair<SDOperand, SDOperand> CallResult =
749 LowerCallTo(Chain, (const Type *) Type::Int32Ty, false, false,
750 CallingConv::C, false,
751 DAG.getExternalSymbol("__tls_get_addr", PtrVT), Args, DAG);
752 return CallResult.first;
755 // Lower ISD::GlobalTLSAddress using the "initial exec" or
756 // "local exec" model.
758 ARMTargetLowering::LowerToTLSExecModels(GlobalAddressSDNode *GA,
760 GlobalValue *GV = GA->getGlobal();
762 SDOperand Chain = DAG.getEntryNode();
763 MVT::ValueType PtrVT = getPointerTy();
764 // Get the Thread Pointer
765 SDOperand ThreadPointer = DAG.getNode(ARMISD::THREAD_POINTER, PtrVT);
767 if (GV->isDeclaration()){
768 // initial exec model
769 unsigned char PCAdj = Subtarget->isThumb() ? 4 : 8;
770 ARMConstantPoolValue *CPV =
771 new ARMConstantPoolValue(GA->getGlobal(), ARMPCLabelIndex, ARMCP::CPValue,
772 PCAdj, "gottpoff", true);
773 Offset = DAG.getTargetConstantPool(CPV, PtrVT, 2);
774 Offset = DAG.getNode(ARMISD::Wrapper, MVT::i32, Offset);
775 Offset = DAG.getLoad(PtrVT, Chain, Offset, NULL, 0);
776 Chain = Offset.getValue(1);
778 SDOperand PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
779 Offset = DAG.getNode(ARMISD::PIC_ADD, PtrVT, Offset, PICLabel);
781 Offset = DAG.getLoad(PtrVT, Chain, Offset, NULL, 0);
784 ARMConstantPoolValue *CPV =
785 new ARMConstantPoolValue(GV, ARMCP::CPValue, "tpoff");
786 Offset = DAG.getTargetConstantPool(CPV, PtrVT, 2);
787 Offset = DAG.getNode(ARMISD::Wrapper, MVT::i32, Offset);
788 Offset = DAG.getLoad(PtrVT, Chain, Offset, NULL, 0);
791 // The address of the thread local variable is the add of the thread
792 // pointer with the offset of the variable.
793 return DAG.getNode(ISD::ADD, PtrVT, ThreadPointer, Offset);
797 ARMTargetLowering::LowerGlobalTLSAddress(SDOperand Op, SelectionDAG &DAG) {
798 // TODO: implement the "local dynamic" model
799 assert(Subtarget->isTargetELF() &&
800 "TLS not implemented for non-ELF targets");
801 GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(Op);
802 // If the relocation model is PIC, use the "General Dynamic" TLS Model,
803 // otherwise use the "Local Exec" TLS Model
804 if (getTargetMachine().getRelocationModel() == Reloc::PIC_)
805 return LowerToTLSGeneralDynamicModel(GA, DAG);
807 return LowerToTLSExecModels(GA, DAG);
810 SDOperand ARMTargetLowering::LowerGlobalAddressELF(SDOperand Op,
812 MVT::ValueType PtrVT = getPointerTy();
813 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
814 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
815 if (RelocM == Reloc::PIC_) {
816 bool UseGOTOFF = GV->hasInternalLinkage() || GV->hasHiddenVisibility();
817 ARMConstantPoolValue *CPV =
818 new ARMConstantPoolValue(GV, ARMCP::CPValue, UseGOTOFF ? "GOTOFF":"GOT");
819 SDOperand CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 2);
820 CPAddr = DAG.getNode(ARMISD::Wrapper, MVT::i32, CPAddr);
821 SDOperand Result = DAG.getLoad(PtrVT, DAG.getEntryNode(), CPAddr, NULL, 0);
822 SDOperand Chain = Result.getValue(1);
823 SDOperand GOT = DAG.getNode(ISD::GLOBAL_OFFSET_TABLE, PtrVT);
824 Result = DAG.getNode(ISD::ADD, PtrVT, Result, GOT);
826 Result = DAG.getLoad(PtrVT, Chain, Result, NULL, 0);
829 SDOperand CPAddr = DAG.getTargetConstantPool(GV, PtrVT, 2);
830 CPAddr = DAG.getNode(ARMISD::Wrapper, MVT::i32, CPAddr);
831 return DAG.getLoad(PtrVT, DAG.getEntryNode(), CPAddr, NULL, 0);
835 /// GVIsIndirectSymbol - true if the GV will be accessed via an indirect symbol
836 /// even in non-static mode.
837 static bool GVIsIndirectSymbol(GlobalValue *GV, Reloc::Model RelocM) {
838 return RelocM != Reloc::Static &&
839 (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() ||
840 (GV->isDeclaration() && !GV->hasNotBeenReadFromBitcode()));
843 SDOperand ARMTargetLowering::LowerGlobalAddressDarwin(SDOperand Op,
845 MVT::ValueType PtrVT = getPointerTy();
846 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
847 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
848 bool IsIndirect = GVIsIndirectSymbol(GV, RelocM);
850 if (RelocM == Reloc::Static)
851 CPAddr = DAG.getTargetConstantPool(GV, PtrVT, 2);
853 unsigned PCAdj = (RelocM != Reloc::PIC_)
854 ? 0 : (Subtarget->isThumb() ? 4 : 8);
855 ARMCP::ARMCPKind Kind = IsIndirect ? ARMCP::CPNonLazyPtr
857 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(GV, ARMPCLabelIndex,
859 CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 2);
861 CPAddr = DAG.getNode(ARMISD::Wrapper, MVT::i32, CPAddr);
863 SDOperand Result = DAG.getLoad(PtrVT, DAG.getEntryNode(), CPAddr, NULL, 0);
864 SDOperand Chain = Result.getValue(1);
866 if (RelocM == Reloc::PIC_) {
867 SDOperand PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
868 Result = DAG.getNode(ARMISD::PIC_ADD, PtrVT, Result, PICLabel);
871 Result = DAG.getLoad(PtrVT, Chain, Result, NULL, 0);
876 SDOperand ARMTargetLowering::LowerGLOBAL_OFFSET_TABLE(SDOperand Op,
878 assert(Subtarget->isTargetELF() &&
879 "GLOBAL OFFSET TABLE not implemented for non-ELF targets");
880 MVT::ValueType PtrVT = getPointerTy();
881 unsigned PCAdj = Subtarget->isThumb() ? 4 : 8;
882 ARMConstantPoolValue *CPV = new ARMConstantPoolValue("_GLOBAL_OFFSET_TABLE_",
884 ARMCP::CPValue, PCAdj);
885 SDOperand CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 2);
886 CPAddr = DAG.getNode(ARMISD::Wrapper, MVT::i32, CPAddr);
887 SDOperand Result = DAG.getLoad(PtrVT, DAG.getEntryNode(), CPAddr, NULL, 0);
888 SDOperand PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
889 return DAG.getNode(ARMISD::PIC_ADD, PtrVT, Result, PICLabel);
892 static SDOperand LowerINTRINSIC_WO_CHAIN(SDOperand Op, SelectionDAG &DAG) {
893 MVT::ValueType PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
894 unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getValue();
896 default: return SDOperand(); // Don't custom lower most intrinsics.
897 case Intrinsic::arm_thread_pointer:
898 return DAG.getNode(ARMISD::THREAD_POINTER, PtrVT);
902 static SDOperand LowerVASTART(SDOperand Op, SelectionDAG &DAG,
903 unsigned VarArgsFrameIndex) {
904 // vastart just stores the address of the VarArgsFrameIndex slot into the
905 // memory location argument.
906 MVT::ValueType PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
907 SDOperand FR = DAG.getFrameIndex(VarArgsFrameIndex, PtrVT);
908 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
909 return DAG.getStore(Op.getOperand(0), FR, Op.getOperand(1), SV, 0);
912 static SDOperand LowerFORMAL_ARGUMENT(SDOperand Op, SelectionDAG &DAG,
913 unsigned ArgNo, unsigned &NumGPRs,
914 unsigned &ArgOffset) {
915 MachineFunction &MF = DAG.getMachineFunction();
916 MVT::ValueType ObjectVT = Op.getValue(ArgNo).getValueType();
917 SDOperand Root = Op.getOperand(0);
918 std::vector<SDOperand> ArgValues;
919 MachineRegisterInfo &RegInfo = MF.getRegInfo();
921 static const unsigned GPRArgRegs[] = {
922 ARM::R0, ARM::R1, ARM::R2, ARM::R3
929 unsigned Flags = Op.getConstantOperandVal(ArgNo + 3);
930 HowToPassArgument(ObjectVT, NumGPRs, ArgOffset, ObjGPRs,
931 ObjSize, GPRPad, StackPad, Flags);
933 ArgOffset += StackPad;
937 unsigned VReg = RegInfo.createVirtualRegister(&ARM::GPRRegClass);
938 RegInfo.addLiveIn(GPRArgRegs[NumGPRs], VReg);
939 ArgValue = DAG.getCopyFromReg(Root, VReg, MVT::i32);
940 if (ObjectVT == MVT::f32)
941 ArgValue = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, ArgValue);
942 } else if (ObjGPRs == 2) {
943 unsigned VReg = RegInfo.createVirtualRegister(&ARM::GPRRegClass);
944 RegInfo.addLiveIn(GPRArgRegs[NumGPRs], VReg);
945 ArgValue = DAG.getCopyFromReg(Root, VReg, MVT::i32);
947 VReg = RegInfo.createVirtualRegister(&ARM::GPRRegClass);
948 RegInfo.addLiveIn(GPRArgRegs[NumGPRs+1], VReg);
949 SDOperand ArgValue2 = DAG.getCopyFromReg(Root, VReg, MVT::i32);
951 assert(ObjectVT != MVT::i64 && "i64 should already be lowered");
952 ArgValue = DAG.getNode(ARMISD::FMDRR, MVT::f64, ArgValue, ArgValue2);
957 // If the argument is actually used, emit a load from the right stack
959 if (!Op.Val->hasNUsesOfValue(0, ArgNo)) {
960 MachineFrameInfo *MFI = MF.getFrameInfo();
961 int FI = MFI->CreateFixedObject(ObjSize, ArgOffset);
962 SDOperand FIN = DAG.getFrameIndex(FI, MVT::i32);
964 ArgValue = DAG.getLoad(ObjectVT, Root, FIN, NULL, 0);
966 SDOperand ArgValue2 = DAG.getLoad(MVT::i32, Root, FIN, NULL, 0);
967 assert(ObjectVT != MVT::i64 && "i64 should already be lowered");
968 ArgValue = DAG.getNode(ARMISD::FMDRR, MVT::f64, ArgValue, ArgValue2);
971 // Don't emit a dead load.
972 ArgValue = DAG.getNode(ISD::UNDEF, ObjectVT);
975 ArgOffset += ObjSize; // Move on to the next argument.
982 ARMTargetLowering::LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG) {
983 std::vector<SDOperand> ArgValues;
984 SDOperand Root = Op.getOperand(0);
985 unsigned ArgOffset = 0; // Frame mechanisms handle retaddr slot
986 unsigned NumGPRs = 0; // GPRs used for parameter passing.
988 unsigned NumArgs = Op.Val->getNumValues()-1;
989 for (unsigned ArgNo = 0; ArgNo < NumArgs; ++ArgNo)
990 ArgValues.push_back(LowerFORMAL_ARGUMENT(Op, DAG, ArgNo,
991 NumGPRs, ArgOffset));
993 bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getValue() != 0;
995 static const unsigned GPRArgRegs[] = {
996 ARM::R0, ARM::R1, ARM::R2, ARM::R3
999 MachineFunction &MF = DAG.getMachineFunction();
1000 MachineRegisterInfo &RegInfo = MF.getRegInfo();
1001 MachineFrameInfo *MFI = MF.getFrameInfo();
1002 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1003 unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
1004 unsigned VARegSize = (4 - NumGPRs) * 4;
1005 unsigned VARegSaveSize = (VARegSize + Align - 1) & ~(Align - 1);
1006 if (VARegSaveSize) {
1007 // If this function is vararg, store any remaining integer argument regs
1008 // to their spots on the stack so that they may be loaded by deferencing
1009 // the result of va_next.
1010 AFI->setVarArgsRegSaveSize(VARegSaveSize);
1011 VarArgsFrameIndex = MFI->CreateFixedObject(VARegSaveSize, ArgOffset +
1012 VARegSaveSize - VARegSize);
1013 SDOperand FIN = DAG.getFrameIndex(VarArgsFrameIndex, getPointerTy());
1015 SmallVector<SDOperand, 4> MemOps;
1016 for (; NumGPRs < 4; ++NumGPRs) {
1017 unsigned VReg = RegInfo.createVirtualRegister(&ARM::GPRRegClass);
1018 RegInfo.addLiveIn(GPRArgRegs[NumGPRs], VReg);
1019 SDOperand Val = DAG.getCopyFromReg(Root, VReg, MVT::i32);
1020 SDOperand Store = DAG.getStore(Val.getValue(1), Val, FIN, NULL, 0);
1021 MemOps.push_back(Store);
1022 FIN = DAG.getNode(ISD::ADD, getPointerTy(), FIN,
1023 DAG.getConstant(4, getPointerTy()));
1025 if (!MemOps.empty())
1026 Root = DAG.getNode(ISD::TokenFactor, MVT::Other,
1027 &MemOps[0], MemOps.size());
1029 // This will point to the next argument passed via stack.
1030 VarArgsFrameIndex = MFI->CreateFixedObject(4, ArgOffset);
1033 ArgValues.push_back(Root);
1035 // Return the new list of results.
1036 std::vector<MVT::ValueType> RetVT(Op.Val->value_begin(),
1037 Op.Val->value_end());
1038 return DAG.getNode(ISD::MERGE_VALUES, RetVT, &ArgValues[0], ArgValues.size());
1041 /// isFloatingPointZero - Return true if this is +0.0.
1042 static bool isFloatingPointZero(SDOperand Op) {
1043 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(Op))
1044 return CFP->getValueAPF().isPosZero();
1045 else if (ISD::isEXTLoad(Op.Val) || ISD::isNON_EXTLoad(Op.Val)) {
1046 // Maybe this has already been legalized into the constant pool?
1047 if (Op.getOperand(1).getOpcode() == ARMISD::Wrapper) {
1048 SDOperand WrapperOp = Op.getOperand(1).getOperand(0);
1049 if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(WrapperOp))
1050 if (ConstantFP *CFP = dyn_cast<ConstantFP>(CP->getConstVal()))
1051 return CFP->getValueAPF().isPosZero();
1057 static bool isLegalCmpImmediate(unsigned C, bool isThumb) {
1058 return ( isThumb && (C & ~255U) == 0) ||
1059 (!isThumb && ARM_AM::getSOImmVal(C) != -1);
1062 /// Returns appropriate ARM CMP (cmp) and corresponding condition code for
1063 /// the given operands.
1064 static SDOperand getARMCmp(SDOperand LHS, SDOperand RHS, ISD::CondCode CC,
1065 SDOperand &ARMCC, SelectionDAG &DAG, bool isThumb) {
1066 if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(RHS.Val)) {
1067 unsigned C = RHSC->getValue();
1068 if (!isLegalCmpImmediate(C, isThumb)) {
1069 // Constant does not fit, try adjusting it by one?
1074 if (isLegalCmpImmediate(C-1, isThumb)) {
1075 CC = (CC == ISD::SETLT) ? ISD::SETLE : ISD::SETGT;
1076 RHS = DAG.getConstant(C-1, MVT::i32);
1081 if (C > 0 && isLegalCmpImmediate(C-1, isThumb)) {
1082 CC = (CC == ISD::SETULT) ? ISD::SETULE : ISD::SETUGT;
1083 RHS = DAG.getConstant(C-1, MVT::i32);
1088 if (isLegalCmpImmediate(C+1, isThumb)) {
1089 CC = (CC == ISD::SETLE) ? ISD::SETLT : ISD::SETGE;
1090 RHS = DAG.getConstant(C+1, MVT::i32);
1095 if (C < 0xffffffff && isLegalCmpImmediate(C+1, isThumb)) {
1096 CC = (CC == ISD::SETULE) ? ISD::SETULT : ISD::SETUGE;
1097 RHS = DAG.getConstant(C+1, MVT::i32);
1104 ARMCC::CondCodes CondCode = IntCCToARMCC(CC);
1105 ARMISD::NodeType CompareType;
1108 CompareType = ARMISD::CMP;
1114 // Uses only N and Z Flags
1115 CompareType = ARMISD::CMPNZ;
1118 ARMCC = DAG.getConstant(CondCode, MVT::i32);
1119 return DAG.getNode(CompareType, MVT::Flag, LHS, RHS);
1122 /// Returns a appropriate VFP CMP (fcmp{s|d}+fmstat) for the given operands.
1123 static SDOperand getVFPCmp(SDOperand LHS, SDOperand RHS, SelectionDAG &DAG) {
1125 if (!isFloatingPointZero(RHS))
1126 Cmp = DAG.getNode(ARMISD::CMPFP, MVT::Flag, LHS, RHS);
1128 Cmp = DAG.getNode(ARMISD::CMPFPw0, MVT::Flag, LHS);
1129 return DAG.getNode(ARMISD::FMSTAT, MVT::Flag, Cmp);
1132 static SDOperand LowerSELECT_CC(SDOperand Op, SelectionDAG &DAG,
1133 const ARMSubtarget *ST) {
1134 MVT::ValueType VT = Op.getValueType();
1135 SDOperand LHS = Op.getOperand(0);
1136 SDOperand RHS = Op.getOperand(1);
1137 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
1138 SDOperand TrueVal = Op.getOperand(2);
1139 SDOperand FalseVal = Op.getOperand(3);
1141 if (LHS.getValueType() == MVT::i32) {
1143 SDOperand CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1144 SDOperand Cmp = getARMCmp(LHS, RHS, CC, ARMCC, DAG, ST->isThumb());
1145 return DAG.getNode(ARMISD::CMOV, VT, FalseVal, TrueVal, ARMCC, CCR, Cmp);
1148 ARMCC::CondCodes CondCode, CondCode2;
1149 if (FPCCToARMCC(CC, CondCode, CondCode2))
1150 std::swap(TrueVal, FalseVal);
1152 SDOperand ARMCC = DAG.getConstant(CondCode, MVT::i32);
1153 SDOperand CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1154 SDOperand Cmp = getVFPCmp(LHS, RHS, DAG);
1155 SDOperand Result = DAG.getNode(ARMISD::CMOV, VT, FalseVal, TrueVal,
1157 if (CondCode2 != ARMCC::AL) {
1158 SDOperand ARMCC2 = DAG.getConstant(CondCode2, MVT::i32);
1159 // FIXME: Needs another CMP because flag can have but one use.
1160 SDOperand Cmp2 = getVFPCmp(LHS, RHS, DAG);
1161 Result = DAG.getNode(ARMISD::CMOV, VT, Result, TrueVal, ARMCC2, CCR, Cmp2);
1166 static SDOperand LowerBR_CC(SDOperand Op, SelectionDAG &DAG,
1167 const ARMSubtarget *ST) {
1168 SDOperand Chain = Op.getOperand(0);
1169 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
1170 SDOperand LHS = Op.getOperand(2);
1171 SDOperand RHS = Op.getOperand(3);
1172 SDOperand Dest = Op.getOperand(4);
1174 if (LHS.getValueType() == MVT::i32) {
1176 SDOperand CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1177 SDOperand Cmp = getARMCmp(LHS, RHS, CC, ARMCC, DAG, ST->isThumb());
1178 return DAG.getNode(ARMISD::BRCOND, MVT::Other, Chain, Dest, ARMCC, CCR,Cmp);
1181 assert(LHS.getValueType() == MVT::f32 || LHS.getValueType() == MVT::f64);
1182 ARMCC::CondCodes CondCode, CondCode2;
1183 if (FPCCToARMCC(CC, CondCode, CondCode2))
1184 // Swap the LHS/RHS of the comparison if needed.
1185 std::swap(LHS, RHS);
1187 SDOperand Cmp = getVFPCmp(LHS, RHS, DAG);
1188 SDOperand ARMCC = DAG.getConstant(CondCode, MVT::i32);
1189 SDOperand CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1190 SDVTList VTList = DAG.getVTList(MVT::Other, MVT::Flag);
1191 SDOperand Ops[] = { Chain, Dest, ARMCC, CCR, Cmp };
1192 SDOperand Res = DAG.getNode(ARMISD::BRCOND, VTList, Ops, 5);
1193 if (CondCode2 != ARMCC::AL) {
1194 ARMCC = DAG.getConstant(CondCode2, MVT::i32);
1195 SDOperand Ops[] = { Res, Dest, ARMCC, CCR, Res.getValue(1) };
1196 Res = DAG.getNode(ARMISD::BRCOND, VTList, Ops, 5);
1201 SDOperand ARMTargetLowering::LowerBR_JT(SDOperand Op, SelectionDAG &DAG) {
1202 SDOperand Chain = Op.getOperand(0);
1203 SDOperand Table = Op.getOperand(1);
1204 SDOperand Index = Op.getOperand(2);
1206 MVT::ValueType PTy = getPointerTy();
1207 JumpTableSDNode *JT = cast<JumpTableSDNode>(Table);
1208 ARMFunctionInfo *AFI = DAG.getMachineFunction().getInfo<ARMFunctionInfo>();
1209 SDOperand UId = DAG.getConstant(AFI->createJumpTableUId(), PTy);
1210 SDOperand JTI = DAG.getTargetJumpTable(JT->getIndex(), PTy);
1211 Table = DAG.getNode(ARMISD::WrapperJT, MVT::i32, JTI, UId);
1212 Index = DAG.getNode(ISD::MUL, PTy, Index, DAG.getConstant(4, PTy));
1213 SDOperand Addr = DAG.getNode(ISD::ADD, PTy, Index, Table);
1214 bool isPIC = getTargetMachine().getRelocationModel() == Reloc::PIC_;
1215 Addr = DAG.getLoad(isPIC ? (MVT::ValueType)MVT::i32 : PTy,
1216 Chain, Addr, NULL, 0);
1217 Chain = Addr.getValue(1);
1219 Addr = DAG.getNode(ISD::ADD, PTy, Addr, Table);
1220 return DAG.getNode(ARMISD::BR_JT, MVT::Other, Chain, Addr, JTI, UId);
1223 static SDOperand LowerFP_TO_INT(SDOperand Op, SelectionDAG &DAG) {
1225 Op.getOpcode() == ISD::FP_TO_SINT ? ARMISD::FTOSI : ARMISD::FTOUI;
1226 Op = DAG.getNode(Opc, MVT::f32, Op.getOperand(0));
1227 return DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Op);
1230 static SDOperand LowerINT_TO_FP(SDOperand Op, SelectionDAG &DAG) {
1231 MVT::ValueType VT = Op.getValueType();
1233 Op.getOpcode() == ISD::SINT_TO_FP ? ARMISD::SITOF : ARMISD::UITOF;
1235 Op = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, Op.getOperand(0));
1236 return DAG.getNode(Opc, VT, Op);
1239 static SDOperand LowerFCOPYSIGN(SDOperand Op, SelectionDAG &DAG) {
1240 // Implement fcopysign with a fabs and a conditional fneg.
1241 SDOperand Tmp0 = Op.getOperand(0);
1242 SDOperand Tmp1 = Op.getOperand(1);
1243 MVT::ValueType VT = Op.getValueType();
1244 MVT::ValueType SrcVT = Tmp1.getValueType();
1245 SDOperand AbsVal = DAG.getNode(ISD::FABS, VT, Tmp0);
1246 SDOperand Cmp = getVFPCmp(Tmp1, DAG.getConstantFP(0.0, SrcVT), DAG);
1247 SDOperand ARMCC = DAG.getConstant(ARMCC::LT, MVT::i32);
1248 SDOperand CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1249 return DAG.getNode(ARMISD::CNEG, VT, AbsVal, AbsVal, ARMCC, CCR, Cmp);
1252 SDOperand ARMTargetLowering::LowerMEMCPYInline(SDOperand Chain,
1257 SelectionDAG &DAG) {
1258 // Do repeated 4-byte loads and stores. To be improved.
1259 assert((Align & 3) == 0 && "Expected 4-byte aligned addresses!");
1260 unsigned BytesLeft = Size & 3;
1261 unsigned NumMemOps = Size >> 2;
1262 unsigned EmittedNumMemOps = 0;
1263 unsigned SrcOff = 0, DstOff = 0;
1264 MVT::ValueType VT = MVT::i32;
1265 unsigned VTSize = 4;
1267 const unsigned MAX_LOADS_IN_LDM = 6;
1268 SDOperand TFOps[MAX_LOADS_IN_LDM];
1269 SDOperand Loads[MAX_LOADS_IN_LDM];
1271 // Emit up to MAX_LOADS_IN_LDM loads, then a TokenFactor barrier, then the
1272 // same number of stores. The loads and stores will get combined into
1273 // ldm/stm later on.
1274 while (EmittedNumMemOps < NumMemOps) {
1276 i < MAX_LOADS_IN_LDM && EmittedNumMemOps + i < NumMemOps; ++i) {
1277 Loads[i] = DAG.getLoad(VT, Chain,
1278 DAG.getNode(ISD::ADD, MVT::i32, Source,
1279 DAG.getConstant(SrcOff, MVT::i32)),
1281 TFOps[i] = Loads[i].getValue(1);
1284 Chain = DAG.getNode(ISD::TokenFactor, MVT::Other, &TFOps[0], i);
1287 i < MAX_LOADS_IN_LDM && EmittedNumMemOps + i < NumMemOps; ++i) {
1288 TFOps[i] = DAG.getStore(Chain, Loads[i],
1289 DAG.getNode(ISD::ADD, MVT::i32, Dest,
1290 DAG.getConstant(DstOff, MVT::i32)),
1294 Chain = DAG.getNode(ISD::TokenFactor, MVT::Other, &TFOps[0], i);
1296 EmittedNumMemOps += i;
1302 // Issue loads / stores for the trailing (1 - 3) bytes.
1303 unsigned BytesLeftSave = BytesLeft;
1306 if (BytesLeft >= 2) {
1314 Loads[i] = DAG.getLoad(VT, Chain,
1315 DAG.getNode(ISD::ADD, MVT::i32, Source,
1316 DAG.getConstant(SrcOff, MVT::i32)),
1318 TFOps[i] = Loads[i].getValue(1);
1321 BytesLeft -= VTSize;
1323 Chain = DAG.getNode(ISD::TokenFactor, MVT::Other, &TFOps[0], i);
1326 BytesLeft = BytesLeftSave;
1328 if (BytesLeft >= 2) {
1336 TFOps[i] = DAG.getStore(Chain, Loads[i],
1337 DAG.getNode(ISD::ADD, MVT::i32, Dest,
1338 DAG.getConstant(DstOff, MVT::i32)),
1342 BytesLeft -= VTSize;
1344 return DAG.getNode(ISD::TokenFactor, MVT::Other, &TFOps[0], i);
1347 static SDNode *ExpandBIT_CONVERT(SDNode *N, SelectionDAG &DAG) {
1348 // Turn f64->i64 into FMRRD.
1349 assert(N->getValueType(0) == MVT::i64 &&
1350 N->getOperand(0).getValueType() == MVT::f64);
1352 SDOperand Op = N->getOperand(0);
1353 SDOperand Cvt = DAG.getNode(ARMISD::FMRRD, DAG.getVTList(MVT::i32, MVT::i32),
1356 // Merge the pieces into a single i64 value.
1357 return DAG.getNode(ISD::BUILD_PAIR, MVT::i64, Cvt, Cvt.getValue(1)).Val;
1360 static SDNode *ExpandSRx(SDNode *N, SelectionDAG &DAG, const ARMSubtarget *ST) {
1361 assert(N->getValueType(0) == MVT::i64 &&
1362 (N->getOpcode() == ISD::SRL || N->getOpcode() == ISD::SRA) &&
1363 "Unknown shift to lower!");
1365 // We only lower SRA, SRL of 1 here, all others use generic lowering.
1366 if (!isa<ConstantSDNode>(N->getOperand(1)) ||
1367 cast<ConstantSDNode>(N->getOperand(1))->getValue() != 1)
1370 // If we are in thumb mode, we don't have RRX.
1371 if (ST->isThumb()) return 0;
1373 // Okay, we have a 64-bit SRA or SRL of 1. Lower this to an RRX expr.
1374 SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, N->getOperand(0),
1375 DAG.getConstant(0, MVT::i32));
1376 SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, N->getOperand(0),
1377 DAG.getConstant(1, MVT::i32));
1379 // First, build a SRA_FLAG/SRL_FLAG op, which shifts the top part by one and
1380 // captures the result into a carry flag.
1381 unsigned Opc = N->getOpcode() == ISD::SRL ? ARMISD::SRL_FLAG:ARMISD::SRA_FLAG;
1382 Hi = DAG.getNode(Opc, DAG.getVTList(MVT::i32, MVT::Flag), &Hi, 1);
1384 // The low part is an ARMISD::RRX operand, which shifts the carry in.
1385 Lo = DAG.getNode(ARMISD::RRX, MVT::i32, Lo, Hi.getValue(1));
1387 // Merge the pieces into a single i64 value.
1388 return DAG.getNode(ISD::BUILD_PAIR, MVT::i64, Lo, Hi).Val;
1392 SDOperand ARMTargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
1393 switch (Op.getOpcode()) {
1394 default: assert(0 && "Don't know how to custom lower this!"); abort();
1395 case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
1396 case ISD::GlobalAddress:
1397 return Subtarget->isTargetDarwin() ? LowerGlobalAddressDarwin(Op, DAG) :
1398 LowerGlobalAddressELF(Op, DAG);
1399 case ISD::GlobalTLSAddress: return LowerGlobalTLSAddress(Op, DAG);
1400 case ISD::CALL: return LowerCALL(Op, DAG);
1401 case ISD::RET: return LowerRET(Op, DAG);
1402 case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG, Subtarget);
1403 case ISD::BR_CC: return LowerBR_CC(Op, DAG, Subtarget);
1404 case ISD::BR_JT: return LowerBR_JT(Op, DAG);
1405 case ISD::VASTART: return LowerVASTART(Op, DAG, VarArgsFrameIndex);
1406 case ISD::SINT_TO_FP:
1407 case ISD::UINT_TO_FP: return LowerINT_TO_FP(Op, DAG);
1408 case ISD::FP_TO_SINT:
1409 case ISD::FP_TO_UINT: return LowerFP_TO_INT(Op, DAG);
1410 case ISD::FCOPYSIGN: return LowerFCOPYSIGN(Op, DAG);
1411 case ISD::FORMAL_ARGUMENTS: return LowerFORMAL_ARGUMENTS(Op, DAG);
1412 case ISD::RETURNADDR: break;
1413 case ISD::FRAMEADDR: break;
1414 case ISD::GLOBAL_OFFSET_TABLE: return LowerGLOBAL_OFFSET_TABLE(Op, DAG);
1415 case ISD::MEMCPY: return LowerMEMCPY(Op, DAG);
1416 case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG);
1419 // FIXME: Remove these when LegalizeDAGTypes lands.
1420 case ISD::BIT_CONVERT: return SDOperand(ExpandBIT_CONVERT(Op.Val, DAG), 0);
1422 case ISD::SRA: return SDOperand(ExpandSRx(Op.Val, DAG,Subtarget),0);
1428 /// ExpandOperationResult - Provide custom lowering hooks for expanding
1430 SDNode *ARMTargetLowering::ExpandOperationResult(SDNode *N, SelectionDAG &DAG) {
1431 switch (N->getOpcode()) {
1432 default: assert(0 && "Don't know how to custom expand this!"); abort();
1433 case ISD::BIT_CONVERT: return ExpandBIT_CONVERT(N, DAG);
1435 case ISD::SRA: return ExpandSRx(N, DAG, Subtarget);
1440 //===----------------------------------------------------------------------===//
1441 // ARM Scheduler Hooks
1442 //===----------------------------------------------------------------------===//
1445 ARMTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
1446 MachineBasicBlock *BB) {
1447 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
1448 switch (MI->getOpcode()) {
1449 default: assert(false && "Unexpected instr type to insert");
1450 case ARM::tMOVCCr: {
1451 // To "insert" a SELECT_CC instruction, we actually have to insert the
1452 // diamond control-flow pattern. The incoming instruction knows the
1453 // destination vreg to set, the condition code register to branch on, the
1454 // true/false values to select between, and a branch opcode to use.
1455 const BasicBlock *LLVM_BB = BB->getBasicBlock();
1456 ilist<MachineBasicBlock>::iterator It = BB;
1462 // cmpTY ccX, r1, r2
1464 // fallthrough --> copy0MBB
1465 MachineBasicBlock *thisMBB = BB;
1466 MachineBasicBlock *copy0MBB = new MachineBasicBlock(LLVM_BB);
1467 MachineBasicBlock *sinkMBB = new MachineBasicBlock(LLVM_BB);
1468 BuildMI(BB, TII->get(ARM::tBcc)).addMBB(sinkMBB)
1469 .addImm(MI->getOperand(3).getImm()).addReg(MI->getOperand(4).getReg());
1470 MachineFunction *F = BB->getParent();
1471 F->getBasicBlockList().insert(It, copy0MBB);
1472 F->getBasicBlockList().insert(It, sinkMBB);
1473 // Update machine-CFG edges by first adding all successors of the current
1474 // block to the new block which will contain the Phi node for the select.
1475 for(MachineBasicBlock::succ_iterator i = BB->succ_begin(),
1476 e = BB->succ_end(); i != e; ++i)
1477 sinkMBB->addSuccessor(*i);
1478 // Next, remove all successors of the current block, and add the true
1479 // and fallthrough blocks as its successors.
1480 while(!BB->succ_empty())
1481 BB->removeSuccessor(BB->succ_begin());
1482 BB->addSuccessor(copy0MBB);
1483 BB->addSuccessor(sinkMBB);
1486 // %FalseValue = ...
1487 // # fallthrough to sinkMBB
1490 // Update machine-CFG edges
1491 BB->addSuccessor(sinkMBB);
1494 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
1497 BuildMI(BB, TII->get(ARM::PHI), MI->getOperand(0).getReg())
1498 .addReg(MI->getOperand(1).getReg()).addMBB(copy0MBB)
1499 .addReg(MI->getOperand(2).getReg()).addMBB(thisMBB);
1501 delete MI; // The pseudo instruction is gone now.
1507 //===----------------------------------------------------------------------===//
1508 // ARM Optimization Hooks
1509 //===----------------------------------------------------------------------===//
1511 /// PerformFMRRDCombine - Target-specific dag combine xforms for ARMISD::FMRRD.
1512 static SDOperand PerformFMRRDCombine(SDNode *N,
1513 TargetLowering::DAGCombinerInfo &DCI) {
1514 // fmrrd(fmdrr x, y) -> x,y
1515 SDOperand InDouble = N->getOperand(0);
1516 if (InDouble.getOpcode() == ARMISD::FMDRR)
1517 return DCI.CombineTo(N, InDouble.getOperand(0), InDouble.getOperand(1));
1521 SDOperand ARMTargetLowering::PerformDAGCombine(SDNode *N,
1522 DAGCombinerInfo &DCI) const {
1523 switch (N->getOpcode()) {
1525 case ARMISD::FMRRD: return PerformFMRRDCombine(N, DCI);
1532 /// isLegalAddressImmediate - Return true if the integer value can be used
1533 /// as the offset of the target addressing mode for load / store of the
1535 static bool isLegalAddressImmediate(int64_t V, MVT::ValueType VT,
1536 const ARMSubtarget *Subtarget) {
1540 if (Subtarget->isThumb()) {
1546 default: return false;
1561 if ((V & (Scale - 1)) != 0)
1564 return V == V & ((1LL << 5) - 1);
1570 default: return false;
1575 return V == V & ((1LL << 12) - 1);
1578 return V == V & ((1LL << 8) - 1);
1581 if (!Subtarget->hasVFP2())
1586 return V == V & ((1LL << 8) - 1);
1590 /// isLegalAddressingMode - Return true if the addressing mode represented
1591 /// by AM is legal for this target, for a load/store of the specified type.
1592 bool ARMTargetLowering::isLegalAddressingMode(const AddrMode &AM,
1593 const Type *Ty) const {
1594 if (!isLegalAddressImmediate(AM.BaseOffs, getValueType(Ty), Subtarget))
1597 // Can never fold addr of global into load/store.
1602 case 0: // no scale reg, must be "r+i" or "r", or "i".
1605 if (Subtarget->isThumb())
1609 // ARM doesn't support any R+R*scale+imm addr modes.
1613 int Scale = AM.Scale;
1614 switch (getValueType(Ty)) {
1615 default: return false;
1620 // This assumes i64 is legalized to a pair of i32. If not (i.e.
1621 // ldrd / strd are used, then its address mode is same as i16.
1623 if (Scale < 0) Scale = -Scale;
1627 return isPowerOf2_32(Scale & ~1);
1630 if (((unsigned)AM.HasBaseReg + Scale) <= 2)
1635 // Note, we allow "void" uses (basically, uses that aren't loads or
1636 // stores), because arm allows folding a scale into many arithmetic
1637 // operations. This should be made more precise and revisited later.
1639 // Allow r << imm, but the imm has to be a multiple of two.
1640 if (AM.Scale & 1) return false;
1641 return isPowerOf2_32(AM.Scale);
1649 static bool getIndexedAddressParts(SDNode *Ptr, MVT::ValueType VT,
1650 bool isSEXTLoad, SDOperand &Base,
1651 SDOperand &Offset, bool &isInc,
1652 SelectionDAG &DAG) {
1653 if (Ptr->getOpcode() != ISD::ADD && Ptr->getOpcode() != ISD::SUB)
1656 if (VT == MVT::i16 || ((VT == MVT::i8 || VT == MVT::i1) && isSEXTLoad)) {
1658 Base = Ptr->getOperand(0);
1659 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) {
1660 int RHSC = (int)RHS->getValue();
1661 if (RHSC < 0 && RHSC > -256) {
1663 Offset = DAG.getConstant(-RHSC, RHS->getValueType(0));
1667 isInc = (Ptr->getOpcode() == ISD::ADD);
1668 Offset = Ptr->getOperand(1);
1670 } else if (VT == MVT::i32 || VT == MVT::i8 || VT == MVT::i1) {
1672 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) {
1673 int RHSC = (int)RHS->getValue();
1674 if (RHSC < 0 && RHSC > -0x1000) {
1676 Offset = DAG.getConstant(-RHSC, RHS->getValueType(0));
1677 Base = Ptr->getOperand(0);
1682 if (Ptr->getOpcode() == ISD::ADD) {
1684 ARM_AM::ShiftOpc ShOpcVal= ARM_AM::getShiftOpcForNode(Ptr->getOperand(0));
1685 if (ShOpcVal != ARM_AM::no_shift) {
1686 Base = Ptr->getOperand(1);
1687 Offset = Ptr->getOperand(0);
1689 Base = Ptr->getOperand(0);
1690 Offset = Ptr->getOperand(1);
1695 isInc = (Ptr->getOpcode() == ISD::ADD);
1696 Base = Ptr->getOperand(0);
1697 Offset = Ptr->getOperand(1);
1701 // FIXME: Use FLDM / FSTM to emulate indexed FP load / store.
1705 /// getPreIndexedAddressParts - returns true by value, base pointer and
1706 /// offset pointer and addressing mode by reference if the node's address
1707 /// can be legally represented as pre-indexed load / store address.
1709 ARMTargetLowering::getPreIndexedAddressParts(SDNode *N, SDOperand &Base,
1711 ISD::MemIndexedMode &AM,
1712 SelectionDAG &DAG) {
1713 if (Subtarget->isThumb())
1718 bool isSEXTLoad = false;
1719 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
1720 Ptr = LD->getBasePtr();
1721 VT = LD->getMemoryVT();
1722 isSEXTLoad = LD->getExtensionType() == ISD::SEXTLOAD;
1723 } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
1724 Ptr = ST->getBasePtr();
1725 VT = ST->getMemoryVT();
1730 bool isLegal = getIndexedAddressParts(Ptr.Val, VT, isSEXTLoad, Base, Offset,
1733 AM = isInc ? ISD::PRE_INC : ISD::PRE_DEC;
1739 /// getPostIndexedAddressParts - returns true by value, base pointer and
1740 /// offset pointer and addressing mode by reference if this node can be
1741 /// combined with a load / store to form a post-indexed load / store.
1742 bool ARMTargetLowering::getPostIndexedAddressParts(SDNode *N, SDNode *Op,
1745 ISD::MemIndexedMode &AM,
1746 SelectionDAG &DAG) {
1747 if (Subtarget->isThumb())
1752 bool isSEXTLoad = false;
1753 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
1754 VT = LD->getMemoryVT();
1755 isSEXTLoad = LD->getExtensionType() == ISD::SEXTLOAD;
1756 } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
1757 VT = ST->getMemoryVT();
1762 bool isLegal = getIndexedAddressParts(Op, VT, isSEXTLoad, Base, Offset,
1765 AM = isInc ? ISD::POST_INC : ISD::POST_DEC;
1771 void ARMTargetLowering::computeMaskedBitsForTargetNode(const SDOperand Op,
1773 uint64_t &KnownZero,
1775 const SelectionDAG &DAG,
1776 unsigned Depth) const {
1779 switch (Op.getOpcode()) {
1781 case ARMISD::CMOV: {
1782 // Bits are known zero/one if known on the LHS and RHS.
1783 DAG.ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero, KnownOne, Depth+1);
1784 if (KnownZero == 0 && KnownOne == 0) return;
1786 uint64_t KnownZeroRHS, KnownOneRHS;
1787 DAG.ComputeMaskedBits(Op.getOperand(1), Mask,
1788 KnownZeroRHS, KnownOneRHS, Depth+1);
1789 KnownZero &= KnownZeroRHS;
1790 KnownOne &= KnownOneRHS;
1796 //===----------------------------------------------------------------------===//
1797 // ARM Inline Assembly Support
1798 //===----------------------------------------------------------------------===//
1800 /// getConstraintType - Given a constraint letter, return the type of
1801 /// constraint it is for this target.
1802 ARMTargetLowering::ConstraintType
1803 ARMTargetLowering::getConstraintType(const std::string &Constraint) const {
1804 if (Constraint.size() == 1) {
1805 switch (Constraint[0]) {
1807 case 'l': return C_RegisterClass;
1808 case 'w': return C_RegisterClass;
1811 return TargetLowering::getConstraintType(Constraint);
1814 std::pair<unsigned, const TargetRegisterClass*>
1815 ARMTargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint,
1816 MVT::ValueType VT) const {
1817 if (Constraint.size() == 1) {
1818 // GCC RS6000 Constraint Letters
1819 switch (Constraint[0]) {
1821 // FIXME: in thumb mode, 'l' is only low-regs.
1824 return std::make_pair(0U, ARM::GPRRegisterClass);
1827 return std::make_pair(0U, ARM::SPRRegisterClass);
1829 return std::make_pair(0U, ARM::DPRRegisterClass);
1833 return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
1836 std::vector<unsigned> ARMTargetLowering::
1837 getRegClassForInlineAsmConstraint(const std::string &Constraint,
1838 MVT::ValueType VT) const {
1839 if (Constraint.size() != 1)
1840 return std::vector<unsigned>();
1842 switch (Constraint[0]) { // GCC ARM Constraint Letters
1846 return make_vector<unsigned>(ARM::R0, ARM::R1, ARM::R2, ARM::R3,
1847 ARM::R4, ARM::R5, ARM::R6, ARM::R7,
1848 ARM::R8, ARM::R9, ARM::R10, ARM::R11,
1849 ARM::R12, ARM::LR, 0);
1852 return make_vector<unsigned>(ARM::S0, ARM::S1, ARM::S2, ARM::S3,
1853 ARM::S4, ARM::S5, ARM::S6, ARM::S7,
1854 ARM::S8, ARM::S9, ARM::S10, ARM::S11,
1855 ARM::S12,ARM::S13,ARM::S14,ARM::S15,
1856 ARM::S16,ARM::S17,ARM::S18,ARM::S19,
1857 ARM::S20,ARM::S21,ARM::S22,ARM::S23,
1858 ARM::S24,ARM::S25,ARM::S26,ARM::S27,
1859 ARM::S28,ARM::S29,ARM::S30,ARM::S31, 0);
1861 return make_vector<unsigned>(ARM::D0, ARM::D1, ARM::D2, ARM::D3,
1862 ARM::D4, ARM::D5, ARM::D6, ARM::D7,
1863 ARM::D8, ARM::D9, ARM::D10,ARM::D11,
1864 ARM::D12,ARM::D13,ARM::D14,ARM::D15, 0);
1868 return std::vector<unsigned>();