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::DBG_STOPPOINT, 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 // Use the default implementation.
201 setOperationAction(ISD::VASTART , MVT::Other, Custom);
202 setOperationAction(ISD::VAARG , MVT::Other, Expand);
203 setOperationAction(ISD::VACOPY , MVT::Other, Expand);
204 setOperationAction(ISD::VAEND , MVT::Other, Expand);
205 setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
206 setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
207 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32 , Expand);
208 setOperationAction(ISD::MEMBARRIER , MVT::Other, Expand);
210 if (!Subtarget->hasV6Ops()) {
211 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16, Expand);
212 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8, Expand);
214 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
216 if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb())
217 // Turn f64->i64 into FMRRD iff target supports vfp2.
218 setOperationAction(ISD::BIT_CONVERT, MVT::i64, Custom);
220 // We want to custom lower some of our intrinsics.
221 setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
223 setOperationAction(ISD::SETCC , MVT::i32, Expand);
224 setOperationAction(ISD::SETCC , MVT::f32, Expand);
225 setOperationAction(ISD::SETCC , MVT::f64, Expand);
226 setOperationAction(ISD::SELECT , MVT::i32, Expand);
227 setOperationAction(ISD::SELECT , MVT::f32, Expand);
228 setOperationAction(ISD::SELECT , MVT::f64, Expand);
229 setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
230 setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
231 setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
233 setOperationAction(ISD::BRCOND , MVT::Other, Expand);
234 setOperationAction(ISD::BR_CC , MVT::i32, Custom);
235 setOperationAction(ISD::BR_CC , MVT::f32, Custom);
236 setOperationAction(ISD::BR_CC , MVT::f64, Custom);
237 setOperationAction(ISD::BR_JT , MVT::Other, Custom);
239 // We don't support sin/cos/fmod/copysign/pow
240 setOperationAction(ISD::FSIN , MVT::f64, Expand);
241 setOperationAction(ISD::FSIN , MVT::f32, Expand);
242 setOperationAction(ISD::FCOS , MVT::f32, Expand);
243 setOperationAction(ISD::FCOS , MVT::f64, Expand);
244 setOperationAction(ISD::FREM , MVT::f64, Expand);
245 setOperationAction(ISD::FREM , MVT::f32, Expand);
246 if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb()) {
247 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Custom);
248 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Custom);
250 setOperationAction(ISD::FPOW , MVT::f64, Expand);
251 setOperationAction(ISD::FPOW , MVT::f32, Expand);
253 // int <-> fp are custom expanded into bit_convert + ARMISD ops.
254 if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb()) {
255 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
256 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Custom);
257 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Custom);
258 setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
261 // We have target-specific dag combine patterns for the following nodes:
262 // ARMISD::FMRRD - No need to call setTargetDAGCombine
264 setStackPointerRegisterToSaveRestore(ARM::SP);
265 setSchedulingPreference(SchedulingForRegPressure);
266 setIfCvtBlockSizeLimit(Subtarget->isThumb() ? 0 : 10);
267 setIfCvtDupBlockSizeLimit(Subtarget->isThumb() ? 0 : 2);
269 maxStoresPerMemcpy = 1; //// temporary - rewrite interface to use type
273 const char *ARMTargetLowering::getTargetNodeName(unsigned Opcode) const {
276 case ARMISD::Wrapper: return "ARMISD::Wrapper";
277 case ARMISD::WrapperJT: return "ARMISD::WrapperJT";
278 case ARMISD::CALL: return "ARMISD::CALL";
279 case ARMISD::CALL_PRED: return "ARMISD::CALL_PRED";
280 case ARMISD::CALL_NOLINK: return "ARMISD::CALL_NOLINK";
281 case ARMISD::tCALL: return "ARMISD::tCALL";
282 case ARMISD::BRCOND: return "ARMISD::BRCOND";
283 case ARMISD::BR_JT: return "ARMISD::BR_JT";
284 case ARMISD::RET_FLAG: return "ARMISD::RET_FLAG";
285 case ARMISD::PIC_ADD: return "ARMISD::PIC_ADD";
286 case ARMISD::CMP: return "ARMISD::CMP";
287 case ARMISD::CMPNZ: return "ARMISD::CMPNZ";
288 case ARMISD::CMPFP: return "ARMISD::CMPFP";
289 case ARMISD::CMPFPw0: return "ARMISD::CMPFPw0";
290 case ARMISD::FMSTAT: return "ARMISD::FMSTAT";
291 case ARMISD::CMOV: return "ARMISD::CMOV";
292 case ARMISD::CNEG: return "ARMISD::CNEG";
294 case ARMISD::FTOSI: return "ARMISD::FTOSI";
295 case ARMISD::FTOUI: return "ARMISD::FTOUI";
296 case ARMISD::SITOF: return "ARMISD::SITOF";
297 case ARMISD::UITOF: return "ARMISD::UITOF";
299 case ARMISD::SRL_FLAG: return "ARMISD::SRL_FLAG";
300 case ARMISD::SRA_FLAG: return "ARMISD::SRA_FLAG";
301 case ARMISD::RRX: return "ARMISD::RRX";
303 case ARMISD::FMRRD: return "ARMISD::FMRRD";
304 case ARMISD::FMDRR: return "ARMISD::FMDRR";
306 case ARMISD::THREAD_POINTER:return "ARMISD::THREAD_POINTER";
310 //===----------------------------------------------------------------------===//
312 //===----------------------------------------------------------------------===//
315 /// IntCCToARMCC - Convert a DAG integer condition code to an ARM CC
316 static ARMCC::CondCodes IntCCToARMCC(ISD::CondCode CC) {
318 default: assert(0 && "Unknown condition code!");
319 case ISD::SETNE: return ARMCC::NE;
320 case ISD::SETEQ: return ARMCC::EQ;
321 case ISD::SETGT: return ARMCC::GT;
322 case ISD::SETGE: return ARMCC::GE;
323 case ISD::SETLT: return ARMCC::LT;
324 case ISD::SETLE: return ARMCC::LE;
325 case ISD::SETUGT: return ARMCC::HI;
326 case ISD::SETUGE: return ARMCC::HS;
327 case ISD::SETULT: return ARMCC::LO;
328 case ISD::SETULE: return ARMCC::LS;
332 /// FPCCToARMCC - Convert a DAG fp condition code to an ARM CC. It
333 /// returns true if the operands should be inverted to form the proper
335 static bool FPCCToARMCC(ISD::CondCode CC, ARMCC::CondCodes &CondCode,
336 ARMCC::CondCodes &CondCode2) {
338 CondCode2 = ARMCC::AL;
340 default: assert(0 && "Unknown FP condition!");
342 case ISD::SETOEQ: CondCode = ARMCC::EQ; break;
344 case ISD::SETOGT: CondCode = ARMCC::GT; break;
346 case ISD::SETOGE: CondCode = ARMCC::GE; break;
347 case ISD::SETOLT: CondCode = ARMCC::MI; break;
348 case ISD::SETOLE: CondCode = ARMCC::GT; Invert = true; break;
349 case ISD::SETONE: CondCode = ARMCC::MI; CondCode2 = ARMCC::GT; break;
350 case ISD::SETO: CondCode = ARMCC::VC; break;
351 case ISD::SETUO: CondCode = ARMCC::VS; break;
352 case ISD::SETUEQ: CondCode = ARMCC::EQ; CondCode2 = ARMCC::VS; break;
353 case ISD::SETUGT: CondCode = ARMCC::HI; break;
354 case ISD::SETUGE: CondCode = ARMCC::PL; break;
356 case ISD::SETULT: CondCode = ARMCC::LT; break;
358 case ISD::SETULE: CondCode = ARMCC::LE; break;
360 case ISD::SETUNE: CondCode = ARMCC::NE; break;
366 HowToPassArgument(MVT ObjectVT, unsigned NumGPRs,
367 unsigned StackOffset, unsigned &NeededGPRs,
368 unsigned &NeededStackSize, unsigned &GPRPad,
369 unsigned &StackPad, ISD::ArgFlagsTy Flags) {
374 unsigned align = Flags.getOrigAlign();
375 GPRPad = NumGPRs % ((align + 3)/4);
376 StackPad = StackOffset % align;
377 unsigned firstGPR = NumGPRs + GPRPad;
378 switch (ObjectVT.getSimpleVT()) {
379 default: assert(0 && "Unhandled argument type!");
391 else if (firstGPR == 3) {
399 /// LowerCALL - Lowering a ISD::CALL node into a callseq_start <-
400 /// ARMISD:CALL <- callseq_end chain. Also add input and output parameter
402 SDOperand ARMTargetLowering::LowerCALL(SDOperand Op, SelectionDAG &DAG) {
403 MVT RetVT= Op.Val->getValueType(0);
404 SDOperand Chain = Op.getOperand(0);
405 unsigned CallConv = cast<ConstantSDNode>(Op.getOperand(1))->getValue();
406 assert((CallConv == CallingConv::C ||
407 CallConv == CallingConv::Fast) && "unknown calling convention");
408 SDOperand Callee = Op.getOperand(4);
409 unsigned NumOps = (Op.getNumOperands() - 5) / 2;
410 unsigned ArgOffset = 0; // Frame mechanisms handle retaddr slot
411 unsigned NumGPRs = 0; // GPRs used for parameter passing.
413 // Count how many bytes are to be pushed on the stack.
414 unsigned NumBytes = 0;
416 // Add up all the space actually used.
417 for (unsigned i = 0; i < NumOps; ++i) {
422 MVT ObjectVT = Op.getOperand(5+2*i).getValueType();
423 ISD::ArgFlagsTy Flags =
424 cast<ARG_FLAGSSDNode>(Op.getOperand(5+2*i+1))->getArgFlags();
425 HowToPassArgument(ObjectVT, NumGPRs, NumBytes, ObjGPRs, ObjSize,
426 GPRPad, StackPad, Flags);
427 NumBytes += ObjSize + StackPad;
428 NumGPRs += ObjGPRs + GPRPad;
431 // Adjust the stack pointer for the new arguments...
432 // These operations are automatically eliminated by the prolog/epilog pass
433 Chain = DAG.getCALLSEQ_START(Chain,
434 DAG.getConstant(NumBytes, MVT::i32));
436 SDOperand StackPtr = DAG.getRegister(ARM::SP, MVT::i32);
438 static const unsigned GPRArgRegs[] = {
439 ARM::R0, ARM::R1, ARM::R2, ARM::R3
443 std::vector<std::pair<unsigned, SDOperand> > RegsToPass;
444 std::vector<SDOperand> MemOpChains;
445 for (unsigned i = 0; i != NumOps; ++i) {
446 SDOperand Arg = Op.getOperand(5+2*i);
447 ISD::ArgFlagsTy Flags =
448 cast<ARG_FLAGSSDNode>(Op.getOperand(5+2*i+1))->getArgFlags();
449 MVT ArgVT = Arg.getValueType();
455 HowToPassArgument(ArgVT, NumGPRs, ArgOffset, ObjGPRs,
456 ObjSize, GPRPad, StackPad, Flags);
458 ArgOffset += StackPad;
460 switch (ArgVT.getSimpleVT()) {
461 default: assert(0 && "Unexpected ValueType for argument!");
463 RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs], Arg));
466 RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs],
467 DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Arg)));
470 SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Arg,
471 DAG.getConstant(0, getPointerTy()));
472 SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Arg,
473 DAG.getConstant(1, getPointerTy()));
474 RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs], Lo));
476 RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs+1], Hi));
478 SDOperand PtrOff= DAG.getConstant(ArgOffset, StackPtr.getValueType());
479 PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff);
480 MemOpChains.push_back(DAG.getStore(Chain, Hi, PtrOff, NULL, 0));
485 SDOperand Cvt = DAG.getNode(ARMISD::FMRRD,
486 DAG.getVTList(MVT::i32, MVT::i32),
488 RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs], Cvt));
490 RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs+1],
493 SDOperand PtrOff= DAG.getConstant(ArgOffset, StackPtr.getValueType());
494 PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff);
495 MemOpChains.push_back(DAG.getStore(Chain, Cvt.getValue(1), PtrOff,
502 assert(ObjSize != 0);
503 SDOperand PtrOff = DAG.getConstant(ArgOffset, StackPtr.getValueType());
504 PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff);
505 MemOpChains.push_back(DAG.getStore(Chain, Arg, PtrOff, NULL, 0));
509 ArgOffset += ObjSize;
512 if (!MemOpChains.empty())
513 Chain = DAG.getNode(ISD::TokenFactor, MVT::Other,
514 &MemOpChains[0], MemOpChains.size());
516 // Build a sequence of copy-to-reg nodes chained together with token chain
517 // and flag operands which copy the outgoing args into the appropriate regs.
519 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
520 Chain = DAG.getCopyToReg(Chain, RegsToPass[i].first, RegsToPass[i].second,
522 InFlag = Chain.getValue(1);
525 // If the callee is a GlobalAddress/ExternalSymbol node (quite common, every
526 // direct call is) turn it into a TargetGlobalAddress/TargetExternalSymbol
527 // node so that legalize doesn't hack it.
528 bool isDirect = false;
529 bool isARMFunc = false;
530 bool isLocalARMFunc = false;
531 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
532 GlobalValue *GV = G->getGlobal();
534 bool isExt = (GV->isDeclaration() || GV->hasWeakLinkage() ||
535 GV->hasLinkOnceLinkage());
536 bool isStub = (isExt && Subtarget->isTargetDarwin()) &&
537 getTargetMachine().getRelocationModel() != Reloc::Static;
538 isARMFunc = !Subtarget->isThumb() || isStub;
539 // ARM call to a local ARM function is predicable.
540 isLocalARMFunc = !Subtarget->isThumb() && !isExt;
541 // tBX takes a register source operand.
542 if (isARMFunc && Subtarget->isThumb() && !Subtarget->hasV5TOps()) {
543 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(GV, ARMPCLabelIndex,
545 SDOperand CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 2);
546 CPAddr = DAG.getNode(ARMISD::Wrapper, MVT::i32, CPAddr);
547 Callee = DAG.getLoad(getPointerTy(), DAG.getEntryNode(), CPAddr, NULL, 0);
548 SDOperand PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
549 Callee = DAG.getNode(ARMISD::PIC_ADD, getPointerTy(), Callee, PICLabel);
551 Callee = DAG.getTargetGlobalAddress(GV, getPointerTy());
552 } else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) {
554 bool isStub = Subtarget->isTargetDarwin() &&
555 getTargetMachine().getRelocationModel() != Reloc::Static;
556 isARMFunc = !Subtarget->isThumb() || isStub;
557 // tBX takes a register source operand.
558 const char *Sym = S->getSymbol();
559 if (isARMFunc && Subtarget->isThumb() && !Subtarget->hasV5TOps()) {
560 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(Sym, ARMPCLabelIndex,
562 SDOperand CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 2);
563 CPAddr = DAG.getNode(ARMISD::Wrapper, MVT::i32, CPAddr);
564 Callee = DAG.getLoad(getPointerTy(), DAG.getEntryNode(), CPAddr, NULL, 0);
565 SDOperand PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
566 Callee = DAG.getNode(ARMISD::PIC_ADD, getPointerTy(), Callee, PICLabel);
568 Callee = DAG.getTargetExternalSymbol(Sym, getPointerTy());
571 // FIXME: handle tail calls differently.
573 if (Subtarget->isThumb()) {
574 if (!Subtarget->hasV5TOps() && (!isDirect || isARMFunc))
575 CallOpc = ARMISD::CALL_NOLINK;
577 CallOpc = isARMFunc ? ARMISD::CALL : ARMISD::tCALL;
579 CallOpc = (isDirect || Subtarget->hasV5TOps())
580 ? (isLocalARMFunc ? ARMISD::CALL_PRED : ARMISD::CALL)
581 : ARMISD::CALL_NOLINK;
583 if (CallOpc == ARMISD::CALL_NOLINK && !Subtarget->isThumb()) {
584 // implicit def LR - LR mustn't be allocated as GRP:$dst of CALL_NOLINK
585 Chain = DAG.getCopyToReg(Chain, ARM::LR,
586 DAG.getNode(ISD::UNDEF, MVT::i32), InFlag);
587 InFlag = Chain.getValue(1);
590 std::vector<SDOperand> Ops;
591 Ops.push_back(Chain);
592 Ops.push_back(Callee);
594 // Add argument registers to the end of the list so that they are known live
596 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
597 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
598 RegsToPass[i].second.getValueType()));
601 Ops.push_back(InFlag);
602 // Returns a chain and a flag for retval copy to use.
603 Chain = DAG.getNode(CallOpc, DAG.getVTList(MVT::Other, MVT::Flag),
604 &Ops[0], Ops.size());
605 InFlag = Chain.getValue(1);
607 Chain = DAG.getCALLSEQ_END(Chain,
608 DAG.getConstant(NumBytes, MVT::i32),
609 DAG.getConstant(0, MVT::i32),
611 if (RetVT != MVT::Other)
612 InFlag = Chain.getValue(1);
614 std::vector<SDOperand> ResultVals;
616 // If the call has results, copy the values out of the ret val registers.
617 switch (RetVT.getSimpleVT()) {
618 default: assert(0 && "Unexpected ret value!");
622 Chain = DAG.getCopyFromReg(Chain, ARM::R0, MVT::i32, InFlag).getValue(1);
623 ResultVals.push_back(Chain.getValue(0));
624 if (Op.Val->getValueType(1) == MVT::i32) {
625 // Returns a i64 value.
626 Chain = DAG.getCopyFromReg(Chain, ARM::R1, MVT::i32,
627 Chain.getValue(2)).getValue(1);
628 ResultVals.push_back(Chain.getValue(0));
632 Chain = DAG.getCopyFromReg(Chain, ARM::R0, MVT::i32, InFlag).getValue(1);
633 ResultVals.push_back(DAG.getNode(ISD::BIT_CONVERT, MVT::f32,
637 SDOperand Lo = DAG.getCopyFromReg(Chain, ARM::R0, MVT::i32, InFlag);
638 SDOperand Hi = DAG.getCopyFromReg(Lo, ARM::R1, MVT::i32, Lo.getValue(2));
639 ResultVals.push_back(DAG.getNode(ARMISD::FMDRR, MVT::f64, Lo, Hi));
644 if (ResultVals.empty())
647 ResultVals.push_back(Chain);
648 SDOperand Res = DAG.getMergeValues(&ResultVals[0], ResultVals.size());
649 return Res.getValue(Op.ResNo);
652 static SDOperand LowerRET(SDOperand Op, SelectionDAG &DAG) {
654 SDOperand Chain = Op.getOperand(0);
655 switch(Op.getNumOperands()) {
657 assert(0 && "Do not know how to return this many arguments!");
660 SDOperand LR = DAG.getRegister(ARM::LR, MVT::i32);
661 return DAG.getNode(ARMISD::RET_FLAG, MVT::Other, Chain);
664 Op = Op.getOperand(1);
665 if (Op.getValueType() == MVT::f32) {
666 Op = DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Op);
667 } else if (Op.getValueType() == MVT::f64) {
668 // Legalize ret f64 -> ret 2 x i32. We always have fmrrd if f64 is
670 Op = DAG.getNode(ARMISD::FMRRD, DAG.getVTList(MVT::i32, MVT::i32), &Op,1);
671 SDOperand Sign = DAG.getConstant(0, MVT::i32);
672 return DAG.getNode(ISD::RET, MVT::Other, Chain, Op, Sign,
673 Op.getValue(1), Sign);
675 Copy = DAG.getCopyToReg(Chain, ARM::R0, Op, SDOperand());
676 if (DAG.getMachineFunction().getRegInfo().liveout_empty())
677 DAG.getMachineFunction().getRegInfo().addLiveOut(ARM::R0);
680 Copy = DAG.getCopyToReg(Chain, ARM::R1, Op.getOperand(3), SDOperand());
681 Copy = DAG.getCopyToReg(Copy, ARM::R0, Op.getOperand(1), Copy.getValue(1));
682 // If we haven't noted the R0+R1 are live out, do so now.
683 if (DAG.getMachineFunction().getRegInfo().liveout_empty()) {
684 DAG.getMachineFunction().getRegInfo().addLiveOut(ARM::R0);
685 DAG.getMachineFunction().getRegInfo().addLiveOut(ARM::R1);
690 //We must use RET_FLAG instead of BRIND because BRIND doesn't have a flag
691 return DAG.getNode(ARMISD::RET_FLAG, MVT::Other, Copy, Copy.getValue(1));
694 // ConstantPool, JumpTable, GlobalAddress, and ExternalSymbol are lowered as
695 // their target countpart wrapped in the ARMISD::Wrapper node. Suppose N is
696 // one of the above mentioned nodes. It has to be wrapped because otherwise
697 // Select(N) returns N. So the raw TargetGlobalAddress nodes, etc. can only
698 // be used to form addressing mode. These wrapped nodes will be selected
700 static SDOperand LowerConstantPool(SDOperand Op, SelectionDAG &DAG) {
701 MVT PtrVT = Op.getValueType();
702 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
704 if (CP->isMachineConstantPoolEntry())
705 Res = DAG.getTargetConstantPool(CP->getMachineCPVal(), PtrVT,
708 Res = DAG.getTargetConstantPool(CP->getConstVal(), PtrVT,
710 return DAG.getNode(ARMISD::Wrapper, MVT::i32, Res);
713 // Lower ISD::GlobalTLSAddress using the "general dynamic" model
715 ARMTargetLowering::LowerToTLSGeneralDynamicModel(GlobalAddressSDNode *GA,
717 MVT PtrVT = getPointerTy();
718 unsigned char PCAdj = Subtarget->isThumb() ? 4 : 8;
719 ARMConstantPoolValue *CPV =
720 new ARMConstantPoolValue(GA->getGlobal(), ARMPCLabelIndex, ARMCP::CPValue,
721 PCAdj, "tlsgd", true);
722 SDOperand Argument = DAG.getTargetConstantPool(CPV, PtrVT, 2);
723 Argument = DAG.getNode(ARMISD::Wrapper, MVT::i32, Argument);
724 Argument = DAG.getLoad(PtrVT, DAG.getEntryNode(), Argument, NULL, 0);
725 SDOperand Chain = Argument.getValue(1);
727 SDOperand PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
728 Argument = DAG.getNode(ARMISD::PIC_ADD, PtrVT, Argument, PICLabel);
730 // call __tls_get_addr.
733 Entry.Node = Argument;
734 Entry.Ty = (const Type *) Type::Int32Ty;
735 Args.push_back(Entry);
736 std::pair<SDOperand, SDOperand> CallResult =
737 LowerCallTo(Chain, (const Type *) Type::Int32Ty, false, false, false,
738 CallingConv::C, false,
739 DAG.getExternalSymbol("__tls_get_addr", PtrVT), Args, DAG);
740 return CallResult.first;
743 // Lower ISD::GlobalTLSAddress using the "initial exec" or
744 // "local exec" model.
746 ARMTargetLowering::LowerToTLSExecModels(GlobalAddressSDNode *GA,
748 GlobalValue *GV = GA->getGlobal();
750 SDOperand Chain = DAG.getEntryNode();
751 MVT PtrVT = getPointerTy();
752 // Get the Thread Pointer
753 SDOperand ThreadPointer = DAG.getNode(ARMISD::THREAD_POINTER, PtrVT);
755 if (GV->isDeclaration()){
756 // initial exec model
757 unsigned char PCAdj = Subtarget->isThumb() ? 4 : 8;
758 ARMConstantPoolValue *CPV =
759 new ARMConstantPoolValue(GA->getGlobal(), ARMPCLabelIndex, ARMCP::CPValue,
760 PCAdj, "gottpoff", true);
761 Offset = DAG.getTargetConstantPool(CPV, PtrVT, 2);
762 Offset = DAG.getNode(ARMISD::Wrapper, MVT::i32, Offset);
763 Offset = DAG.getLoad(PtrVT, Chain, Offset, NULL, 0);
764 Chain = Offset.getValue(1);
766 SDOperand PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
767 Offset = DAG.getNode(ARMISD::PIC_ADD, PtrVT, Offset, PICLabel);
769 Offset = DAG.getLoad(PtrVT, Chain, Offset, NULL, 0);
772 ARMConstantPoolValue *CPV =
773 new ARMConstantPoolValue(GV, ARMCP::CPValue, "tpoff");
774 Offset = DAG.getTargetConstantPool(CPV, PtrVT, 2);
775 Offset = DAG.getNode(ARMISD::Wrapper, MVT::i32, Offset);
776 Offset = DAG.getLoad(PtrVT, Chain, Offset, NULL, 0);
779 // The address of the thread local variable is the add of the thread
780 // pointer with the offset of the variable.
781 return DAG.getNode(ISD::ADD, PtrVT, ThreadPointer, Offset);
785 ARMTargetLowering::LowerGlobalTLSAddress(SDOperand Op, SelectionDAG &DAG) {
786 // TODO: implement the "local dynamic" model
787 assert(Subtarget->isTargetELF() &&
788 "TLS not implemented for non-ELF targets");
789 GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(Op);
790 // If the relocation model is PIC, use the "General Dynamic" TLS Model,
791 // otherwise use the "Local Exec" TLS Model
792 if (getTargetMachine().getRelocationModel() == Reloc::PIC_)
793 return LowerToTLSGeneralDynamicModel(GA, DAG);
795 return LowerToTLSExecModels(GA, DAG);
798 SDOperand ARMTargetLowering::LowerGlobalAddressELF(SDOperand Op,
800 MVT PtrVT = getPointerTy();
801 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
802 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
803 if (RelocM == Reloc::PIC_) {
804 bool UseGOTOFF = GV->hasInternalLinkage() || GV->hasHiddenVisibility();
805 ARMConstantPoolValue *CPV =
806 new ARMConstantPoolValue(GV, ARMCP::CPValue, UseGOTOFF ? "GOTOFF":"GOT");
807 SDOperand CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 2);
808 CPAddr = DAG.getNode(ARMISD::Wrapper, MVT::i32, CPAddr);
809 SDOperand Result = DAG.getLoad(PtrVT, DAG.getEntryNode(), CPAddr, NULL, 0);
810 SDOperand Chain = Result.getValue(1);
811 SDOperand GOT = DAG.getNode(ISD::GLOBAL_OFFSET_TABLE, PtrVT);
812 Result = DAG.getNode(ISD::ADD, PtrVT, Result, GOT);
814 Result = DAG.getLoad(PtrVT, Chain, Result, NULL, 0);
817 SDOperand CPAddr = DAG.getTargetConstantPool(GV, PtrVT, 2);
818 CPAddr = DAG.getNode(ARMISD::Wrapper, MVT::i32, CPAddr);
819 return DAG.getLoad(PtrVT, DAG.getEntryNode(), CPAddr, NULL, 0);
823 /// GVIsIndirectSymbol - true if the GV will be accessed via an indirect symbol
824 /// even in non-static mode.
825 static bool GVIsIndirectSymbol(GlobalValue *GV, Reloc::Model RelocM) {
826 return RelocM != Reloc::Static &&
827 (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() ||
828 (GV->isDeclaration() && !GV->hasNotBeenReadFromBitcode()));
831 SDOperand ARMTargetLowering::LowerGlobalAddressDarwin(SDOperand Op,
833 MVT PtrVT = getPointerTy();
834 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
835 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
836 bool IsIndirect = GVIsIndirectSymbol(GV, RelocM);
838 if (RelocM == Reloc::Static)
839 CPAddr = DAG.getTargetConstantPool(GV, PtrVT, 2);
841 unsigned PCAdj = (RelocM != Reloc::PIC_)
842 ? 0 : (Subtarget->isThumb() ? 4 : 8);
843 ARMCP::ARMCPKind Kind = IsIndirect ? ARMCP::CPNonLazyPtr
845 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(GV, ARMPCLabelIndex,
847 CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 2);
849 CPAddr = DAG.getNode(ARMISD::Wrapper, MVT::i32, CPAddr);
851 SDOperand Result = DAG.getLoad(PtrVT, DAG.getEntryNode(), CPAddr, NULL, 0);
852 SDOperand Chain = Result.getValue(1);
854 if (RelocM == Reloc::PIC_) {
855 SDOperand PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
856 Result = DAG.getNode(ARMISD::PIC_ADD, PtrVT, Result, PICLabel);
859 Result = DAG.getLoad(PtrVT, Chain, Result, NULL, 0);
864 SDOperand ARMTargetLowering::LowerGLOBAL_OFFSET_TABLE(SDOperand Op,
866 assert(Subtarget->isTargetELF() &&
867 "GLOBAL OFFSET TABLE not implemented for non-ELF targets");
868 MVT PtrVT = getPointerTy();
869 unsigned PCAdj = Subtarget->isThumb() ? 4 : 8;
870 ARMConstantPoolValue *CPV = new ARMConstantPoolValue("_GLOBAL_OFFSET_TABLE_",
872 ARMCP::CPValue, PCAdj);
873 SDOperand CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 2);
874 CPAddr = DAG.getNode(ARMISD::Wrapper, MVT::i32, CPAddr);
875 SDOperand Result = DAG.getLoad(PtrVT, DAG.getEntryNode(), CPAddr, NULL, 0);
876 SDOperand PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
877 return DAG.getNode(ARMISD::PIC_ADD, PtrVT, Result, PICLabel);
880 static SDOperand LowerINTRINSIC_WO_CHAIN(SDOperand Op, SelectionDAG &DAG) {
881 MVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
882 unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getValue();
884 default: return SDOperand(); // Don't custom lower most intrinsics.
885 case Intrinsic::arm_thread_pointer:
886 return DAG.getNode(ARMISD::THREAD_POINTER, PtrVT);
890 static SDOperand LowerVASTART(SDOperand Op, SelectionDAG &DAG,
891 unsigned VarArgsFrameIndex) {
892 // vastart just stores the address of the VarArgsFrameIndex slot into the
893 // memory location argument.
894 MVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
895 SDOperand FR = DAG.getFrameIndex(VarArgsFrameIndex, PtrVT);
896 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
897 return DAG.getStore(Op.getOperand(0), FR, Op.getOperand(1), SV, 0);
900 static SDOperand LowerFORMAL_ARGUMENT(SDOperand Op, SelectionDAG &DAG,
901 unsigned ArgNo, unsigned &NumGPRs,
902 unsigned &ArgOffset) {
903 MachineFunction &MF = DAG.getMachineFunction();
904 MVT ObjectVT = Op.getValue(ArgNo).getValueType();
905 SDOperand Root = Op.getOperand(0);
906 std::vector<SDOperand> ArgValues;
907 MachineRegisterInfo &RegInfo = MF.getRegInfo();
909 static const unsigned GPRArgRegs[] = {
910 ARM::R0, ARM::R1, ARM::R2, ARM::R3
917 ISD::ArgFlagsTy Flags =
918 cast<ARG_FLAGSSDNode>(Op.getOperand(ArgNo + 3))->getArgFlags();
919 HowToPassArgument(ObjectVT, NumGPRs, ArgOffset, ObjGPRs,
920 ObjSize, GPRPad, StackPad, Flags);
922 ArgOffset += StackPad;
926 unsigned VReg = RegInfo.createVirtualRegister(&ARM::GPRRegClass);
927 RegInfo.addLiveIn(GPRArgRegs[NumGPRs], VReg);
928 ArgValue = DAG.getCopyFromReg(Root, VReg, MVT::i32);
929 if (ObjectVT == MVT::f32)
930 ArgValue = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, ArgValue);
931 } else if (ObjGPRs == 2) {
932 unsigned VReg = RegInfo.createVirtualRegister(&ARM::GPRRegClass);
933 RegInfo.addLiveIn(GPRArgRegs[NumGPRs], VReg);
934 ArgValue = DAG.getCopyFromReg(Root, VReg, MVT::i32);
936 VReg = RegInfo.createVirtualRegister(&ARM::GPRRegClass);
937 RegInfo.addLiveIn(GPRArgRegs[NumGPRs+1], VReg);
938 SDOperand ArgValue2 = DAG.getCopyFromReg(Root, VReg, MVT::i32);
940 assert(ObjectVT != MVT::i64 && "i64 should already be lowered");
941 ArgValue = DAG.getNode(ARMISD::FMDRR, MVT::f64, ArgValue, ArgValue2);
946 MachineFrameInfo *MFI = MF.getFrameInfo();
947 int FI = MFI->CreateFixedObject(ObjSize, ArgOffset);
948 SDOperand FIN = DAG.getFrameIndex(FI, MVT::i32);
950 ArgValue = DAG.getLoad(ObjectVT, Root, FIN, NULL, 0);
952 SDOperand ArgValue2 = DAG.getLoad(MVT::i32, Root, FIN, NULL, 0);
953 assert(ObjectVT != MVT::i64 && "i64 should already be lowered");
954 ArgValue = DAG.getNode(ARMISD::FMDRR, MVT::f64, ArgValue, ArgValue2);
957 ArgOffset += ObjSize; // Move on to the next argument.
964 ARMTargetLowering::LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG) {
965 std::vector<SDOperand> ArgValues;
966 SDOperand Root = Op.getOperand(0);
967 unsigned ArgOffset = 0; // Frame mechanisms handle retaddr slot
968 unsigned NumGPRs = 0; // GPRs used for parameter passing.
970 unsigned NumArgs = Op.Val->getNumValues()-1;
971 for (unsigned ArgNo = 0; ArgNo < NumArgs; ++ArgNo)
972 ArgValues.push_back(LowerFORMAL_ARGUMENT(Op, DAG, ArgNo,
973 NumGPRs, ArgOffset));
975 bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getValue() != 0;
977 static const unsigned GPRArgRegs[] = {
978 ARM::R0, ARM::R1, ARM::R2, ARM::R3
981 MachineFunction &MF = DAG.getMachineFunction();
982 MachineRegisterInfo &RegInfo = MF.getRegInfo();
983 MachineFrameInfo *MFI = MF.getFrameInfo();
984 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
985 unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
986 unsigned VARegSize = (4 - NumGPRs) * 4;
987 unsigned VARegSaveSize = (VARegSize + Align - 1) & ~(Align - 1);
989 // If this function is vararg, store any remaining integer argument regs
990 // to their spots on the stack so that they may be loaded by deferencing
991 // the result of va_next.
992 AFI->setVarArgsRegSaveSize(VARegSaveSize);
993 VarArgsFrameIndex = MFI->CreateFixedObject(VARegSaveSize, ArgOffset +
994 VARegSaveSize - VARegSize);
995 SDOperand FIN = DAG.getFrameIndex(VarArgsFrameIndex, getPointerTy());
997 SmallVector<SDOperand, 4> MemOps;
998 for (; NumGPRs < 4; ++NumGPRs) {
999 unsigned VReg = RegInfo.createVirtualRegister(&ARM::GPRRegClass);
1000 RegInfo.addLiveIn(GPRArgRegs[NumGPRs], VReg);
1001 SDOperand Val = DAG.getCopyFromReg(Root, VReg, MVT::i32);
1002 SDOperand Store = DAG.getStore(Val.getValue(1), Val, FIN, NULL, 0);
1003 MemOps.push_back(Store);
1004 FIN = DAG.getNode(ISD::ADD, getPointerTy(), FIN,
1005 DAG.getConstant(4, getPointerTy()));
1007 if (!MemOps.empty())
1008 Root = DAG.getNode(ISD::TokenFactor, MVT::Other,
1009 &MemOps[0], MemOps.size());
1011 // This will point to the next argument passed via stack.
1012 VarArgsFrameIndex = MFI->CreateFixedObject(4, ArgOffset);
1015 ArgValues.push_back(Root);
1017 // Return the new list of results.
1018 return DAG.getMergeValues(Op.Val->getVTList(), &ArgValues[0],
1022 /// isFloatingPointZero - Return true if this is +0.0.
1023 static bool isFloatingPointZero(SDOperand Op) {
1024 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(Op))
1025 return CFP->getValueAPF().isPosZero();
1026 else if (ISD::isEXTLoad(Op.Val) || ISD::isNON_EXTLoad(Op.Val)) {
1027 // Maybe this has already been legalized into the constant pool?
1028 if (Op.getOperand(1).getOpcode() == ARMISD::Wrapper) {
1029 SDOperand WrapperOp = Op.getOperand(1).getOperand(0);
1030 if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(WrapperOp))
1031 if (ConstantFP *CFP = dyn_cast<ConstantFP>(CP->getConstVal()))
1032 return CFP->getValueAPF().isPosZero();
1038 static bool isLegalCmpImmediate(unsigned C, bool isThumb) {
1039 return ( isThumb && (C & ~255U) == 0) ||
1040 (!isThumb && ARM_AM::getSOImmVal(C) != -1);
1043 /// Returns appropriate ARM CMP (cmp) and corresponding condition code for
1044 /// the given operands.
1045 static SDOperand getARMCmp(SDOperand LHS, SDOperand RHS, ISD::CondCode CC,
1046 SDOperand &ARMCC, SelectionDAG &DAG, bool isThumb) {
1047 if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(RHS.Val)) {
1048 unsigned C = RHSC->getValue();
1049 if (!isLegalCmpImmediate(C, isThumb)) {
1050 // Constant does not fit, try adjusting it by one?
1055 if (isLegalCmpImmediate(C-1, isThumb)) {
1056 CC = (CC == ISD::SETLT) ? ISD::SETLE : ISD::SETGT;
1057 RHS = DAG.getConstant(C-1, MVT::i32);
1062 if (C > 0 && isLegalCmpImmediate(C-1, isThumb)) {
1063 CC = (CC == ISD::SETULT) ? ISD::SETULE : ISD::SETUGT;
1064 RHS = DAG.getConstant(C-1, MVT::i32);
1069 if (isLegalCmpImmediate(C+1, isThumb)) {
1070 CC = (CC == ISD::SETLE) ? ISD::SETLT : ISD::SETGE;
1071 RHS = DAG.getConstant(C+1, MVT::i32);
1076 if (C < 0xffffffff && isLegalCmpImmediate(C+1, isThumb)) {
1077 CC = (CC == ISD::SETULE) ? ISD::SETULT : ISD::SETUGE;
1078 RHS = DAG.getConstant(C+1, MVT::i32);
1085 ARMCC::CondCodes CondCode = IntCCToARMCC(CC);
1086 ARMISD::NodeType CompareType;
1089 CompareType = ARMISD::CMP;
1095 // Uses only N and Z Flags
1096 CompareType = ARMISD::CMPNZ;
1099 ARMCC = DAG.getConstant(CondCode, MVT::i32);
1100 return DAG.getNode(CompareType, MVT::Flag, LHS, RHS);
1103 /// Returns a appropriate VFP CMP (fcmp{s|d}+fmstat) for the given operands.
1104 static SDOperand getVFPCmp(SDOperand LHS, SDOperand RHS, SelectionDAG &DAG) {
1106 if (!isFloatingPointZero(RHS))
1107 Cmp = DAG.getNode(ARMISD::CMPFP, MVT::Flag, LHS, RHS);
1109 Cmp = DAG.getNode(ARMISD::CMPFPw0, MVT::Flag, LHS);
1110 return DAG.getNode(ARMISD::FMSTAT, MVT::Flag, Cmp);
1113 static SDOperand LowerSELECT_CC(SDOperand Op, SelectionDAG &DAG,
1114 const ARMSubtarget *ST) {
1115 MVT VT = Op.getValueType();
1116 SDOperand LHS = Op.getOperand(0);
1117 SDOperand RHS = Op.getOperand(1);
1118 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
1119 SDOperand TrueVal = Op.getOperand(2);
1120 SDOperand FalseVal = Op.getOperand(3);
1122 if (LHS.getValueType() == MVT::i32) {
1124 SDOperand CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1125 SDOperand Cmp = getARMCmp(LHS, RHS, CC, ARMCC, DAG, ST->isThumb());
1126 return DAG.getNode(ARMISD::CMOV, VT, FalseVal, TrueVal, ARMCC, CCR, Cmp);
1129 ARMCC::CondCodes CondCode, CondCode2;
1130 if (FPCCToARMCC(CC, CondCode, CondCode2))
1131 std::swap(TrueVal, FalseVal);
1133 SDOperand ARMCC = DAG.getConstant(CondCode, MVT::i32);
1134 SDOperand CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1135 SDOperand Cmp = getVFPCmp(LHS, RHS, DAG);
1136 SDOperand Result = DAG.getNode(ARMISD::CMOV, VT, FalseVal, TrueVal,
1138 if (CondCode2 != ARMCC::AL) {
1139 SDOperand ARMCC2 = DAG.getConstant(CondCode2, MVT::i32);
1140 // FIXME: Needs another CMP because flag can have but one use.
1141 SDOperand Cmp2 = getVFPCmp(LHS, RHS, DAG);
1142 Result = DAG.getNode(ARMISD::CMOV, VT, Result, TrueVal, ARMCC2, CCR, Cmp2);
1147 static SDOperand LowerBR_CC(SDOperand Op, SelectionDAG &DAG,
1148 const ARMSubtarget *ST) {
1149 SDOperand Chain = Op.getOperand(0);
1150 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
1151 SDOperand LHS = Op.getOperand(2);
1152 SDOperand RHS = Op.getOperand(3);
1153 SDOperand Dest = Op.getOperand(4);
1155 if (LHS.getValueType() == MVT::i32) {
1157 SDOperand CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1158 SDOperand Cmp = getARMCmp(LHS, RHS, CC, ARMCC, DAG, ST->isThumb());
1159 return DAG.getNode(ARMISD::BRCOND, MVT::Other, Chain, Dest, ARMCC, CCR,Cmp);
1162 assert(LHS.getValueType() == MVT::f32 || LHS.getValueType() == MVT::f64);
1163 ARMCC::CondCodes CondCode, CondCode2;
1164 if (FPCCToARMCC(CC, CondCode, CondCode2))
1165 // Swap the LHS/RHS of the comparison if needed.
1166 std::swap(LHS, RHS);
1168 SDOperand Cmp = getVFPCmp(LHS, RHS, DAG);
1169 SDOperand ARMCC = DAG.getConstant(CondCode, MVT::i32);
1170 SDOperand CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1171 SDVTList VTList = DAG.getVTList(MVT::Other, MVT::Flag);
1172 SDOperand Ops[] = { Chain, Dest, ARMCC, CCR, Cmp };
1173 SDOperand Res = DAG.getNode(ARMISD::BRCOND, VTList, Ops, 5);
1174 if (CondCode2 != ARMCC::AL) {
1175 ARMCC = DAG.getConstant(CondCode2, MVT::i32);
1176 SDOperand Ops[] = { Res, Dest, ARMCC, CCR, Res.getValue(1) };
1177 Res = DAG.getNode(ARMISD::BRCOND, VTList, Ops, 5);
1182 SDOperand ARMTargetLowering::LowerBR_JT(SDOperand Op, SelectionDAG &DAG) {
1183 SDOperand Chain = Op.getOperand(0);
1184 SDOperand Table = Op.getOperand(1);
1185 SDOperand Index = Op.getOperand(2);
1187 MVT PTy = getPointerTy();
1188 JumpTableSDNode *JT = cast<JumpTableSDNode>(Table);
1189 ARMFunctionInfo *AFI = DAG.getMachineFunction().getInfo<ARMFunctionInfo>();
1190 SDOperand UId = DAG.getConstant(AFI->createJumpTableUId(), PTy);
1191 SDOperand JTI = DAG.getTargetJumpTable(JT->getIndex(), PTy);
1192 Table = DAG.getNode(ARMISD::WrapperJT, MVT::i32, JTI, UId);
1193 Index = DAG.getNode(ISD::MUL, PTy, Index, DAG.getConstant(4, PTy));
1194 SDOperand Addr = DAG.getNode(ISD::ADD, PTy, Index, Table);
1195 bool isPIC = getTargetMachine().getRelocationModel() == Reloc::PIC_;
1196 Addr = DAG.getLoad(isPIC ? (MVT)MVT::i32 : PTy,
1197 Chain, Addr, NULL, 0);
1198 Chain = Addr.getValue(1);
1200 Addr = DAG.getNode(ISD::ADD, PTy, Addr, Table);
1201 return DAG.getNode(ARMISD::BR_JT, MVT::Other, Chain, Addr, JTI, UId);
1204 static SDOperand LowerFP_TO_INT(SDOperand Op, SelectionDAG &DAG) {
1206 Op.getOpcode() == ISD::FP_TO_SINT ? ARMISD::FTOSI : ARMISD::FTOUI;
1207 Op = DAG.getNode(Opc, MVT::f32, Op.getOperand(0));
1208 return DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Op);
1211 static SDOperand LowerINT_TO_FP(SDOperand Op, SelectionDAG &DAG) {
1212 MVT VT = Op.getValueType();
1214 Op.getOpcode() == ISD::SINT_TO_FP ? ARMISD::SITOF : ARMISD::UITOF;
1216 Op = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, Op.getOperand(0));
1217 return DAG.getNode(Opc, VT, Op);
1220 static SDOperand LowerFCOPYSIGN(SDOperand Op, SelectionDAG &DAG) {
1221 // Implement fcopysign with a fabs and a conditional fneg.
1222 SDOperand Tmp0 = Op.getOperand(0);
1223 SDOperand Tmp1 = Op.getOperand(1);
1224 MVT VT = Op.getValueType();
1225 MVT SrcVT = Tmp1.getValueType();
1226 SDOperand AbsVal = DAG.getNode(ISD::FABS, VT, Tmp0);
1227 SDOperand Cmp = getVFPCmp(Tmp1, DAG.getConstantFP(0.0, SrcVT), DAG);
1228 SDOperand ARMCC = DAG.getConstant(ARMCC::LT, MVT::i32);
1229 SDOperand CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1230 return DAG.getNode(ARMISD::CNEG, VT, AbsVal, AbsVal, ARMCC, CCR, Cmp);
1234 ARMTargetLowering::EmitTargetCodeForMemcpy(SelectionDAG &DAG,
1236 SDOperand Dst, SDOperand Src,
1237 SDOperand Size, unsigned Align,
1239 const Value *DstSV, uint64_t DstSVOff,
1240 const Value *SrcSV, uint64_t SrcSVOff){
1241 // Do repeated 4-byte loads and stores. To be improved.
1242 // This requires 4-byte alignment.
1243 if ((Align & 3) != 0)
1245 // This requires the copy size to be a constant, preferrably
1246 // within a subtarget-specific limit.
1247 ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
1250 uint64_t SizeVal = ConstantSize->getValue();
1251 if (!AlwaysInline && SizeVal > getSubtarget()->getMaxInlineSizeThreshold())
1254 unsigned BytesLeft = SizeVal & 3;
1255 unsigned NumMemOps = SizeVal >> 2;
1256 unsigned EmittedNumMemOps = 0;
1258 unsigned VTSize = 4;
1260 const unsigned MAX_LOADS_IN_LDM = 6;
1261 SDOperand TFOps[MAX_LOADS_IN_LDM];
1262 SDOperand Loads[MAX_LOADS_IN_LDM];
1263 uint64_t SrcOff = 0, DstOff = 0;
1265 // Emit up to MAX_LOADS_IN_LDM loads, then a TokenFactor barrier, then the
1266 // same number of stores. The loads and stores will get combined into
1267 // ldm/stm later on.
1268 while (EmittedNumMemOps < NumMemOps) {
1270 i < MAX_LOADS_IN_LDM && EmittedNumMemOps + i < NumMemOps; ++i) {
1271 Loads[i] = DAG.getLoad(VT, Chain,
1272 DAG.getNode(ISD::ADD, MVT::i32, Src,
1273 DAG.getConstant(SrcOff, MVT::i32)),
1274 SrcSV, SrcSVOff + SrcOff);
1275 TFOps[i] = Loads[i].getValue(1);
1278 Chain = DAG.getNode(ISD::TokenFactor, MVT::Other, &TFOps[0], i);
1281 i < MAX_LOADS_IN_LDM && EmittedNumMemOps + i < NumMemOps; ++i) {
1282 TFOps[i] = DAG.getStore(Chain, Loads[i],
1283 DAG.getNode(ISD::ADD, MVT::i32, Dst,
1284 DAG.getConstant(DstOff, MVT::i32)),
1285 DstSV, DstSVOff + DstOff);
1288 Chain = DAG.getNode(ISD::TokenFactor, MVT::Other, &TFOps[0], i);
1290 EmittedNumMemOps += i;
1296 // Issue loads / stores for the trailing (1 - 3) bytes.
1297 unsigned BytesLeftSave = BytesLeft;
1300 if (BytesLeft >= 2) {
1308 Loads[i] = DAG.getLoad(VT, Chain,
1309 DAG.getNode(ISD::ADD, MVT::i32, Src,
1310 DAG.getConstant(SrcOff, MVT::i32)),
1311 SrcSV, SrcSVOff + SrcOff);
1312 TFOps[i] = Loads[i].getValue(1);
1315 BytesLeft -= VTSize;
1317 Chain = DAG.getNode(ISD::TokenFactor, MVT::Other, &TFOps[0], i);
1320 BytesLeft = BytesLeftSave;
1322 if (BytesLeft >= 2) {
1330 TFOps[i] = DAG.getStore(Chain, Loads[i],
1331 DAG.getNode(ISD::ADD, MVT::i32, Dst,
1332 DAG.getConstant(DstOff, MVT::i32)),
1333 DstSV, DstSVOff + DstOff);
1336 BytesLeft -= VTSize;
1338 return DAG.getNode(ISD::TokenFactor, MVT::Other, &TFOps[0], i);
1341 static SDNode *ExpandBIT_CONVERT(SDNode *N, SelectionDAG &DAG) {
1342 // Turn f64->i64 into FMRRD.
1343 assert(N->getValueType(0) == MVT::i64 &&
1344 N->getOperand(0).getValueType() == MVT::f64);
1346 SDOperand Op = N->getOperand(0);
1347 SDOperand Cvt = DAG.getNode(ARMISD::FMRRD, DAG.getVTList(MVT::i32, MVT::i32),
1350 // Merge the pieces into a single i64 value.
1351 return DAG.getNode(ISD::BUILD_PAIR, MVT::i64, Cvt, Cvt.getValue(1)).Val;
1354 static SDNode *ExpandSRx(SDNode *N, SelectionDAG &DAG, const ARMSubtarget *ST) {
1355 assert(N->getValueType(0) == MVT::i64 &&
1356 (N->getOpcode() == ISD::SRL || N->getOpcode() == ISD::SRA) &&
1357 "Unknown shift to lower!");
1359 // We only lower SRA, SRL of 1 here, all others use generic lowering.
1360 if (!isa<ConstantSDNode>(N->getOperand(1)) ||
1361 cast<ConstantSDNode>(N->getOperand(1))->getValue() != 1)
1364 // If we are in thumb mode, we don't have RRX.
1365 if (ST->isThumb()) return 0;
1367 // Okay, we have a 64-bit SRA or SRL of 1. Lower this to an RRX expr.
1368 SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, N->getOperand(0),
1369 DAG.getConstant(0, MVT::i32));
1370 SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, N->getOperand(0),
1371 DAG.getConstant(1, MVT::i32));
1373 // First, build a SRA_FLAG/SRL_FLAG op, which shifts the top part by one and
1374 // captures the result into a carry flag.
1375 unsigned Opc = N->getOpcode() == ISD::SRL ? ARMISD::SRL_FLAG:ARMISD::SRA_FLAG;
1376 Hi = DAG.getNode(Opc, DAG.getVTList(MVT::i32, MVT::Flag), &Hi, 1);
1378 // The low part is an ARMISD::RRX operand, which shifts the carry in.
1379 Lo = DAG.getNode(ARMISD::RRX, MVT::i32, Lo, Hi.getValue(1));
1381 // Merge the pieces into a single i64 value.
1382 return DAG.getNode(ISD::BUILD_PAIR, MVT::i64, Lo, Hi).Val;
1386 SDOperand ARMTargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
1387 switch (Op.getOpcode()) {
1388 default: assert(0 && "Don't know how to custom lower this!"); abort();
1389 case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
1390 case ISD::GlobalAddress:
1391 return Subtarget->isTargetDarwin() ? LowerGlobalAddressDarwin(Op, DAG) :
1392 LowerGlobalAddressELF(Op, DAG);
1393 case ISD::GlobalTLSAddress: return LowerGlobalTLSAddress(Op, DAG);
1394 case ISD::CALL: return LowerCALL(Op, DAG);
1395 case ISD::RET: return LowerRET(Op, DAG);
1396 case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG, Subtarget);
1397 case ISD::BR_CC: return LowerBR_CC(Op, DAG, Subtarget);
1398 case ISD::BR_JT: return LowerBR_JT(Op, DAG);
1399 case ISD::VASTART: return LowerVASTART(Op, DAG, VarArgsFrameIndex);
1400 case ISD::SINT_TO_FP:
1401 case ISD::UINT_TO_FP: return LowerINT_TO_FP(Op, DAG);
1402 case ISD::FP_TO_SINT:
1403 case ISD::FP_TO_UINT: return LowerFP_TO_INT(Op, DAG);
1404 case ISD::FCOPYSIGN: return LowerFCOPYSIGN(Op, DAG);
1405 case ISD::FORMAL_ARGUMENTS: return LowerFORMAL_ARGUMENTS(Op, DAG);
1406 case ISD::RETURNADDR: break;
1407 case ISD::FRAMEADDR: break;
1408 case ISD::GLOBAL_OFFSET_TABLE: return LowerGLOBAL_OFFSET_TABLE(Op, DAG);
1409 case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG);
1412 // FIXME: Remove these when LegalizeDAGTypes lands.
1413 case ISD::BIT_CONVERT: return SDOperand(ExpandBIT_CONVERT(Op.Val, DAG), 0);
1415 case ISD::SRA: return SDOperand(ExpandSRx(Op.Val, DAG,Subtarget),0);
1421 /// ReplaceNodeResults - Provide custom lowering hooks for nodes with illegal
1423 SDNode *ARMTargetLowering::ReplaceNodeResults(SDNode *N, SelectionDAG &DAG) {
1424 switch (N->getOpcode()) {
1425 default: assert(0 && "Don't know how to custom expand this!"); abort();
1426 case ISD::BIT_CONVERT: return ExpandBIT_CONVERT(N, DAG);
1428 case ISD::SRA: return ExpandSRx(N, DAG, Subtarget);
1433 //===----------------------------------------------------------------------===//
1434 // ARM Scheduler Hooks
1435 //===----------------------------------------------------------------------===//
1438 ARMTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
1439 MachineBasicBlock *BB) {
1440 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
1441 switch (MI->getOpcode()) {
1442 default: assert(false && "Unexpected instr type to insert");
1443 case ARM::tMOVCCr: {
1444 // To "insert" a SELECT_CC instruction, we actually have to insert the
1445 // diamond control-flow pattern. The incoming instruction knows the
1446 // destination vreg to set, the condition code register to branch on, the
1447 // true/false values to select between, and a branch opcode to use.
1448 const BasicBlock *LLVM_BB = BB->getBasicBlock();
1449 MachineFunction::iterator It = BB;
1455 // cmpTY ccX, r1, r2
1457 // fallthrough --> copy0MBB
1458 MachineBasicBlock *thisMBB = BB;
1459 MachineFunction *F = BB->getParent();
1460 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
1461 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
1462 BuildMI(BB, TII->get(ARM::tBcc)).addMBB(sinkMBB)
1463 .addImm(MI->getOperand(3).getImm()).addReg(MI->getOperand(4).getReg());
1464 F->insert(It, copy0MBB);
1465 F->insert(It, sinkMBB);
1466 // Update machine-CFG edges by first adding all successors of the current
1467 // block to the new block which will contain the Phi node for the select.
1468 for(MachineBasicBlock::succ_iterator i = BB->succ_begin(),
1469 e = BB->succ_end(); i != e; ++i)
1470 sinkMBB->addSuccessor(*i);
1471 // Next, remove all successors of the current block, and add the true
1472 // and fallthrough blocks as its successors.
1473 while(!BB->succ_empty())
1474 BB->removeSuccessor(BB->succ_begin());
1475 BB->addSuccessor(copy0MBB);
1476 BB->addSuccessor(sinkMBB);
1479 // %FalseValue = ...
1480 // # fallthrough to sinkMBB
1483 // Update machine-CFG edges
1484 BB->addSuccessor(sinkMBB);
1487 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
1490 BuildMI(BB, TII->get(ARM::PHI), MI->getOperand(0).getReg())
1491 .addReg(MI->getOperand(1).getReg()).addMBB(copy0MBB)
1492 .addReg(MI->getOperand(2).getReg()).addMBB(thisMBB);
1494 F->DeleteMachineInstr(MI); // The pseudo instruction is gone now.
1500 //===----------------------------------------------------------------------===//
1501 // ARM Optimization Hooks
1502 //===----------------------------------------------------------------------===//
1504 /// PerformFMRRDCombine - Target-specific dag combine xforms for ARMISD::FMRRD.
1505 static SDOperand PerformFMRRDCombine(SDNode *N,
1506 TargetLowering::DAGCombinerInfo &DCI) {
1507 // fmrrd(fmdrr x, y) -> x,y
1508 SDOperand InDouble = N->getOperand(0);
1509 if (InDouble.getOpcode() == ARMISD::FMDRR)
1510 return DCI.CombineTo(N, InDouble.getOperand(0), InDouble.getOperand(1));
1514 SDOperand ARMTargetLowering::PerformDAGCombine(SDNode *N,
1515 DAGCombinerInfo &DCI) const {
1516 switch (N->getOpcode()) {
1518 case ARMISD::FMRRD: return PerformFMRRDCombine(N, DCI);
1525 /// isLegalAddressImmediate - Return true if the integer value can be used
1526 /// as the offset of the target addressing mode for load / store of the
1528 static bool isLegalAddressImmediate(int64_t V, MVT VT,
1529 const ARMSubtarget *Subtarget) {
1533 if (Subtarget->isThumb()) {
1538 switch (VT.getSimpleVT()) {
1539 default: return false;
1554 if ((V & (Scale - 1)) != 0)
1557 return V == (V & ((1LL << 5) - 1));
1562 switch (VT.getSimpleVT()) {
1563 default: return false;
1568 return V == (V & ((1LL << 12) - 1));
1571 return V == (V & ((1LL << 8) - 1));
1574 if (!Subtarget->hasVFP2())
1579 return V == (V & ((1LL << 8) - 1));
1583 /// isLegalAddressingMode - Return true if the addressing mode represented
1584 /// by AM is legal for this target, for a load/store of the specified type.
1585 bool ARMTargetLowering::isLegalAddressingMode(const AddrMode &AM,
1586 const Type *Ty) const {
1587 if (!isLegalAddressImmediate(AM.BaseOffs, getValueType(Ty), Subtarget))
1590 // Can never fold addr of global into load/store.
1595 case 0: // no scale reg, must be "r+i" or "r", or "i".
1598 if (Subtarget->isThumb())
1602 // ARM doesn't support any R+R*scale+imm addr modes.
1606 int Scale = AM.Scale;
1607 switch (getValueType(Ty).getSimpleVT()) {
1608 default: return false;
1613 // This assumes i64 is legalized to a pair of i32. If not (i.e.
1614 // ldrd / strd are used, then its address mode is same as i16.
1616 if (Scale < 0) Scale = -Scale;
1620 return isPowerOf2_32(Scale & ~1);
1623 if (((unsigned)AM.HasBaseReg + Scale) <= 2)
1628 // Note, we allow "void" uses (basically, uses that aren't loads or
1629 // stores), because arm allows folding a scale into many arithmetic
1630 // operations. This should be made more precise and revisited later.
1632 // Allow r << imm, but the imm has to be a multiple of two.
1633 if (AM.Scale & 1) return false;
1634 return isPowerOf2_32(AM.Scale);
1642 static bool getIndexedAddressParts(SDNode *Ptr, MVT VT,
1643 bool isSEXTLoad, SDOperand &Base,
1644 SDOperand &Offset, bool &isInc,
1645 SelectionDAG &DAG) {
1646 if (Ptr->getOpcode() != ISD::ADD && Ptr->getOpcode() != ISD::SUB)
1649 if (VT == MVT::i16 || ((VT == MVT::i8 || VT == MVT::i1) && isSEXTLoad)) {
1651 Base = Ptr->getOperand(0);
1652 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) {
1653 int RHSC = (int)RHS->getValue();
1654 if (RHSC < 0 && RHSC > -256) {
1656 Offset = DAG.getConstant(-RHSC, RHS->getValueType(0));
1660 isInc = (Ptr->getOpcode() == ISD::ADD);
1661 Offset = Ptr->getOperand(1);
1663 } else if (VT == MVT::i32 || VT == MVT::i8 || VT == MVT::i1) {
1665 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) {
1666 int RHSC = (int)RHS->getValue();
1667 if (RHSC < 0 && RHSC > -0x1000) {
1669 Offset = DAG.getConstant(-RHSC, RHS->getValueType(0));
1670 Base = Ptr->getOperand(0);
1675 if (Ptr->getOpcode() == ISD::ADD) {
1677 ARM_AM::ShiftOpc ShOpcVal= ARM_AM::getShiftOpcForNode(Ptr->getOperand(0));
1678 if (ShOpcVal != ARM_AM::no_shift) {
1679 Base = Ptr->getOperand(1);
1680 Offset = Ptr->getOperand(0);
1682 Base = Ptr->getOperand(0);
1683 Offset = Ptr->getOperand(1);
1688 isInc = (Ptr->getOpcode() == ISD::ADD);
1689 Base = Ptr->getOperand(0);
1690 Offset = Ptr->getOperand(1);
1694 // FIXME: Use FLDM / FSTM to emulate indexed FP load / store.
1698 /// getPreIndexedAddressParts - returns true by value, base pointer and
1699 /// offset pointer and addressing mode by reference if the node's address
1700 /// can be legally represented as pre-indexed load / store address.
1702 ARMTargetLowering::getPreIndexedAddressParts(SDNode *N, SDOperand &Base,
1704 ISD::MemIndexedMode &AM,
1705 SelectionDAG &DAG) {
1706 if (Subtarget->isThumb())
1711 bool isSEXTLoad = false;
1712 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
1713 Ptr = LD->getBasePtr();
1714 VT = LD->getMemoryVT();
1715 isSEXTLoad = LD->getExtensionType() == ISD::SEXTLOAD;
1716 } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
1717 Ptr = ST->getBasePtr();
1718 VT = ST->getMemoryVT();
1723 bool isLegal = getIndexedAddressParts(Ptr.Val, VT, isSEXTLoad, Base, Offset,
1726 AM = isInc ? ISD::PRE_INC : ISD::PRE_DEC;
1732 /// getPostIndexedAddressParts - returns true by value, base pointer and
1733 /// offset pointer and addressing mode by reference if this node can be
1734 /// combined with a load / store to form a post-indexed load / store.
1735 bool ARMTargetLowering::getPostIndexedAddressParts(SDNode *N, SDNode *Op,
1738 ISD::MemIndexedMode &AM,
1739 SelectionDAG &DAG) {
1740 if (Subtarget->isThumb())
1745 bool isSEXTLoad = false;
1746 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
1747 VT = LD->getMemoryVT();
1748 isSEXTLoad = LD->getExtensionType() == ISD::SEXTLOAD;
1749 } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
1750 VT = ST->getMemoryVT();
1755 bool isLegal = getIndexedAddressParts(Op, VT, isSEXTLoad, Base, Offset,
1758 AM = isInc ? ISD::POST_INC : ISD::POST_DEC;
1764 void ARMTargetLowering::computeMaskedBitsForTargetNode(const SDOperand Op,
1768 const SelectionDAG &DAG,
1769 unsigned Depth) const {
1770 KnownZero = KnownOne = APInt(Mask.getBitWidth(), 0);
1771 switch (Op.getOpcode()) {
1773 case ARMISD::CMOV: {
1774 // Bits are known zero/one if known on the LHS and RHS.
1775 DAG.ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero, KnownOne, Depth+1);
1776 if (KnownZero == 0 && KnownOne == 0) return;
1778 APInt KnownZeroRHS, KnownOneRHS;
1779 DAG.ComputeMaskedBits(Op.getOperand(1), Mask,
1780 KnownZeroRHS, KnownOneRHS, Depth+1);
1781 KnownZero &= KnownZeroRHS;
1782 KnownOne &= KnownOneRHS;
1788 //===----------------------------------------------------------------------===//
1789 // ARM Inline Assembly Support
1790 //===----------------------------------------------------------------------===//
1792 /// getConstraintType - Given a constraint letter, return the type of
1793 /// constraint it is for this target.
1794 ARMTargetLowering::ConstraintType
1795 ARMTargetLowering::getConstraintType(const std::string &Constraint) const {
1796 if (Constraint.size() == 1) {
1797 switch (Constraint[0]) {
1799 case 'l': return C_RegisterClass;
1800 case 'w': return C_RegisterClass;
1803 return TargetLowering::getConstraintType(Constraint);
1806 std::pair<unsigned, const TargetRegisterClass*>
1807 ARMTargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint,
1809 if (Constraint.size() == 1) {
1810 // GCC RS6000 Constraint Letters
1811 switch (Constraint[0]) {
1813 // FIXME: in thumb mode, 'l' is only low-regs.
1816 return std::make_pair(0U, ARM::GPRRegisterClass);
1819 return std::make_pair(0U, ARM::SPRRegisterClass);
1821 return std::make_pair(0U, ARM::DPRRegisterClass);
1825 return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
1828 std::vector<unsigned> ARMTargetLowering::
1829 getRegClassForInlineAsmConstraint(const std::string &Constraint,
1831 if (Constraint.size() != 1)
1832 return std::vector<unsigned>();
1834 switch (Constraint[0]) { // GCC ARM Constraint Letters
1838 return make_vector<unsigned>(ARM::R0, ARM::R1, ARM::R2, ARM::R3,
1839 ARM::R4, ARM::R5, ARM::R6, ARM::R7,
1840 ARM::R8, ARM::R9, ARM::R10, ARM::R11,
1841 ARM::R12, ARM::LR, 0);
1844 return make_vector<unsigned>(ARM::S0, ARM::S1, ARM::S2, ARM::S3,
1845 ARM::S4, ARM::S5, ARM::S6, ARM::S7,
1846 ARM::S8, ARM::S9, ARM::S10, ARM::S11,
1847 ARM::S12,ARM::S13,ARM::S14,ARM::S15,
1848 ARM::S16,ARM::S17,ARM::S18,ARM::S19,
1849 ARM::S20,ARM::S21,ARM::S22,ARM::S23,
1850 ARM::S24,ARM::S25,ARM::S26,ARM::S27,
1851 ARM::S28,ARM::S29,ARM::S30,ARM::S31, 0);
1853 return make_vector<unsigned>(ARM::D0, ARM::D1, ARM::D2, ARM::D3,
1854 ARM::D4, ARM::D5, ARM::D6, ARM::D7,
1855 ARM::D8, ARM::D9, ARM::D10,ARM::D11,
1856 ARM::D12,ARM::D13,ARM::D14,ARM::D15, 0);
1860 return std::vector<unsigned>();