1 //===-- AutoUpgrade.cpp - Implement auto-upgrade helper functions ---------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements the auto-upgrade helper functions
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "llvm/IR/AutoUpgrade.h"
15 #include "llvm/IR/CFG.h"
16 #include "llvm/IR/CallSite.h"
17 #include "llvm/IR/Constants.h"
18 #include "llvm/IR/DIBuilder.h"
19 #include "llvm/IR/DebugInfo.h"
20 #include "llvm/IR/DiagnosticInfo.h"
21 #include "llvm/IR/Function.h"
22 #include "llvm/IR/IRBuilder.h"
23 #include "llvm/IR/Instruction.h"
24 #include "llvm/IR/IntrinsicInst.h"
25 #include "llvm/IR/LLVMContext.h"
26 #include "llvm/IR/Module.h"
27 #include "llvm/Support/ErrorHandling.h"
28 #include <cstring>
29 using namespace llvm;
30
31 // Upgrade the declarations of the SSE4.1 functions whose arguments have
32 // changed their type from v4f32 to v2i64.
UpgradeSSE41Function(Function * F,Intrinsic::ID IID,Function * & NewFn)33 static bool UpgradeSSE41Function(Function* F, Intrinsic::ID IID,
34 Function *&NewFn) {
35 // Check whether this is an old version of the function, which received
36 // v4f32 arguments.
37 Type *Arg0Type = F->getFunctionType()->getParamType(0);
38 if (Arg0Type != VectorType::get(Type::getFloatTy(F->getContext()), 4))
39 return false;
40
41 // Yes, it's old, replace it with new version.
42 F->setName(F->getName() + ".old");
43 NewFn = Intrinsic::getDeclaration(F->getParent(), IID);
44 return true;
45 }
46
47 // Upgrade the declarations of intrinsic functions whose 8-bit immediate mask
48 // arguments have changed their type from i32 to i8.
UpgradeX86IntrinsicsWith8BitMask(Function * F,Intrinsic::ID IID,Function * & NewFn)49 static bool UpgradeX86IntrinsicsWith8BitMask(Function *F, Intrinsic::ID IID,
50 Function *&NewFn) {
51 // Check that the last argument is an i32.
52 Type *LastArgType = F->getFunctionType()->getParamType(
53 F->getFunctionType()->getNumParams() - 1);
54 if (!LastArgType->isIntegerTy(32))
55 return false;
56
57 // Move this function aside and map down.
58 F->setName(F->getName() + ".old");
59 NewFn = Intrinsic::getDeclaration(F->getParent(), IID);
60 return true;
61 }
62
UpgradeIntrinsicFunction1(Function * F,Function * & NewFn)63 static bool UpgradeIntrinsicFunction1(Function *F, Function *&NewFn) {
64 assert(F && "Illegal to upgrade a non-existent Function.");
65
66 // Quickly eliminate it, if it's not a candidate.
67 StringRef Name = F->getName();
68 if (Name.size() <= 8 || !Name.startswith("llvm."))
69 return false;
70 Name = Name.substr(5); // Strip off "llvm."
71
72 switch (Name[0]) {
73 default: break;
74 case 'a': {
75 if (Name.startswith("arm.neon.vclz")) {
76 Type* args[2] = {
77 F->arg_begin()->getType(),
78 Type::getInt1Ty(F->getContext())
79 };
80 // Can't use Intrinsic::getDeclaration here as it adds a ".i1" to
81 // the end of the name. Change name from llvm.arm.neon.vclz.* to
82 // llvm.ctlz.*
83 FunctionType* fType = FunctionType::get(F->getReturnType(), args, false);
84 NewFn = Function::Create(fType, F->getLinkage(),
85 "llvm.ctlz." + Name.substr(14), F->getParent());
86 return true;
87 }
88 if (Name.startswith("arm.neon.vcnt")) {
89 NewFn = Intrinsic::getDeclaration(F->getParent(), Intrinsic::ctpop,
90 F->arg_begin()->getType());
91 return true;
92 }
93 break;
94 }
95 case 'c': {
96 if (Name.startswith("ctlz.") && F->arg_size() == 1) {
97 F->setName(Name + ".old");
98 NewFn = Intrinsic::getDeclaration(F->getParent(), Intrinsic::ctlz,
99 F->arg_begin()->getType());
100 return true;
101 }
102 if (Name.startswith("cttz.") && F->arg_size() == 1) {
103 F->setName(Name + ".old");
104 NewFn = Intrinsic::getDeclaration(F->getParent(), Intrinsic::cttz,
105 F->arg_begin()->getType());
106 return true;
107 }
108 break;
109 }
110 case 'd': {
111 if (Name.startswith("dbg.declare") && F->arg_size() == 2) {
112 F->setName(Name + ".old");
113 NewFn = Intrinsic::getDeclaration(F->getParent(), Intrinsic::dbg_declare);
114 return true;
115 }
116 if (Name.startswith("dbg.value") && F->arg_size() == 3) {
117 F->setName(Name + ".old");
118 NewFn = Intrinsic::getDeclaration(F->getParent(), Intrinsic::dbg_value);
119 return true;
120 }
121 break;
122 }
123
124 case 'o':
125 // We only need to change the name to match the mangling including the
126 // address space.
127 if (F->arg_size() == 2 && Name.startswith("objectsize.")) {
128 Type *Tys[2] = { F->getReturnType(), F->arg_begin()->getType() };
129 if (F->getName() != Intrinsic::getName(Intrinsic::objectsize, Tys)) {
130 F->setName(Name + ".old");
131 NewFn = Intrinsic::getDeclaration(F->getParent(),
132 Intrinsic::objectsize, Tys);
133 return true;
134 }
135 }
136 break;
137
138 case 'x': {
139 if (Name.startswith("x86.sse2.pcmpeq.") ||
140 Name.startswith("x86.sse2.pcmpgt.") ||
141 Name.startswith("x86.avx2.pcmpeq.") ||
142 Name.startswith("x86.avx2.pcmpgt.") ||
143 Name.startswith("x86.avx.vpermil.") ||
144 Name == "x86.avx.movnt.dq.256" ||
145 Name == "x86.avx.movnt.pd.256" ||
146 Name == "x86.avx.movnt.ps.256" ||
147 Name == "x86.sse42.crc32.64.8" ||
148 Name == "x86.avx.vbroadcast.ss" ||
149 Name == "x86.avx.vbroadcast.ss.256" ||
150 Name == "x86.avx.vbroadcast.sd.256" ||
151 (Name.startswith("x86.xop.vpcom") && F->arg_size() == 2)) {
152 NewFn = nullptr;
153 return true;
154 }
155 // SSE4.1 ptest functions may have an old signature.
156 if (Name.startswith("x86.sse41.ptest")) {
157 if (Name == "x86.sse41.ptestc")
158 return UpgradeSSE41Function(F, Intrinsic::x86_sse41_ptestc, NewFn);
159 if (Name == "x86.sse41.ptestz")
160 return UpgradeSSE41Function(F, Intrinsic::x86_sse41_ptestz, NewFn);
161 if (Name == "x86.sse41.ptestnzc")
162 return UpgradeSSE41Function(F, Intrinsic::x86_sse41_ptestnzc, NewFn);
163 }
164 // Several blend and other instructions with maskes used the wrong number of
165 // bits.
166 if (Name == "x86.sse41.pblendw")
167 return UpgradeX86IntrinsicsWith8BitMask(F, Intrinsic::x86_sse41_pblendw,
168 NewFn);
169 if (Name == "x86.sse41.blendpd")
170 return UpgradeX86IntrinsicsWith8BitMask(F, Intrinsic::x86_sse41_blendpd,
171 NewFn);
172 if (Name == "x86.sse41.blendps")
173 return UpgradeX86IntrinsicsWith8BitMask(F, Intrinsic::x86_sse41_blendps,
174 NewFn);
175 if (Name == "x86.sse41.insertps")
176 return UpgradeX86IntrinsicsWith8BitMask(F, Intrinsic::x86_sse41_insertps,
177 NewFn);
178 if (Name == "x86.sse41.dppd")
179 return UpgradeX86IntrinsicsWith8BitMask(F, Intrinsic::x86_sse41_dppd,
180 NewFn);
181 if (Name == "x86.sse41.dpps")
182 return UpgradeX86IntrinsicsWith8BitMask(F, Intrinsic::x86_sse41_dpps,
183 NewFn);
184 if (Name == "x86.sse41.mpsadbw")
185 return UpgradeX86IntrinsicsWith8BitMask(F, Intrinsic::x86_sse41_mpsadbw,
186 NewFn);
187 if (Name == "x86.avx.blend.pd.256")
188 return UpgradeX86IntrinsicsWith8BitMask(
189 F, Intrinsic::x86_avx_blend_pd_256, NewFn);
190 if (Name == "x86.avx.blend.ps.256")
191 return UpgradeX86IntrinsicsWith8BitMask(
192 F, Intrinsic::x86_avx_blend_ps_256, NewFn);
193 if (Name == "x86.avx.dp.ps.256")
194 return UpgradeX86IntrinsicsWith8BitMask(F, Intrinsic::x86_avx_dp_ps_256,
195 NewFn);
196 if (Name == "x86.avx2.pblendw")
197 return UpgradeX86IntrinsicsWith8BitMask(F, Intrinsic::x86_avx2_pblendw,
198 NewFn);
199 if (Name == "x86.avx2.pblendd.128")
200 return UpgradeX86IntrinsicsWith8BitMask(
201 F, Intrinsic::x86_avx2_pblendd_128, NewFn);
202 if (Name == "x86.avx2.pblendd.256")
203 return UpgradeX86IntrinsicsWith8BitMask(
204 F, Intrinsic::x86_avx2_pblendd_256, NewFn);
205 if (Name == "x86.avx2.mpsadbw")
206 return UpgradeX86IntrinsicsWith8BitMask(F, Intrinsic::x86_avx2_mpsadbw,
207 NewFn);
208
209 // frcz.ss/sd may need to have an argument dropped
210 if (Name.startswith("x86.xop.vfrcz.ss") && F->arg_size() == 2) {
211 F->setName(Name + ".old");
212 NewFn = Intrinsic::getDeclaration(F->getParent(),
213 Intrinsic::x86_xop_vfrcz_ss);
214 return true;
215 }
216 if (Name.startswith("x86.xop.vfrcz.sd") && F->arg_size() == 2) {
217 F->setName(Name + ".old");
218 NewFn = Intrinsic::getDeclaration(F->getParent(),
219 Intrinsic::x86_xop_vfrcz_sd);
220 return true;
221 }
222 // Fix the FMA4 intrinsics to remove the 4
223 if (Name.startswith("x86.fma4.")) {
224 F->setName("llvm.x86.fma" + Name.substr(8));
225 NewFn = F;
226 return true;
227 }
228 break;
229 }
230 }
231
232 // This may not belong here. This function is effectively being overloaded
233 // to both detect an intrinsic which needs upgrading, and to provide the
234 // upgraded form of the intrinsic. We should perhaps have two separate
235 // functions for this.
236 return false;
237 }
238
UpgradeIntrinsicFunction(Function * F,Function * & NewFn)239 bool llvm::UpgradeIntrinsicFunction(Function *F, Function *&NewFn) {
240 NewFn = nullptr;
241 bool Upgraded = UpgradeIntrinsicFunction1(F, NewFn);
242
243 // Upgrade intrinsic attributes. This does not change the function.
244 if (NewFn)
245 F = NewFn;
246 if (unsigned id = F->getIntrinsicID())
247 F->setAttributes(Intrinsic::getAttributes(F->getContext(),
248 (Intrinsic::ID)id));
249 return Upgraded;
250 }
251
UpgradeGlobalVariable(GlobalVariable * GV)252 bool llvm::UpgradeGlobalVariable(GlobalVariable *GV) {
253 // Nothing to do yet.
254 return false;
255 }
256
getNodeField(const MDNode * DbgNode,unsigned Elt)257 static MDNode *getNodeField(const MDNode *DbgNode, unsigned Elt) {
258 if (!DbgNode || Elt >= DbgNode->getNumOperands())
259 return nullptr;
260 return dyn_cast_or_null<MDNode>(DbgNode->getOperand(Elt));
261 }
262
getExpression(Value * VarOperand,Function * F)263 static MetadataAsValue *getExpression(Value *VarOperand, Function *F) {
264 // Old-style DIVariables have an optional expression as the 8th element.
265 DIExpression Expr(getNodeField(
266 cast<MDNode>(cast<MetadataAsValue>(VarOperand)->getMetadata()), 8));
267 if (!Expr) {
268 DIBuilder DIB(*F->getParent(), /*AllowUnresolved*/ false);
269 Expr = DIB.createExpression();
270 }
271 return MetadataAsValue::get(F->getContext(), Expr);
272 }
273
274 // UpgradeIntrinsicCall - Upgrade a call to an old intrinsic to be a call the
275 // upgraded intrinsic. All argument and return casting must be provided in
276 // order to seamlessly integrate with existing context.
UpgradeIntrinsicCall(CallInst * CI,Function * NewFn)277 void llvm::UpgradeIntrinsicCall(CallInst *CI, Function *NewFn) {
278 Function *F = CI->getCalledFunction();
279 LLVMContext &C = CI->getContext();
280 IRBuilder<> Builder(C);
281 Builder.SetInsertPoint(CI->getParent(), CI);
282
283 assert(F && "Intrinsic call is not direct?");
284
285 if (!NewFn) {
286 // Get the Function's name.
287 StringRef Name = F->getName();
288
289 Value *Rep;
290 // Upgrade packed integer vector compares intrinsics to compare instructions
291 if (Name.startswith("llvm.x86.sse2.pcmpeq.") ||
292 Name.startswith("llvm.x86.avx2.pcmpeq.")) {
293 Rep = Builder.CreateICmpEQ(CI->getArgOperand(0), CI->getArgOperand(1),
294 "pcmpeq");
295 // need to sign extend since icmp returns vector of i1
296 Rep = Builder.CreateSExt(Rep, CI->getType(), "");
297 } else if (Name.startswith("llvm.x86.sse2.pcmpgt.") ||
298 Name.startswith("llvm.x86.avx2.pcmpgt.")) {
299 Rep = Builder.CreateICmpSGT(CI->getArgOperand(0), CI->getArgOperand(1),
300 "pcmpgt");
301 // need to sign extend since icmp returns vector of i1
302 Rep = Builder.CreateSExt(Rep, CI->getType(), "");
303 } else if (Name == "llvm.x86.avx.movnt.dq.256" ||
304 Name == "llvm.x86.avx.movnt.ps.256" ||
305 Name == "llvm.x86.avx.movnt.pd.256") {
306 IRBuilder<> Builder(C);
307 Builder.SetInsertPoint(CI->getParent(), CI);
308
309 Module *M = F->getParent();
310 SmallVector<Metadata *, 1> Elts;
311 Elts.push_back(
312 ConstantAsMetadata::get(ConstantInt::get(Type::getInt32Ty(C), 1)));
313 MDNode *Node = MDNode::get(C, Elts);
314
315 Value *Arg0 = CI->getArgOperand(0);
316 Value *Arg1 = CI->getArgOperand(1);
317
318 // Convert the type of the pointer to a pointer to the stored type.
319 Value *BC = Builder.CreateBitCast(Arg0,
320 PointerType::getUnqual(Arg1->getType()),
321 "cast");
322 StoreInst *SI = Builder.CreateStore(Arg1, BC);
323 SI->setMetadata(M->getMDKindID("nontemporal"), Node);
324 SI->setAlignment(16);
325
326 // Remove intrinsic.
327 CI->eraseFromParent();
328 return;
329 } else if (Name.startswith("llvm.x86.xop.vpcom")) {
330 Intrinsic::ID intID;
331 if (Name.endswith("ub"))
332 intID = Intrinsic::x86_xop_vpcomub;
333 else if (Name.endswith("uw"))
334 intID = Intrinsic::x86_xop_vpcomuw;
335 else if (Name.endswith("ud"))
336 intID = Intrinsic::x86_xop_vpcomud;
337 else if (Name.endswith("uq"))
338 intID = Intrinsic::x86_xop_vpcomuq;
339 else if (Name.endswith("b"))
340 intID = Intrinsic::x86_xop_vpcomb;
341 else if (Name.endswith("w"))
342 intID = Intrinsic::x86_xop_vpcomw;
343 else if (Name.endswith("d"))
344 intID = Intrinsic::x86_xop_vpcomd;
345 else if (Name.endswith("q"))
346 intID = Intrinsic::x86_xop_vpcomq;
347 else
348 llvm_unreachable("Unknown suffix");
349
350 Name = Name.substr(18); // strip off "llvm.x86.xop.vpcom"
351 unsigned Imm;
352 if (Name.startswith("lt"))
353 Imm = 0;
354 else if (Name.startswith("le"))
355 Imm = 1;
356 else if (Name.startswith("gt"))
357 Imm = 2;
358 else if (Name.startswith("ge"))
359 Imm = 3;
360 else if (Name.startswith("eq"))
361 Imm = 4;
362 else if (Name.startswith("ne"))
363 Imm = 5;
364 else if (Name.startswith("true"))
365 Imm = 6;
366 else if (Name.startswith("false"))
367 Imm = 7;
368 else
369 llvm_unreachable("Unknown condition");
370
371 Function *VPCOM = Intrinsic::getDeclaration(F->getParent(), intID);
372 Rep = Builder.CreateCall3(VPCOM, CI->getArgOperand(0),
373 CI->getArgOperand(1), Builder.getInt8(Imm));
374 } else if (Name == "llvm.x86.sse42.crc32.64.8") {
375 Function *CRC32 = Intrinsic::getDeclaration(F->getParent(),
376 Intrinsic::x86_sse42_crc32_32_8);
377 Value *Trunc0 = Builder.CreateTrunc(CI->getArgOperand(0), Type::getInt32Ty(C));
378 Rep = Builder.CreateCall2(CRC32, Trunc0, CI->getArgOperand(1));
379 Rep = Builder.CreateZExt(Rep, CI->getType(), "");
380 } else if (Name.startswith("llvm.x86.avx.vbroadcast")) {
381 // Replace broadcasts with a series of insertelements.
382 Type *VecTy = CI->getType();
383 Type *EltTy = VecTy->getVectorElementType();
384 unsigned EltNum = VecTy->getVectorNumElements();
385 Value *Cast = Builder.CreateBitCast(CI->getArgOperand(0),
386 EltTy->getPointerTo());
387 Value *Load = Builder.CreateLoad(Cast);
388 Type *I32Ty = Type::getInt32Ty(C);
389 Rep = UndefValue::get(VecTy);
390 for (unsigned I = 0; I < EltNum; ++I)
391 Rep = Builder.CreateInsertElement(Rep, Load,
392 ConstantInt::get(I32Ty, I));
393 } else {
394 bool PD128 = false, PD256 = false, PS128 = false, PS256 = false;
395 if (Name == "llvm.x86.avx.vpermil.pd.256")
396 PD256 = true;
397 else if (Name == "llvm.x86.avx.vpermil.pd")
398 PD128 = true;
399 else if (Name == "llvm.x86.avx.vpermil.ps.256")
400 PS256 = true;
401 else if (Name == "llvm.x86.avx.vpermil.ps")
402 PS128 = true;
403
404 if (PD256 || PD128 || PS256 || PS128) {
405 Value *Op0 = CI->getArgOperand(0);
406 unsigned Imm = cast<ConstantInt>(CI->getArgOperand(1))->getZExtValue();
407 SmallVector<Constant*, 8> Idxs;
408
409 if (PD128)
410 for (unsigned i = 0; i != 2; ++i)
411 Idxs.push_back(Builder.getInt32((Imm >> i) & 0x1));
412 else if (PD256)
413 for (unsigned l = 0; l != 4; l+=2)
414 for (unsigned i = 0; i != 2; ++i)
415 Idxs.push_back(Builder.getInt32(((Imm >> (l+i)) & 0x1) + l));
416 else if (PS128)
417 for (unsigned i = 0; i != 4; ++i)
418 Idxs.push_back(Builder.getInt32((Imm >> (2 * i)) & 0x3));
419 else if (PS256)
420 for (unsigned l = 0; l != 8; l+=4)
421 for (unsigned i = 0; i != 4; ++i)
422 Idxs.push_back(Builder.getInt32(((Imm >> (2 * i)) & 0x3) + l));
423 else
424 llvm_unreachable("Unexpected function");
425
426 Rep = Builder.CreateShuffleVector(Op0, Op0, ConstantVector::get(Idxs));
427 } else {
428 llvm_unreachable("Unknown function for CallInst upgrade.");
429 }
430 }
431
432 CI->replaceAllUsesWith(Rep);
433 CI->eraseFromParent();
434 return;
435 }
436
437 std::string Name = CI->getName().str();
438 if (!Name.empty())
439 CI->setName(Name + ".old");
440
441 switch (NewFn->getIntrinsicID()) {
442 default:
443 llvm_unreachable("Unknown function for CallInst upgrade.");
444
445 // Upgrade debug intrinsics to use an additional DIExpression argument.
446 case Intrinsic::dbg_declare: {
447 auto NewCI =
448 Builder.CreateCall3(NewFn, CI->getArgOperand(0), CI->getArgOperand(1),
449 getExpression(CI->getArgOperand(1), F), Name);
450 NewCI->setDebugLoc(CI->getDebugLoc());
451 CI->replaceAllUsesWith(NewCI);
452 CI->eraseFromParent();
453 return;
454 }
455 case Intrinsic::dbg_value: {
456 auto NewCI = Builder.CreateCall4(
457 NewFn, CI->getArgOperand(0), CI->getArgOperand(1), CI->getArgOperand(2),
458 getExpression(CI->getArgOperand(2), F), Name);
459 NewCI->setDebugLoc(CI->getDebugLoc());
460 CI->replaceAllUsesWith(NewCI);
461 CI->eraseFromParent();
462 return;
463 }
464 case Intrinsic::ctlz:
465 case Intrinsic::cttz:
466 assert(CI->getNumArgOperands() == 1 &&
467 "Mismatch between function args and call args");
468 CI->replaceAllUsesWith(Builder.CreateCall2(NewFn, CI->getArgOperand(0),
469 Builder.getFalse(), Name));
470 CI->eraseFromParent();
471 return;
472
473 case Intrinsic::objectsize:
474 CI->replaceAllUsesWith(Builder.CreateCall2(NewFn,
475 CI->getArgOperand(0),
476 CI->getArgOperand(1),
477 Name));
478 CI->eraseFromParent();
479 return;
480
481 case Intrinsic::ctpop: {
482 CI->replaceAllUsesWith(Builder.CreateCall(NewFn, CI->getArgOperand(0)));
483 CI->eraseFromParent();
484 return;
485 }
486
487 case Intrinsic::x86_xop_vfrcz_ss:
488 case Intrinsic::x86_xop_vfrcz_sd:
489 CI->replaceAllUsesWith(Builder.CreateCall(NewFn, CI->getArgOperand(1),
490 Name));
491 CI->eraseFromParent();
492 return;
493
494 case Intrinsic::x86_sse41_ptestc:
495 case Intrinsic::x86_sse41_ptestz:
496 case Intrinsic::x86_sse41_ptestnzc: {
497 // The arguments for these intrinsics used to be v4f32, and changed
498 // to v2i64. This is purely a nop, since those are bitwise intrinsics.
499 // So, the only thing required is a bitcast for both arguments.
500 // First, check the arguments have the old type.
501 Value *Arg0 = CI->getArgOperand(0);
502 if (Arg0->getType() != VectorType::get(Type::getFloatTy(C), 4))
503 return;
504
505 // Old intrinsic, add bitcasts
506 Value *Arg1 = CI->getArgOperand(1);
507
508 Value *BC0 =
509 Builder.CreateBitCast(Arg0,
510 VectorType::get(Type::getInt64Ty(C), 2),
511 "cast");
512 Value *BC1 =
513 Builder.CreateBitCast(Arg1,
514 VectorType::get(Type::getInt64Ty(C), 2),
515 "cast");
516
517 CallInst* NewCall = Builder.CreateCall2(NewFn, BC0, BC1, Name);
518 CI->replaceAllUsesWith(NewCall);
519 CI->eraseFromParent();
520 return;
521 }
522
523 case Intrinsic::x86_sse41_pblendw:
524 case Intrinsic::x86_sse41_blendpd:
525 case Intrinsic::x86_sse41_blendps:
526 case Intrinsic::x86_sse41_insertps:
527 case Intrinsic::x86_sse41_dppd:
528 case Intrinsic::x86_sse41_dpps:
529 case Intrinsic::x86_sse41_mpsadbw:
530 case Intrinsic::x86_avx_blend_pd_256:
531 case Intrinsic::x86_avx_blend_ps_256:
532 case Intrinsic::x86_avx_dp_ps_256:
533 case Intrinsic::x86_avx2_pblendw:
534 case Intrinsic::x86_avx2_pblendd_128:
535 case Intrinsic::x86_avx2_pblendd_256:
536 case Intrinsic::x86_avx2_mpsadbw: {
537 // Need to truncate the last argument from i32 to i8 -- this argument models
538 // an inherently 8-bit immediate operand to these x86 instructions.
539 SmallVector<Value *, 4> Args(CI->arg_operands().begin(),
540 CI->arg_operands().end());
541
542 // Replace the last argument with a trunc.
543 Args.back() = Builder.CreateTrunc(Args.back(), Type::getInt8Ty(C), "trunc");
544
545 CallInst *NewCall = Builder.CreateCall(NewFn, Args);
546 CI->replaceAllUsesWith(NewCall);
547 CI->eraseFromParent();
548 return;
549 }
550 }
551 }
552
553 // This tests each Function to determine if it needs upgrading. When we find
554 // one we are interested in, we then upgrade all calls to reflect the new
555 // function.
UpgradeCallsToIntrinsic(Function * F)556 void llvm::UpgradeCallsToIntrinsic(Function* F) {
557 assert(F && "Illegal attempt to upgrade a non-existent intrinsic.");
558
559 // Upgrade the function and check if it is a totaly new function.
560 Function *NewFn;
561 if (UpgradeIntrinsicFunction(F, NewFn)) {
562 if (NewFn != F) {
563 // Replace all uses to the old function with the new one if necessary.
564 for (Value::user_iterator UI = F->user_begin(), UE = F->user_end();
565 UI != UE; ) {
566 if (CallInst *CI = dyn_cast<CallInst>(*UI++))
567 UpgradeIntrinsicCall(CI, NewFn);
568 }
569 // Remove old function, no longer used, from the module.
570 F->eraseFromParent();
571 }
572 }
573 }
574
UpgradeInstWithTBAATag(Instruction * I)575 void llvm::UpgradeInstWithTBAATag(Instruction *I) {
576 MDNode *MD = I->getMetadata(LLVMContext::MD_tbaa);
577 assert(MD && "UpgradeInstWithTBAATag should have a TBAA tag");
578 // Check if the tag uses struct-path aware TBAA format.
579 if (isa<MDNode>(MD->getOperand(0)) && MD->getNumOperands() >= 3)
580 return;
581
582 if (MD->getNumOperands() == 3) {
583 Metadata *Elts[] = {MD->getOperand(0), MD->getOperand(1)};
584 MDNode *ScalarType = MDNode::get(I->getContext(), Elts);
585 // Create a MDNode <ScalarType, ScalarType, offset 0, const>
586 Metadata *Elts2[] = {ScalarType, ScalarType,
587 ConstantAsMetadata::get(Constant::getNullValue(
588 Type::getInt64Ty(I->getContext()))),
589 MD->getOperand(2)};
590 I->setMetadata(LLVMContext::MD_tbaa, MDNode::get(I->getContext(), Elts2));
591 } else {
592 // Create a MDNode <MD, MD, offset 0>
593 Metadata *Elts[] = {MD, MD, ConstantAsMetadata::get(Constant::getNullValue(
594 Type::getInt64Ty(I->getContext())))};
595 I->setMetadata(LLVMContext::MD_tbaa, MDNode::get(I->getContext(), Elts));
596 }
597 }
598
UpgradeBitCastInst(unsigned Opc,Value * V,Type * DestTy,Instruction * & Temp)599 Instruction *llvm::UpgradeBitCastInst(unsigned Opc, Value *V, Type *DestTy,
600 Instruction *&Temp) {
601 if (Opc != Instruction::BitCast)
602 return nullptr;
603
604 Temp = nullptr;
605 Type *SrcTy = V->getType();
606 if (SrcTy->isPtrOrPtrVectorTy() && DestTy->isPtrOrPtrVectorTy() &&
607 SrcTy->getPointerAddressSpace() != DestTy->getPointerAddressSpace()) {
608 LLVMContext &Context = V->getContext();
609
610 // We have no information about target data layout, so we assume that
611 // the maximum pointer size is 64bit.
612 Type *MidTy = Type::getInt64Ty(Context);
613 Temp = CastInst::Create(Instruction::PtrToInt, V, MidTy);
614
615 return CastInst::Create(Instruction::IntToPtr, Temp, DestTy);
616 }
617
618 return nullptr;
619 }
620
UpgradeBitCastExpr(unsigned Opc,Constant * C,Type * DestTy)621 Value *llvm::UpgradeBitCastExpr(unsigned Opc, Constant *C, Type *DestTy) {
622 if (Opc != Instruction::BitCast)
623 return nullptr;
624
625 Type *SrcTy = C->getType();
626 if (SrcTy->isPtrOrPtrVectorTy() && DestTy->isPtrOrPtrVectorTy() &&
627 SrcTy->getPointerAddressSpace() != DestTy->getPointerAddressSpace()) {
628 LLVMContext &Context = C->getContext();
629
630 // We have no information about target data layout, so we assume that
631 // the maximum pointer size is 64bit.
632 Type *MidTy = Type::getInt64Ty(Context);
633
634 return ConstantExpr::getIntToPtr(ConstantExpr::getPtrToInt(C, MidTy),
635 DestTy);
636 }
637
638 return nullptr;
639 }
640
641 /// Check the debug info version number, if it is out-dated, drop the debug
642 /// info. Return true if module is modified.
UpgradeDebugInfo(Module & M)643 bool llvm::UpgradeDebugInfo(Module &M) {
644 unsigned Version = getDebugMetadataVersionFromModule(M);
645 if (Version == DEBUG_METADATA_VERSION)
646 return false;
647
648 bool RetCode = StripDebugInfo(M);
649 if (RetCode) {
650 DiagnosticInfoDebugMetadataVersion DiagVersion(M, Version);
651 M.getContext().diagnose(DiagVersion);
652 }
653 return RetCode;
654 }
655
UpgradeMDStringConstant(std::string & String)656 void llvm::UpgradeMDStringConstant(std::string &String) {
657 const std::string OldPrefix = "llvm.vectorizer.";
658 if (String == "llvm.vectorizer.unroll") {
659 String = "llvm.loop.interleave.count";
660 } else if (String.find(OldPrefix) == 0) {
661 String.replace(0, OldPrefix.size(), "llvm.loop.vectorize.");
662 }
663 }
664