lib/IR/AutoUpgrade.cpp

   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.
  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.
  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
  63 // Upgrade the declarations of AVX-512 cmp intrinsic functions whose 8-bit
  64 // immediates have changed their type from i32 to i8.
  65 static bool UpgradeAVX512CmpIntrinsic(Function *F, Intrinsic::ID IID,
  66                                       Function *&NewFn) {
  67   // Check that the last argument is an i32.
  68   Type *LastArgType = F->getFunctionType()->getParamType(2);
  69   if (!LastArgType->isIntegerTy(32))
  70     return false;
  71
  72   // Move this function aside and map down.
  73   F->setName(F->getName() + ".old");
  74   NewFn = Intrinsic::getDeclaration(F->getParent(), IID);
  75   return true;
  76 }
  77
  78 static bool UpgradeIntrinsicFunction1(Function *F, Function *&NewFn) {
  79   assert(F && "Illegal to upgrade a non-existent Function.");
  80
  81   // Quickly eliminate it, if it's not a candidate.
  82   StringRef Name = F->getName();
  83   if (Name.size() <= 8 || !Name.startswith("llvm."))
  84     return false;
  85   Name = Name.substr(5); // Strip off "llvm."
  86
  87   switch (Name[0]) {
  88   default: break;
  89   case 'a': {
  90     if (Name.startswith("arm.neon.vclz")) {
  91       Type* args[2] = {
  92         F->arg_begin()->getType(),
  93         Type::getInt1Ty(F->getContext())
  94       };
  95       // Can't use Intrinsic::getDeclaration here as it adds a ".i1" to
  96       // the end of the name. Change name from llvm.arm.neon.vclz.* to
  97       //  llvm.ctlz.*
  98       FunctionType* fType = FunctionType::get(F->getReturnType(), args, false);
  99       NewFn = Function::Create(fType, F->getLinkage(),
 100                                "llvm.ctlz." + Name.substr(14), F->getParent());
 101       return true;
 102     }
 103     if (Name.startswith("arm.neon.vcnt")) {
 104       NewFn = Intrinsic::getDeclaration(F->getParent(), Intrinsic::ctpop,
 105                                         F->arg_begin()->getType());
 106       return true;
 107     }
 108     break;
 109   }
 110   case 'c': {
 111     if (Name.startswith("ctlz.") && F->arg_size() == 1) {
 112       F->setName(Name + ".old");
 113       NewFn = Intrinsic::getDeclaration(F->getParent(), Intrinsic::ctlz,
 114                                         F->arg_begin()->getType());
 115       return true;
 116     }
 117     if (Name.startswith("cttz.") && F->arg_size() == 1) {
 118       F->setName(Name + ".old");
 119       NewFn = Intrinsic::getDeclaration(F->getParent(), Intrinsic::cttz,
 120                                         F->arg_begin()->getType());
 121       return true;
 122     }
 123     break;
 124   }
 125   case 'd': {
 126     if (Name.startswith("dbg.declare") && F->arg_size() == 2) {
 127       F->setName(Name + ".old");
 128       NewFn = Intrinsic::getDeclaration(F->getParent(), Intrinsic::dbg_declare);
 129       return true;
 130     }
 131     if (Name.startswith("dbg.value") && F->arg_size() == 3) {
 132       F->setName(Name + ".old");
 133       NewFn = Intrinsic::getDeclaration(F->getParent(), Intrinsic::dbg_value);
 134       return true;
 135     }
 136     break;
 137   }
 138
 139   case 'o':
 140     // We only need to change the name to match the mangling including the
 141     // address space.
 142     if (F->arg_size() == 2 && Name.startswith("objectsize.")) {
 143       Type *Tys[2] = { F->getReturnType(), F->arg_begin()->getType() };
 144       if (F->getName() != Intrinsic::getName(Intrinsic::objectsize, Tys)) {
 145         F->setName(Name + ".old");
 146         NewFn = Intrinsic::getDeclaration(F->getParent(),
 147                                           Intrinsic::objectsize, Tys);
 148         return true;
 149       }
 150     }
 151     break;
 152
 153   case 'x': {
 154     if (Name.startswith("x86.sse2.pcmpeq.") ||
 155         Name.startswith("x86.sse2.pcmpgt.") ||
 156         Name.startswith("x86.avx2.pcmpeq.") ||
 157         Name.startswith("x86.avx2.pcmpgt.") ||
 158         Name.startswith("x86.avx.vpermil.") ||
 159         Name == "x86.avx.movnt.dq.256" ||
 160         Name == "x86.avx.movnt.pd.256" ||
 161         Name == "x86.avx.movnt.ps.256" ||
 162         Name == "x86.sse42.crc32.64.8" ||
 163         Name == "x86.avx.vbroadcast.ss" ||
 164         Name == "x86.avx.vbroadcast.ss.256" ||
 165         Name == "x86.avx.vbroadcast.sd.256" ||
 166         (Name.startswith("x86.xop.vpcom") && F->arg_size() == 2)) {
 167       NewFn = nullptr;
 168       return true;
 169     }
 170     // SSE4.1 ptest functions may have an old signature.
 171     if (Name.startswith("x86.sse41.ptest")) {
 172       if (Name == "x86.sse41.ptestc")
 173         return UpgradeSSE41Function(F, Intrinsic::x86_sse41_ptestc, NewFn);
 174       if (Name == "x86.sse41.ptestz")
 175         return UpgradeSSE41Function(F, Intrinsic::x86_sse41_ptestz, NewFn);
 176       if (Name == "x86.sse41.ptestnzc")
 177         return UpgradeSSE41Function(F, Intrinsic::x86_sse41_ptestnzc, NewFn);
 178     }
 179     // Several blend and other instructions with maskes used the wrong number of
 180     // bits.
 181     if (Name == "x86.sse41.pblendw")
 182       return UpgradeX86IntrinsicsWith8BitMask(F, Intrinsic::x86_sse41_pblendw,
 183                                               NewFn);
 184     if (Name == "x86.sse41.blendpd")
 185       return UpgradeX86IntrinsicsWith8BitMask(F, Intrinsic::x86_sse41_blendpd,
 186                                               NewFn);
 187     if (Name == "x86.sse41.blendps")
 188       return UpgradeX86IntrinsicsWith8BitMask(F, Intrinsic::x86_sse41_blendps,
 189                                               NewFn);
 190     if (Name == "x86.sse41.insertps")
 191       return UpgradeX86IntrinsicsWith8BitMask(F, Intrinsic::x86_sse41_insertps,
 192                                               NewFn);
 193     if (Name == "x86.sse41.dppd")
 194       return UpgradeX86IntrinsicsWith8BitMask(F, Intrinsic::x86_sse41_dppd,
 195                                               NewFn);
 196     if (Name == "x86.sse41.dpps")
 197       return UpgradeX86IntrinsicsWith8BitMask(F, Intrinsic::x86_sse41_dpps,
 198                                               NewFn);
 199     if (Name == "x86.sse41.mpsadbw")
 200       return UpgradeX86IntrinsicsWith8BitMask(F, Intrinsic::x86_sse41_mpsadbw,
 201                                               NewFn);
 202     if (Name == "x86.avx.blend.pd.256")
 203       return UpgradeX86IntrinsicsWith8BitMask(
 204           F, Intrinsic::x86_avx_blend_pd_256, NewFn);
 205     if (Name == "x86.avx.blend.ps.256")
 206       return UpgradeX86IntrinsicsWith8BitMask(
 207           F, Intrinsic::x86_avx_blend_ps_256, NewFn);
 208     if (Name == "x86.avx.dp.ps.256")
 209       return UpgradeX86IntrinsicsWith8BitMask(F, Intrinsic::x86_avx_dp_ps_256,
 210                                               NewFn);
 211     if (Name == "x86.avx2.pblendw")
 212       return UpgradeX86IntrinsicsWith8BitMask(F, Intrinsic::x86_avx2_pblendw,
 213                                               NewFn);
 214     if (Name == "x86.avx2.pblendd.128")
 215       return UpgradeX86IntrinsicsWith8BitMask(
 216           F, Intrinsic::x86_avx2_pblendd_128, NewFn);
 217     if (Name == "x86.avx2.pblendd.256")
 218       return UpgradeX86IntrinsicsWith8BitMask(
 219           F, Intrinsic::x86_avx2_pblendd_256, NewFn);
 220     if (Name == "x86.avx2.mpsadbw")
 221       return UpgradeX86IntrinsicsWith8BitMask(F, Intrinsic::x86_avx2_mpsadbw,
 222                                               NewFn);
 223
 224     if (Name == "x86.avx512.mask.cmp.ps.512")
 225       return UpgradeAVX512CmpIntrinsic(F, Intrinsic::x86_avx512_mask_cmp_ps_512,
 226                                        NewFn);
 227     if (Name == "x86.avx512.mask.cmp.pd.512")
 228       return UpgradeAVX512CmpIntrinsic(F, Intrinsic::x86_avx512_mask_cmp_pd_512,
 229                                        NewFn);
 230
 231     if (Name == "x86.avx512.mask.cmp.b.512")
 232       return UpgradeAVX512CmpIntrinsic(F, Intrinsic::x86_avx512_mask_cmp_b_512,
 233                                        NewFn);
 234     if (Name == "x86.avx512.mask.cmp.w.512")
 235       return UpgradeAVX512CmpIntrinsic(F, Intrinsic::x86_avx512_mask_cmp_w_512,
 236                                        NewFn);
 237     if (Name == "x86.avx512.mask.cmp.d.512")
 238       return UpgradeAVX512CmpIntrinsic(F, Intrinsic::x86_avx512_mask_cmp_d_512,
 239                                        NewFn);
 240     if (Name == "x86.avx512.mask.cmp.q.512")
 241       return UpgradeAVX512CmpIntrinsic(F, Intrinsic::x86_avx512_mask_cmp_q_512,
 242                                        NewFn);
 243     if (Name == "x86.avx512.mask.ucmp.b.512")
 244       return UpgradeAVX512CmpIntrinsic(F, Intrinsic::x86_avx512_mask_ucmp_b_512,
 245                                        NewFn);
 246     if (Name == "x86.avx512.mask.ucmp.w.512")
 247       return UpgradeAVX512CmpIntrinsic(F, Intrinsic::x86_avx512_mask_ucmp_w_512,
 248                                        NewFn);
 249     if (Name == "x86.avx512.mask.ucmp.d.512")
 250       return UpgradeAVX512CmpIntrinsic(F, Intrinsic::x86_avx512_mask_ucmp_d_512,
 251                                        NewFn);
 252     if (Name == "x86.avx512.mask.ucmp.q.512")
 253       return UpgradeAVX512CmpIntrinsic(F, Intrinsic::x86_avx512_mask_ucmp_q_512,
 254                                        NewFn);
 255
 256     if (Name == "x86.avx512.mask.cmp.b.256")
 257       return UpgradeAVX512CmpIntrinsic(F, Intrinsic::x86_avx512_mask_cmp_b_256,
 258                                        NewFn);
 259     if (Name == "x86.avx512.mask.cmp.w.256")
 260       return UpgradeAVX512CmpIntrinsic(F, Intrinsic::x86_avx512_mask_cmp_w_256,
 261                                        NewFn);
 262     if (Name == "x86.avx512.mask.cmp.d.256")
 263       return UpgradeAVX512CmpIntrinsic(F, Intrinsic::x86_avx512_mask_cmp_d_256,
 264                                        NewFn);
 265     if (Name == "x86.avx512.mask.cmp.q.256")
 266       return UpgradeAVX512CmpIntrinsic(F, Intrinsic::x86_avx512_mask_cmp_q_256,
 267                                        NewFn);
 268     if (Name == "x86.avx512.mask.ucmp.b.256")
 269       return UpgradeAVX512CmpIntrinsic(F, Intrinsic::x86_avx512_mask_ucmp_b_256,
 270                                        NewFn);
 271     if (Name == "x86.avx512.mask.ucmp.w.256")
 272       return UpgradeAVX512CmpIntrinsic(F, Intrinsic::x86_avx512_mask_ucmp_w_256,
 273                                        NewFn);
 274     if (Name == "x86.avx512.mask.ucmp.d.256")
 275       return UpgradeAVX512CmpIntrinsic(F, Intrinsic::x86_avx512_mask_ucmp_d_256,
 276                                        NewFn);
 277     if (Name == "x86.avx512.mask.ucmp.q.256")
 278       return UpgradeAVX512CmpIntrinsic(F, Intrinsic::x86_avx512_mask_ucmp_q_256,
 279                                        NewFn);
 280
 281     if (Name == "x86.avx512.mask.cmp.b.128")
 282       return UpgradeAVX512CmpIntrinsic(F, Intrinsic::x86_avx512_mask_cmp_b_128,
 283                                        NewFn);
 284     if (Name == "x86.avx512.mask.cmp.w.128")
 285       return UpgradeAVX512CmpIntrinsic(F, Intrinsic::x86_avx512_mask_cmp_w_128,
 286                                        NewFn);
 287     if (Name == "x86.avx512.mask.cmp.d.128")
 288       return UpgradeAVX512CmpIntrinsic(F, Intrinsic::x86_avx512_mask_cmp_d_128,
 289                                        NewFn);
 290     if (Name == "x86.avx512.mask.cmp.q.128")
 291       return UpgradeAVX512CmpIntrinsic(F, Intrinsic::x86_avx512_mask_cmp_q_128,
 292                                        NewFn);
 293     if (Name == "x86.avx512.mask.ucmp.b.128")
 294       return UpgradeAVX512CmpIntrinsic(F, Intrinsic::x86_avx512_mask_ucmp_b_128,
 295                                        NewFn);
 296     if (Name == "x86.avx512.mask.ucmp.w.128")
 297       return UpgradeAVX512CmpIntrinsic(F, Intrinsic::x86_avx512_mask_ucmp_w_128,
 298                                        NewFn);
 299     if (Name == "x86.avx512.mask.ucmp.d.128")
 300       return UpgradeAVX512CmpIntrinsic(F, Intrinsic::x86_avx512_mask_ucmp_d_128,
 301                                        NewFn);
 302     if (Name == "x86.avx512.mask.ucmp.q.128")
 303       return UpgradeAVX512CmpIntrinsic(F, Intrinsic::x86_avx512_mask_ucmp_q_128,
 304                                        NewFn);
 305
 306     // frcz.ss/sd may need to have an argument dropped
 307     if (Name.startswith("x86.xop.vfrcz.ss") && F->arg_size() == 2) {
 308       F->setName(Name + ".old");
 309       NewFn = Intrinsic::getDeclaration(F->getParent(),
 310                                         Intrinsic::x86_xop_vfrcz_ss);
 311       return true;
 312     }
 313     if (Name.startswith("x86.xop.vfrcz.sd") && F->arg_size() == 2) {
 314       F->setName(Name + ".old");
 315       NewFn = Intrinsic::getDeclaration(F->getParent(),
 316                                         Intrinsic::x86_xop_vfrcz_sd);
 317       return true;
 318     }
 319     // Fix the FMA4 intrinsics to remove the 4
 320     if (Name.startswith("x86.fma4.")) {
 321       F->setName("llvm.x86.fma" + Name.substr(8));
 322       NewFn = F;
 323       return true;
 324     }
 325     break;
 326   }
 327   }
 328
 329   //  This may not belong here. This function is effectively being overloaded
 330   //  to both detect an intrinsic which needs upgrading, and to provide the
 331   //  upgraded form of the intrinsic. We should perhaps have two separate
 332   //  functions for this.
 333   return false;
 334 }
 335
 336 bool llvm::UpgradeIntrinsicFunction(Function *F, Function *&NewFn) {
 337   NewFn = nullptr;
 338   bool Upgraded = UpgradeIntrinsicFunction1(F, NewFn);
 339
 340   // Upgrade intrinsic attributes.  This does not change the function.
 341   if (NewFn)
 342     F = NewFn;
 343   if (unsigned id = F->getIntrinsicID())
 344     F->setAttributes(Intrinsic::getAttributes(F->getContext(),
 345                                               (Intrinsic::ID)id));
 346   return Upgraded;
 347 }
 348
 349 bool llvm::UpgradeGlobalVariable(GlobalVariable *GV) {
 350   // Nothing to do yet.
 351   return false;
 352 }
 353
 354 static MDNode *getNodeField(const MDNode *DbgNode, unsigned Elt) {
 355   if (!DbgNode || Elt >= DbgNode->getNumOperands())
 356     return nullptr;
 357   return dyn_cast_or_null<MDNode>(DbgNode->getOperand(Elt));
 358 }
 359
 360 static MetadataAsValue *getExpression(Value *VarOperand, Function *F) {
 361   // Old-style DIVariables have an optional expression as the 8th element.
 362   DIExpression Expr(getNodeField(
 363       cast<MDNode>(cast<MetadataAsValue>(VarOperand)->getMetadata()), 8));
 364   if (!Expr) {
 365     DIBuilder DIB(*F->getParent(), /*AllowUnresolved*/ false);
 366     Expr = DIB.createExpression();
 367   }
 368   return MetadataAsValue::get(F->getContext(), Expr);
 369 }
 370
 371 // UpgradeIntrinsicCall - Upgrade a call to an old intrinsic to be a call the
 372 // upgraded intrinsic. All argument and return casting must be provided in
 373 // order to seamlessly integrate with existing context.
 374 void llvm::UpgradeIntrinsicCall(CallInst *CI, Function *NewFn) {
 375   Function *F = CI->getCalledFunction();
 376   LLVMContext &C = CI->getContext();
 377   IRBuilder<> Builder(C);
 378   Builder.SetInsertPoint(CI->getParent(), CI);
 379
 380   assert(F && "Intrinsic call is not direct?");
 381
 382   if (!NewFn) {
 383     // Get the Function's name.
 384     StringRef Name = F->getName();
 385
 386     Value *Rep;
 387     // Upgrade packed integer vector compares intrinsics to compare instructions
 388     if (Name.startswith("llvm.x86.sse2.pcmpeq.") ||
 389         Name.startswith("llvm.x86.avx2.pcmpeq.")) {
 390       Rep = Builder.CreateICmpEQ(CI->getArgOperand(0), CI->getArgOperand(1),
 391                                  "pcmpeq");
 392       // need to sign extend since icmp returns vector of i1
 393       Rep = Builder.CreateSExt(Rep, CI->getType(), "");
 394     } else if (Name.startswith("llvm.x86.sse2.pcmpgt.") ||
 395                Name.startswith("llvm.x86.avx2.pcmpgt.")) {
 396       Rep = Builder.CreateICmpSGT(CI->getArgOperand(0), CI->getArgOperand(1),
 397                                   "pcmpgt");
 398       // need to sign extend since icmp returns vector of i1
 399       Rep = Builder.CreateSExt(Rep, CI->getType(), "");
 400     } else if (Name == "llvm.x86.avx.movnt.dq.256" ||
 401                Name == "llvm.x86.avx.movnt.ps.256" ||
 402                Name == "llvm.x86.avx.movnt.pd.256") {
 403       IRBuilder<> Builder(C);
 404       Builder.SetInsertPoint(CI->getParent(), CI);
 405
 406       Module *M = F->getParent();
 407       SmallVector<Metadata *, 1> Elts;
 408       Elts.push_back(
 409           ConstantAsMetadata::get(ConstantInt::get(Type::getInt32Ty(C), 1)));
 410       MDNode *Node = MDNode::get(C, Elts);
 411
 412       Value *Arg0 = CI->getArgOperand(0);
 413       Value *Arg1 = CI->getArgOperand(1);
 414
 415       // Convert the type of the pointer to a pointer to the stored type.
 416       Value *BC = Builder.CreateBitCast(Arg0,
 417                                         PointerType::getUnqual(Arg1->getType()),
 418                                         "cast");
 419       StoreInst *SI = Builder.CreateStore(Arg1, BC);
 420       SI->setMetadata(M->getMDKindID("nontemporal"), Node);
 421       SI->setAlignment(16);
 422
 423       // Remove intrinsic.
 424       CI->eraseFromParent();
 425       return;
 426     } else if (Name.startswith("llvm.x86.xop.vpcom")) {
 427       Intrinsic::ID intID;
 428       if (Name.endswith("ub"))
 429         intID = Intrinsic::x86_xop_vpcomub;
 430       else if (Name.endswith("uw"))
 431         intID = Intrinsic::x86_xop_vpcomuw;
 432       else if (Name.endswith("ud"))
 433         intID = Intrinsic::x86_xop_vpcomud;
 434       else if (Name.endswith("uq"))
 435         intID = Intrinsic::x86_xop_vpcomuq;
 436       else if (Name.endswith("b"))
 437         intID = Intrinsic::x86_xop_vpcomb;
 438       else if (Name.endswith("w"))
 439         intID = Intrinsic::x86_xop_vpcomw;
 440       else if (Name.endswith("d"))
 441         intID = Intrinsic::x86_xop_vpcomd;
 442       else if (Name.endswith("q"))
 443         intID = Intrinsic::x86_xop_vpcomq;
 444       else
 445         llvm_unreachable("Unknown suffix");
 446
 447       Name = Name.substr(18); // strip off "llvm.x86.xop.vpcom"
 448       unsigned Imm;
 449       if (Name.startswith("lt"))
 450         Imm = 0;
 451       else if (Name.startswith("le"))
 452         Imm = 1;
 453       else if (Name.startswith("gt"))
 454         Imm = 2;
 455       else if (Name.startswith("ge"))
 456         Imm = 3;
 457       else if (Name.startswith("eq"))
 458         Imm = 4;
 459       else if (Name.startswith("ne"))
 460         Imm = 5;
 461       else if (Name.startswith("true"))
 462         Imm = 6;
 463       else if (Name.startswith("false"))
 464         Imm = 7;
 465       else
 466         llvm_unreachable("Unknown condition");
 467
 468       Function *VPCOM = Intrinsic::getDeclaration(F->getParent(), intID);
 469       Rep = Builder.CreateCall3(VPCOM, CI->getArgOperand(0),
 470                                 CI->getArgOperand(1), Builder.getInt8(Imm));
 471     } else if (Name == "llvm.x86.sse42.crc32.64.8") {
 472       Function *CRC32 = Intrinsic::getDeclaration(F->getParent(),
 473                                                Intrinsic::x86_sse42_crc32_32_8);
 474       Value *Trunc0 = Builder.CreateTrunc(CI->getArgOperand(0), Type::getInt32Ty(C));
 475       Rep = Builder.CreateCall2(CRC32, Trunc0, CI->getArgOperand(1));
 476       Rep = Builder.CreateZExt(Rep, CI->getType(), "");
 477     } else if (Name.startswith("llvm.x86.avx.vbroadcast")) {
 478       // Replace broadcasts with a series of insertelements.
 479       Type *VecTy = CI->getType();
 480       Type *EltTy = VecTy->getVectorElementType();
 481       unsigned EltNum = VecTy->getVectorNumElements();
 482       Value *Cast = Builder.CreateBitCast(CI->getArgOperand(0),
 483                                           EltTy->getPointerTo());
 484       Value *Load = Builder.CreateLoad(Cast);
 485       Type *I32Ty = Type::getInt32Ty(C);
 486       Rep = UndefValue::get(VecTy);
 487       for (unsigned I = 0; I < EltNum; ++I)
 488         Rep = Builder.CreateInsertElement(Rep, Load,
 489                                           ConstantInt::get(I32Ty, I));
 490     } else {
 491       bool PD128 = false, PD256 = false, PS128 = false, PS256 = false;
 492       if (Name == "llvm.x86.avx.vpermil.pd.256")
 493         PD256 = true;
 494       else if (Name == "llvm.x86.avx.vpermil.pd")
 495         PD128 = true;
 496       else if (Name == "llvm.x86.avx.vpermil.ps.256")
 497         PS256 = true;
 498       else if (Name == "llvm.x86.avx.vpermil.ps")
 499         PS128 = true;
 500
 501       if (PD256 || PD128 || PS256 || PS128) {
 502         Value *Op0 = CI->getArgOperand(0);
 503         unsigned Imm = cast<ConstantInt>(CI->getArgOperand(1))->getZExtValue();
 504         SmallVector<Constant*, 8> Idxs;
 505
 506         if (PD128)
 507           for (unsigned i = 0; i != 2; ++i)
 508             Idxs.push_back(Builder.getInt32((Imm >> i) & 0x1));
 509         else if (PD256)
 510           for (unsigned l = 0; l != 4; l+=2)
 511             for (unsigned i = 0; i != 2; ++i)
 512               Idxs.push_back(Builder.getInt32(((Imm >> (l+i)) & 0x1) + l));
 513         else if (PS128)
 514           for (unsigned i = 0; i != 4; ++i)
 515             Idxs.push_back(Builder.getInt32((Imm >> (2 * i)) & 0x3));
 516         else if (PS256)
 517           for (unsigned l = 0; l != 8; l+=4)
 518             for (unsigned i = 0; i != 4; ++i)
 519               Idxs.push_back(Builder.getInt32(((Imm >> (2 * i)) & 0x3) + l));
 520         else
 521           llvm_unreachable("Unexpected function");
 522
 523         Rep = Builder.CreateShuffleVector(Op0, Op0, ConstantVector::get(Idxs));
 524       } else {
 525         llvm_unreachable("Unknown function for CallInst upgrade.");
 526       }
 527     }
 528
 529     CI->replaceAllUsesWith(Rep);
 530     CI->eraseFromParent();
 531     return;
 532   }
 533
 534   std::string Name = CI->getName().str();
 535   if (!Name.empty())
 536     CI->setName(Name + ".old");
 537
 538   switch (NewFn->getIntrinsicID()) {
 539   default:
 540     llvm_unreachable("Unknown function for CallInst upgrade.");
 541
 542   // Upgrade debug intrinsics to use an additional DIExpression argument.
 543   case Intrinsic::dbg_declare: {
 544     auto NewCI =
 545         Builder.CreateCall3(NewFn, CI->getArgOperand(0), CI->getArgOperand(1),
 546                             getExpression(CI->getArgOperand(1), F), Name);
 547     NewCI->setDebugLoc(CI->getDebugLoc());
 548     CI->replaceAllUsesWith(NewCI);
 549     CI->eraseFromParent();
 550     return;
 551   }
 552   case Intrinsic::dbg_value: {
 553     auto NewCI = Builder.CreateCall4(
 554         NewFn, CI->getArgOperand(0), CI->getArgOperand(1), CI->getArgOperand(2),
 555         getExpression(CI->getArgOperand(2), F), Name);
 556     NewCI->setDebugLoc(CI->getDebugLoc());
 557     CI->replaceAllUsesWith(NewCI);
 558     CI->eraseFromParent();
 559     return;
 560   }
 561   case Intrinsic::ctlz:
 562   case Intrinsic::cttz:
 563     assert(CI->getNumArgOperands() == 1 &&
 564            "Mismatch between function args and call args");
 565     CI->replaceAllUsesWith(Builder.CreateCall2(NewFn, CI->getArgOperand(0),
 566                                                Builder.getFalse(), Name));
 567     CI->eraseFromParent();
 568     return;
 569
 570   case Intrinsic::objectsize:
 571     CI->replaceAllUsesWith(Builder.CreateCall2(NewFn,
 572                                                CI->getArgOperand(0),
 573                                                CI->getArgOperand(1),
 574                                                Name));
 575     CI->eraseFromParent();
 576     return;
 577
 578   case Intrinsic::ctpop: {
 579     CI->replaceAllUsesWith(Builder.CreateCall(NewFn, CI->getArgOperand(0)));
 580     CI->eraseFromParent();
 581     return;
 582   }
 583
 584   case Intrinsic::x86_xop_vfrcz_ss:
 585   case Intrinsic::x86_xop_vfrcz_sd:
 586     CI->replaceAllUsesWith(Builder.CreateCall(NewFn, CI->getArgOperand(1),
 587                                               Name));
 588     CI->eraseFromParent();
 589     return;
 590
 591   case Intrinsic::x86_sse41_ptestc:
 592   case Intrinsic::x86_sse41_ptestz:
 593   case Intrinsic::x86_sse41_ptestnzc: {
 594     // The arguments for these intrinsics used to be v4f32, and changed
 595     // to v2i64. This is purely a nop, since those are bitwise intrinsics.
 596     // So, the only thing required is a bitcast for both arguments.
 597     // First, check the arguments have the old type.
 598     Value *Arg0 = CI->getArgOperand(0);
 599     if (Arg0->getType() != VectorType::get(Type::getFloatTy(C), 4))
 600       return;
 601
 602     // Old intrinsic, add bitcasts
 603     Value *Arg1 = CI->getArgOperand(1);
 604
 605     Value *BC0 =
 606       Builder.CreateBitCast(Arg0,
 607                             VectorType::get(Type::getInt64Ty(C), 2),
 608                             "cast");
 609     Value *BC1 =
 610       Builder.CreateBitCast(Arg1,
 611                             VectorType::get(Type::getInt64Ty(C), 2),
 612                             "cast");
 613
 614     CallInst* NewCall = Builder.CreateCall2(NewFn, BC0, BC1, Name);
 615     CI->replaceAllUsesWith(NewCall);
 616     CI->eraseFromParent();
 617     return;
 618   }
 619
 620   case Intrinsic::x86_sse41_pblendw:
 621   case Intrinsic::x86_sse41_blendpd:
 622   case Intrinsic::x86_sse41_blendps:
 623   case Intrinsic::x86_sse41_insertps:
 624   case Intrinsic::x86_sse41_dppd:
 625   case Intrinsic::x86_sse41_dpps:
 626   case Intrinsic::x86_sse41_mpsadbw:
 627   case Intrinsic::x86_avx_blend_pd_256:
 628   case Intrinsic::x86_avx_blend_ps_256:
 629   case Intrinsic::x86_avx_dp_ps_256:
 630   case Intrinsic::x86_avx2_pblendw:
 631   case Intrinsic::x86_avx2_pblendd_128:
 632   case Intrinsic::x86_avx2_pblendd_256:
 633   case Intrinsic::x86_avx2_mpsadbw: {
 634     // Need to truncate the last argument from i32 to i8 -- this argument models
 635     // an inherently 8-bit immediate operand to these x86 instructions.
 636     SmallVector<Value *, 4> Args(CI->arg_operands().begin(),
 637                                  CI->arg_operands().end());
 638
 639     // Replace the last argument with a trunc.
 640     Args.back() = Builder.CreateTrunc(Args.back(), Type::getInt8Ty(C), "trunc");
 641
 642     CallInst *NewCall = Builder.CreateCall(NewFn, Args);
 643     CI->replaceAllUsesWith(NewCall);
 644     CI->eraseFromParent();
 645     return;
 646   }
 647   case Intrinsic::x86_avx512_mask_cmp_ps_512:
 648   case Intrinsic::x86_avx512_mask_cmp_pd_512: {
 649     // Need to truncate the last argument from i32 to i8 -- this argument models
 650     // an inherently 8-bit immediate operand to these x86 instructions.
 651     SmallVector<Value *, 5> Args(CI->arg_operands().begin(),
 652                                  CI->arg_operands().end());
 653
 654     // Replace the last argument with a trunc.
 655     Args[2] = Builder.CreateTrunc(Args[2], Type::getInt8Ty(C), "trunc");
 656
 657     CallInst *NewCall = Builder.CreateCall(NewFn, Args);
 658     CI->replaceAllUsesWith(NewCall);
 659     CI->eraseFromParent();
 660     return;
 661   }
 662   }
 663 }
 664
 665 // This tests each Function to determine if it needs upgrading. When we find
 666 // one we are interested in, we then upgrade all calls to reflect the new
 667 // function.
 668 void llvm::UpgradeCallsToIntrinsic(Function* F) {
 669   assert(F && "Illegal attempt to upgrade a non-existent intrinsic.");
 670
 671   // Upgrade the function and check if it is a totaly new function.
 672   Function *NewFn;
 673   if (UpgradeIntrinsicFunction(F, NewFn)) {
 674     if (NewFn != F) {
 675       // Replace all uses to the old function with the new one if necessary.
 676       for (Value::user_iterator UI = F->user_begin(), UE = F->user_end();
 677            UI != UE; ) {
 678         if (CallInst *CI = dyn_cast<CallInst>(*UI++))
 679           UpgradeIntrinsicCall(CI, NewFn);
 680       }
 681       // Remove old function, no longer used, from the module.
 682       F->eraseFromParent();
 683     }
 684   }
 685 }
 686
 687 void llvm::UpgradeInstWithTBAATag(Instruction *I) {
 688   MDNode *MD = I->getMetadata(LLVMContext::MD_tbaa);
 689   assert(MD && "UpgradeInstWithTBAATag should have a TBAA tag");
 690   // Check if the tag uses struct-path aware TBAA format.
 691   if (isa<MDNode>(MD->getOperand(0)) && MD->getNumOperands() >= 3)
 692     return;
 693
 694   if (MD->getNumOperands() == 3) {
 695     Metadata *Elts[] = {MD->getOperand(0), MD->getOperand(1)};
 696     MDNode *ScalarType = MDNode::get(I->getContext(), Elts);
 697     // Create a MDNode <ScalarType, ScalarType, offset 0, const>
 698     Metadata *Elts2[] = {ScalarType, ScalarType,
 699                          ConstantAsMetadata::get(Constant::getNullValue(
 700                              Type::getInt64Ty(I->getContext()))),
 701                          MD->getOperand(2)};
 702     I->setMetadata(LLVMContext::MD_tbaa, MDNode::get(I->getContext(), Elts2));
 703   } else {
 704     // Create a MDNode <MD, MD, offset 0>
 705     Metadata *Elts[] = {MD, MD, ConstantAsMetadata::get(Constant::getNullValue(
 706                                     Type::getInt64Ty(I->getContext())))};
 707     I->setMetadata(LLVMContext::MD_tbaa, MDNode::get(I->getContext(), Elts));
 708   }
 709 }
 710
 711 Instruction *llvm::UpgradeBitCastInst(unsigned Opc, Value *V, Type *DestTy,
 712                                       Instruction *&Temp) {
 713   if (Opc != Instruction::BitCast)
 714     return nullptr;
 715
 716   Temp = nullptr;
 717   Type *SrcTy = V->getType();
 718   if (SrcTy->isPtrOrPtrVectorTy() && DestTy->isPtrOrPtrVectorTy() &&
 719       SrcTy->getPointerAddressSpace() != DestTy->getPointerAddressSpace()) {
 720     LLVMContext &Context = V->getContext();
 721
 722     // We have no information about target data layout, so we assume that
 723     // the maximum pointer size is 64bit.
 724     Type *MidTy = Type::getInt64Ty(Context);
 725     Temp = CastInst::Create(Instruction::PtrToInt, V, MidTy);
 726
 727     return CastInst::Create(Instruction::IntToPtr, Temp, DestTy);
 728   }
 729
 730   return nullptr;
 731 }
 732
 733 Value *llvm::UpgradeBitCastExpr(unsigned Opc, Constant *C, Type *DestTy) {
 734   if (Opc != Instruction::BitCast)
 735     return nullptr;
 736
 737   Type *SrcTy = C->getType();
 738   if (SrcTy->isPtrOrPtrVectorTy() && DestTy->isPtrOrPtrVectorTy() &&
 739       SrcTy->getPointerAddressSpace() != DestTy->getPointerAddressSpace()) {
 740     LLVMContext &Context = C->getContext();
 741
 742     // We have no information about target data layout, so we assume that
 743     // the maximum pointer size is 64bit.
 744     Type *MidTy = Type::getInt64Ty(Context);
 745
 746     return ConstantExpr::getIntToPtr(ConstantExpr::getPtrToInt(C, MidTy),
 747                                      DestTy);
 748   }
 749
 750   return nullptr;
 751 }
 752
 753 /// Check the debug info version number, if it is out-dated, drop the debug
 754 /// info. Return true if module is modified.
 755 bool llvm::UpgradeDebugInfo(Module &M) {
 756   unsigned Version = getDebugMetadataVersionFromModule(M);
 757   if (Version == DEBUG_METADATA_VERSION)
 758     return false;
 759
 760   bool RetCode = StripDebugInfo(M);
 761   if (RetCode) {
 762     DiagnosticInfoDebugMetadataVersion DiagVersion(M, Version);
 763     M.getContext().diagnose(DiagVersion);
 764   }
 765   return RetCode;
 766 }
 767
 768 void llvm::UpgradeMDStringConstant(std::string &String) {
 769   const std::string OldPrefix = "llvm.vectorizer.";
 770   if (String == "llvm.vectorizer.unroll") {
 771     String = "llvm.loop.interleave.count";
 772   } else if (String.find(OldPrefix) == 0) {
 773     String.replace(0, OldPrefix.size(), "llvm.loop.vectorize.");
 774   }
 775 }