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-rw-r--r--lib/IR/AutoUpgrade.cpp393
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diff --git a/lib/IR/AutoUpgrade.cpp b/lib/IR/AutoUpgrade.cpp
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+//===-- AutoUpgrade.cpp - Implement auto-upgrade helper functions ---------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the auto-upgrade helper functions
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/AutoUpgrade.h"
+#include "llvm/Constants.h"
+#include "llvm/Function.h"
+#include "llvm/IRBuilder.h"
+#include "llvm/Instruction.h"
+#include "llvm/IntrinsicInst.h"
+#include "llvm/LLVMContext.h"
+#include "llvm/Module.h"
+#include "llvm/Support/CFG.h"
+#include "llvm/Support/CallSite.h"
+#include "llvm/Support/ErrorHandling.h"
+#include <cstring>
+using namespace llvm;
+
+// Upgrade the declarations of the SSE4.1 functions whose arguments have
+// changed their type from v4f32 to v2i64.
+static bool UpgradeSSE41Function(Function* F, Intrinsic::ID IID,
+ Function *&NewFn) {
+ // Check whether this is an old version of the function, which received
+ // v4f32 arguments.
+ Type *Arg0Type = F->getFunctionType()->getParamType(0);
+ if (Arg0Type != VectorType::get(Type::getFloatTy(F->getContext()), 4))
+ return false;
+
+ // Yes, it's old, replace it with new version.
+ F->setName(F->getName() + ".old");
+ NewFn = Intrinsic::getDeclaration(F->getParent(), IID);
+ return true;
+}
+
+static bool UpgradeIntrinsicFunction1(Function *F, Function *&NewFn) {
+ assert(F && "Illegal to upgrade a non-existent Function.");
+
+ // Quickly eliminate it, if it's not a candidate.
+ StringRef Name = F->getName();
+ if (Name.size() <= 8 || !Name.startswith("llvm."))
+ return false;
+ Name = Name.substr(5); // Strip off "llvm."
+
+ switch (Name[0]) {
+ default: break;
+ case 'a': {
+ if (Name.startswith("arm.neon.vclz")) {
+ Type* args[2] = {
+ F->arg_begin()->getType(),
+ Type::getInt1Ty(F->getContext())
+ };
+ // Can't use Intrinsic::getDeclaration here as it adds a ".i1" to
+ // the end of the name. Change name from llvm.arm.neon.vclz.* to
+ // llvm.ctlz.*
+ FunctionType* fType = FunctionType::get(F->getReturnType(), args, false);
+ NewFn = Function::Create(fType, F->getLinkage(),
+ "llvm.ctlz." + Name.substr(14), F->getParent());
+ return true;
+ }
+ if (Name.startswith("arm.neon.vcnt")) {
+ NewFn = Intrinsic::getDeclaration(F->getParent(), Intrinsic::ctpop,
+ F->arg_begin()->getType());
+ return true;
+ }
+ break;
+ }
+ case 'c': {
+ if (Name.startswith("ctlz.") && F->arg_size() == 1) {
+ F->setName(Name + ".old");
+ NewFn = Intrinsic::getDeclaration(F->getParent(), Intrinsic::ctlz,
+ F->arg_begin()->getType());
+ return true;
+ }
+ if (Name.startswith("cttz.") && F->arg_size() == 1) {
+ F->setName(Name + ".old");
+ NewFn = Intrinsic::getDeclaration(F->getParent(), Intrinsic::cttz,
+ F->arg_begin()->getType());
+ return true;
+ }
+ break;
+ }
+ case 'x': {
+ if (Name.startswith("x86.sse2.pcmpeq.") ||
+ Name.startswith("x86.sse2.pcmpgt.") ||
+ Name.startswith("x86.avx2.pcmpeq.") ||
+ Name.startswith("x86.avx2.pcmpgt.") ||
+ Name.startswith("x86.avx.vpermil.") ||
+ Name == "x86.avx.movnt.dq.256" ||
+ Name == "x86.avx.movnt.pd.256" ||
+ Name == "x86.avx.movnt.ps.256" ||
+ (Name.startswith("x86.xop.vpcom") && F->arg_size() == 2)) {
+ NewFn = 0;
+ return true;
+ }
+ // SSE4.1 ptest functions may have an old signature.
+ if (Name.startswith("x86.sse41.ptest")) {
+ if (Name == "x86.sse41.ptestc")
+ return UpgradeSSE41Function(F, Intrinsic::x86_sse41_ptestc, NewFn);
+ if (Name == "x86.sse41.ptestz")
+ return UpgradeSSE41Function(F, Intrinsic::x86_sse41_ptestz, NewFn);
+ if (Name == "x86.sse41.ptestnzc")
+ return UpgradeSSE41Function(F, Intrinsic::x86_sse41_ptestnzc, NewFn);
+ }
+ // frcz.ss/sd may need to have an argument dropped
+ if (Name.startswith("x86.xop.vfrcz.ss") && F->arg_size() == 2) {
+ F->setName(Name + ".old");
+ NewFn = Intrinsic::getDeclaration(F->getParent(),
+ Intrinsic::x86_xop_vfrcz_ss);
+ return true;
+ }
+ if (Name.startswith("x86.xop.vfrcz.sd") && F->arg_size() == 2) {
+ F->setName(Name + ".old");
+ NewFn = Intrinsic::getDeclaration(F->getParent(),
+ Intrinsic::x86_xop_vfrcz_sd);
+ return true;
+ }
+ // Fix the FMA4 intrinsics to remove the 4
+ if (Name.startswith("x86.fma4.")) {
+ F->setName("llvm.x86.fma" + Name.substr(8));
+ NewFn = F;
+ return true;
+ }
+ break;
+ }
+ }
+
+ // This may not belong here. This function is effectively being overloaded
+ // to both detect an intrinsic which needs upgrading, and to provide the
+ // upgraded form of the intrinsic. We should perhaps have two separate
+ // functions for this.
+ return false;
+}
+
+bool llvm::UpgradeIntrinsicFunction(Function *F, Function *&NewFn) {
+ NewFn = 0;
+ bool Upgraded = UpgradeIntrinsicFunction1(F, NewFn);
+
+ // Upgrade intrinsic attributes. This does not change the function.
+ if (NewFn)
+ F = NewFn;
+ if (unsigned id = F->getIntrinsicID())
+ F->setAttributes(Intrinsic::getAttributes(F->getContext(),
+ (Intrinsic::ID)id));
+ return Upgraded;
+}
+
+bool llvm::UpgradeGlobalVariable(GlobalVariable *GV) {
+ // Nothing to do yet.
+ return false;
+}
+
+// UpgradeIntrinsicCall - Upgrade a call to an old intrinsic to be a call the
+// upgraded intrinsic. All argument and return casting must be provided in
+// order to seamlessly integrate with existing context.
+void llvm::UpgradeIntrinsicCall(CallInst *CI, Function *NewFn) {
+ Function *F = CI->getCalledFunction();
+ LLVMContext &C = CI->getContext();
+ IRBuilder<> Builder(C);
+ Builder.SetInsertPoint(CI->getParent(), CI);
+
+ assert(F && "Intrinsic call is not direct?");
+
+ if (!NewFn) {
+ // Get the Function's name.
+ StringRef Name = F->getName();
+
+ Value *Rep;
+ // Upgrade packed integer vector compares intrinsics to compare instructions
+ if (Name.startswith("llvm.x86.sse2.pcmpeq.") ||
+ Name.startswith("llvm.x86.avx2.pcmpeq.")) {
+ Rep = Builder.CreateICmpEQ(CI->getArgOperand(0), CI->getArgOperand(1),
+ "pcmpeq");
+ // need to sign extend since icmp returns vector of i1
+ Rep = Builder.CreateSExt(Rep, CI->getType(), "");
+ } else if (Name.startswith("llvm.x86.sse2.pcmpgt.") ||
+ Name.startswith("llvm.x86.avx2.pcmpgt.")) {
+ Rep = Builder.CreateICmpSGT(CI->getArgOperand(0), CI->getArgOperand(1),
+ "pcmpgt");
+ // need to sign extend since icmp returns vector of i1
+ Rep = Builder.CreateSExt(Rep, CI->getType(), "");
+ } else if (Name == "llvm.x86.avx.movnt.dq.256" ||
+ Name == "llvm.x86.avx.movnt.ps.256" ||
+ Name == "llvm.x86.avx.movnt.pd.256") {
+ IRBuilder<> Builder(C);
+ Builder.SetInsertPoint(CI->getParent(), CI);
+
+ Module *M = F->getParent();
+ SmallVector<Value *, 1> Elts;
+ Elts.push_back(ConstantInt::get(Type::getInt32Ty(C), 1));
+ MDNode *Node = MDNode::get(C, Elts);
+
+ Value *Arg0 = CI->getArgOperand(0);
+ Value *Arg1 = CI->getArgOperand(1);
+
+ // Convert the type of the pointer to a pointer to the stored type.
+ Value *BC = Builder.CreateBitCast(Arg0,
+ PointerType::getUnqual(Arg1->getType()),
+ "cast");
+ StoreInst *SI = Builder.CreateStore(Arg1, BC);
+ SI->setMetadata(M->getMDKindID("nontemporal"), Node);
+ SI->setAlignment(16);
+
+ // Remove intrinsic.
+ CI->eraseFromParent();
+ return;
+ } else if (Name.startswith("llvm.x86.xop.vpcom")) {
+ Intrinsic::ID intID;
+ if (Name.endswith("ub"))
+ intID = Intrinsic::x86_xop_vpcomub;
+ else if (Name.endswith("uw"))
+ intID = Intrinsic::x86_xop_vpcomuw;
+ else if (Name.endswith("ud"))
+ intID = Intrinsic::x86_xop_vpcomud;
+ else if (Name.endswith("uq"))
+ intID = Intrinsic::x86_xop_vpcomuq;
+ else if (Name.endswith("b"))
+ intID = Intrinsic::x86_xop_vpcomb;
+ else if (Name.endswith("w"))
+ intID = Intrinsic::x86_xop_vpcomw;
+ else if (Name.endswith("d"))
+ intID = Intrinsic::x86_xop_vpcomd;
+ else if (Name.endswith("q"))
+ intID = Intrinsic::x86_xop_vpcomq;
+ else
+ llvm_unreachable("Unknown suffix");
+
+ Name = Name.substr(18); // strip off "llvm.x86.xop.vpcom"
+ unsigned Imm;
+ if (Name.startswith("lt"))
+ Imm = 0;
+ else if (Name.startswith("le"))
+ Imm = 1;
+ else if (Name.startswith("gt"))
+ Imm = 2;
+ else if (Name.startswith("ge"))
+ Imm = 3;
+ else if (Name.startswith("eq"))
+ Imm = 4;
+ else if (Name.startswith("ne"))
+ Imm = 5;
+ else if (Name.startswith("true"))
+ Imm = 6;
+ else if (Name.startswith("false"))
+ Imm = 7;
+ else
+ llvm_unreachable("Unknown condition");
+
+ Function *VPCOM = Intrinsic::getDeclaration(F->getParent(), intID);
+ Rep = Builder.CreateCall3(VPCOM, CI->getArgOperand(0),
+ CI->getArgOperand(1), Builder.getInt8(Imm));
+ } else {
+ bool PD128 = false, PD256 = false, PS128 = false, PS256 = false;
+ if (Name == "llvm.x86.avx.vpermil.pd.256")
+ PD256 = true;
+ else if (Name == "llvm.x86.avx.vpermil.pd")
+ PD128 = true;
+ else if (Name == "llvm.x86.avx.vpermil.ps.256")
+ PS256 = true;
+ else if (Name == "llvm.x86.avx.vpermil.ps")
+ PS128 = true;
+
+ if (PD256 || PD128 || PS256 || PS128) {
+ Value *Op0 = CI->getArgOperand(0);
+ unsigned Imm = cast<ConstantInt>(CI->getArgOperand(1))->getZExtValue();
+ SmallVector<Constant*, 8> Idxs;
+
+ if (PD128)
+ for (unsigned i = 0; i != 2; ++i)
+ Idxs.push_back(Builder.getInt32((Imm >> i) & 0x1));
+ else if (PD256)
+ for (unsigned l = 0; l != 4; l+=2)
+ for (unsigned i = 0; i != 2; ++i)
+ Idxs.push_back(Builder.getInt32(((Imm >> (l+i)) & 0x1) + l));
+ else if (PS128)
+ for (unsigned i = 0; i != 4; ++i)
+ Idxs.push_back(Builder.getInt32((Imm >> (2 * i)) & 0x3));
+ else if (PS256)
+ for (unsigned l = 0; l != 8; l+=4)
+ for (unsigned i = 0; i != 4; ++i)
+ Idxs.push_back(Builder.getInt32(((Imm >> (2 * i)) & 0x3) + l));
+ else
+ llvm_unreachable("Unexpected function");
+
+ Rep = Builder.CreateShuffleVector(Op0, Op0, ConstantVector::get(Idxs));
+ } else {
+ llvm_unreachable("Unknown function for CallInst upgrade.");
+ }
+ }
+
+ CI->replaceAllUsesWith(Rep);
+ CI->eraseFromParent();
+ return;
+ }
+
+ std::string Name = CI->getName().str();
+ CI->setName(Name + ".old");
+
+ switch (NewFn->getIntrinsicID()) {
+ default:
+ llvm_unreachable("Unknown function for CallInst upgrade.");
+
+ case Intrinsic::ctlz:
+ case Intrinsic::cttz:
+ assert(CI->getNumArgOperands() == 1 &&
+ "Mismatch between function args and call args");
+ CI->replaceAllUsesWith(Builder.CreateCall2(NewFn, CI->getArgOperand(0),
+ Builder.getFalse(), Name));
+ CI->eraseFromParent();
+ return;
+
+ case Intrinsic::arm_neon_vclz: {
+ // Change name from llvm.arm.neon.vclz.* to llvm.ctlz.*
+ CI->replaceAllUsesWith(Builder.CreateCall2(NewFn, CI->getArgOperand(0),
+ Builder.getFalse(),
+ "llvm.ctlz." + Name.substr(14)));
+ CI->eraseFromParent();
+ return;
+ }
+ case Intrinsic::ctpop: {
+ CI->replaceAllUsesWith(Builder.CreateCall(NewFn, CI->getArgOperand(0)));
+ CI->eraseFromParent();
+ return;
+ }
+
+ case Intrinsic::x86_xop_vfrcz_ss:
+ case Intrinsic::x86_xop_vfrcz_sd:
+ CI->replaceAllUsesWith(Builder.CreateCall(NewFn, CI->getArgOperand(1),
+ Name));
+ CI->eraseFromParent();
+ return;
+
+ case Intrinsic::x86_sse41_ptestc:
+ case Intrinsic::x86_sse41_ptestz:
+ case Intrinsic::x86_sse41_ptestnzc: {
+ // The arguments for these intrinsics used to be v4f32, and changed
+ // to v2i64. This is purely a nop, since those are bitwise intrinsics.
+ // So, the only thing required is a bitcast for both arguments.
+ // First, check the arguments have the old type.
+ Value *Arg0 = CI->getArgOperand(0);
+ if (Arg0->getType() != VectorType::get(Type::getFloatTy(C), 4))
+ return;
+
+ // Old intrinsic, add bitcasts
+ Value *Arg1 = CI->getArgOperand(1);
+
+ Value *BC0 =
+ Builder.CreateBitCast(Arg0,
+ VectorType::get(Type::getInt64Ty(C), 2),
+ "cast");
+ Value *BC1 =
+ Builder.CreateBitCast(Arg1,
+ VectorType::get(Type::getInt64Ty(C), 2),
+ "cast");
+
+ CallInst* NewCall = Builder.CreateCall2(NewFn, BC0, BC1, Name);
+ CI->replaceAllUsesWith(NewCall);
+ CI->eraseFromParent();
+ return;
+ }
+ }
+}
+
+// This tests each Function to determine if it needs upgrading. When we find
+// one we are interested in, we then upgrade all calls to reflect the new
+// function.
+void llvm::UpgradeCallsToIntrinsic(Function* F) {
+ assert(F && "Illegal attempt to upgrade a non-existent intrinsic.");
+
+ // Upgrade the function and check if it is a totaly new function.
+ Function *NewFn;
+ if (UpgradeIntrinsicFunction(F, NewFn)) {
+ if (NewFn != F) {
+ // Replace all uses to the old function with the new one if necessary.
+ for (Value::use_iterator UI = F->use_begin(), UE = F->use_end();
+ UI != UE; ) {
+ if (CallInst *CI = dyn_cast<CallInst>(*UI++))
+ UpgradeIntrinsicCall(CI, NewFn);
+ }
+ // Remove old function, no longer used, from the module.
+ F->eraseFromParent();
+ }
+ }
+}
+
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