llvm-6502/lib/VMCore/AutoUpgrade.cpp
Chris Lattner 747fddd484 rework the remaining autoupgrade logic to use a StringRef instead of creating a
temporary std::string for every function being checked.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133355 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-18 18:56:39 +00:00

282 lines
10 KiB
C++

//===-- 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/LLVMContext.h"
#include "llvm/Module.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/CallSite.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/IRBuilder.h"
#include <cstring>
using namespace llvm;
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."
const FunctionType *FTy = F->getFunctionType();
Module *M = F->getParent();
switch (Name[0]) {
default: break;
case 'p':
// This upgrades the llvm.prefetch intrinsic to accept one more parameter,
// which is a instruction / data cache identifier. The old version only
// implicitly accepted the data version.
if (Name == "prefetch") {
// Don't do anything if it has the correct number of arguments already
if (FTy->getNumParams() == 4)
break;
assert(FTy->getNumParams() == 3 && "old prefetch takes 3 args!");
// We first need to change the name of the old (bad) intrinsic, because
// its type is incorrect, but we cannot overload that name. We
// arbitrarily unique it here allowing us to construct a correctly named
// and typed function below.
std::string NameTmp = F->getName();
F->setName("");
NewFn = cast<Function>(M->getOrInsertFunction(NameTmp,
FTy->getReturnType(),
FTy->getParamType(0),
FTy->getParamType(1),
FTy->getParamType(2),
FTy->getParamType(2),
(Type*)0));
return true;
}
break;
case 'x': {
const char *NewFnName = NULL;
// This fixes the poorly named crc32 intrinsics.
if (Name == "x86.sse42.crc32.8")
NewFnName = "llvm.x86.sse42.crc32.32.8";
else if (Name == "x86.sse42.crc32.16")
NewFnName = "llvm.x86.sse42.crc32.32.16";
else if (Name == "x86.sse42.crc32.32")
NewFnName = "llvm.x86.sse42.crc32.32.32";
else if (Name == "x86.sse42.crc64.8")
NewFnName = "llvm.x86.sse42.crc32.64.8";
else if (Name == "x86.sse42.crc64.64")
NewFnName = "llvm.x86.sse42.crc32.64.64";
if (NewFnName) {
F->setName(NewFnName);
NewFn = F;
return true;
}
// Calls to these instructions are transformed into unaligned loads.
if (Name == "x86.sse.loadu.ps" || Name == "x86.sse2.loadu.dq" ||
Name == "x86.sse2.loadu.pd")
return true;
// Calls to these instructions are transformed into nontemporal stores.
if (Name == "x86.sse.movnt.ps" || Name == "x86.sse2.movnt.dq" ||
Name == "x86.sse2.movnt.pd" || Name == "x86.sse2.movnt.i")
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((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();
ImmutableCallSite CS(CI);
assert(F && "CallInst has no function associated with it.");
if (!NewFn) {
if (F->getName() == "llvm.x86.sse.loadu.ps" ||
F->getName() == "llvm.x86.sse2.loadu.dq" ||
F->getName() == "llvm.x86.sse2.loadu.pd") {
// Convert to a native, unaligned load.
const Type *VecTy = CI->getType();
const Type *IntTy = IntegerType::get(C, 128);
IRBuilder<> Builder(C);
Builder.SetInsertPoint(CI->getParent(), CI);
Value *BC = Builder.CreateBitCast(CI->getArgOperand(0),
PointerType::getUnqual(IntTy),
"cast");
LoadInst *LI = Builder.CreateLoad(BC, CI->getName());
LI->setAlignment(1); // Unaligned load.
BC = Builder.CreateBitCast(LI, VecTy, "new.cast");
// Fix up all the uses with our new load.
if (!CI->use_empty())
CI->replaceAllUsesWith(BC);
// Remove intrinsic.
CI->eraseFromParent();
} else if (F->getName() == "llvm.x86.sse.movnt.ps" ||
F->getName() == "llvm.x86.sse2.movnt.dq" ||
F->getName() == "llvm.x86.sse2.movnt.pd" ||
F->getName() == "llvm.x86.sse2.movnt.i") {
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();
} else {
llvm_unreachable("Unknown function for CallInst upgrade.");
}
return;
}
switch (NewFn->getIntrinsicID()) {
case Intrinsic::prefetch: {
IRBuilder<> Builder(C);
Builder.SetInsertPoint(CI->getParent(), CI);
const llvm::Type *I32Ty = llvm::Type::getInt32Ty(CI->getContext());
// Add the extra "data cache" argument
Value *Operands[4] = { CI->getArgOperand(0), CI->getArgOperand(1),
CI->getArgOperand(2),
llvm::ConstantInt::get(I32Ty, 1) };
CallInst *NewCI = CallInst::Create(NewFn, Operands, Operands+4,
CI->getName(), CI);
NewCI->setTailCall(CI->isTailCall());
NewCI->setCallingConv(CI->getCallingConv());
// Handle any uses of the old CallInst.
if (!CI->use_empty())
// Replace all uses of the old call with the new cast which has the
// correct type.
CI->replaceAllUsesWith(NewCI);
// Clean up the old call now that it has been completely upgraded.
CI->eraseFromParent();
break;
}
}
}
// 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();
}
}
}
/// This function strips all debug info intrinsics, except for llvm.dbg.declare.
/// If an llvm.dbg.declare intrinsic is invalid, then this function simply
/// strips that use.
void llvm::CheckDebugInfoIntrinsics(Module *M) {
if (Function *FuncStart = M->getFunction("llvm.dbg.func.start")) {
while (!FuncStart->use_empty())
cast<CallInst>(FuncStart->use_back())->eraseFromParent();
FuncStart->eraseFromParent();
}
if (Function *StopPoint = M->getFunction("llvm.dbg.stoppoint")) {
while (!StopPoint->use_empty())
cast<CallInst>(StopPoint->use_back())->eraseFromParent();
StopPoint->eraseFromParent();
}
if (Function *RegionStart = M->getFunction("llvm.dbg.region.start")) {
while (!RegionStart->use_empty())
cast<CallInst>(RegionStart->use_back())->eraseFromParent();
RegionStart->eraseFromParent();
}
if (Function *RegionEnd = M->getFunction("llvm.dbg.region.end")) {
while (!RegionEnd->use_empty())
cast<CallInst>(RegionEnd->use_back())->eraseFromParent();
RegionEnd->eraseFromParent();
}
if (Function *Declare = M->getFunction("llvm.dbg.declare")) {
if (!Declare->use_empty()) {
DbgDeclareInst *DDI = cast<DbgDeclareInst>(Declare->use_back());
if (!isa<MDNode>(DDI->getArgOperand(0)) ||
!isa<MDNode>(DDI->getArgOperand(1))) {
while (!Declare->use_empty()) {
CallInst *CI = cast<CallInst>(Declare->use_back());
CI->eraseFromParent();
}
Declare->eraseFromParent();
}
}
}
}