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instcombine: Migrate strto* optimizations

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This patch migrates the strto* optimizations from the simplify-libcalls
pass into the instcombine library call simplifier.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167119 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Meador Inge
2012-10-31 14:58:26 +00:00
parent 2857866138
commit e0f1dca1c8
4 changed files with 111 additions and 45 deletions
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28
lib/Transforms/Utils/SimplifyLibCalls.cpp
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@ -752,6 +752,26 @@ struct StrPBrkOpt : public LibCallOptimization {
}
};
struct StrToOpt : public LibCallOptimization {
virtual Value *callOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
FunctionType *FT = Callee->getFunctionType();
if ((FT->getNumParams() != 2 && FT->getNumParams() != 3) ||
!FT->getParamType(0)->isPointerTy() ||
!FT->getParamType(1)->isPointerTy())
return 0;
Value *EndPtr = CI->getArgOperand(1);
if (isa<ConstantPointerNull>(EndPtr)) {
// With a null EndPtr, this function won't capture the main argument.
// It would be readonly too, except that it still may write to errno.
CI->addAttribute(1, Attributes::get(Callee->getContext(),
Attributes::NoCapture));
}
return 0;
}
};
} // End anonymous namespace.
namespace llvm {
@ -781,6 +801,7 @@ class LibCallSimplifierImpl {
StrNCpyOpt StrNCpy;
StrLenOpt StrLen;
StrPBrkOpt StrPBrk;
StrToOpt StrTo;
void initOptimizations();
public:
@ -814,6 +835,13 @@ void LibCallSimplifierImpl::initOptimizations() {
Optimizations["strncpy"] = &StrNCpy;
Optimizations["strlen"] = &StrLen;
Optimizations["strpbrk"] = &StrPBrk;
Optimizations["strtol"] = &StrTo;
Optimizations["strtod"] = &StrTo;
Optimizations["strtof"] = &StrTo;
Optimizations["strtoul"] = &StrTo;
Optimizations["strtoll"] = &StrTo;
Optimizations["strtold"] = &StrTo;
Optimizations["strtoull"] = &StrTo;
}
Value *LibCallSimplifierImpl::optimizeCall(CallInst *CI) {