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instcombine: Migrate fputs optimizations

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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168893 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Meador Inge
2012-11-29 15:45:43 +00:00
parent c2e331275b
commit 5c5e230ac7
5 changed files with 69 additions and 58 deletions
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24
lib/Transforms/Utils/SimplifyLibCalls.cpp
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@ -1610,6 +1610,28 @@ struct FWriteOpt : public LibCallOptimization {
}
};
struct FPutsOpt : public LibCallOptimization {
virtual Value *callOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
// These optimizations require DataLayout.
if (!TD) return 0;
// Require two pointers. Also, we can't optimize if return value is used.
FunctionType *FT = Callee->getFunctionType();
if (FT->getNumParams() != 2 || !FT->getParamType(0)->isPointerTy() ||
!FT->getParamType(1)->isPointerTy() ||
!CI->use_empty())
return 0;
// fputs(s,F) --> fwrite(s,1,strlen(s),F)
uint64_t Len = GetStringLength(CI->getArgOperand(0));
if (!Len) return 0;
// Known to have no uses (see above).
return EmitFWrite(CI->getArgOperand(0),
ConstantInt::get(TD->getIntPtrType(*Context), Len-1),
CI->getArgOperand(1), B, TD, TLI);
}
};
} // End anonymous namespace.
namespace llvm {
@ -1668,6 +1690,7 @@ class LibCallSimplifierImpl {
SPrintFOpt SPrintF;
FPrintFOpt FPrintF;
FWriteOpt FWrite;
FPutsOpt FPuts;
void initOptimizations();
void addOpt(LibFunc::Func F, LibCallOptimization* Opt);
@ -1795,6 +1818,7 @@ void LibCallSimplifierImpl::initOptimizations() {
addOpt(LibFunc::sprintf, &SPrintF);
addOpt(LibFunc::fprintf, &FPrintF);
addOpt(LibFunc::fwrite, &FWrite);
addOpt(LibFunc::fputs, &FPuts);
}
Value *LibCallSimplifierImpl::optimizeCall(CallInst *CI) {