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instcombine: Migrate memset optimizations

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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167689 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Meador Inge
2012-11-11 06:49:03 +00:00
parent d324c48e55
commit 26ebe398f2
6 changed files with 55 additions and 51 deletions
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21
lib/Transforms/Utils/SimplifyLibCalls.cpp
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@@ -997,6 +997,25 @@ struct MemMoveOpt : public LibCallOptimization {
}
};
struct MemSetOpt : public LibCallOptimization {
virtual Value *callOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
// These optimizations require DataLayout.
if (!TD) return 0;
FunctionType *FT = Callee->getFunctionType();
if (FT->getNumParams() != 3 || FT->getReturnType() != FT->getParamType(0) ||
!FT->getParamType(0)->isPointerTy() ||
!FT->getParamType(1)->isIntegerTy() ||
FT->getParamType(2) != TD->getIntPtrType(*Context))
return 0;
// memset(p, v, n) -> llvm.memset(p, v, n, 1)
Value *Val = B.CreateIntCast(CI->getArgOperand(1), B.getInt8Ty(), false);
B.CreateMemSet(CI->getArgOperand(0), Val, CI->getArgOperand(2), 1);
return CI->getArgOperand(0);
}
};
} // End anonymous namespace.
namespace llvm {
@@ -1036,6 +1055,7 @@ class LibCallSimplifierImpl {
MemCmpOpt MemCmp;
MemCpyOpt MemCpy;
MemMoveOpt MemMove;
MemSetOpt MemSet;
void initOptimizations();
void addOpt(LibFunc::Func F, LibCallOptimization* Opt);
@@ -1087,6 +1107,7 @@ void LibCallSimplifierImpl::initOptimizations() {
addOpt(LibFunc::memcmp, &MemCmp);
addOpt(LibFunc::memcpy, &MemCpy);
addOpt(LibFunc::memmove, &MemMove);
addOpt(LibFunc::memset, &MemSet);
}
Value *LibCallSimplifierImpl::optimizeCall(CallInst *CI) {