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instcombine: Migrate isascii optimizations

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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168579 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Meador Inge
2012-11-26 03:10:07 +00:00
parent a0798ec377
commit 017bb750ab
3 changed files with 49 additions and 20 deletions
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20
lib/Transforms/Scalar/SimplifyLibCalls.cpp
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@@ -99,24 +99,6 @@ namespace {
// Integer Optimizations
//===----------------------------------------------------------------------===//
//===---------------------------------------===//
// 'isascii' Optimizations
struct IsAsciiOpt : public LibCallOptimization {
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
FunctionType *FT = Callee->getFunctionType();
// We require integer(i32)
if (FT->getNumParams() != 1 || !FT->getReturnType()->isIntegerTy() ||
!FT->getParamType(0)->isIntegerTy(32))
return 0;
// isascii(c) -> c <u 128
Value *Op = CI->getArgOperand(0);
Op = B.CreateICmpULT(Op, B.getInt32(128), "isascii");
return B.CreateZExt(Op, CI->getType());
}
};
//===---------------------------------------===//
// 'toascii' Optimizations
@@ -502,7 +484,6 @@ namespace {
StringMap<LibCallOptimization*> Optimizations;
// Integer Optimizations
IsAsciiOpt IsAscii;
ToAsciiOpt ToAscii;
// Formatting and IO Optimizations
SPrintFOpt SPrintF; PrintFOpt PrintF;
@@ -563,7 +544,6 @@ void SimplifyLibCalls::AddOpt(LibFunc::Func F1, LibFunc::Func F2,
/// we know.
void SimplifyLibCalls::InitOptimizations() {
// Integer Optimizations
Optimizations["isascii"] = &IsAscii;
Optimizations["toascii"] = &ToAscii;
// Formatting and IO Optimizations