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instcombine: Migrate isdigit optimizations

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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168578 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Meador Inge
2012-11-26 02:31:59 +00:00
parent d6a93075a1
commit a0798ec377
4 changed files with 67 additions and 42 deletions
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18
lib/Transforms/Utils/SimplifyLibCalls.cpp
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@ -1267,6 +1267,22 @@ struct AbsOpt : public LibCallOptimization {
}
};
struct IsDigitOpt : 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;
// isdigit(c) -> (c-'0') <u 10
Value *Op = CI->getArgOperand(0);
Op = B.CreateSub(Op, B.getInt32('0'), "isdigittmp");
Op = B.CreateICmpULT(Op, B.getInt32(10), "isdigit");
return B.CreateZExt(Op, CI->getType());
}
};
} // End anonymous namespace.
namespace llvm {
@ -1316,6 +1332,7 @@ class LibCallSimplifierImpl {
// Integer library call optimizations.
FFSOpt FFS;
AbsOpt Abs;
IsDigitOpt IsDigit;
void initOptimizations();
void addOpt(LibFunc::Func F, LibCallOptimization* Opt);
@ -1434,6 +1451,7 @@ void LibCallSimplifierImpl::initOptimizations() {
addOpt(LibFunc::abs, &Abs);
addOpt(LibFunc::labs, &Abs);
addOpt(LibFunc::llabs, &Abs);
addOpt(LibFunc::isdigit, &IsDigit);
}
Value *LibCallSimplifierImpl::optimizeCall(CallInst *CI) {