instcombine: Migrate toascii optimizations
This patch migrates the toascii optimizations from the simplify-libcalls
pass into the instcombine library call simplifier.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168580 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Utils/SimplifyLibCalls.cpp b/lib/Transforms/Utils/SimplifyLibCalls.cpp
index 2b390c1..27ccdc1 100644
--- a/lib/Transforms/Utils/SimplifyLibCalls.cpp
+++ b/lib/Transforms/Utils/SimplifyLibCalls.cpp
@@ -1298,6 +1298,20 @@
}
};
+struct ToAsciiOpt : public LibCallOptimization {
+ virtual Value *callOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
+ FunctionType *FT = Callee->getFunctionType();
+ // We require i32(i32)
+ if (FT->getNumParams() != 1 || FT->getReturnType() != FT->getParamType(0) ||
+ !FT->getParamType(0)->isIntegerTy(32))
+ return 0;
+
+ // isascii(c) -> c & 0x7f
+ return B.CreateAnd(CI->getArgOperand(0),
+ ConstantInt::get(CI->getType(),0x7F));
+ }
+};
+
} // End anonymous namespace.
namespace llvm {
@@ -1349,6 +1363,7 @@
AbsOpt Abs;
IsDigitOpt IsDigit;
IsAsciiOpt IsAscii;
+ ToAsciiOpt ToAscii;
void initOptimizations();
void addOpt(LibFunc::Func F, LibCallOptimization* Opt);
@@ -1469,6 +1484,7 @@
addOpt(LibFunc::llabs, &Abs);
addOpt(LibFunc::isdigit, &IsDigit);
addOpt(LibFunc::isascii, &IsAscii);
+ addOpt(LibFunc::toascii, &ToAscii);
}
Value *LibCallSimplifierImpl::optimizeCall(CallInst *CI) {