instcombine: Migrate strto* optimizations
This patch migrates the strto* optimizations from the simplify-libcalls
pass into the instcombine library call simplifier.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167119 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Utils/SimplifyLibCalls.cpp b/lib/Transforms/Utils/SimplifyLibCalls.cpp
index 1aac8c5..04e36c4 100644
--- a/lib/Transforms/Utils/SimplifyLibCalls.cpp
+++ b/lib/Transforms/Utils/SimplifyLibCalls.cpp
@@ -752,6 +752,26 @@
}
};
+struct StrToOpt : public LibCallOptimization {
+ virtual Value *callOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
+ FunctionType *FT = Callee->getFunctionType();
+ if ((FT->getNumParams() != 2 && FT->getNumParams() != 3) ||
+ !FT->getParamType(0)->isPointerTy() ||
+ !FT->getParamType(1)->isPointerTy())
+ return 0;
+
+ Value *EndPtr = CI->getArgOperand(1);
+ if (isa<ConstantPointerNull>(EndPtr)) {
+ // With a null EndPtr, this function won't capture the main argument.
+ // It would be readonly too, except that it still may write to errno.
+ CI->addAttribute(1, Attributes::get(Callee->getContext(),
+ Attributes::NoCapture));
+ }
+
+ return 0;
+ }
+};
+
} // End anonymous namespace.
namespace llvm {
@@ -781,6 +801,7 @@
StrNCpyOpt StrNCpy;
StrLenOpt StrLen;
StrPBrkOpt StrPBrk;
+ StrToOpt StrTo;
void initOptimizations();
public:
@@ -814,6 +835,13 @@
Optimizations["strncpy"] = &StrNCpy;
Optimizations["strlen"] = &StrLen;
Optimizations["strpbrk"] = &StrPBrk;
+ Optimizations["strtol"] = &StrTo;
+ Optimizations["strtod"] = &StrTo;
+ Optimizations["strtof"] = &StrTo;
+ Optimizations["strtoul"] = &StrTo;
+ Optimizations["strtoll"] = &StrTo;
+ Optimizations["strtold"] = &StrTo;
+ Optimizations["strtoull"] = &StrTo;
}
Value *LibCallSimplifierImpl::optimizeCall(CallInst *CI) {