From dd9234a10ae55a473757d4e2bd5d0351986a2516 Mon Sep 17 00:00:00 2001 From: Meador Inge Date: Sun, 11 Nov 2012 05:54:34 +0000 Subject: instcombine: Migrate memcpy optimizations This patch migrates the memcpy optimizations from the simplify-libcalls pass into the instcombine library call simplifier. llvm-svn: 167686 --- llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) (limited to 'llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp') diff --git a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp index 805fcbe3cb1..c57991bd9e3 100644 --- a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp +++ b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp @@ -959,6 +959,25 @@ struct MemCmpOpt : public LibCallOptimization { } }; +struct MemCpyOpt : 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)->isPointerTy() || + FT->getParamType(2) != TD->getIntPtrType(*Context)) + return 0; + + // memcpy(x, y, n) -> llvm.memcpy(x, y, n, 1) + B.CreateMemCpy(CI->getArgOperand(0), CI->getArgOperand(1), + CI->getArgOperand(2), 1); + return CI->getArgOperand(0); + } +}; + } // End anonymous namespace. namespace llvm { @@ -996,6 +1015,7 @@ class LibCallSimplifierImpl { // Memory library call optimizations. MemCmpOpt MemCmp; + MemCpyOpt MemCpy; void initOptimizations(); void addOpt(LibFunc::Func F, LibCallOptimization* Opt); @@ -1045,6 +1065,7 @@ void LibCallSimplifierImpl::initOptimizations() { // Memory library call optimizations. addOpt(LibFunc::memcmp, &MemCmp); + addOpt(LibFunc::memcpy, &MemCpy); } Value *LibCallSimplifierImpl::optimizeCall(CallInst *CI) { -- cgit v1.2.3