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author | Meador Inge <meadori@codesourcery.com> | 2012-11-29 15:45:43 +0000 |
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committer | Meador Inge <meadori@codesourcery.com> | 2012-11-29 15:45:43 +0000 |
commit | 5c5e230ac7ab03937f685baaf78525fd2b8154f1 (patch) | |
tree | 0a219068c175a9d1de0f53c2bdfe3c7351c048bd /lib/Transforms/Utils/SimplifyLibCalls.cpp | |
parent | c2e331275bac0e5e16f24bdb3ae4bc39a3caba5b (diff) | |
download | llvm-5c5e230ac7ab03937f685baaf78525fd2b8154f1.tar.gz llvm-5c5e230ac7ab03937f685baaf78525fd2b8154f1.tar.bz2 llvm-5c5e230ac7ab03937f685baaf78525fd2b8154f1.tar.xz |
instcombine: Migrate fputs optimizations
This patch migrates the fputs optimizations from the simplify-libcalls
pass into the instcombine library call simplifier.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168893 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Utils/SimplifyLibCalls.cpp')
-rw-r--r-- | lib/Transforms/Utils/SimplifyLibCalls.cpp | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/lib/Transforms/Utils/SimplifyLibCalls.cpp b/lib/Transforms/Utils/SimplifyLibCalls.cpp index 00a5d89cb2..8d81ba4554 100644 --- a/lib/Transforms/Utils/SimplifyLibCalls.cpp +++ b/lib/Transforms/Utils/SimplifyLibCalls.cpp @@ -1610,6 +1610,28 @@ struct FWriteOpt : public LibCallOptimization { } }; +struct FPutsOpt : public LibCallOptimization { + virtual Value *callOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) { + // These optimizations require DataLayout. + if (!TD) return 0; + + // Require two pointers. Also, we can't optimize if return value is used. + FunctionType *FT = Callee->getFunctionType(); + if (FT->getNumParams() != 2 || !FT->getParamType(0)->isPointerTy() || + !FT->getParamType(1)->isPointerTy() || + !CI->use_empty()) + return 0; + + // fputs(s,F) --> fwrite(s,1,strlen(s),F) + uint64_t Len = GetStringLength(CI->getArgOperand(0)); + if (!Len) return 0; + // Known to have no uses (see above). + return EmitFWrite(CI->getArgOperand(0), + ConstantInt::get(TD->getIntPtrType(*Context), Len-1), + CI->getArgOperand(1), B, TD, TLI); + } +}; + } // End anonymous namespace. namespace llvm { @@ -1668,6 +1690,7 @@ class LibCallSimplifierImpl { SPrintFOpt SPrintF; FPrintFOpt FPrintF; FWriteOpt FWrite; + FPutsOpt FPuts; void initOptimizations(); void addOpt(LibFunc::Func F, LibCallOptimization* Opt); @@ -1795,6 +1818,7 @@ void LibCallSimplifierImpl::initOptimizations() { addOpt(LibFunc::sprintf, &SPrintF); addOpt(LibFunc::fprintf, &FPrintF); addOpt(LibFunc::fwrite, &FWrite); + addOpt(LibFunc::fputs, &FPuts); } Value *LibCallSimplifierImpl::optimizeCall(CallInst *CI) { |