For each function that we optimize we initialize a new list of lib functions. For each function name we malloc memory. This patch changes the Libcall map to use BumpPtrAllocator. Now we malloc only once. This speeds up instcombine by a few % on a large c++ program.

llvm-svn: 176170

1 files changed, 2 insertions, 1 deletions

diff --git a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
index 8ad566c893c..9b39bf40c88 100644
--- a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
@@ -23,6 +23,7 @@
 #include "llvm/IR/Intrinsics.h"
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Module.h"
+#include "llvm/Support/Allocator.h"
 #include "llvm/Target/TargetLibraryInfo.h"
 #include "llvm/Transforms/Utils/BuildLibCalls.h"
 
@@ -1672,7 +1673,7 @@ class LibCallSimplifierImpl {
   const TargetLibraryInfo *TLI;
   const LibCallSimplifier *LCS;
   bool UnsafeFPShrink;
-  StringMap<LibCallOptimization*> Optimizations;
+  StringMap<LibCallOptimization*, BumpPtrAllocator> Optimizations;
 
   // Fortified library call optimizations.
   MemCpyChkOpt MemCpyChk;