enable jump threading pass by default. This causes no miscompilations

and can significantly shrinkify some code, particularly from C++ land.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50025 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/tools/opt/opt.cpp b/tools/opt/opt.cpp
index ca206cf37f7fada0bdf24630d6516348e844633b..4b7dbf510667b0386a26ab09c16c15af529ae47e 100644 (file)
--- a/tools/opt/opt.cpp
+++ b/tools/opt/opt.cpp
@@ -267,6 +267,7 @@ void AddStandardCompilePasses(PassManager &PM) {
 
   addPass(PM, createTailDuplicationPass());      // Simplify cfg by copying code
   addPass(PM, createInstructionCombiningPass()); // Cleanup for scalarrepl.
+  addPass(PM, createJumpThreadingPass());        // Thread jumps.
   addPass(PM, createCFGSimplificationPass());    // Merge & remove BBs
   addPass(PM, createScalarReplAggregatesPass()); // Break up aggregate allocas
   addPass(PM, createInstructionCombiningPass()); // Combine silly seq's