Enable InsertFreeze flag of JumpThreading when used in LTO

This patch enables inserting freeze when JumpThreading converts a select to
a conditional branch when it is run in LTO.

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D85534

diff --git a/llvm/lib/Passes/PassBuilder.cpp b/llvm/lib/Passes/PassBuilder.cpp
index 9a2e895..bae8478 100644 (file)
--- a/llvm/lib/Passes/PassBuilder.cpp
+++ b/llvm/lib/Passes/PassBuilder.cpp
@@ -1508,7 +1508,7 @@ PassBuilder::buildLTODefaultPipeline(OptimizationLevel Level, bool DebugLogging,
   FPM.addPass(InstCombinePass());
   invokePeepholeEPCallbacks(FPM, Level);
 
-  FPM.addPass(JumpThreadingPass());
+  FPM.addPass(JumpThreadingPass(/*InsertFreezeWhenUnfoldingSelect*/ true));
 
   // Do a post inline PGO instrumentation and use pass. This is a context
   // sensitive PGO pass.
@@ -1575,7 +1575,7 @@ PassBuilder::buildLTODefaultPipeline(OptimizationLevel Level, bool DebugLogging,
 
   MainFPM.addPass(InstCombinePass());
   invokePeepholeEPCallbacks(MainFPM, Level);
-  MainFPM.addPass(JumpThreadingPass());
+  MainFPM.addPass(JumpThreadingPass(/*InsertFreezeWhenUnfoldingSelect*/ true));
   MPM.addPass(createModuleToFunctionPassAdaptor(std::move(MainFPM)));
 
   // Create a function that performs CFI checks for cross-DSO calls with

diff --git a/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp b/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
index caa9a98..4b72a95 100644 (file)
--- a/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
+++ b/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
@@ -998,7 +998,7 @@ void PassManagerBuilder::addLTOOptimizationPasses(legacy::PassManagerBase &PM) {
   // The IPO passes may leave cruft around.  Clean up after them.
   PM.add(createInstructionCombiningPass());
   addExtensionsToPM(EP_Peephole, PM);
-  PM.add(createJumpThreadingPass());
+  PM.add(createJumpThreadingPass(/*FreezeSelectCond*/ true));
 
   // Break up allocas
   PM.add(createSROAPass());
@@ -1061,7 +1061,7 @@ void PassManagerBuilder::addLTOOptimizationPasses(legacy::PassManagerBase &PM) {
   PM.add(createInstructionCombiningPass());
   addExtensionsToPM(EP_Peephole, PM);
 
-  PM.add(createJumpThreadingPass());
+  PM.add(createJumpThreadingPass(/*FreezeSelectCond*/ true));
 }
 
 void PassManagerBuilder::addLateLTOOptimizationPasses(