[PATCH] D24730: Remove InstructionCombining and its related pass from sample pgo passes as we can handle "invoke" correctly.

[Dehao Chen via llvm-commits]

danielcdh created this revision.
danielcdh added a reviewer: dnovillo.
danielcdh added a subscriber: llvm-commits.

We previously relies on InstructionCombining pass to remove invoke instructions. Now that we can inline invoke instructions correctly, we do not need these passes any more.

https://reviews.llvm.org/D24730

Files:
  lib/CodeGen/BackendUtil.cpp
  test/CodeGen/pgo-sample.c

Index: test/CodeGen/pgo-sample.c
===================================================================
--- test/CodeGen/pgo-sample.c
+++ test/CodeGen/pgo-sample.c
@@ -2,8 +2,5 @@
 //
 // Ensure Pass PGOInstrumentationGenPass is invoked.
 // RUN: %clang_cc1 -O2 -fprofile-sample-use=%S/Inputs/pgo-sample.prof %s -mllvm -debug-pass=Structure -emit-llvm -o - 2>&1 | FileCheck %s
-// CHECK: Simplify the CFG
-// CHECK: SROA
-// CHECK: Combine redundant instructions
 // CHECK: Remove unused exception handling info
 // CHECK: Sample profile pass
Index: lib/CodeGen/BackendUtil.cpp
===================================================================
--- lib/CodeGen/BackendUtil.cpp
+++ lib/CodeGen/BackendUtil.cpp
@@ -149,17 +149,6 @@
   PM.add(createAddDiscriminatorsPass());
 }
 
-static void addCleanupPassesForSampleProfiler(
-    const PassManagerBuilder &Builder, legacy::PassManagerBase &PM) {
-  // instcombine is needed before sample profile annotation because it converts
-  // certain function calls to be inlinable. simplifycfg and sroa are needed
-  // before instcombine for necessary preparation. E.g. load store is eliminated
-  // properly so that instcombine will not introduce unecessary liverange.
-  PM.add(createCFGSimplificationPass());
-  PM.add(createSROAPass());
-  PM.add(createInstructionCombiningPass());
-}
-
 static void addBoundsCheckingPass(const PassManagerBuilder &Builder,
                                   legacy::PassManagerBase &PM) {
   PM.add(createBoundsCheckingPass());
@@ -464,8 +453,6 @@
   if (!CodeGenOpts.SampleProfileFile.empty()) {
     MPM.add(createPruneEHPass());
     MPM.add(createSampleProfileLoaderPass(CodeGenOpts.SampleProfileFile));
-    PMBuilder.addExtension(PassManagerBuilder::EP_EarlyAsPossible,
-                           addCleanupPassesForSampleProfiler);
   }
 
   PMBuilder.populateFunctionPassManager(FPM);


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