From: Dehao Chen <dehao@google.com>
Date: Mon, 19 Sep 2016 16:02:52 +0000 (+0000)
Subject: Remove InstructionCombining and its related pass from sample pgo passes as we can... 
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=d121635fd911d2fc185baecf32ab9f02d60bdeb2;p=clang

Remove InstructionCombining and its related pass from sample pgo passes as we can handle "invoke" correctly.

Summary: 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.

Reviewers: dnovillo

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D24730

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@281910 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/BackendUtil.cpp b/lib/CodeGen/BackendUtil.cpp
index 886221d75e..541e676be2 100644
--- a/lib/CodeGen/BackendUtil.cpp
+++ b/lib/CodeGen/BackendUtil.cpp
@@ -149,17 +149,6 @@ static void addAddDiscriminatorsPass(const PassManagerBuilder &Builder,
   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 @@ void EmitAssemblyHelper::CreatePasses(legacy::PassManager &MPM,
   if (!CodeGenOpts.SampleProfileFile.empty()) {
     MPM.add(createPruneEHPass());
     MPM.add(createSampleProfileLoaderPass(CodeGenOpts.SampleProfileFile));
-    PMBuilder.addExtension(PassManagerBuilder::EP_EarlyAsPossible,
-                           addCleanupPassesForSampleProfiler);
   }
 
   PMBuilder.populateFunctionPassManager(FPM);
diff --git a/test/CodeGen/pgo-sample.c b/test/CodeGen/pgo-sample.c
index c955edfab7..e7d2fa61aa 100644
--- a/test/CodeGen/pgo-sample.c
+++ b/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