[llvm] cb9ca35 - [LoopRotate][NPM] Disable header duplication under -Oz
Arthur Eubanks via llvm-commits
llvm-commits at lists.llvm.org
Thu Oct 22 08:39:33 PDT 2020
Author: Arthur Eubanks
Date: 2020-10-22T08:39:12-07:00
New Revision: cb9ca3597727bb323576972a6a74b5897125b41a
URL: https://github.com/llvm/llvm-project/commit/cb9ca3597727bb323576972a6a74b5897125b41a
DIFF: https://github.com/llvm/llvm-project/commit/cb9ca3597727bb323576972a6a74b5897125b41a.diff
LOG: [LoopRotate][NPM] Disable header duplication under -Oz
It was already disabled under -Oz in
buildFunctionSimplificationPipeline(), but not in
buildModuleOptimizationPipeline()/addPGOInstrPasses().
Reviewed By: fhahn
Differential Revision: https://reviews.llvm.org/D89927
Added:
Modified:
llvm/lib/Passes/PassBuilder.cpp
llvm/test/Transforms/LoopRotate/oz-disable.ll
Removed:
################################################################################
diff --git a/llvm/lib/Passes/PassBuilder.cpp b/llvm/lib/Passes/PassBuilder.cpp
index 199e459e3d6c..ab4b305f250a 100644
--- a/llvm/lib/Passes/PassBuilder.cpp
+++ b/llvm/lib/Passes/PassBuilder.cpp
@@ -677,7 +677,7 @@ PassBuilder::buildFunctionSimplificationPipeline(OptimizationLevel Level,
LPM1.addPass(LoopInstSimplifyPass());
LPM1.addPass(LoopSimplifyCFGPass());
- // Rotate Loop - disable header duplication at -Oz
+ // Disable header duplication in loop rotation at -Oz.
LPM1.addPass(LoopRotatePass(Level != OptimizationLevel::Oz));
// TODO: Investigate promotion cap for O1.
LPM1.addPass(LICMPass(PTO.LicmMssaOptCap, PTO.LicmMssaNoAccForPromotionCap));
@@ -833,8 +833,9 @@ void PassBuilder::addPGOInstrPasses(ModulePassManager &MPM, bool DebugLogging,
MPM.addPass(PGOInstrumentationGen(IsCS));
FunctionPassManager FPM;
+ // Disable header duplication in loop rotation at -Oz.
FPM.addPass(createFunctionToLoopPassAdaptor(
- LoopRotatePass(), EnableMSSALoopDependency,
+ LoopRotatePass(Level != OptimizationLevel::Oz), EnableMSSALoopDependency,
/*UseBlockFrequencyInfo=*/false, DebugLogging));
MPM.addPass(createModuleToFunctionPassAdaptor(std::move(FPM)));
@@ -1164,8 +1165,9 @@ ModulePassManager PassBuilder::buildModuleOptimizationPipeline(
C(OptimizePM, Level);
// First rotate loops that may have been un-rotated by prior passes.
+ // Disable header duplication at -Oz.
OptimizePM.addPass(createFunctionToLoopPassAdaptor(
- LoopRotatePass(), EnableMSSALoopDependency,
+ LoopRotatePass(Level != OptimizationLevel::Oz), EnableMSSALoopDependency,
/*UseBlockFrequencyInfo=*/false, DebugLogging));
// Distribute loops to allow partial vectorization. I.e. isolate dependences
diff --git a/llvm/test/Transforms/LoopRotate/oz-disable.ll b/llvm/test/Transforms/LoopRotate/oz-disable.ll
index 7a6a9bf33a18..5ac7864b33aa 100644
--- a/llvm/test/Transforms/LoopRotate/oz-disable.ll
+++ b/llvm/test/Transforms/LoopRotate/oz-disable.ll
@@ -1,6 +1,8 @@
; REQUIRES: asserts
; RUN: opt < %s -S -Os -debug -debug-only=loop-rotate 2>&1 | FileCheck %s -check-prefix=OS
; RUN: opt < %s -S -Oz -debug -debug-only=loop-rotate 2>&1 | FileCheck %s -check-prefix=OZ
+; RUN: opt < %s -S -passes='default<Os>' -debug -debug-only=loop-rotate 2>&1 | FileCheck %s -check-prefix=OS
+; RUN: opt < %s -S -passes='default<Oz>' -debug -debug-only=loop-rotate 2>&1 | FileCheck %s -check-prefix=OZ
; Loop should be rotated for -Os but not for -Oz.
; OS: rotating Loop at depth 1
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