From: Roman Divacky <rdivacky@freebsd.org>
Date: Fri, 21 Nov 2014 19:53:24 +0000 (+0000)
Subject: Disable header duplication at -Oz in loop-rotate pass.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=9bd372345cf7fc81a89b9ed7e3e9b043b2e0449f;p=oota-llvm.git

Disable header duplication at -Oz in loop-rotate pass.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222562 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Transforms/IPO/PassManagerBuilder.cpp b/lib/Transforms/IPO/PassManagerBuilder.cpp
index da85a91c78a..0414caa61fc 100644
--- a/lib/Transforms/IPO/PassManagerBuilder.cpp
+++ b/lib/Transforms/IPO/PassManagerBuilder.cpp
@@ -228,7 +228,8 @@ void PassManagerBuilder::populateModulePassManager(PassManagerBase &MPM) {
     MPM.add(createTailCallEliminationPass()); // Eliminate tail calls
   MPM.add(createCFGSimplificationPass());     // Merge & remove BBs
   MPM.add(createReassociatePass());           // Reassociate expressions
-  MPM.add(createLoopRotatePass());            // Rotate Loop
+  // Rotate Loop - disable header duplication at -Oz
+  MPM.add(createLoopRotatePass(SizeLevel == 2 ? 0 : -1));
   MPM.add(createLICMPass());                  // Hoist loop invariants
   MPM.add(createLoopUnswitchPass(SizeLevel || OptLevel < 3));
   MPM.add(createInstructionCombiningPass());