commit 3197b4453d214aa96de3a42da8f8fe189fff2077
author Bill Wendling <isanbard@gmail.com> Mon Apr 02 22:16:50 2012 +0000
committer Bill Wendling <isanbard@gmail.com> Mon Apr 02 22:16:50 2012 +0000
tree 38a68f4e6bd20272bab5c4ae4eb3b157c8e0271b
parent 29f60f359b59032108cdabcde91217b6784c4e13

Add an option to turn off the expensive GVN load PRE part of GVN.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153902 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/IPO/PassManagerBuilder.cpp

diff --git a/lib/Transforms/IPO/PassManagerBuilder.cpp b/lib/Transforms/IPO/PassManagerBuilder.cpp
index 243ba1a..a1b0a45 100644
--- a/lib/Transforms/IPO/PassManagerBuilder.cpp
+++ b/lib/Transforms/IPO/PassManagerBuilder.cpp
@@ -207,7 +207,8 @@
 
 void PassManagerBuilder::populateLTOPassManager(PassManagerBase &PM,
                                                 bool Internalize,
-                                                bool RunInliner) {
+                                                bool RunInliner,
+                                                bool DisableGVNLoadPRE) {
   // Provide AliasAnalysis services for optimizations.
   addInitialAliasAnalysisPasses(PM);
 
@@ -263,9 +264,9 @@
   PM.add(createFunctionAttrsPass()); // Add nocapture.
   PM.add(createGlobalsModRefPass()); // IP alias analysis.
 
-  PM.add(createLICMPass());      // Hoist loop invariants.
-  PM.add(createGVNPass());       // Remove redundancies.
-  PM.add(createMemCpyOptPass()); // Remove dead memcpys.
+  PM.add(createLICMPass());                 // Hoist loop invariants.
+  PM.add(createGVNPass(DisableGVNLoadPRE)); // Remove redundancies.
+  PM.add(createMemCpyOptPass());            // Remove dead memcpys.
   // Nuke dead stores.
   PM.add(createDeadStoreEliminationPass());