From 84986b298ae1110529871a19e1b4c9ab81281e10 Mon Sep 17 00:00:00 2001
From: Cameron Zwarich <zwarich@apple.com>
Date: Sat, 8 Jan 2011 17:01:52 +0000
Subject: Make more passes preserve dominators (or state that they preserve
 dominators if they all ready do). This removes two dominator recomputations
 prior to isel, which is a 1% improvement in total llc time for 403.gcc.

The only potentially suspect thing is making GCStrategy recompute dominators if
it used a custom lowering strategy.

llvm-svn: 123064
---
 llvm/lib/CodeGen/UnreachableBlockElim.cpp | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'llvm/lib/CodeGen/UnreachableBlockElim.cpp')

diff --git a/llvm/lib/CodeGen/UnreachableBlockElim.cpp b/llvm/lib/CodeGen/UnreachableBlockElim.cpp
index 4fdb2288247..48d8ab1658d 100644
--- a/llvm/lib/CodeGen/UnreachableBlockElim.cpp
+++ b/llvm/lib/CodeGen/UnreachableBlockElim.cpp
@@ -26,6 +26,7 @@
 #include "llvm/Function.h"
 #include "llvm/Pass.h"
 #include "llvm/Type.h"
+#include "llvm/Analysis/Dominators.h"
 #include "llvm/Analysis/ProfileInfo.h"
 #include "llvm/CodeGen/MachineDominators.h"
 #include "llvm/CodeGen/MachineFunctionPass.h"
@@ -48,6 +49,7 @@ namespace {
     }
 
     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+      AU.addPreserved<DominatorTree>();
       AU.addPreserved<ProfileInfo>();
     }
   };
-- 
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