From a7a841adb89efa6ad3b35e9d4bcccccfb8ca146a Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Fri, 4 Mar 2011 20:46:46 +0000
Subject: When decling to reuse existing expressions that involve casts, ignore
 bitcasts, which are really no-ops here. This fixes slowdowns on
 MultiSource/Applications/aha and others.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127031 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Analysis/ScalarEvolutionExpander.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'lib/Analysis/ScalarEvolutionExpander.cpp')

diff --git a/lib/Analysis/ScalarEvolutionExpander.cpp b/lib/Analysis/ScalarEvolutionExpander.cpp
index f2d23c4be7..76a94ea274 100644
--- a/lib/Analysis/ScalarEvolutionExpander.cpp
+++ b/lib/Analysis/ScalarEvolutionExpander.cpp
@@ -859,7 +859,7 @@ SCEVExpander::getAddRecExprPHILiterally(const SCEVAddRecExpr *Normalized,
         // to be.
         do {
           if (IncV->getNumOperands() == 0 || isa<PHINode>(IncV) ||
-              isa<CastInst>(IncV)) {
+              (isa<CastInst>(IncV) && !isa<BitCastInst>(IncV))) {
             IncV = 0;
             break;
           }
-- 
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