From e1336b4086c523dd7f4c538b0bc582c45bc3f65f Mon Sep 17 00:00:00 2001
From: Reid Spencer <rspencer@reidspencer.com>
Date: Fri, 2 Mar 2007 02:59:25 +0000
Subject: Fix an unequal bitwidth issue.

llvm-svn: 34831
---
 llvm/lib/Analysis/ScalarEvolution.cpp | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

(limited to 'llvm/lib/Analysis')

diff --git a/llvm/lib/Analysis/ScalarEvolution.cpp b/llvm/lib/Analysis/ScalarEvolution.cpp
index 438e42886bf..d2eca4adeb4 100644
--- a/llvm/lib/Analysis/ScalarEvolution.cpp
+++ b/llvm/lib/Analysis/ScalarEvolution.cpp
@@ -1341,9 +1341,12 @@ static APInt GetConstantFactor(SCEVHandle S) {
       return APInt(C->getBitWidth(), 1).shl(C->getBitWidth()-1);
   }
 
-  if (SCEVTruncateExpr *T = dyn_cast<SCEVTruncateExpr>(S))
-    return GetConstantFactor(T->getOperand()) &
-           cast<IntegerType>(T->getType())->getMask();
+  if (SCEVTruncateExpr *T = dyn_cast<SCEVTruncateExpr>(S)) {
+    APInt Mask(cast<IntegerType>(T->getType())->getMask());
+    APInt GCF(GetConstantFactor(T->getOperand()));
+    Mask.zextOrTrunc(GCF.getBitWidth());
+    return GCF & Mask;
+  }
   if (SCEVZeroExtendExpr *E = dyn_cast<SCEVZeroExtendExpr>(S))
     return GetConstantFactor(E->getOperand());
   
-- 
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