From fb55b7b99d81aa8a3b5be2fd45487fd71b297637 Mon Sep 17 00:00:00 2001
From: Reid Spencer <rspencer@reidspencer.com>
Date: Sun, 25 Feb 2007 23:54:00 +0000
Subject: Fix sext operation. Shifting by zero would leave an incorrect mask.

llvm-svn: 34617
---
 llvm/lib/Support/APInt.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'llvm/lib/Support')

diff --git a/llvm/lib/Support/APInt.cpp b/llvm/lib/Support/APInt.cpp
index 09a600ffa2c..e13778609bb 100644
--- a/llvm/lib/Support/APInt.cpp
+++ b/llvm/lib/Support/APInt.cpp
@@ -889,7 +889,7 @@ void APInt::sext(uint32_t width) {
     return;
   }
 
-  uint64_t mask = ~0ULL << wordBits;
+  uint64_t mask = wordBits == 0 ? 0 : ~0ULL << wordBits;
   uint64_t *newVal = getMemory(wordsAfter);
   if (wordsBefore == 1)
     newVal[0] = VAL | mask;
-- 
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