From: Reid Spencer <rspencer@reidspencer.com>
Date: Thu, 15 Feb 2007 20:49:10 +0000 (+0000)
Subject: Fix an off-by-one bug in computing the index of the word to clear.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=f1f007d2ffeb5534070208938aaa7f3065d70f61;p=oota-llvm.git

Fix an off-by-one bug in computing the index of the word to clear.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34326 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/llvm/ADT/BitVector.h b/include/llvm/ADT/BitVector.h
index 39819ee5c82..79c3f585677 100644
--- a/include/llvm/ADT/BitVector.h
+++ b/include/llvm/ADT/BitVector.h
@@ -292,7 +292,10 @@ private:
   void clear_unused_bits() {
     if (Size) {
       unsigned ExtraBits = Size % BITS_PER_WORD;
-      Bits[Size / BITS_PER_WORD] &= ~(~0 << ExtraBits);
+      unsigned index = Size / BITS_PER_WORD;
+      if (Size % BITS_PER_WORD == 0)
+        index--;
+      Bits[index] &= ~(~0 << ExtraBits);
     }
   }