commit 049d08f5c9e4f9f5c71d8f8d08d846ba15f2ae99
author Eli Friedman <eli.friedman@gmail.com> Mon Mar 05 23:09:40 2012 +0000
committer Eli Friedman <eli.friedman@gmail.com> Mon Mar 05 23:09:40 2012 +0000
tree d485f0f784f5e115de00b93339a29b8ff6495c4d
parent c3384c93c0e4c50da4ad093f08997507f9281c75

Make sure we don't return bits outside the mask in ComputeMaskedBits.  PR12189.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152066 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/ValueTracking.cpp

diff --git a/lib/Analysis/ValueTracking.cpp b/lib/Analysis/ValueTracking.cpp
index b5811f2..b35e207 100644
--- a/lib/Analysis/ValueTracking.cpp
+++ b/lib/Analysis/ValueTracking.cpp
@@ -691,8 +691,8 @@
       if (P->hasConstantValue() == P)
         break;
 
-      KnownZero = APInt::getAllOnesValue(BitWidth);
-      KnownOne = APInt::getAllOnesValue(BitWidth);
+      KnownZero = Mask;
+      KnownOne = Mask;
       for (unsigned i = 0, e = P->getNumIncomingValues(); i != e; ++i) {
         // Skip direct self references.
         if (P->getIncomingValue(i) == P) continue;