[llvm] r193795 - [ConstantRange] improve my previous patch per Nick suggestion

[Nuno Lopes]

Author: nlopes
Date: Thu Oct 31 14:53:53 2013
New Revision: 193795

URL: http://llvm.org/viewvc/llvm-project?rev=193795&view=rev
Log:
[ConstantRange] improve my previous patch per Nick suggestion

Modified:
    llvm/trunk/lib/Support/ConstantRange.cpp

Modified: llvm/trunk/lib/Support/ConstantRange.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Support/ConstantRange.cpp?rev=193795&r1=193794&r2=193795&view=diff
==============================================================================
--- llvm/trunk/lib/Support/ConstantRange.cpp (original)
+++ llvm/trunk/lib/Support/ConstantRange.cpp Thu Oct 31 14:53:53 2013
@@ -447,7 +447,7 @@ ConstantRange ConstantRange::signExtend(
   assert(SrcTySize < DstTySize && "Not a value extension");
 
   // special case: [X, INT_MIN) -- not really wrapping around
-  if (Upper == APInt::getHighBitsSet(SrcTySize, 1))
+  if (Upper.isMinSignedValue())
     return ConstantRange(Lower.sext(DstTySize), Upper.zext(DstTySize));
 
   if (isFullSet() || isSignWrappedSet()) {