Use UnknownBIts[BitWidth-1] instead of UnknownBIts & SignBits.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35418 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index 728880919501a7e47c86829349f8e9f1fde5fb7c..1c39f050f5013603b60ecc3d653300433035c3a8 100644 (file)
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -851,7 +851,7 @@ static void ComputeSignedMinMaxValuesFromKnownBits(const Type *Ty,
   Min = KnownOne;
   Max = KnownOne|UnknownBits;
   
-  if ((SignBit & UnknownBits) != 0) { // Sign bit is unknown
+  if (UnknownBits[BitWidth-1]) { // Sign bit is unknown
     Min |= SignBit;
     Max &= ~SignBit;
   }