[llvm] r240521 - Hexagon: Avoid left shifting negative values (it's UB)

[Justin Bogner]

Author: bogner
Date: Wed Jun 24 01:00:53 2015
New Revision: 240521

URL: http://llvm.org/viewvc/llvm-project?rev=240521&view=rev
Log:
Hexagon: Avoid left shifting negative values (it's UB)

Found by ubsan.

Modified:
    llvm/trunk/lib/Target/Hexagon/MCTargetDesc/HexagonShuffler.h

Modified: llvm/trunk/lib/Target/Hexagon/MCTargetDesc/HexagonShuffler.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/Hexagon/MCTargetDesc/HexagonShuffler.h?rev=240521&r1=240520&r2=240521&view=diff
==============================================================================
--- llvm/trunk/lib/Target/Hexagon/MCTargetDesc/HexagonShuffler.h (original)
+++ llvm/trunk/lib/Target/Hexagon/MCTargetDesc/HexagonShuffler.h Wed Jun 24 01:00:53 2015
@@ -34,7 +34,7 @@ public:
   HexagonResource(unsigned s) { setUnits(s); };
 
   void setUnits(unsigned s) {
-    Slots = s & ~(-1 << HEXAGON_PACKET_SIZE);
+    Slots = s & ~(~0U << HEXAGON_PACKET_SIZE);
     setWeight(s);
   };
   unsigned setWeight(unsigned s);