[llvm-commits] [llvm] r145249 - /llvm/trunk/include/llvm/ADT/APInt.h

[Benjamin Kramer]

Author: d0k
Date: Mon Nov 28 10:56:38 2011
New Revision: 145249

URL: http://llvm.org/viewvc/llvm-project?rev=145249&view=rev
Log:
Handle more cases in APInt::getLowBitsSet's fast path.

Modified:
    llvm/trunk/include/llvm/ADT/APInt.h

Modified: llvm/trunk/include/llvm/ADT/APInt.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/ADT/APInt.h?rev=145249&r1=145248&r2=145249&view=diff
==============================================================================
--- llvm/trunk/include/llvm/ADT/APInt.h (original)
+++ llvm/trunk/include/llvm/ADT/APInt.h Mon Nov 28 10:56:38 2011
@@ -497,8 +497,8 @@
     if (loBitsSet == APINT_BITS_PER_WORD)
       return APInt(numBits, -1ULL);
     // For small values, return quickly.
-    if (numBits < APINT_BITS_PER_WORD)
-      return APInt(numBits, (1ULL << loBitsSet) - 1);
+    if (loBitsSet <= APINT_BITS_PER_WORD)
+      return APInt(numBits, -1ULL >> (APINT_BITS_PER_WORD - loBitsSet));
     return getAllOnesValue(numBits).lshr(numBits - loBitsSet);
   }