[llvm-commits] [llvm] r131861 - /llvm/trunk/lib/Analysis/ValueTracking.cpp

[Evan Cheng]

Author: evancheng
Date: Sun May 22 13:25:30 2011
New Revision: 131861

URL: http://llvm.org/viewvc/llvm-project?rev=131861&view=rev
Log:
Teach ValueTracking about x86 crc32 intrinsics.

Modified:
    llvm/trunk/lib/Analysis/ValueTracking.cpp

Modified: llvm/trunk/lib/Analysis/ValueTracking.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/ValueTracking.cpp?rev=131861&r1=131860&r2=131861&view=diff
==============================================================================
--- llvm/trunk/lib/Analysis/ValueTracking.cpp (original)
+++ llvm/trunk/lib/Analysis/ValueTracking.cpp Sun May 22 13:25:30 2011
@@ -670,6 +670,10 @@
         KnownZero = APInt::getHighBitsSet(BitWidth, BitWidth - LowBits);
         break;
       }
+      case Intrinsic::x86_sse42_crc64_8:
+      case Intrinsic::x86_sse42_crc64_64:
+        KnownZero = APInt::getHighBitsSet(64, 32);
+        break;
       }
     }
     break;