[llvm] 30a0dbb - [X86] Remove x86_sse42_crc32_64_64 from X86TTIImpl::simplifyDemandedUseBitsIntrinsic

[Craig Topper via llvm-commits]

Author: Craig Topper
Date: 2020-07-30T21:51:23-07:00
New Revision: 30a0dbb70d9e0c94a9bdc3d28e7c1c57d9891912

URL: https://github.com/llvm/llvm-project/commit/30a0dbb70d9e0c94a9bdc3d28e7c1c57d9891912
DIFF: https://github.com/llvm/llvm-project/commit/30a0dbb70d9e0c94a9bdc3d28e7c1c57d9891912.diff

LOG: [X86] Remove x86_sse42_crc32_64_64 from X86TTIImpl::simplifyDemandedUseBitsIntrinsic

It doesn't do any simplifying. It just computes known bits. We
can just let InstCombine call computeKnownBits which will handle
this just as well.

Added: 
    

Modified: 
    llvm/lib/Target/X86/X86InstCombineIntrinsic.cpp

Removed: 
    


################################################################################
diff  --git a/llvm/lib/Target/X86/X86InstCombineIntrinsic.cpp b/llvm/lib/Target/X86/X86InstCombineIntrinsic.cpp
index 91341f93a994..aea355a29731 100644
--- a/llvm/lib/Target/X86/X86InstCombineIntrinsic.cpp
+++ b/llvm/lib/Target/X86/X86InstCombineIntrinsic.cpp
@@ -1785,10 +1785,6 @@ Optional<Value *> X86TTIImpl::simplifyDemandedUseBitsIntrinsic(
     KnownBitsComputed = true;
     break;
   }
-  case Intrinsic::x86_sse42_crc32_64_64:
-    Known.Zero.setBitsFrom(32);
-    KnownBitsComputed = true;
-    break;
   }
   return None;
 }