[llvm] r256910 - [BasicAA] Delete dead code related to memset/memcpy/memmove intrinsics [NFCI]

[Philip Reames via llvm-commits]

Author: reames
Date: Tue Jan  5 22:43:03 2016
New Revision: 256910

URL: http://llvm.org/viewvc/llvm-project?rev=256910&view=rev
Log:
[BasicAA] Delete dead code related to memset/memcpy/memmove intrinsics [NFCI]

We only need to describe the writeonly property of one of the arguments. All of the rest of the semantics are nicely described by existing attributes in Intrinsics.td.

Differential Revision: http://reviews.llvm.org/D15880


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

Modified: llvm/trunk/lib/Analysis/BasicAliasAnalysis.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/BasicAliasAnalysis.cpp?rev=256910&r1=256909&r2=256910&view=diff
==============================================================================
--- llvm/trunk/lib/Analysis/BasicAliasAnalysis.cpp (original)
+++ llvm/trunk/lib/Analysis/BasicAliasAnalysis.cpp Tue Jan  5 22:43:03 2016
@@ -599,9 +599,11 @@ ModRefInfo BasicAAResult::getArgModRefIn
     case Intrinsic::memset:
     case Intrinsic::memcpy:
     case Intrinsic::memmove:
-      assert((ArgIdx == 0 || ArgIdx == 1) &&
-             "Invalid argument index for memory intrinsic");
-      return ArgIdx ? MRI_Ref : MRI_Mod;
+      // We don't currently have a writeonly attribute.  All other properties
+      // of these intrinsics are nicely described via attributes in
+      // Intrinsics.td and handled generically below.
+      if (ArgIdx == 0)
+        return MRI_Mod;
     }
 
   // We can bound the aliasing properties of memset_pattern16 just as we can