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

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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

llvm-svn: 256910
This commit is contained in:
Philip Reames 2016-01-06 04:43:03 +00:00
parent f7e04fbc3d
commit 23e3fb6f4a
1 changed files with 5 additions and 3 deletions
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8
lib/Analysis/BasicAliasAnalysis.cpp
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@ -599,9 +599,11 @@ ModRefInfo BasicAAResult::getArgModRefInfo(ImmutableCallSite CS,
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