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a missed __builtin_object_size case.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122676 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2011-01-01 22:57:31 +00:00
parent 9c8fb9e820
commit 15df04472a
1 changed files with 17 additions and 0 deletions
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17
lib/Target/README.txt
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@ -2074,3 +2074,20 @@ define i1 @g(i32 a) nounwind readnone {
}
//===---------------------------------------------------------------------===//
This code can be seen in viterbi:
%64 = call noalias i8* @malloc(i64 %62) nounwind
...
%67 = call i64 @llvm.objectsize.i64(i8* %64, i1 false) nounwind
%68 = call i8* @__memset_chk(i8* %64, i32 0, i64 %62, i64 %67) nounwind
llvm.objectsize.i64 should be taught about malloc/calloc, allowing it to
fold to %62. This is a security win (overflows of malloc will get caught)
and also a performance win by exposing more memsets to the optimizer.
This occurs several times in viterbi.
//===---------------------------------------------------------------------===//