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| -rw-r--r-- | lib/Target/README.txt | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/lib/Target/README.txt b/lib/Target/README.txt index be0e6bb82e..4e374e59d6 100644 --- a/lib/Target/README.txt +++ b/lib/Target/README.txt @@ -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. + +//===---------------------------------------------------------------------===// + + |