[PATCH] Remove dead zero store to calloc initialized memory
listmail at philipreames.com
Tue Jun 10 10:55:58 PDT 2014
On 05/29/2014 11:53 AM, Philip Reames wrote:
> (Again, this doesn't appear to have gone to the commits list. Anyone
> have a clue what's I'm doing wrong here?)
> Remove dead zero store to calloc initialized memory
> Optimize the following IR:
> %1 = tail call noalias i8* @calloc(i64 1, i64 4)
> %2 = bitcast i8* %1 to i32*
> ; This store is dead and should be removed
> store i32 0, i32* %2, align 4
> Memory returned by calloc is guaranteed to be zero initialized. If the
> value being stored is the constant zero (and the store is not
> otherwise observable across threads), we can delete the store.
> Note: I do not have commit rights and will need someone to commit this
> change after review.
> llvm-commits mailing list
> llvm-commits at cs.uiuc.edu
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