[PATCH] Remove dead zero store to calloc initialized memory

[Philip Reames]

ping.

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
>
> http://reviews.llvm.org/D3942
>
> 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.
>
> Philip
>
>
>
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