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Author SHA1 Message Date
Igor Laevsky 029bd93c5d [DeadStoreElimination] Remove dead zero store to calloc initialized memory 
This change allows dead store elimination to remove zero and null stores into memory freshly allocated with calloc-like function.

Differential Revision: http://reviews.llvm.org/D13021

llvm-svn: 248374
 2015-09-23 11:38:44 +00:00
Rui Ueyama c487f7728e Revert "r214897 - Remove dead zero store to calloc initialized memory" 
It broke msan.

llvm-svn: 214989
 2014-08-06 19:30:38 +00:00
Philip Reames 00c9b6461f 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.  If the store is to an out of bounds address, it is undefined and thus also removable.

Reviewed By: nicholas

Differential Revision: http://reviews.llvm.org/D3942

llvm-svn: 214897
 2014-08-05 17:48:20 +00:00