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Author SHA1 Message Date
Chad Rosier 32c2178ef3 Add x86-specific DAG combine to simplify: 
x == -y --> x+y == 0
 x != -y --> x+y != 0

On x86, the generated code goes from
   negl    %esi
   cmpl    %esi, %edi
   je    .LBB0_2
to
   addl    %esi, %edi
   je    .L4

This case is correctly handled for ARM with "cmn".

Patch by Manman Ren.
rdar://11245199
PR12545

llvm-svn: 155739
 2012-04-27 22:33:25 +00:00