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Author SHA1 Message Date
David Green 0765a4c288 [ARM] Extra qdadd patterns 
This adds some new qdadd patterns to go along with the other recently added
qadd's.

Differential Revision: https://reviews.llvm.org/D68999

llvm-svn: 375414
 2019-10-21 14:06:49 +00:00
David Green d7b77f2203 [ARM] Add qadd lowering from a sadd_sat 
This lowers a sadd_sat to a qadd by treating it as legal. Also adds qsub at the
same time.

The qadd instruction sets the q flag, but we already have many cases where we
do not model this in llvm.

Differential Revision: https://reviews.llvm.org/D68976

llvm-svn: 375411
 2019-10-21 12:33:46 +00:00
David Green 5ba66fa53b [ARM] Add and adjust saturation tests for upcoming qadd changes. NFC 
llvm-svn: 375401
 2019-10-21 09:43:37 +00:00