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2 Commits

Author SHA1 Message Date
Simon Pilgrim f56298f4b9 [X86] Simplify X86ISD::ADD/SUB if we don't use the result flag 
Simplify to the generic ISD::ADD/SUB if we don't make use of the result flag.

This mainly helps with ADDCARRY/SUBBORROW intrinsics which get expanded to X86ISD::ADD/SUB but could be simplified further.

Noticed in some of the test cases in PR31754

Differential Revision: https://reviews.llvm.org/D57234

llvm-svn: 352210
 2019-01-25 15:58:28 +00:00
Simon Pilgrim d41ccddda9 [X86] Add addcarry/subborrow combine tests 
Show failure to simplify cases with zero op/flags

llvm-svn: 352196
 2019-01-25 12:26:27 +00:00