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Author SHA1 Message Date
Kai Luo 8e6d92026c [DAG][PowerPC] Fix dropped `nsw` flag in `SimplifySetCC` by adding `doesNodeExist` helper 
`SimplifySetCC` invokes `getNodeIfExists` without passing `Flags` argument and `getNodeIfExists` uses a default `SDNodeFlags` to intersect the original flags, as a consequence, flags like `nsw` is dropped. Added a new helper function `doesNodeExist` to check if a node exists without modifying its flags.

Reviewed By: #powerpc, nemanjai

Differential Revision: https://reviews.llvm.org/D89938
 2020-11-25 04:39:03 +00:00
Kai Luo 638fee625d [PowerPC] Add test case for missing `nsw` flag. NFC. 2020-10-20 03:47:49 +00:00