Sanjay Patel 92a0389b04 [x86] add special-case lowering for usubsat for pre-SSE4
usubsat X, SMIN --> (X ^ SMIN) & (X s>> BW-1)

This would be a regression with D112085 where we combine to
usubsat more aggressively, so avoid that by matching the
special-case where we are subtracting SMIN (signmask):
https://alive2.llvm.org/ce/z/4_3gBD

Differential Revision: https://reviews.llvm.org/D112095
2021-10-19 17:13:16 -04:00
..
2021-04-13 09:48:13 +08:00
2021-02-15 14:27:12 +08:00
2021-09-17 15:48:55 +02:00
2021-07-27 12:09:25 +01:00
2021-08-16 13:13:56 +01:00
2021-05-24 12:09:02 -07:00
2021-02-21 21:25:26 +00:00