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3 Commits

Author SHA1 Message Date
Nikita Popov 3b671022e4 [InstSimplify] Simplify comparison between zext(x) and sext(x) 
This is picking up a loose thread from D69006: We can simplify
(zext x) ule (sext x) and (zext x) sge (sext x) to true, with
various permutations. Oddly, SCEV knows about this identity,
but nothing on the IR level does.

Differential Revision: https://reviews.llvm.org/D83081
 2020-07-04 11:03:00 +02:00
Nikita Popov 93ccb8eb52 [InstSimplify] Add additional zext/sext comparison tests (NFC) 
Add vector variants, and negative tests where the operand does
not match.
 2020-07-04 11:03:00 +02:00
Nikita Popov 359345d609 [InstSimplify] Add test for sext/zext comparisons (NFC) 2020-07-02 22:21:59 +02:00