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Author SHA1 Message Date
Nikita Popov fb063c933f [InstCombine] Duplicate tests for logical and/or (NFC) 
This replicates existing and/or tests to also test variants using
select. This should help us get a more accurate view on which
optimizations we're missing if we disable the select -> and/or
fold.
 2021-01-12 21:50:41 +01:00
Sanjay Patel 62da6ecea2 [InstCombine] substitute equivalent constant to reduce logic-of-icmps 
(X == C) && (Y Pred1 X) --> (X == C) && (Y Pred1 C)
(X != C) || (Y Pred1 X) --> (X != C) || (Y Pred1 C)

This cooperates/overlaps with D78430, but it is a more general transform
that gets us most of the expected simplifications and several other
improvements.
http://volta.cs.utah.edu:8080/z/5gxjjc

PR45618:
https://bugs.llvm.org/show_bug.cgi?id=45618

Differential Revision: https://reviews.llvm.org/D78582
 2020-04-23 10:19:16 -04:00
Sanjay Patel 44a8c5410e [InstCombine] add tests for logic-of-icmps; NFC 
These are mostly replicated from D78430 (instsimplify).
If we implement more general transforms for instcombine,
then we probably don't need to add that complexity to instsimplify.
 2020-04-21 12:26:45 -04:00