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Author SHA1 Message Date
Juneyoung Lee 5af8bacc94 [InstSimplify] Add more poison folding optimizations 
This adds more poison folding optimizations to InstSimplify.

Since all binary operators propagate poison, these are fine.

Also, the precondition of `select cond, undef, x` -> `x` is relaxed to allow the case when `x` is undef.

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D104661
 2021-06-23 20:25:24 +09:00
Juneyoung Lee 864dda5fd5 [InstSimplify] Add tests that fold instructions with poison operands (NFC) 2020-12-02 01:01:59 +09:00
Eric Christopher cee313d288 Revert "Temporarily Revert "Add basic loop fusion pass."" 
The reversion apparently deleted the test/Transforms directory.

Will be re-reverting again.

llvm-svn: 358552
 2019-04-17 04:52:47 +00:00
Eric Christopher a863435128 Temporarily Revert "Add basic loop fusion pass." 
As it's causing some bot failures (and per request from kbarton).

This reverts commit r358543/ab70da07286e618016e78247e4a24fcb84077fda.

llvm-svn: 358546
 2019-04-17 02:12:23 +00:00
Sanjay Patel ce3f1915f3 [InstCombine] move/add tests for sub/neg; NFC 
These should all be handled using "dyn_castNegVal",
but that misses vectors with undef elements.

llvm-svn: 344790
 2018-10-19 17:26:22 +00:00