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Author SHA1 Message Date
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 342c3bcf11 [InstCombine] enhance vector demanded elements to look at a vector select condition operand 
I noticed that we were not back-propagating undef lanes to shuffle masks when we have a 
shuffle that reduces the vector width. This is part of investigating/solving PR38691:
https://bugs.llvm.org/show_bug.cgi?id=38691

The DAG equivalent was proposed with:
D51696

Differential Revision: https://reviews.llvm.org/D51433

llvm-svn: 341981
 2018-09-11 18:49:00 +00:00
Sanjay Patel c1416b60f2 [InstCombine] narrow vector select with padded condition and extracted result (PR38691) 
shuf (sel (shuf NarrowCond, undef, WideMask), X, Y), undef, NarrowMask) -->
sel NarrowCond, (shuf X, undef, NarrowMask), (shuf Y, undef, NarrowMask)

The motivating case from:
https://bugs.llvm.org/show_bug.cgi?id=38691
...is the last regression test. In that case, we're just left with the narrow select.

Note that if we do create new shuffles, they use the existing extraction identity mask, 
so there's no danger that this transform creates arbitrary shuffles.

Differential Revision: https://reviews.llvm.org/D51496

llvm-svn: 341708
 2018-09-07 21:03:34 +00:00
Sanjay Patel 3abd9f6bdc [InstCombine] add test for vector demanded elements + shrinking; NFC 
llvm-svn: 340933
 2018-08-29 15:34:19 +00:00
Sanjay Patel 60ffc2e9a4 [InstCombine] fix baseline assertions 
rL340842 contained the wrong version of the check lines.

llvm-svn: 340846
 2018-08-28 17:23:20 +00:00
Sanjay Patel c9756e5a23 [InstCombine] add tests for select narrowing (PR38691); NFC 
llvm-svn: 340842
 2018-08-28 16:45:00 +00:00