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Author SHA1 Message Date
Eric Christopher
a62270de2c 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
71d1cca7ef 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
Roman Lebedev
58147abfa7 [InstCombine] Recommit: Fold (x << y) >> y -> x & (-1 >> y) 
Summary:
We already do it for splat constants, but not just values.
Also, undef cases are mostly non-functional.

The original commit was reverted because
it broke tests for amdgpu backend, which i didn't check.
Now, the backed was updated to recognize these new
patterns, so we are good.

https://bugs.llvm.org/show_bug.cgi?id=37603
https://rise4fun.com/Alive/cplX

Reviewers: spatel, craig.topper, mareko, bogner, rampitec, nhaehnle, arsenm

Reviewed By: spatel, rampitec, nhaehnle

Subscribers: wdng, nhaehnle, llvm-commits

Differential Revision: https://reviews.llvm.org/D47980

llvm-svn: 334818
 2018-06-15 09:56:52 +00:00
Roman Lebedev
04c20d128a Revert rL334371 / D47980: "[InstCombine] Fold (x << y) >> y -> x & (-1 >> y)" 
test/Transforms/InstCombine/AMDGPU/amdgcn-intrinsics.ll broke,
and i did not notice because i did not build that backend.

llvm-svn: 334373
 2018-06-10 20:32:03 +00:00
Roman Lebedev
3dbe53a0e4 [InstCombine] Fold (x << y) >> y -> x & (-1 >> y) 
Summary:
We already do it for splat constants, but not just values.
Also, undef cases are mostly non-functional.

https://bugs.llvm.org/show_bug.cgi?id=37603
https://rise4fun.com/Alive/cplX

Reviewers: spatel, craig.topper

Reviewed By: spatel

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D47980

llvm-svn: 334371
 2018-06-10 20:10:06 +00:00
Roman Lebedev
4e44524981 [NFC][InstCombine] Revisit tests for D47980 / D47981 once more. 
llvm-svn: 334370
 2018-06-10 20:10:00 +00:00
Roman Lebedev
46a4ee3296 [NFC][InstCombine] Tests for (x << y) >> y -> x & (-1 >> y) fold. 
We already do it for splat constants, but not just values.
Also, undef cases are mostly non-functional.

https://bugs.llvm.org/show_bug.cgi?id=37603
https://rise4fun.com/Alive/cplX

llvm-svn: 334346
 2018-06-09 09:27:39 +00:00