maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity
296,584 Commits 23 Branches 0 Tags 2.2 GiB
Commit Graph

3 Commits

Author SHA1 Message Date
Roman Lebedev eb795a0661 [InstCombine] Fold (x >> y) << y -> x & (-1 << y) 
Summary:
We already do it for matching splat constants, but not just values.

Further improvements for non-matching splat constants, as noted in
https://reviews.llvm.org/D46760#1123713 will be needed,
but i'd prefer to do that as a follow-up.

https://bugs.llvm.org/show_bug.cgi?id=37603
https://rise4fun.com/Alive/cplX
https://rise4fun.com/Alive/0HF

Reviewers: spatel, craig.topper

Reviewed By: spatel

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D47981

llvm-svn: 334372
 2018-06-10 20:10:13 +00:00
Roman Lebedev 1e9457ee76 [NFC][InstCombine] Revisit tests for D47980 / D47981 once more. 
llvm-svn: 334370
 2018-06-10 20:10:00 +00:00
Roman Lebedev 8aada65f81 [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://reviews.llvm.org/D46760#1123713
https://rise4fun.com/Alive/cplX

llvm-svn: 334347
 2018-06-09 09:27:43 +00:00