maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity
364,815 Commits 23 Branches 0 Tags 2.2 GiB
Commit Graph

9 Commits

Author SHA1 Message Date
Sanjay Patel e6b6787d01 [InstCombine] fold abs(X)/X to cmp+select 
The backend can convert the select-of-constants to
bit-hack shift+logic if desirable.

https://alive2.llvm.org/ce/z/pgJT6E

  define i8 @src(i8 %x) {
  %0:
    %a = abs i8 %x, 1
    %d = sdiv i8 %x, %a
    ret i8 %d
  }
  =>
  define i8 @tgt(i8 %x) {
  %0:
    %cond = icmp sgt i8 %x, 255
    %r = select i1 %cond, i8 1, i8 255
    ret i8 %r
  }
  Transformation seems to be correct!
 2020-08-17 08:01:28 -04:00
Sanjay Patel 61512ddd2d [InstCombine] add tests for sdiv-of-abs; NFC 2020-08-17 08:01:27 -04:00
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
Chen Zheng 5e13ff1da2 [InstCombine] Canonicalize (-X s/ Y) to -(X s/ Y). 
Differential Revision: https://reviews.llvm.org/D60395

llvm-svn: 358050
 2019-04-10 06:52:09 +00:00
Nikita Popov 2f5e9de8d1 Revert "[InstCombine] [InstCombine] Canonicalize (-X s/ Y) to -(X s/ Y)." 
This reverts commit 1383a91689.

sdiv-canonicalize.ll fails after this revision. The fold needs to be
moved outside the branch handling constant operands. However when this
is done there are further test changes, so I'm reverting this in the
meantime.

llvm-svn: 358026
 2019-04-09 18:32:38 +00:00
Chen Zheng 1383a91689 [InstCombine] [InstCombine] Canonicalize (-X s/ Y) to -(X s/ Y). 
Differential Revision: https://reviews.llvm.org/D60395

llvm-svn: 358017
 2019-04-09 16:34:31 +00:00
Chen Zheng 11cf397292 [InstCombine] add more testcases for canonicalize (-X s/ Y) to -(X s/ Y). 
llvm-svn: 358000
 2019-04-09 12:47:29 +00:00
Chen Zheng c84107612a [InstCombine]add testcase for sdiv canonicalizetion - NFC 
llvm-svn: 357883
 2019-04-08 03:07:32 +00:00