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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
Nikita Popov 10edd2b79d [ValueTracking] Use computeConstantRange() in signed add overflow determination 
This is D59386 for the signed add case. The computeConstantRange()
result is now intersected into the existing known bits information,
allowing to detect additional no-overflow/always-overflow conditions
(though the latter isn't used yet).

This (finally...) covers the motivating case from D59071.

Differential Revision: https://reviews.llvm.org/D60420

llvm-svn: 358014
 2019-04-09 16:12:59 +00:00
Nikita Popov 7f15dd097e [InstCombine] Add tests for ssubo X, C -> saddo X, -C; NFC 
Add baseline tests for canonicalization of
ssubo X, C -> saddo X, -C.

Patch by Dan Robertson.

Differential Revision: https://reviews.llvm.org/D59653

llvm-svn: 357013
 2019-03-26 18:05:43 +00:00
Nikita Popov c1d4fc8a62 [InstCombine] Improve with.overflow intrinsic tests; NFC 
- Do not use unnamed values in saddo tests
- Add tests for canonicalization of a constant arg0

Patch by Dan Robertson.

Differential Revision: https://reviews.llvm.org/D59476

llvm-svn: 356403
 2019-03-18 20:08:35 +00:00
Nikita Popov 884feb1b69 [InstCombine] Fold add nsw + sadd.with.overflow 
Fold `add nsw` and `sadd.with.overflow` with constants if the addition
does not overflow.

Part of https://bugs.llvm.org/show_bug.cgi?id=38146.

Patch by Dan Robertson.

Differential Revision: https://reviews.llvm.org/D58881

llvm-svn: 355530
 2019-03-06 18:30:00 +00:00
Nikita Popov 8670faf939 [InstCombine] Add tests for add nsw + sadd.with.overflow; NFC 
Baseline tests for D58881, which fixes part of PR38146.

Patch by Dan Robertson.

llvm-svn: 355328
 2019-03-04 19:35:46 +00:00