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5 Commits

Author SHA1 Message Date
Tim Shen a064622bd3 Re-apply "[SCEV] Strengthen StrengthenNoWrapFlags (reapply r334428)." 
llvm-svn: 337075
 2018-07-13 23:58:46 +00:00
Tim Shen 2ed501d656 Revert "[SCEV] Strengthen StrengthenNoWrapFlags (reapply r334428)." 
This reverts commit r336140. Our tests shows that LSR assert fails with it.

llvm-svn: 336473
 2018-07-06 23:20:35 +00:00
Tim Shen c7cef4bcc4 [SCEV] Strengthen StrengthenNoWrapFlags (reapply r334428). 
Summary:
Comment on Transforms/LoopVersioning/incorrect-phi.ll: With the change
SCEV is able to prove that the loop doesn't wrap-self (due to zext i16
to i64), disabling the entire loop versioning pass. Removed the zext and
just use i64.

Reviewers: sanjoy

Subscribers: jlebar, hiraditya, javed.absar, bixia, llvm-commits

Differential Revision: https://reviews.llvm.org/D48409

llvm-svn: 336140
 2018-07-02 20:01:54 +00:00
Sanjoy Das 6e9b355cc9 Revert "[SCEV] Add nuw/nsw to mul ops in StrengthenNoWrapFlags" 
This reverts r334428.  It incorrectly marks some multiplications as nuw.  Tim
Shen is working on a proper fix.

Original commit message:

[SCEV] Add nuw/nsw to mul ops in StrengthenNoWrapFlags where safe.

Summary:
Previously we would add them for adds, but not multiplies.

llvm-svn: 335016
 2018-06-19 04:09:44 +00:00
Justin Lebar 4da41c13a5 [SCEV] Add transform zext((A * B * ...)<nuw>) --> (zext(A) * zext(B) * ...)<nuw>. 
Reviewers: sanjoy

Subscribers: hiraditya, llvm-commits

Differential Revision: https://reviews.llvm.org/D48041

llvm-svn: 334429
 2018-06-11 18:57:58 +00:00