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10 Commits

Author SHA1 Message Date
Zvi Rackover 51f0d64b9c InstSimplify: If divisor element is undef simplify to undef 
Summary:
If any vector divisor element is undef, we can arbitrarily choose it be
zero which would make the div/rem an undef value by definition.

Reviewers: spatel, reames

Reviewed By: spatel

Subscribers: magabari, llvm-commits

Differential Revision: https://reviews.llvm.org/D42485

llvm-svn: 323343
 2018-01-24 17:22:00 +00:00
Sanjay Patel bb1b1c97fa [InstSimplify] fix some test names; NFC 
Too much division...the quotient is the answer.

llvm-svn: 312943
 2017-09-11 20:38:31 +00:00
Sanjay Patel 5876189ff1 [InstSimplify] refactor udiv/urem code and add tests; NFCI 
This removes some duplicated code and makes it easier to support signed div/rem
in a similar way if we want to do that. Note that the existing comments were not
accurate - we don't need a constant divisor to simplify; icmp simplification does
more than that. But as the added tests show, it could go even further.

llvm-svn: 312885
 2017-09-10 17:55:08 +00:00
Sanjay Patel 962a8431ea [InstSimplify] allow folds for bool vector div/rem 
llvm-svn: 297411
 2017-03-09 21:56:03 +00:00
Sanjay Patel 7e56366204 [ConstantFold] vector div/rem with any zero element in divisor is undef 
Follow-up for:
https://reviews.llvm.org/D30665
https://reviews.llvm.org/rL297390

llvm-svn: 297409
 2017-03-09 20:42:30 +00:00
Sanjay Patel bb47616aef [InstSimplify] add tests for vector constant folding div/rem-by-0; NFC 
llvm-svn: 297407
 2017-03-09 20:31:20 +00:00
Sanjay Patel 2b1f6f4b92 [InstSimplify] vector div/rem with any zero element in divisor is undef 
This was suggested as a DAG simplification in the review for rL297026 :
http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20170306/435253.html
...but let's start with IR since we have actual docs for IR (LangRef).

Differential Revision:
https://reviews.llvm.org/D30665

llvm-svn: 297390
 2017-03-09 16:20:52 +00:00
Sanjay Patel 3bbee79d9e [InstSimplify] add tests for vector div/rem with UB potential; NFC 
llvm-svn: 297048
 2017-03-06 18:45:39 +00:00
Sanjay Patel c494239bd8 [InstSimplify] regenerate checks; NFC 
llvm-svn: 297040
 2017-03-06 18:13:01 +00:00
David Majnemer 63da0c238b [InstSimplify] Optimize away udivs in the presence of range metadata 
We know that udiv %V, C can be optimized away to 0 if %V is ult C.

llvm-svn: 291296
 2017-01-06 22:58:02 +00:00