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Author SHA1 Message Date
George Burgess IV 7bc507a2e8 Revert r301880 
This change caused buildbot failures, apparently because we're not
passing around types that InstSimplify is used to seeing. I'm not overly
familiar with InstSimplify, so I'm reverting this until I can figure out
what exactly is wrong.

llvm-svn: 301885
 2017-05-01 23:54:41 +00:00
George Burgess IV 6935aefdf0 [InstSimplify] Handle selects of GEPs with 0 offset 
In particular (since it wouldn't fit nicely in the summary):
(select (icmp eq V 0) P (getelementptr P V)) -> (getelementptr P V)

Differential Revision: https://reviews.llvm.org/D31435

llvm-svn: 301880
 2017-05-01 23:12:08 +00:00
Sanjay Patel 5178363687 [InstCombine] if the condition of a select may be known via assumes, eliminate the select 
This is a limited solution for PR31512:
https://llvm.org/bugs/show_bug.cgi?id=31512

The motivation is that we will need to increase usage of llvm.assume and/or metadata to solve PR28430:
https://llvm.org/bugs/show_bug.cgi?id=28430

...and this kind of simplification is needed to take advantage of that extra information.

The 'not' test case would be handled by:
https://reviews.llvm.org/D28485

Differential Revision:
https://reviews.llvm.org/D28337

llvm-svn: 291915
 2017-01-13 17:02:42 +00:00
Sanjay Patel 95faecb766 [InstSimplify] add tests to show missing select simplifications; NFC 
llvm-svn: 291043
 2017-01-05 00:40:52 +00:00
Sanjay Patel e9fc79bb13 [InstSimplify] don't crash handling a pointer or aggregate type 
llvm-svn: 276345
 2016-07-21 21:56:00 +00:00
Sanjay Patel a3bfb4e313 [InstSimplify] recognize trunc + icmp sgt/slt variants of select simplifications (PR28466) 
rL245171 exposed a hole in InstSimplify that manifested in a strange way in PR28466:
https://llvm.org/bugs/show_bug.cgi?id=28466

It's possible to use trunc + icmp sgt/slt in place of an and + icmp eq/ne, so we need to
recognize that pattern to eliminate selects that are choosing between some value and some
bitmasked version of that value.

Note that there is significant room for improvement (refactoring) and enhancement (more
patterns, possibly in InstCombine rather than here).

Differential Revision: https://reviews.llvm.org/D22537

llvm-svn: 276341
 2016-07-21 21:26:45 +00:00
Sanjay Patel 9eec550a2b add vector tests and a simpler version of the negative tests 
llvm-svn: 276328
 2016-07-21 20:11:08 +00:00
Sanjay Patel 5f3c70307d [InstSimplify][InstCombine] don't crash when folding vector selects of icmp 
Differential Revision: https://reviews.llvm.org/D22602

llvm-svn: 276209
 2016-07-20 23:40:01 +00:00
Sanjay Patel 47c04f9543 add even more missing tests for simplifySelectBitTest() 
llvm-svn: 276024
 2016-07-19 20:47:00 +00:00
Sanjay Patel 8b76ebe5b8 add tests related to PR28466 
llvm-svn: 275995
 2016-07-19 17:07:35 +00:00
Sanjay Patel d2ff6d727f add missing test for simplifySelectBitTest() 
llvm-svn: 275990
 2016-07-19 16:49:55 +00:00
Sanjay Patel 8a2bf3099f auto-generate checks 
llvm-svn: 275899
 2016-07-18 20:06:51 +00:00
David Majnemer 0b6a0b0257 InstSimplify: Optimize away pointless comparisons 
(X & INT_MIN) ? X & INT_MAX : X  into  X & INT_MAX
(X & INT_MIN) ? X : X & INT_MAX  into  X
(X & INT_MIN) ? X | INT_MIN : X  into  X
(X & INT_MIN) ? X : X | INT_MIN  into  X | INT_MIN

llvm-svn: 224669
 2014-12-20 03:04:38 +00:00
David Majnemer c6a5e1dd4f InstSimplify: Restore optimizations lost in r210006 
This restores our ability to optimize:
(X & C) ? X & ~C : X  into  X & ~C
(X & C) ? X : X & ~C  into  X
(X & C) ? X | C : X  into  X
(X & C) ? X : X | C  into  X | C

llvm-svn: 222868
 2014-11-27 06:32:46 +00:00