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9 Commits

Author SHA1 Message Date
Sanjay Patel 93e64dd9a1 [PatternMatch] allow undef elements when matching vector FP +0.0 
This continues the FP constant pattern matching improvements from:
https://reviews.llvm.org/rL327627
https://reviews.llvm.org/rL327339
https://reviews.llvm.org/rL327307

Several integer constant matchers also have this ability. I'm
separating matching of integer/pointer null from FP positive zero
and renaming/commenting to make the functionality clearer.

llvm-svn: 328461
 2018-03-25 21:16:33 +00:00
Sanjay Patel c84b48ec29 [InstSimplify, InstCombine] add/update tests with FP +0.0 vector with undef; NFC 
llvm-svn: 328455
 2018-03-25 17:48:20 +00:00
Sanjay Patel 6840c5ff75 [ValueTracking, InstCombine] canonicalize fcmp ord/uno with non-NAN ops to null constants 
This is a preliminary step towards solving the remaining part of PR27145 - IR for isfinite():
https://bugs.llvm.org/show_bug.cgi?id=27145

In order to solve that one more generally, we need to add matching for and/or of fcmp ord/uno
with a constant operand.

But while looking at those patterns, I realized we were missing a canonicalization for nonzero
constants. Rather than limiting to just folds for constants, we're adding a general value
tracking method for this based on an existing DAG helper.

By transforming everything to 0.0, we can simplify the existing code in foldLogicOfFCmps()
and pick up missing vector folds.

Differential Revision: https://reviews.llvm.org/D37427

llvm-svn: 312591
 2017-09-05 23:13:13 +00:00
Sanjay Patel 18e126e5d4 [InstCombine] add nnan tests; NFC 
As suggested in D37427, we could have a value tracking function and folds that use
it to simplify these cases. 

llvm-svn: 312578
 2017-09-05 21:20:35 +00:00
Sanjay Patel 661beccdd9 [InstCombine] add tests for fcmp ord/uno canonicalization; NFC 
Currently, we canonicalize some cases to use 0.0, but we miss others.

llvm-svn: 312445
 2017-09-03 15:35:10 +00:00
Sanjay Patel 8ae3630fee [InstCombine] put 2 related tests in the same file; NFC 
llvm-svn: 312412
 2017-09-02 14:35:18 +00:00
Sanjay Patel 16019c5a68 [InstSimplify] move fcmp simplification tests from InstCombine 
These are all tests that result in a constant, so moving the tests over to where they are actually handled.

llvm-svn: 312411
 2017-09-02 14:27:00 +00:00
Sanjay Patel 51dc83c052 regenerate checks 
llvm-svn: 271841
 2016-06-05 17:29:45 +00:00
Dan Gohman 754e4a9801 Constant-fold certain comparisons with infinity and negative infinity. 
llvm-svn: 96777
 2010-02-22 04:06:03 +00:00