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| author | Sanjay Patel <spatel@rotateright.com> | 2018-06-14 19:55:02 +0000 |
|---|---|---|
| committer | Sanjay Patel <spatel@rotateright.com> | 2018-06-14 19:55:02 +0000 |
| commit | f85ca6abee7351aa5d059d7ec241e1ac016c59fb (patch) | |
| tree | 4b7acfdb05ba224862f3f987322e30d0019e5a25 /llvm/lib/Analysis/AliasAnalysisEvaluator.cpp | |
| parent | bfa94d508686c14268d7ce2b2bd094336a7ddf4a (diff) | |
| download | bcm5719-llvm-f85ca6abee7351aa5d059d7ec241e1ac016c59fb.tar.gz bcm5719-llvm-f85ca6abee7351aa5d059d7ec241e1ac016c59fb.zip | |
[x86] be more selective about converting 'and' to shuffle (PR37749)
isVectorClearMaskLegal() is the TLI hook used by the generic
DAGCombiner::XformToShuffleWithZero().
We've grown to accomodate/expect this transform to shuffle
(disabling it more generally results in many regressions).
So I'm narrowly excluding the 256-bit types that clearly
are not worthwhile for AVX1.
I think in most cases we are able to recover by converting
the shuffle back into 'and' ops, but the cases in:
https://bugs.llvm.org/show_bug.cgi?id=37749
...show that there are cracks.
llvm-svn: 334759
Diffstat (limited to 'llvm/lib/Analysis/AliasAnalysisEvaluator.cpp')
0 files changed, 0 insertions, 0 deletions
