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| author | Andrea Di Biagio <Andrea_DiBiagio@sn.scee.net> | 2014-05-30 23:17:53 +0000 |
|---|---|---|
| committer | Andrea Di Biagio <Andrea_DiBiagio@sn.scee.net> | 2014-05-30 23:17:53 +0000 |
| commit | 446a52790583890ef14c32f816bc341d68d54453 (patch) | |
| tree | f6ac578b4d474655179af433f7181079afd09a43 /llvm/lib/Support/FileOutputBuffer.cpp | |
| parent | 82111f12fb0d36e329c09022da0f0b48034c6cd3 (diff) | |
| download | llvm-446a52790583890ef14c32f816bc341d68d54453.zip llvm-446a52790583890ef14c32f816bc341d68d54453.tar.gz llvm-446a52790583890ef14c32f816bc341d68d54453.tar.bz2 | |
[X86] Add two combine rules to simplify dag nodes introduced during type legalization when promoting nodes with illegal vector type.
This patch teaches the backend how to simplify/canonicalize dag node
sequences normally introduced by the backend when promoting certain dag nodes
with illegal vector type.
This patch adds two new combine rules:
1) fold (shuffle (bitcast (BINOP A, B)), Undef, <Mask>) ->
(shuffle (BINOP (bitcast A), (bitcast B)), Undef, <Mask>)
2) fold (BINOP (shuffle (A, Undef, <Mask>)), (shuffle (B, Undef, <Mask>))) ->
(shuffle (BINOP A, B), Undef, <Mask>).
Both rules are only triggered on the type-legalized DAG.
In particular, rule 1. is a target specific combine rule that attempts
to sink a bitconvert into the operands of a binary operation.
Rule 2. is a target independet rule that attempts to move a shuffle
immediately after a binary operation.
llvm-svn: 209930
Diffstat (limited to 'llvm/lib/Support/FileOutputBuffer.cpp')
0 files changed, 0 insertions, 0 deletions