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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 | 1726e2ff15a44ea39b6bc1fb719a459de5656b8b (patch) | |
| tree | 24f4b08344c32fe74c3a6d75d3d0e29793c3fdec /lib/Target/AArch64/AArch64ISelLowering.cpp | |
| parent | d99cefbad17a3680601914ff73a28d3214f91c70 (diff) | |
| download | llvm-1726e2ff15a44ea39b6bc1fb719a459de5656b8b.tar.gz llvm-1726e2ff15a44ea39b6bc1fb719a459de5656b8b.tar.bz2 llvm-1726e2ff15a44ea39b6bc1fb719a459de5656b8b.tar.xz | |
[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.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209930 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/AArch64/AArch64ISelLowering.cpp')
0 files changed, 0 insertions, 0 deletions