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| author | Andrea Di Biagio <Andrea_DiBiagio@sn.scee.net> | 2014-11-21 14:32:06 +0000 |
|---|---|---|
| committer | Andrea Di Biagio <Andrea_DiBiagio@sn.scee.net> | 2014-11-21 14:32:06 +0000 |
| commit | 0225b5bf6f7d8603191863530c40592502496a04 (patch) | |
| tree | 8a11628eddc5223c09d9b39a6fdabd91f376c135 /lldb/scripts/Python/buildSwigPython.py | |
| parent | 7a0f81a9b721d14b5c9840ea7d104ed8bf5f870b (diff) | |
| download | bcm5719-llvm-0225b5bf6f7d8603191863530c40592502496a04.tar.gz bcm5719-llvm-0225b5bf6f7d8603191863530c40592502496a04.zip | |
[DAG] Teach how to turn a build_vector into a shuffle if some of the operands are zero.
Before this patch, the DAGCombiner only tried to convert build_vector dag nodes
into shuffles if all operands were either extract_vector_elt or undef.
This patch improves that logic and teaches the DAGCombiner how to deal with
build_vector dag nodes where one or more operands are zero. A build_vector
dag node with some zero operands is turned into a shuffle only if the resulting
shuffle mask is legal for the target.
llvm-svn: 222536
Diffstat (limited to 'lldb/scripts/Python/buildSwigPython.py')
0 files changed, 0 insertions, 0 deletions
