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rewhitening
2016 Oct 28
1
Vector Shuffle chain lowering to X86 instructions simplification inconsistencies
...shuffle sequence
containing types of 128 wide gets reduced a single shuffle, where as the
second shuffle sequence containing types of 256 wide doesn't get reduced to
a single shuffle instruction in the resulting X86 code (Shuffle.s attached).
The second sequence is identical to first and is a rewidening of the
sequence for a higher vector length.
Can this be explained and where in the machine lowering passes does this
simplification happen?
Thanks
--
Kind regards,
Charith Mendis
Graduate Student,
CSAIL,
Massachusetts Institute of Technology
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