Michael Kuperstein 3e06eafc20 [DAG] Remove isVectorClearMaskLegal() check from vector_build dagcombine ...

This check currently doesn't seem to do anything useful on any in-tree target:
On non-x86, it always evaluates to false, so we never hit the code path that
creates the shuffle with zero.
On x86, it just forwards to isShuffleMaskLegal(), which is a reasonable thing to
query in general, but doesn't make sense if only restricted to zero blends.

Differential Revision: https://reviews.llvm.org/D24625

llvm-svn: 282567

2016-09-28 06:13:58 +00:00

1.6 KiB

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