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David Green c1a15ae1a8 [ARM] Combines for VMOVN
This adds two combines for VMOVN, one to fold
VMOVN[tb](c, VQMOVNb(a, b)) => VQMOVN[tb](c, b)
The other to perform demand bits analysis on the lanes of a VMOVN. We
know that only the bottom lanes of the second operand and the top or
bottom lanes of the Qd operand are needed in the result, depending on if
the VMOVN is bottom or top.

Differential Revision: https://reviews.llvm.org/D77718
2020-05-16 15:13:16 +01:00
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