[PATCH 11/25] Simplify vec_merge according to the mask.

[Andrew Stubbs]

On 27/09/18 17:19, Richard Sandiford wrote:
> But we wouldn't recurse for PRE_INC, MEM or ASM_OPERANDS, since they
> have the wrong rtx class.  AFAICT no current unary, binary or ternary
> operator has that level of side-effect (and that's a good thing).

OK, in that case I'll remove it and we can cross that bridge if we come 
to it.

This patch should also address your other concerns.

OK?

Andrew
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