assembly - Why doesn't gas recognize vqmovn on arm64?

Question

I have a 128 bit vector consisting of a comparison mask, eg

ffff 0000 ffff ffff 0000 0000 0000 ffff

My end goal is to transform this into a mask that looks like (one byte, binary)

10110001

I'm trying to do this in ARM assembly.

First thing I want to do is to try and narrow the vector with vqmovn.s16

vqmovn.s16 v0, v0

But the assembler doesn't recognize that instruction.

Error: unknown mnemonic vqmovn.s16

question from:https://stackoverflow.com/questions/65837251/why-doesnt-gas-recognize-vqmovn-on-arm64

Answer 1

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