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Re: [Qemu-arm] [PATCH 2/2] target/arm: Use tcg_gen_gvec_bitsel

From: Richard Henderson
Subject: Re: [Qemu-arm] [PATCH 2/2] target/arm: Use tcg_gen_gvec_bitsel
Date: Thu, 23 May 2019 09:16:21 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1

On 5/23/19 9:08 AM, Peter Maydell wrote:
>> Because the three different instructions perform the same operation with
>> reshuffled register arguments.
> Ah, so they do. Next question, how do I find out what the
> order of arguments in the above code means so I can compare
> it against the pseudocode expression we're implementing?

>From tcg/README:

* bitsel_vec v0, v1, v2, v3

  Bitwise select, v0 = (v2 & v1) | (v3 & ~v1), across the entire vector.

The "selector" is second, the first input operand.


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