linux-kernel - Re: [PATCH] x86: drop REG_OUT macro from hweight functions

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Date:   Mon, 29 Jul 2019 23:44:17 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: drop REG_OUT macro from hweight functions

On Mon, Jul 29, 2019 at 12:04:47PM +0200, Peter Zijlstra wrote:
> +#define _ASM_ARG1B	__ASM_FORM_RAW(dil)
> +#define _ASM_ARG2B	__ASM_FORM_RAW(sil)
> +#define _ASM_ARG3B	__ASM_FORM_RAW(dl)
> +#define _ASM_ARG4B	__ASM_FORM_RAW(cl)
> +#define _ASM_ARG5B	__ASM_FORM_RAW(r8b)
> +#define _ASM_ARG6B	__ASM_FORM_RAW(r9b)

I preprocessed percpu code once to see what precisely it does because
it was easier than wading through forest of macroes.

Hopefully x86 assembly won't get to that level.