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Message-ID: <20190912175725.GC9017@brightrain.aerifal.cx>
Date: Thu, 12 Sep 2019 13:57:25 -0400
From: Rich Felker <dalias@...c.org>
To: info@...ile-stream.com
Cc: musl@...ts.openwall.com
Subject: Re: [PATCH] mips: add single-instruction math functions
On Wed, Sep 11, 2019 at 01:05:04PM +0300, info@...ile-stream.com wrote:
>
> non-commit text:
> gcc puts annoying nop into the delay slot for these functions, e.g.:
> abs.d $f0,$f12
> jr $ra
> nop
> is there any way to get rid of this without using pure .S?
>
>
>
> SQRT.fmt exists on MIPS II+ (float), MIPS III+ (double).
>
> ABS.fmt exists on MIPS I+ but only cores with ABS2008 flag in FCSR
> implement the required behaviour.
One other thing: can you confirm/cite that the mips sqrt instructions
are correctly-rounded? I would assume so but this needs checking since
there have been some low-end fpus that do things wrong (like early
pre-vfp ARM ones).
Rich
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