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Message-ID: <bd622b26-64b-31fb-9da-c1d8c5aafa4a@esi.com.au>
Date: Fri, 28 Aug 2026 15:17:55 +1000 (AEST)
From: Damian McGuckin <damianm@....com.au>
To: musl@...ts.openwall.com
Subject: Re: [PATCH] math: avoid four-way quadrant branch in
atan2/atan2f
On Fri, 28 Aug 2026, Alex A wrote:
> Thanks, I left it out since it stays in the history, but i can make the
> comment give the mapping if that reads better:
>
> /* m: bit 0 is sign(y), bit 1 is sign(x). m&2 clear gives +-z,
> m&2 set gives +-(pi - (z - pi_lo)), sign from y. */
This is great and needs to be in there. But switch statement corresponds
to how one would describe the quadrants mathematically so I would have the
switch code in the comments as well.
Thanks - Damian
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