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Message-ID: <6269d016-ae8b-324c-3819-222b2b3e3aae@esi.com.au>
Date: Fri, 28 Aug 2026 15:43:38 +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:
> How about the cases as a table, keeping the (y,x) notation the file already
> uses:
>
> /* m: bit 0 is sign(y), bit 1 is sign(x).
> (+,+) z (-,+) -z
> (+,-) pi-(z-pi_lo) (-,-) (z-pi_lo)-pi
> m&2 clear gives +-z, m&2 set gives +-(pi-(z-pi_lo)), sign from y. */
>
> I'm happy either way if Rich has a preference.
Looks easier to read.
Let's see what Rich says.
Thanks - Damian
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