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Message-ID: <20151121172417.GU26951@example.net>
Date: Sat, 21 Nov 2015 18:24:18 +0100
From: u-uy74@...ey.se
To: musl@...ts.openwall.com
Subject: for information, gcc-4.2.3 miscompiles musl math
Good to be aware of:
gcc-4.2.3 miscompiles musl math since at least 1.1.6,
tested while targeting i486,
1.0.x seems to have been alright.
The symptom is that sin(larger-than-2*pi) yields large values
like "sin(8.000000) = 21.709544".
Looks like the argument reduction logic has changed in a way
which is not compatible with gcc-4.2.3.
I do not notice any problems while compiling musl with gcc-5.2, nor
have a compelling reason to insist on using gcc-4.2.3 (somebody else
might have though, gcc-4.2.3 is the last one under gpl 2).
Regards,
Rune
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