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Message-Id: <p9u033x0sxhq.fsf@thym>
Date: Thu, 30 Jul 2026 10:16:49 +0200
From: Paul Zimmermann <Paul.Zimmermann@...ia.fr>
To: musl@...ts.openwall.com
Subject: issue in acosh

       Hi,

for x=-0x1.34e729fd08086p+21, Musl 1.2.6 yields 0x1.075fa39542c7fp+3
instead of NaN:

$ VERBOSE=-v ./doit.musl acosh 1000
Checking acosh with musl-1.2.6
Using seed 16199
tested 1121438 numbers from extra file
Using 20 thread(s)
acosh 0 -1 -0x1.34e729fd08086p+21 [0] [inf] inf inf
libm gives 0x1.075fa39542c7fp+3
mpfr gives -nan

Paul Zimmermann

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