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From: "bruno at clisp dot org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug math/30998] fesetexceptflag clears too many floating-point
 exception flags on alpha
Date: Tue, 24 Oct 2023 18:24:06 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D30998

--- Comment #2 from Bruno Haible <bruno at clisp dot org> ---
Created attachment 15197
  --> https://sourceware.org/bugzilla/attachment.cgi?id=3D15197&action=3Ded=
it
proposed fix

Find attached a proposed fix.

The bug is obviously in glibc/sysdeps/alpha/fpu/fsetexcptflg.c .
The line

  tmp =3D (tmp & ~SWCR_STATUS_MASK) | (*flagp & excepts & SWCR_STATUS_MASK);

needs to be changed to

  tmp =3D (tmp & ~(excepts & SWCR_STATUS_MASK)) | (*flagp & excepts &
SWCR_STATUS_MASK);

A optimized expression (produces one less instruction when compiled by
"alpha-linux-gnu-gcc -O2") is:

  tmp ^=3D (tmp ^ *flagp) & excepts & SWCR_STATUS_MASK;

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