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From: "hjl.tools at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug math/31335] Compile glibc with -march=x86-64-v3 should disable
 FMA4 multi-arch version
Date: Thu, 04 Apr 2024 13:12:01 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D31335

--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Florian Weimer from comment #3)
> Has this bug been fixed?
>=20
> I ran into this issue while trying to build glibc with -mapxf. This option
> is logically incompatible with -mfma4, although not rejected by GCC. I do=
n't
> expect there to be any hardware that supports this combination, and GCC
> generates assembly that is incompatible with GAS:
>=20
> /tmp/ccuidrGh.s: Assembler messages:
> /tmp/ccuidrGh.s:451: Error: extended GPR cannot be used as base/index for
> `vfmaddsd'
> /tmp/ccuidrGh.s:702: Error: extended GPR cannot be used as base/index for
> `vfmaddsd'
> /tmp/ccuidrGh.s:821: Error: extended GPR cannot be used as base/index for
> `vfmaddsd'
> /tmp/ccuidrGh.s:1449: Error: extended GPR cannot be used as base/index for
> `vfmaddsd'
> /tmp/ccuidrGh.s:1591: Error: extended GPR cannot be used as base/index for
> `vfmaddsd'
> /tmp/ccuidrGh.s:1709: Error: extended GPR cannot be used as base/index for
> `vfmaddsd'

I can't reproduce it with glibc master branch, GCC 14 and binutils 2.42.
What are your configure and build options?

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