From: Samuel Tardieu <samuel.tardieu@telecom-paris.fr>
To: Petr Cvek <petrcvekcz@gmail.com>
Cc: pbonzini@redhat.com, marcel.apfelbaum@gmail.com, mst@redhat.com,
qemu-devel@nongnu.org
Subject: Re: [PATCH] qemu/timer: Don't use RDTSC on i486
Date: Sun, 26 Nov 2023 13:37:44 +0100 [thread overview]
Message-ID: <87msv065vx.fsf@telecom-paris.fr> (raw)
In-Reply-To: <6826113a-d428-401e-b5a3-56ad5d8fbaa4@gmail.com>
Petr Cvek <petrcvekcz@gmail.com> writes:
> GCC defines __i386__ for i386 and i486, which both lack RDTSC
> instruction.
> The i386 seems to be impossible to distinguish, but i486 can be
> identified
> by checking for undefined __i486__.
Couldn't you check for an undefined __tune_i386__, which would be
set by both GCC and LLVM when using -march=i386.
Sam
--
Samuel Tardieu
Télécom Paris - Institut Polytechnique de Paris
next prev parent reply other threads:[~2023-11-26 12:45 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-25 12:23 [PATCH] qemu/timer: Don't use RDTSC on i486 Petr Cvek
2023-11-26 12:37 ` Samuel Tardieu [this message]
2023-11-26 12:59 ` Petr Cvek
2023-11-26 13:03 ` Samuel Tardieu
2023-11-26 22:49 ` Petr Cvek
2023-11-26 15:56 ` Paolo Bonzini
2023-11-26 22:52 ` Petr Cvek
2023-11-28 15:52 ` Richard Henderson
2023-11-29 13:50 ` Petr Cvek
2023-11-29 14:27 ` Richard Henderson
2023-11-27 9:49 ` Peter Maydell
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