From: Paolo Bonzini <pbonzini@redhat.com>
To: Richard Henderson <rth@twiddle.net>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH] tcg-i386: Use MOVBE if available
Date: Sat, 21 Dec 2013 15:08:21 +0100 [thread overview]
Message-ID: <52B5A0D5.4080005@redhat.com> (raw)
In-Reply-To: <1387580412-5828-1-git-send-email-rth@twiddle.net>
Il 21/12/2013 00:00, Richard Henderson ha scritto:
> + if (real_bswap && have_movbe) {
> + tcg_out_modrm_offset(s, OPC_MOVBE_GyMy + P_DATA16 + seg,
> + datalo, base, ofs);
> + tcg_out_ext16u(s, datalo, datalo);
Do partial register stalls still exist on Atom and Haswell? I don't
remember exactly what you had to do to prevent them, but IIRC you first
moved zero to the register and then overwrote the the low 16 bits.
Paolo
next prev parent reply other threads:[~2013-12-21 14:08 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-20 23:00 [Qemu-devel] [PATCH] tcg-i386: Use MOVBE if available Richard Henderson
2013-12-21 14:08 ` Paolo Bonzini [this message]
2013-12-22 12:24 ` Aurelien Jarno
2013-12-22 13:39 ` Paolo Bonzini
2013-12-22 16:38 ` Richard Henderson
2013-12-22 20:03 ` Aurelien Jarno
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