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Re: [Qemu-devel] [PATCH] Enabled building of x86_64 code on Mac OS X
From: |
Laurent Desnogues |
Subject: |
Re: [Qemu-devel] [PATCH] Enabled building of x86_64 code on Mac OS X |
Date: |
Tue, 27 Jan 2009 16:00:32 +0100 |
On Tue, Jan 27, 2009 at 10:21 AM, Alexander Graf <address@hidden> wrote:
>
> The extra registers should speed up things quite a bit. While that's not
> too much of a problem when emulating x86, which has few registers
> anyway, emulating a ppc or x86_64 target should be faster on an x86_64
> host. I haven't done measurements though.
>
> As for the plus in code size on x86_64 - that doesn't really apply to
> tcg, as that still generates 32-bit code when only 32-bit code is
> necessary, which still looks the same on x86_64. Plus it does simplify
> 64-bit operations.
>
> I would be very surprised if the improvement of emulating x86_64 on x86
> vs. x86_64 is only ~10%.
Here is a quick result for user mode.
x on y means running an target x on host y (the host is the same,
I just forced --cpu=i386 when compiling qemu).
Host: CentOS 5.2 x86_64, E6600 (2.4GHz)
Benchmark: Spec2k gcc/integrate (compiled with gcc 4.1.2 -O2)
i386 on x86_64
gen code size 4005696/33497088
TB count 30704/524288
real 0m24.983s/user 0m24.834s
x86_64 on x86_64
gen code size 4413408/33497088
TB count 30247/524288
real 0m24.932s/user 0m24.749s
i386 on i386
gen code size 3439008/33497088
TB count 30704/524288
real 0m26.391s/user 0m26.131s
x86_64 on i386
gen code size 5715248/33497088
TB count 30254/524288
real 0m28.233s/user 0m27.985s
Laurent
- [Qemu-devel] [PATCH] Enabled building of x86_64 code on Mac OS X, Alexander Graf, 2009/01/24
- Re: [Qemu-devel] [PATCH] Enabled building of x86_64 code on Mac OS X, Anthony Liguori, 2009/01/26
- Re: [Qemu-devel] [PATCH] Enabled building of x86_64 code on Mac OS X, Paul Brook, 2009/01/26
- Re: [Qemu-devel] [PATCH] Enabled building of x86_64 code on Mac OS X, Jamie Lokier, 2009/01/26
- Re: [Qemu-devel] [PATCH] Enabled building of x86_64 code on Mac OS X, Paul Brook, 2009/01/26
- Re: [Qemu-devel] [PATCH] Enabled building of x86_64 code on Mac OS X, Anthony Liguori, 2009/01/26
- Re: [Qemu-devel] [PATCH] Enabled building of x86_64 code on Mac OS X, Alexander Graf, 2009/01/27
- Re: [Qemu-devel] [PATCH] Enabled building of x86_64 code on Mac OS X, Jamie Lokier, 2009/01/27
- Re: [Qemu-devel] [PATCH] Enabled building of x86_64 code on Mac OS X,
Laurent Desnogues <=
Re: [Qemu-devel] [PATCH] Enabled building of x86_64 code on Mac OS X, C . W . Betts, 2009/01/26