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RE: [Qemu-devel] Performances on Mac OS X

From: Natalia Portillo
Subject: RE: [Qemu-devel] Performances on Mac OS X
Date: Mon, 2 Aug 2004 14:02:48 +0100

GCC supports Altivec, just see the help. 

> -----Mensaje original-----
> De: address@hidden 
> [mailto:address@hidden 
> En nombre de Laurent Amon
> Enviado el: lunes, 02 de agosto de 2004 13:08
> Para: address@hidden
> Asunto: [Qemu-devel] Performances on Mac OS X
> Hello,
> Just to let you know that I have been benchmarking with 
> linux-test/nbench on my Titanium G4/400 and that I have been 
> able to sqeeze a few percents (some 5%) of performance by 
> compiling with -mcpu=7400 wirth GCC 3.3. This is the only 
> flag that seems useful.
> I have also tried -mpowerpc-gpopt, -mpowerpc-gfxopt, 
> -falign-loops, -funroll-loops, -fnew-ra, -ftracer.
> When compiling with -finline-functions, the generated 
> i386-softmmu/op.h is bad, and if you do not use it do compile 
> dyngen, there is no improvement.
> -Os actually decreases performance and I have not been able 
> to generate a profiled  executable with -fprofile-arcs.
> Owners of PPC7450 or of G5 should try the relevant switch.
> I was wondering whether the implementation of qemu is tied to 
> gcc or if it might be interesting to try to compile using 
> IBM's compiler, which is able to generate Altivec code...
> Lga.
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