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Re: [Qemu-devel] Re: Current state of GCC 4 (non-)"support" on x86-64 ?
From: |
Gwenole Beauchesne |
Subject: |
Re: [Qemu-devel] Re: Current state of GCC 4 (non-)"support" on x86-64 ? |
Date: |
Mon, 10 Oct 2005 10:55:26 +0200 (CEST) |
On Sun, 9 Oct 2005, Michel Pelletier wrote:
> A copule others on this thread mentioned that you can compile the kqemu
> module with gcc 4 and the rest of qemu with gcc 3.x. Did this work for
> you? Did it create a performance boost?
I don't think you'd gain much since most of the time is spent in generated
code and synthetic opcodes are similarly generated from gcc3.4 and gcc4.
Paul Brook posted an on-going effort to replace dyngen with a hand-written
code generator that doesn't depend on specific compiler behavior.
BTW, qemu also builds on x86_64 with gcc4 and some patches he posted
earlier too.