Messages in this thread | | | Date | Wed, 12 Dec 2007 13:35:21 +0100 | From | Paolo Ornati <> | Subject | Re: [RFT] Port 0x80 I/O speed |
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On 12 Dec 2007 06:20:49 -0500 linux@horizon.com wrote:
> With -O2, the cycle counts come out (before division) as > out: 0xFFFFFFFFFFEA6F4F > in: 0xFFFFFFFFFCE68BB6 > I think the "A" constraint doesn't work quite the same in > 64-bit code. The compiler seems to be using %rdx rather than > %edx:%eax.
In another message he says to compile it with "-m32" :)
-- Paolo Ornati Linux 2.6.24-rc5-g4af75653 on x86_64
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