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Re: Looking for processor specific performance CFLAGS macro
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From: |
Kevin Ryde |
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Subject: |
Re: Looking for processor specific performance CFLAGS macro |
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Date: |
Sun, 20 Jun 2004 08:37:27 +1000 |
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User-agent: |
Gnus/5.110003 (No Gnus v0.3) Emacs/21.3 (gnu/linux) |
Yasunari Tosa <address@hidden> writes:
>
> I'm looking for autoconf macro to set processor specific performance CFLAGS.
GMP does some hairy stuff to establish good defaults.
> Here I restrict myself only to Linux at this point.
It must be difficult using just a kernel, perhaps you mean GNU/Linux.
> I initially thought to use "uname -p", but this returns i686 for P4 and
> surprizing "unknown" for Redhat 7.3 with smp kernel.
On x86, running the cpuid insn is good.
But remember probing the build system is wrong when cross-compiling,
so you'll want a way to specify manually as well as probing.
> I have no idea about how I can get this info from MacOSX.
The "machine" command in recent versions, or the NXGetLocalArchInfo()
call.