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Date: Wed, 28 Jun 2006 08:43:20 -0700
From: Richard Henderson <rth@twiddle.net>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: linux-kernel@vger.kernel.org, klibc@zytor.com
Subject: Re: [klibc 04/31] alpha support for klibc
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	linux-kernel@vger.kernel.org, klibc@zytor.com
References: <klibc.200606272217.00@tazenda.hos.anvin.org> <klibc.200606272217.04@tazenda.hos.anvin.org>
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On Tue, Jun 27, 2006 at 10:17:04PM -0700, H. Peter Anvin wrote:
> +# Special CFLAGS for the divide code
> +DIVCFLAGS = $(KLIBCREQFLAGS) $(KLIBCARCHREQFLAGS) \
> +	-O3 -fomit-frame-pointer -fcall-saved-1 -fcall-saved-2 \
> +	-fcall-saved-3 -fcall-saved-4 -fcall-saved-5 -fcall-saved-6 \
> +	-fcall-saved-7 -fcall-saved-8 -ffixed-15 -fcall-saved-16 \
> +	-fcall-saved-17 -fcall-saved-18 -fcall-saved-19 -fcall-saved-20 \
> +	-fcall-saved-21 -fcall-saved-22 -ffixed-23 -fcall-saved-24 \
> +	-ffixed-25 -ffixed-27

These routines absolutely cannot be written in C.  The return value
goes in a different register, which you cannot modify via compiler
flags.  Please use the hand-coded assembly from linux/arch/alpha/lib/.


r~