Re: status of armhf asm with VFP instructions

[Rich Felker <dalias@libc.org>]

On Fri, Oct 16, 2015 at 01:58:09AM +0200, Szabolcs Nagy wrote:
> * Szabolcs Nagy <nsz@port70.net> [2015-10-16 01:16:07 +0200]:
> > * Rich Felker <dalias@libc.org> [2015-10-15 18:44:25 -0400]:
> > > It seems we're already using the new forms vsqrt and vabs in
> > > src/math/armhf/*.s. So using vmrs/vmsr presumably will not break
> > > support for any toolchains that work now.
> > > 
> > 
> > vmrs/vmsr can break on old binutils versions (2.18 - 2.20) and
> > 2.20 is not that ancient.. is that ok?
> > 
> 
> attached the old armhf patch with updated commit message.

> >From 542d4003a60320ac0446b156681c59cbc19dd6a1 Mon Sep 17 00:00:00 2001
> From: Szabolcs Nagy <nsz@port70.net>
> Date: Tue, 21 Jul 2015 20:00:03 +0000
> Subject: [PATCH] fix armhf asm to use .fpu vfp and UAL mnemonics
> 
> (1) Some armhf gcc toolchains (built with --with-float=hard but without
> --with-fpu=vfp*) do not pass -mfpu=vfp to the assembler and then binutils
> rejects the UAL mnemonics for VFP unless there is an .fpu vfp directive
> in the asm source.

I've committed just this part 1 since it's independent of the other
changes and should yield nothing but an improvement in compatibility.
I'd still like to go ahead with all the UAL changes after release.

Rich