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Date: Mon, 02 Dec 2019 21:00:00 -0000
From: Joseph Myers <joseph@codesourcery.com>
To: Stefan Liebler <stli@linux.ibm.com>
CC: <libc-alpha@sourceware.org>
Subject: Re: [PATCH 13/13] Use GCC builtins for copysign functions if
 desired.
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On Mon, 2 Dec 2019, Stefan Liebler wrote:

> This patch is using the corresponding GCC builtin for copysignf, copysign,
> copysignl and copysignf128 if the USE_FUNCTION_BUILTIN macros are defined to one
> in math-use-builtins.h.

I believe this is always safe for these implementations (the only case 
where GCC might not expand copysign functions inline is copysignl for IBM 
long double, in the soft-float case).

-- 
Joseph S. Myers
joseph@codesourcery.com