s_copysignf.s

来自「glibc2.5版源代码」· S 代码 · 共 50 行

/* copy sign, double version.
   Copyright (C) 2002 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Andreas Jaeger <[e-mail]>, 2002.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <machine/asm.h>

#ifdef __ELF__
	.section .rodata
#else
	.text
#endif

	.align ALIGNARG(4)
	ASM_TYPE_DIRECTIVE(mask,@object)
mask:
	.byte 0xff, 0xff, 0xff, 0x7f
	ASM_SIZE_DIRECTIVE(mask)

#ifdef PIC
#define MO(op) op##(%rip)
#else
#define MO(op) op
#endif

ENTRY(__copysignf)
	movss	MO(mask),%xmm3
	andps	%xmm3,%xmm0
	andnps	%xmm1,%xmm3
	orps	%xmm3,%xmm0
	retq
END (__copysignf)

weak_alias (__copysignf, copysignf)