blob: d5b96cf772bb7f5f411aed9c1847448e6f33b31d [file] [log] [blame]
#
# (C) 2008-2009 Advanced Micro Devices, Inc. All Rights Reserved.
#
# This file is part of libacml_mv.
#
# libacml_mv 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.
#
# libacml_mv 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 libacml_mv. If not, see
# <http://www.gnu.org/licenses/>.
#
#
#copysign.S
#
# An implementation of the copysign libm function.
#
# The copysign functions produce a value with the magnitude of x and the sign of y.
# They produce a NaN (with the sign of y) if x is a NaN. On implementations that
# represent a signed zero but do not treat negative zero consistently in arithmetic
# operations, the copysign functions regard the sign of zero as positive.
#
#
# Prototype:
#
# double copysign(float x, float y)
#
#
#
# Algorithm:
#
#include "fn_macros.h"
#define fname FN_PROTOTYPE(copysign)
#ifdef __ELF__
.section .note.GNU-stack,"",@progbits
#endif
.text
.align 16
.p2align 4,,15
.globl fname
.type fname,@function
fname:
PSLLQ $1,%xmm0
PSRLQ $1,%xmm0
PSRLQ $63,%xmm1
PSLLQ $63,%xmm1
POR %xmm1,%xmm0
ret