mirror of git://sourceware.org/git/glibc.git
51 lines
1.6 KiB
ArmAsm
51 lines
1.6 KiB
ArmAsm
/* Copy a sign bit between floating-point values.
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Copyright (C) 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* This has been coded in assembler because GCC makes such a mess of it
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when it's coded in C. */
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#include <sysdep.h>
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ENTRY(__copysign)
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/* double [f1] copysign (double [f1] x, double [f2] y);
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copysign(x,y) returns a value with the magnitude of x and
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with the sign bit of y. */
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stwu %r1,-16(%r1)
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stfd %f2,8(%r1)
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lwz %r3,8(%r1)
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cmpwi %r3,0
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addi %r1,%r1,16
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blt 0f
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fabs %f1,%f1
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blr
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0: fnabs %f1,%f1
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blr
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END (__copysign)
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weak_alias(__copysign,copysign)
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/* It turns out that it's safe to use this code even for single-precision. */
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weak_alias(__copysign,copysignf)
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strong_alias(__copysign,__copysignf)
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#ifdef NO_LONG_DOUBLE
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weak_alias(__copysign,copysignl)
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strong_alias(__copysign,__copysignl)
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#endif
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