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56 lines
1.8 KiB
C
56 lines
1.8 KiB
C
/* Manipulation of the bit representation of 'long double' quantities.
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Copyright (C) 2006-2018 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _MATH_LDBL_H_PPC_
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#define _MATH_LDBL_H_PPC_ 1
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/* GCC does not optimize the default ldbl_pack code to not spill register
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in the stack. The following optimization tells gcc that pack/unpack
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is really a nop. We use fr1/fr2 because those are the regs used to
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pass/return a single long double arg. */
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static inline long double
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ldbl_pack_ppc (double a, double aa)
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{
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register long double x __asm__ ("fr1");
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register double xh __asm__ ("fr1");
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register double xl __asm__ ("fr2");
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xh = a;
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xl = aa;
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__asm__ ("" : "=f" (x) : "f" (xh), "f" (xl));
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return x;
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}
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static inline void
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ldbl_unpack_ppc (long double l, double *a, double *aa)
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{
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register long double x __asm__ ("fr1");
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register double xh __asm__ ("fr1");
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register double xl __asm__ ("fr2");
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x = l;
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__asm__ ("" : "=f" (xh), "=f" (xl) : "f" (x));
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*a = xh;
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*aa = xl;
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}
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#define ldbl_pack ldbl_pack_ppc
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#define ldbl_unpack ldbl_unpack_ppc
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#include <sysdeps/ieee754/ldbl-128ibm/math_ldbl.h>
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#endif /* math_ldbl.h */
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