sysdeps/powerpc/fpu/math_ldbl.h

   1 /* Manipulation of the bit representation of 'long double' quantities.
   2    Copyright (C) 2006-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _MATH_LDBL_H_PPC_
  20 #define _MATH_LDBL_H_PPC_ 1
  21
  22 /* GCC does not optimize the default ldbl_pack code to not spill register
  23    in the stack. The following optimization tells gcc that pack/unpack
  24    is really a nop.  We use fr1/fr2 because those are the regs used to
  25    pass/return a single long double arg.  */
  26 static inline long double
  27 ldbl_pack_ppc (double a, double aa)
  28 {
  29   register long double x __asm__ ("fr1");
  30   register double xh __asm__ ("fr1");
  31   register double xl __asm__ ("fr2");
  32   xh = a;
  33   xl = aa;
  34   __asm__ ("" : "=f" (x) : "f" (xh), "f" (xl));
  35   return x;
  36 }
  37
  38 static inline void
  39 ldbl_unpack_ppc (long double l, double *a, double *aa)
  40 {
  41   register long double x __asm__ ("fr1");
  42   register double xh __asm__ ("fr1");
  43   register double xl __asm__ ("fr2");
  44   x = l;
  45   __asm__ ("" : "=f" (xh), "=f" (xl) : "f" (x));
  46   *a = xh;
  47   *aa = xl;
  48 }
  49
  50 #define ldbl_pack   ldbl_pack_ppc
  51 #define ldbl_unpack ldbl_unpack_ppc
  52
  53 #include <sysdeps/ieee754/ldbl-128ibm/math_ldbl.h>
  54
  55 #endif /* math_ldbl.h */