sysdeps/alpha/fpu/cfloat-compat.h

   1 /* Compatibility macros for old and new Alpha complex float ABI.
   2    Copyright (C) 2004 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 /* The behaviour of complex float changed between GCC 3.3 and 3.4.
  21
  22    In 3.3 and before (below, complex version 1, or "c1"), complex float
  23    values were packed into one floating point register.
  24
  25    In 3.4 and later (below, complex version 2, or "c2"), GCC changed to
  26    follow the official Tru64 ABI, which passes the components of a complex
  27    as separate parameters.  */
  28
  29 #if __GNUC_PREREQ(3,4)
  30   typedef union { double d; _Complex float cf; } c1_compat;
  31 # define c1_cfloat_decl(x)      double x
  32 # define c1_cfloat_real(x)      __real__ c1_cfloat_value (x)
  33 # define c1_cfloat_imag(x)      __imag__ c1_cfloat_value (x)
  34 # define c1_cfloat_value(x)     (((c1_compat *)(void *)&x)->cf)
  35 # define c1_cfloat_rettype      double
  36 # define c1_cfloat_return(x)    ({ c1_compat _; _.cf = (x); _.d; })
  37 # define c2_cfloat_decl(x)      _Complex float x
  38 # define c2_cfloat_real(x)      __real__ x
  39 # define c2_cfloat_imag(x)      __imag__ x
  40 # define c2_cfloat_value(x)     x
  41 # define c2_cfloat_rettype      _Complex float
  42 # define c2_cfloat_return(x)    x
  43 #else
  44 # define c1_cfloat_decl(x)      _Complex float x
  45 # define c1_cfloat_real(x)      __real__ x
  46 # define c1_cfloat_imag(x)      __imag__ x
  47 # define c1_cfloat_value(x)     x
  48 # define c1_cfloat_rettype      _Complex float
  49 # define c1_cfloat_return(x)    x
  50 # define c2_cfloat_decl(x)      float x ## r, float x ## i
  51 # define c2_cfloat_real(x)      x ## r
  52 # define c2_cfloat_imag(x)      x ## i
  53 # define c2_cfloat_value(x) \
  54     ({ _Complex float _; __real__ _ = x##r; __imag__ _ = x##i; _; })
  55 # define c2_cfloat_rettype      double _Complex
  56 # define c2_cfloat_return(x)    x
  57 #endif
  58
  59 /* Get the proper symbol versions defined for each function.  */
  60
  61 #include <shlib-compat.h>
  62
  63 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_3_4)
  64 #define cfloat_versions_compat(func) \
  65   compat_symbol (libm, __c1_##func, func, GLIBC_2_1)
  66 #else
  67 #define cfloat_versions_compat(func)
  68 #endif
  69
  70 #define cfloat_versions(func) \
  71   cfloat_versions_compat(func); \
  72   versioned_symbol (libm, __c2_##func, func, GLIBC_2_3_4); \
  73   extern typeof(__c2_##func) __##func attribute_hidden; \
  74   strong_alias (__c2_##func, __##func)