gcc/config/i386/sfp-machine.h

   1 #define _FP_W_TYPE_SIZE         64
   2 #define _FP_W_TYPE              unsigned long
   3 #define _FP_WS_TYPE             signed long
   4 #define _FP_I_TYPE              long
   5
   6 typedef int TItype __attribute__((mode(TI)));
   7 typedef unsigned int UTItype __attribute__((mode(TI)));
   8
   9 #define TI_BITS                 (__CHAR_BIT__ * (int)sizeof(TItype))
  10
  11 #define _FP_MUL_MEAT_Q(R,X,Y)                           \
  12   _FP_MUL_MEAT_2_wide(_FP_WFRACBITS_Q,R,X,Y,umul_ppmm)
  13
  14 #define _FP_DIV_MEAT_Q(R,X,Y)   _FP_DIV_MEAT_2_udiv(Q,R,X,Y)
  15
  16 #define _FP_NANFRAC_S           _FP_QNANBIT_S
  17 #define _FP_NANFRAC_D           _FP_QNANBIT_D
  18 #define _FP_NANFRAC_E           _FP_QNANBIT_E, 0
  19 #define _FP_NANFRAC_Q           _FP_QNANBIT_Q, 0
  20 #define _FP_NANSIGN_S           1
  21 #define _FP_NANSIGN_D           1
  22 #define _FP_NANSIGN_E           1
  23 #define _FP_NANSIGN_Q           1
  24
  25 #define _FP_KEEPNANFRACP 1
  26
  27 /* Here is something Intel misdesigned: the specs don't define
  28    the case where we have two NaNs with same mantissas, but
  29    different sign. Different operations pick up different NaNs.
  30  */
  31 #define _FP_CHOOSENAN(fs, wc, R, X, Y, OP)                      \
  32   do {                                                          \
  33     if (_FP_FRAC_GT_##wc(X, Y)                                  \
  34         || (_FP_FRAC_EQ_##wc(X,Y) && (OP == '+' || OP == '*'))) \
  35       {                                                         \
  36         R##_s = X##_s;                                          \
  37         _FP_FRAC_COPY_##wc(R,X);                                \
  38       }                                                         \
  39     else                                                        \
  40       {                                                         \
  41         R##_s = Y##_s;                                          \
  42         _FP_FRAC_COPY_##wc(R,Y);                                \
  43       }                                                         \
  44     R##_c = FP_CLS_NAN;                                         \
  45   } while (0)
  46
  47 #define FP_EX_INVALID           0x01
  48 #define FP_EX_DENORM            0x02
  49 #define FP_EX_DIVZERO           0x04
  50 #define FP_EX_OVERFLOW          0x08
  51 #define FP_EX_UNDERFLOW         0x10
  52 #define FP_EX_INEXACT           0x20
  53
  54 struct fenv
  55 {
  56   unsigned short int __control_word;
  57   unsigned short int __unused1;
  58   unsigned short int __status_word;
  59   unsigned short int __unused2;
  60   unsigned short int __tags;
  61   unsigned short int __unused3;
  62   unsigned int __eip;
  63   unsigned short int __cs_selector;
  64   unsigned int __opcode:11;
  65   unsigned int __unused4:5;
  66   unsigned int __data_offset;
  67   unsigned short int __data_selector;
  68   unsigned short int __unused5;
  69 };
  70
  71 #define FP_HANDLE_EXCEPTIONS                                            \
  72   do {                                                                  \
  73     if (_fex & FP_EX_INVALID)                                           \
  74       {                                                                 \
  75         float f = 0.0;                                                  \
  76         __asm__ __volatile__ ("divss %0, %0 " : : "x" (f));             \
  77       }                                                                 \
  78     if (_fex & FP_EX_DIVZERO)                                           \
  79       {                                                                 \
  80         float f = 1.0, g = 0.0;                                         \
  81         __asm__ __volatile__ ("divss %1, %0" : : "x" (f), "x" (g));     \
  82       }                                                                 \
  83     if (_fex & FP_EX_OVERFLOW)                                          \
  84       {                                                                 \
  85         struct fenv temp;                                               \
  86         __asm__ __volatile__ ("fnstenv %0" : "=m" (temp));              \
  87         temp.__status_word |= FP_EX_OVERFLOW;                           \
  88         __asm__ __volatile__ ("fldenv %0" : : "m" (temp));              \
  89         __asm__ __volatile__ ("fwait");                                 \
  90       }                                                                 \
  91     if (_fex & FP_EX_UNDERFLOW)                                         \
  92       {                                                                 \
  93         struct fenv temp;                                               \
  94         __asm__ __volatile__ ("fnstenv %0" : "=m" (temp));              \
  95         temp.__status_word |= FP_EX_UNDERFLOW;                          \
  96         __asm__ __volatile__ ("fldenv %0" : : "m" (temp));              \
  97         __asm__ __volatile__ ("fwait");                                 \
  98       }                                                                 \
  99     if (_fex & FP_EX_INEXACT)                                           \
 100       {                                                                 \
 101         struct fenv temp;                                               \
 102         __asm__ __volatile__ ("fnstenv %0" : "=m" (temp));              \
 103         temp.__status_word |= FP_EX_INEXACT;                            \
 104         __asm__ __volatile__ ("fldenv %0" : : "m" (temp));              \
 105         __asm__ __volatile__ ("fwait");                                 \
 106       }                                                                 \
 107   } while (0)
 108
 109 #define FP_RND_NEAREST          0
 110 #define FP_RND_ZERO             0xc00
 111 #define FP_RND_PINF             0x800
 112 #define FP_RND_MINF             0x400
 113
 114 #define _FP_DECL_EX \
 115   unsigned short _fcw __attribute__ ((unused)) = FP_RND_NEAREST
 116
 117 #define FP_INIT_ROUNDMODE                       \
 118   do {                                          \
 119     __asm__ ("fnstcw %0" : "=m" (_fcw));        \
 120   } while (0)
 121
 122 #define FP_ROUNDMODE            (_fcw & 0xc00)
 123
 124 #define __LITTLE_ENDIAN 1234
 125 #define __BIG_ENDIAN    4321
 126
 127 #define __BYTE_ORDER __LITTLE_ENDIAN
 128
 129 /* Define ALIASNAME as a strong alias for NAME.  */
 130 #if defined __MACH__
 131 /* Mach-O doesn't support aliasing.  If these functions ever return
 132    anything but int we need to revisit this... */
 133 #define strong_alias(name, aliasname) \
 134   int aliasname (TFtype a, TFtype b) { return name(a, b); }
 135 #else
 136 # define strong_alias(name, aliasname) _strong_alias(name, aliasname)
 137 # define _strong_alias(name, aliasname) \
 138   extern __typeof (name) aliasname __attribute__ ((alias (#name)));
 139 #endif