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