libgcc/config/i386/64/sfp-machine.h

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