contrib/gcc-4.7/libgcc/config/i386/32/sfp-machine.h

   1 #define _FP_W_TYPE_SIZE         32
   2 #define _FP_W_TYPE              unsigned int
   3 #define _FP_WS_TYPE             signed int
   4 #define _FP_I_TYPE              int
   5
   6 /* The type of the result of a floating point comparison.  This must
   7    match `__libgcc_cmp_return__' in GCC for the target.  */
   8 typedef int __gcc_CMPtype __attribute__ ((mode (__libgcc_cmp_return__)));
   9 #define CMPtype __gcc_CMPtype
  10
  11 #define __FP_FRAC_ADD_4(r3,r2,r1,r0,x3,x2,x1,x0,y3,y2,y1,y0)    \
  12   __asm__ ("add{l} {%11,%3|%3,%11}\n\t"                         \
  13            "adc{l} {%9,%2|%2,%9}\n\t"                           \
  14            "adc{l} {%7,%1|%1,%7}\n\t"                           \
  15            "adc{l} {%5,%0|%0,%5}"                               \
  16            : "=r" ((USItype) (r3)),                             \
  17              "=&r" ((USItype) (r2)),                            \
  18              "=&r" ((USItype) (r1)),                            \
  19              "=&r" ((USItype) (r0))                             \
  20            : "%0" ((USItype) (x3)),                             \
  21              "g" ((USItype) (y3)),                              \
  22              "%1" ((USItype) (x2)),                             \
  23              "g" ((USItype) (y2)),                              \
  24              "%2" ((USItype) (x1)),                             \
  25              "g" ((USItype) (y1)),                              \
  26              "%3" ((USItype) (x0)),                             \
  27              "g" ((USItype) (y0)))
  28 #define __FP_FRAC_ADD_3(r2,r1,r0,x2,x1,x0,y2,y1,y0)             \
  29   __asm__ ("add{l} {%8,%2|%2,%8}\n\t"                           \
  30            "adc{l} {%6,%1|%1,%6}\n\t"                           \
  31            "adc{l} {%4,%0|%0,%4}"                               \
  32            : "=r" ((USItype) (r2)),                             \
  33              "=&r" ((USItype) (r1)),                            \
  34              "=&r" ((USItype) (r0))                             \
  35            : "%0" ((USItype) (x2)),                             \
  36              "g" ((USItype) (y2)),                              \
  37              "%1" ((USItype) (x1)),                             \
  38              "g" ((USItype) (y1)),                              \
  39              "%2" ((USItype) (x0)),                             \
  40              "g" ((USItype) (y0)))
  41 #define __FP_FRAC_SUB_4(r3,r2,r1,r0,x3,x2,x1,x0,y3,y2,y1,y0)    \
  42   __asm__ ("sub{l} {%11,%3|%3,%11}\n\t"                         \
  43            "sbb{l} {%9,%2|%2,%9}\n\t"                           \
  44            "sbb{l} {%7,%1|%1,%7}\n\t"                           \
  45            "sbb{l} {%5,%0|%0,%5}"                               \
  46            : "=r" ((USItype) (r3)),                             \
  47              "=&r" ((USItype) (r2)),                            \
  48              "=&r" ((USItype) (r1)),                            \
  49              "=&r" ((USItype) (r0))                             \
  50            : "0" ((USItype) (x3)),                              \
  51              "g" ((USItype) (y3)),                              \
  52              "1" ((USItype) (x2)),                              \
  53              "g" ((USItype) (y2)),                              \
  54              "2" ((USItype) (x1)),                              \
  55              "g" ((USItype) (y1)),                              \
  56              "3" ((USItype) (x0)),                              \
  57              "g" ((USItype) (y0)))
  58 #define __FP_FRAC_SUB_3(r2,r1,r0,x2,x1,x0,y2,y1,y0)             \
  59   __asm__ ("sub{l} {%8,%2|%2,%8}\n\t"                           \
  60            "sbb{l} {%6,%1|%1,%6}\n\t"                           \
  61            "sbb{l} {%4,%0|%0,%4}"                               \
  62            : "=r" ((USItype) (r2)),                             \
  63              "=&r" ((USItype) (r1)),                            \
  64              "=&r" ((USItype) (r0))                             \
  65            : "0" ((USItype) (x2)),                              \
  66              "g" ((USItype) (y2)),                              \
  67              "1" ((USItype) (x1)),                              \
  68              "g" ((USItype) (y1)),                              \
  69              "2" ((USItype) (x0)),                              \
  70              "g" ((USItype) (y0)))
  71
  72
  73 #define _FP_MUL_MEAT_Q(R,X,Y)                                   \
  74   _FP_MUL_MEAT_4_wide(_FP_WFRACBITS_Q,R,X,Y,umul_ppmm)
  75
  76 #define _FP_DIV_MEAT_Q(R,X,Y)   _FP_DIV_MEAT_4_udiv(Q,R,X,Y)
  77
  78 #define _FP_NANFRAC_S           _FP_QNANBIT_S
  79 #define _FP_NANFRAC_D           _FP_QNANBIT_D, 0
  80 /* Even if XFmode is 12byte,  we have to pad it to
  81    16byte since soft-fp emulation is done in 16byte.  */
  82 #define _FP_NANFRAC_E           _FP_QNANBIT_E, 0, 0, 0
  83 #define _FP_NANFRAC_Q           _FP_QNANBIT_Q, 0, 0, 0
  84 #define _FP_NANSIGN_S           1
  85 #define _FP_NANSIGN_D           1
  86 #define _FP_NANSIGN_E           1
  87 #define _FP_NANSIGN_Q           1
  88
  89 #define _FP_KEEPNANFRACP 1
  90
  91 /* Here is something Intel misdesigned: the specs don't define
  92    the case where we have two NaNs with same mantissas, but
  93    different sign. Different operations pick up different NaNs.  */
  94 #define _FP_CHOOSENAN(fs, wc, R, X, Y, OP)                      \
  95   do {                                                          \
  96     if (_FP_FRAC_GT_##wc(X, Y)                                  \
  97         || (_FP_FRAC_EQ_##wc(X,Y) && (OP == '+' || OP == '*'))) \
  98       {                                                         \
  99         R##_s = X##_s;                                          \
 100         _FP_FRAC_COPY_##wc(R,X);                                \
 101       }                                                         \
 102     else                                                        \
 103       {                                                         \
 104         R##_s = Y##_s;                                          \
 105         _FP_FRAC_COPY_##wc(R,Y);                                \
 106       }                                                         \
 107     R##_c = FP_CLS_NAN;                                         \
 108   } while (0)
 109
 110 #ifndef _SOFT_FLOAT
 111 #define FP_EX_INVALID           0x01
 112 #define FP_EX_DENORM            0x02
 113 #define FP_EX_DIVZERO           0x04
 114 #define FP_EX_OVERFLOW          0x08
 115 #define FP_EX_UNDERFLOW         0x10
 116 #define FP_EX_INEXACT           0x20
 117
 118 struct fenv
 119 {
 120   unsigned short int __control_word;
 121   unsigned short int __unused1;
 122   unsigned short int __status_word;
 123   unsigned short int __unused2;
 124   unsigned short int __tags;
 125   unsigned short int __unused3;
 126   unsigned int __eip;
 127   unsigned short int __cs_selector;
 128   unsigned int __opcode:11;
 129   unsigned int __unused4:5;
 130   unsigned int __data_offset;
 131   unsigned short int __data_selector;
 132   unsigned short int __unused5;
 133 };
 134
 135 #define FP_HANDLE_EXCEPTIONS                                            \
 136   do {                                                                  \
 137     if (_fex & FP_EX_INVALID)                                           \
 138       {                                                                 \
 139         float f = 0.0;                                                  \
 140         __asm__ __volatile__ ("fdiv {%y0, %0|%0, %y0}" : "+t" (f));     \
 141         __asm__ __volatile__ ("fwait");                                 \
 142       }                                                                 \
 143     if (_fex & FP_EX_DIVZERO)                                           \
 144       {                                                                 \
 145         float f = 1.0, g = 0.0;                                         \
 146         __asm__ __volatile__ ("fdivp {%0, %y1|%y1, %0}"                 \
 147                                       : "+t" (f) : "u" (g)              \
 148                                       : "st(1)");                       \
 149         __asm__ __volatile__ ("fwait");                                 \
 150       }                                                                 \
 151     if (_fex & FP_EX_OVERFLOW)                                          \
 152       {                                                                 \
 153         struct fenv temp;                                               \
 154         __asm__ __volatile__ ("fnstenv %0" : "=m" (temp));              \
 155         temp.__status_word |= FP_EX_OVERFLOW;                           \
 156         __asm__ __volatile__ ("fldenv %0" : : "m" (temp));              \
 157         __asm__ __volatile__ ("fwait");                                 \
 158       }                                                                 \
 159     if (_fex & FP_EX_UNDERFLOW)                                         \
 160       {                                                                 \
 161         struct fenv temp;                                               \
 162         __asm__ __volatile__ ("fnstenv %0" : "=m" (temp));              \
 163         temp.__status_word |= FP_EX_UNDERFLOW;                          \
 164         __asm__ __volatile__ ("fldenv %0" : : "m" (temp));              \
 165         __asm__ __volatile__ ("fwait");                                 \
 166       }                                                                 \
 167     if (_fex & FP_EX_INEXACT)                                           \
 168       {                                                                 \
 169         struct fenv temp;                                               \
 170         __asm__ __volatile__ ("fnstenv %0" : "=m" (temp));              \
 171         temp.__status_word |= FP_EX_INEXACT;                            \
 172         __asm__ __volatile__ ("fldenv %0" : : "m" (temp));              \
 173         __asm__ __volatile__ ("fwait");                                 \
 174       }                                                                 \
 175   } while (0)
 176
 177 #define FP_RND_NEAREST          0
 178 #define FP_RND_ZERO             0xc00
 179 #define FP_RND_PINF             0x800
 180 #define FP_RND_MINF             0x400
 181
 182 #define _FP_DECL_EX \
 183   unsigned short _fcw __attribute__ ((unused)) = FP_RND_NEAREST
 184
 185 #define FP_INIT_ROUNDMODE                       \
 186   do {                                          \
 187     __asm__ ("fnstcw %0" : "=m" (_fcw));        \
 188   } while (0)
 189
 190 #define FP_ROUNDMODE            (_fcw & 0xc00)
 191 #endif
 192
 193 #define __LITTLE_ENDIAN 1234
 194 #define __BIG_ENDIAN    4321
 195
 196 #define __BYTE_ORDER __LITTLE_ENDIAN
 197
 198 /* Define ALIASNAME as a strong alias for NAME.  */
 199 #if defined __MACH__
 200 /* Mach-O doesn't support aliasing.  If these functions ever return
 201    anything but CMPtype we need to revisit this... */
 202 #define strong_alias(name, aliasname) \
 203   CMPtype aliasname (TFtype a, TFtype b) { return name(a, b); }
 204 #else
 205 # define strong_alias(name, aliasname) _strong_alias(name, aliasname)
 206 # define _strong_alias(name, aliasname) \
 207   extern __typeof (name) aliasname __attribute__ ((alias (#name)));
 208 #endif