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
  29 #define __FP_FRAC_ADD_3(r2,r1,r0,x2,x1,x0,y2,y1,y0)                     \
  30   __asm__ ("add{l} {%8,%2|%2,%8}\n\t"                                   \
  31            "adc{l} {%6,%1|%1,%6}\n\t"                                   \
  32            "adc{l} {%4,%0|%0,%4}"                                       \
  33            : "=r" ((USItype) (r2)),                                     \
  34              "=&r" ((USItype) (r1)),                                    \
  35              "=&r" ((USItype) (r0))                                     \
  36            : "%0" ((USItype) (x2)),                                     \
  37              "g" ((USItype) (y2)),                                      \
  38              "%1" ((USItype) (x1)),                                     \
  39              "g" ((USItype) (y1)),                                      \
  40              "%2" ((USItype) (x0)),                                     \
  41              "g" ((USItype) (y0)))
  42
  43 /* FIXME: The last constraint should be "g" instead of "im" if reload
  44    works properly.  */
  45 #define __FP_FRAC_SUB_4(r3,r2,r1,r0,x3,x2,x1,x0,y3,y2,y1,y0)            \
  46   __asm__ ("sub{l} {%11,%3|%3,%11}\n\t"                                 \
  47            "sbb{l} {%9,%2|%2,%9}\n\t"                                   \
  48            "sbb{l} {%7,%1|%1,%7}\n\t"                                   \
  49            "sbb{l} {%5,%0|%0,%5}"                                       \
  50            : "=r" ((USItype) (r3)),                                     \
  51              "=&r" ((USItype) (r2)),                                    \
  52              "=&r" ((USItype) (r1)),                                    \
  53              "=&r" ((USItype) (r0))                                     \
  54            : "0" ((USItype) (x3)),                                      \
  55              "g" ((USItype) (y3)),                                      \
  56              "1" ((USItype) (x2)),                                      \
  57              "g" ((USItype) (y2)),                                      \
  58              "2" ((USItype) (x1)),                                      \
  59              "g" ((USItype) (y1)),                                      \
  60              "3" ((USItype) (x0)),                                      \
  61              "im" ((USItype) (y0)))
  62
  63 #define __FP_FRAC_SUB_3(r2,r1,r0,x2,x1,x0,y2,y1,y0)                     \
  64   __asm__ ("sub{l} {%8,%2|%2,%8}\n\t"                                   \
  65            "sbb{l} {%6,%1|%1,%6}\n\t"                                   \
  66            "sbb{l} {%4,%0|%0,%4}"                                       \
  67            : "=r" ((USItype) (r2)),                                     \
  68              "=&r" ((USItype) (r1)),                                    \
  69              "=&r" ((USItype) (r0))                                     \
  70            : "0" ((USItype) (x2)),                                      \
  71              "g" ((USItype) (y2)),                                      \
  72              "1" ((USItype) (x1)),                                      \
  73              "g" ((USItype) (y1)),                                      \
  74              "2" ((USItype) (x0)),                                      \
  75              "g" ((USItype) (y0)))
  76
  77
  78 #define _FP_MUL_MEAT_S(R,X,Y)                                   \
  79   _FP_MUL_MEAT_1_wide(_FP_WFRACBITS_S,R,X,Y,umul_ppmm)
  80 #define _FP_MUL_MEAT_D(R,X,Y)                                   \
  81   _FP_MUL_MEAT_2_wide(_FP_WFRACBITS_D,R,X,Y,umul_ppmm)
  82 #define _FP_MUL_MEAT_Q(R,X,Y)                                   \
  83   _FP_MUL_MEAT_4_wide(_FP_WFRACBITS_Q,R,X,Y,umul_ppmm)
  84
  85 #define _FP_DIV_MEAT_S(R,X,Y)   _FP_DIV_MEAT_1_udiv(S,R,X,Y)
  86 #define _FP_DIV_MEAT_D(R,X,Y)   _FP_DIV_MEAT_2_udiv(D,R,X,Y)
  87 #define _FP_DIV_MEAT_Q(R,X,Y)   _FP_DIV_MEAT_4_udiv(Q,R,X,Y)
  88
  89 #define _FP_NANFRAC_S           _FP_QNANBIT_S
  90 #define _FP_NANFRAC_D           _FP_QNANBIT_D, 0
  91 /* Even if XFmode is 12byte,  we have to pad it to 16byte since soft-fp
  92    emulation is done in 16byte.  */
  93 #define _FP_NANFRAC_E           _FP_QNANBIT_E, 0, 0, 0
  94 #define _FP_NANFRAC_Q           _FP_QNANBIT_Q, 0, 0, 0
  95 #define _FP_NANSIGN_S           1
  96 #define _FP_NANSIGN_D           1
  97 #define _FP_NANSIGN_E           1
  98 #define _FP_NANSIGN_Q           1
  99
 100 #define _FP_KEEPNANFRACP 1
 101
 102 /* Here is something Intel misdesigned: the specs don't define
 103    the case where we have two NaNs with same mantissas, but
 104    different sign. Different operations pick up different NaNs.  */
 105 #define _FP_CHOOSENAN(fs, wc, R, X, Y, OP)                      \
 106   do {                                                          \
 107     if (_FP_FRAC_GT_##wc(X, Y)                                  \
 108         || (_FP_FRAC_EQ_##wc(X,Y) && (OP == '+' || OP == '*'))) \
 109       {                                                         \
 110         R##_s = X##_s;                                          \
 111         _FP_FRAC_COPY_##wc(R,X);                                \
 112       }                                                         \
 113     else                                                        \
 114       {                                                         \
 115         R##_s = Y##_s;                                          \
 116         _FP_FRAC_COPY_##wc(R,Y);                                \
 117       }                                                         \
 118     R##_c = FP_CLS_NAN;                                         \
 119   } while (0)
 120
 121 #define FP_EX_INVALID           0x01
 122 #define FP_EX_DENORM            0x02
 123 #define FP_EX_DIVZERO           0x04
 124 #define FP_EX_OVERFLOW          0x08
 125 #define FP_EX_UNDERFLOW         0x10
 126 #define FP_EX_INEXACT           0x20
 127
 128 struct fenv
 129 {
 130   unsigned short int __control_word;
 131   unsigned short int __unused1;
 132   unsigned short int __status_word;
 133   unsigned short int __unused2;
 134   unsigned short int __tags;
 135   unsigned short int __unused3;
 136   unsigned int __eip;
 137   unsigned short int __cs_selector;
 138   unsigned int __opcode:11;
 139   unsigned int __unused4:5;
 140   unsigned int __data_offset;
 141   unsigned short int __data_selector;
 142   unsigned short int __unused5;
 143 };
 144
 145 #define FP_HANDLE_EXCEPTIONS                                            \
 146   do {                                                                  \
 147     if (_fex & FP_EX_INVALID)                                           \
 148       {                                                                 \
 149         float f = 0.0;                                                  \
 150         __asm__ __volatile__ ("fdiv %0" : "+t" (f));                    \
 151         __asm__ __volatile__ ("fwait");                                 \
 152       }                                                                 \
 153     if (_fex & FP_EX_DIVZERO)                                           \
 154       {                                                                 \
 155         float f = 1.0, g = 0.0;                                         \
 156         __asm__ __volatile__ ("fdivp" : "=t" (f)                        \
 157                                       : "0" (f), "u" (g)                \
 158                                       : "st(1)");                       \
 159         __asm__ __volatile__ ("fwait");                                 \
 160       }                                                                 \
 161     if (_fex & FP_EX_OVERFLOW)                                          \
 162       {                                                                 \
 163         struct fenv temp;                                               \
 164         __asm__ __volatile__ ("fnstenv %0" : "=m" (temp));              \
 165         temp.__status_word |= FP_EX_OVERFLOW;                           \
 166         __asm__ __volatile__ ("fldenv %0" : : "m" (temp));              \
 167         __asm__ __volatile__ ("fwait");                                 \
 168       }                                                                 \
 169     if (_fex & FP_EX_UNDERFLOW)                                         \
 170       {                                                                 \
 171         struct fenv temp;                                               \
 172         __asm__ __volatile__ ("fnstenv %0" : "=m" (temp));              \
 173         temp.__status_word |= FP_EX_UNDERFLOW;                          \
 174         __asm__ __volatile__ ("fldenv %0" : : "m" (temp));              \
 175         __asm__ __volatile__ ("fwait");                                 \
 176       }                                                                 \
 177     if (_fex & FP_EX_INEXACT)                                           \
 178       {                                                                 \
 179         struct fenv temp;                                               \
 180         __asm__ __volatile__ ("fnstenv %0" : "=m" (temp));              \
 181         temp.__status_word |= FP_EX_INEXACT;                            \
 182         __asm__ __volatile__ ("fldenv %0" : : "m" (temp));              \
 183         __asm__ __volatile__ ("fwait");                                 \
 184       }                                                                 \
 185   } while (0)
 186
 187 #define FP_RND_NEAREST          0
 188 #define FP_RND_ZERO             0xc00
 189 #define FP_RND_PINF             0x800
 190 #define FP_RND_MINF             0x400
 191
 192 #define _FP_DECL_EX \
 193   unsigned short _fcw __attribute__ ((unused)) = FP_RND_NEAREST
 194
 195 #define FP_INIT_ROUNDMODE                       \
 196   do {                                          \
 197     __asm__ ("fnstcw %0" : "=m" (_fcw));        \
 198   } while (0)
 199
 200 #define FP_ROUNDMODE            (_fcw & 0xc00)
 201
 202 #define __LITTLE_ENDIAN 1234
 203 #define __BIG_ENDIAN    4321
 204
 205 #define __BYTE_ORDER __LITTLE_ENDIAN
 206
 207 /* Define ALIASNAME as a strong alias for NAME.  */
 208 #if defined __MACH__
 209 /* Mach-O doesn't support aliasing.  If these functions ever return
 210    anything but CMPtype we need to revisit this... */
 211 #define strong_alias(name, aliasname) \
 212   CMPtype aliasname (TFtype a, TFtype b) { return name(a, b); }
 213 #else
 214 # define strong_alias(name, aliasname) _strong_alias(name, aliasname)
 215 # define _strong_alias(name, aliasname) \
 216   extern __typeof (name) aliasname __attribute__ ((alias (#name)));
 217 #endif