libc/sysdeps/linux/sparc/soft-fp/sfp-machine.h

   1 /* Machine-dependent software floating-point definitions.
   2    Sparc userland (_Q_*) version.
   3    Copyright (C) 1997,1998,1999, 2002, 2006 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5    Contributed by Richard Henderson (rth@cygnus.com),
   6                   Jakub Jelinek (jj@ultra.linux.cz) and
   7                   David S. Miller (davem@redhat.com).
   8
   9    The GNU C Library is free software; you can redistribute it and/or
  10    modify it under the terms of the GNU Lesser General Public
  11    License as published by the Free Software Foundation; either
  12    version 2.1 of the License, or (at your option) any later version.
  13
  14    The GNU C Library is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17    Lesser General Public License for more details.
  18
  19    You should have received a copy of the GNU Lesser General Public
  20    License along with the GNU C Library; if not, see
  21    <http://www.gnu.org/licenses/>.  */
  22
  23 #include <fpu_control.h>
  24 #include <stdlib.h>
  25
  26 #define _FP_W_TYPE_SIZE         32
  27 #define _FP_W_TYPE              unsigned long
  28 #define _FP_WS_TYPE             signed long
  29 #define _FP_I_TYPE              long
  30
  31 #define _FP_MUL_MEAT_S(R,X,Y)                           \
  32   _FP_MUL_MEAT_1_wide(_FP_WFRACBITS_S,R,X,Y,umul_ppmm)
  33 #define _FP_MUL_MEAT_D(R,X,Y)                           \
  34   _FP_MUL_MEAT_2_wide(_FP_WFRACBITS_D,R,X,Y,umul_ppmm)
  35 #define _FP_MUL_MEAT_Q(R,X,Y)                           \
  36   _FP_MUL_MEAT_4_wide(_FP_WFRACBITS_Q,R,X,Y,umul_ppmm)
  37
  38 #define _FP_DIV_MEAT_S(R,X,Y)   _FP_DIV_MEAT_1_udiv(S,R,X,Y)
  39 #define _FP_DIV_MEAT_D(R,X,Y)   _FP_DIV_MEAT_2_udiv(D,R,X,Y)
  40 #define _FP_DIV_MEAT_Q(R,X,Y)   _FP_DIV_MEAT_4_udiv(Q,R,X,Y)
  41
  42 #define _FP_NANFRAC_S           ((_FP_QNANBIT_S << 1) - 1)
  43 #define _FP_NANFRAC_D           ((_FP_QNANBIT_D << 1) - 1), -1
  44 #define _FP_NANFRAC_Q           ((_FP_QNANBIT_Q << 1) - 1), -1, -1, -1
  45 #define _FP_NANSIGN_S           0
  46 #define _FP_NANSIGN_D           0
  47 #define _FP_NANSIGN_Q           0
  48
  49 #define _FP_KEEPNANFRACP 1
  50
  51 /* If one NaN is signaling and the other is not,
  52  * we choose that one, otherwise we choose X.
  53  */
  54 /* For _Qp_* and _Q_*, this should prefer X, for
  55  * CPU instruction emulation this should prefer Y.
  56  * (see SPAMv9 B.2.2 section).
  57  */
  58 #define _FP_CHOOSENAN(fs, wc, R, X, Y, OP)                      \
  59   do {                                                          \
  60     if ((_FP_FRAC_HIGH_RAW_##fs(X) & _FP_QNANBIT_##fs)          \
  61         && !(_FP_FRAC_HIGH_RAW_##fs(Y) & _FP_QNANBIT_##fs))     \
  62       {                                                         \
  63         R##_s = Y##_s;                                          \
  64         _FP_FRAC_COPY_##wc(R,Y);                                \
  65       }                                                         \
  66     else                                                        \
  67       {                                                         \
  68         R##_s = X##_s;                                          \
  69         _FP_FRAC_COPY_##wc(R,X);                                \
  70       }                                                         \
  71     R##_c = FP_CLS_NAN;                                         \
  72   } while (0)
  73
  74 /* Some assembly to speed things up. */
  75 #define __FP_FRAC_ADD_3(r2,r1,r0,x2,x1,x0,y2,y1,y0)                     \
  76   __asm__ ("addcc %r7,%8,%2\n\
  77             addxcc %r5,%6,%1\n\
  78             addx %r3,%4,%0"                                             \
  79            : "=r" ((USItype)(r2)),                                      \
  80              "=&r" ((USItype)(r1)),                                     \
  81              "=&r" ((USItype)(r0))                                      \
  82            : "%rJ" ((USItype)(x2)),                                     \
  83              "rI" ((USItype)(y2)),                                      \
  84              "%rJ" ((USItype)(x1)),                                     \
  85              "rI" ((USItype)(y1)),                                      \
  86              "%rJ" ((USItype)(x0)),                                     \
  87              "rI" ((USItype)(y0))                                       \
  88            : "cc")
  89
  90 #define __FP_FRAC_SUB_3(r2,r1,r0,x2,x1,x0,y2,y1,y0)                     \
  91   __asm__ ("subcc %r7,%8,%2\n\
  92             subxcc %r5,%6,%1\n\
  93             subx %r3,%4,%0"                                             \
  94            : "=r" ((USItype)(r2)),                                      \
  95              "=&r" ((USItype)(r1)),                                     \
  96              "=&r" ((USItype)(r0))                                      \
  97            : "%rJ" ((USItype)(x2)),                                     \
  98              "rI" ((USItype)(y2)),                                      \
  99              "%rJ" ((USItype)(x1)),                                     \
 100              "rI" ((USItype)(y1)),                                      \
 101              "%rJ" ((USItype)(x0)),                                     \
 102              "rI" ((USItype)(y0))                                       \
 103            : "cc")
 104
 105 #define __FP_FRAC_ADD_4(r3,r2,r1,r0,x3,x2,x1,x0,y3,y2,y1,y0)            \
 106   do {                                                                  \
 107     /* We need to fool gcc,  as we need to pass more than 10            \
 108        input/outputs.  */                                               \
 109     register USItype _t1 __asm__ ("g1"), _t2 __asm__ ("g2");            \
 110     __asm__ __volatile__ ("\
 111             addcc %r8,%9,%1\n\
 112             addxcc %r6,%7,%0\n\
 113             addxcc %r4,%5,%%g2\n\
 114             addx %r2,%3,%%g1"                                           \
 115            : "=&r" ((USItype)(r1)),                                     \
 116              "=&r" ((USItype)(r0))                                      \
 117            : "%rJ" ((USItype)(x3)),                                     \
 118              "rI" ((USItype)(y3)),                                      \
 119              "%rJ" ((USItype)(x2)),                                     \
 120              "rI" ((USItype)(y2)),                                      \
 121              "%rJ" ((USItype)(x1)),                                     \
 122              "rI" ((USItype)(y1)),                                      \
 123              "%rJ" ((USItype)(x0)),                                     \
 124              "rI" ((USItype)(y0))                                       \
 125            : "cc", "g1", "g2");                                         \
 126     __asm__ __volatile__ ("" : "=r" (_t1), "=r" (_t2));                 \
 127     r3 = _t1; r2 = _t2;                                                 \
 128   } while (0)
 129
 130 #define __FP_FRAC_SUB_4(r3,r2,r1,r0,x3,x2,x1,x0,y3,y2,y1,y0)            \
 131   do {                                                                  \
 132     /* We need to fool gcc,  as we need to pass more than 10            \
 133        input/outputs.  */                                               \
 134     register USItype _t1 __asm__ ("g1"), _t2 __asm__ ("g2");            \
 135     __asm__ __volatile__ ("\
 136             subcc %r8,%9,%1\n\
 137             subxcc %r6,%7,%0\n\
 138             subxcc %r4,%5,%%g2\n\
 139             subx %r2,%3,%%g1"                                           \
 140            : "=&r" ((USItype)(r1)),                                     \
 141              "=&r" ((USItype)(r0))                                      \
 142            : "%rJ" ((USItype)(x3)),                                     \
 143              "rI" ((USItype)(y3)),                                      \
 144              "%rJ" ((USItype)(x2)),                                     \
 145              "rI" ((USItype)(y2)),                                      \
 146              "%rJ" ((USItype)(x1)),                                     \
 147              "rI" ((USItype)(y1)),                                      \
 148              "%rJ" ((USItype)(x0)),                                     \
 149              "rI" ((USItype)(y0))                                       \
 150            : "cc", "g1", "g2");                                         \
 151     __asm__ __volatile__ ("" : "=r" (_t1), "=r" (_t2));                 \
 152     r3 = _t1; r2 = _t2;                                                 \
 153   } while (0)
 154
 155 #define __FP_FRAC_DEC_3(x2,x1,x0,y2,y1,y0) __FP_FRAC_SUB_3(x2,x1,x0,x2,x1,x0,y2,y1,y0)
 156
 157 #define __FP_FRAC_DEC_4(x3,x2,x1,x0,y3,y2,y1,y0) __FP_FRAC_SUB_4(x3,x2,x1,x0,x3,x2,x1,x0,y3,y2,y1,y0)
 158
 159 #define __FP_FRAC_ADDI_4(x3,x2,x1,x0,i)                                 \
 160   __asm__ ("addcc %3,%4,%3\n\
 161             addxcc %2,%%g0,%2\n\
 162             addxcc %1,%%g0,%1\n\
 163             addx %0,%%g0,%0"                                            \
 164            : "=&r" ((USItype)(x3)),                                     \
 165              "=&r" ((USItype)(x2)),                                     \
 166              "=&r" ((USItype)(x1)),                                     \
 167              "=&r" ((USItype)(x0))                                      \
 168            : "rI" ((USItype)(i)),                                       \
 169              "0" ((USItype)(x3)),                                       \
 170              "1" ((USItype)(x2)),                                       \
 171              "2" ((USItype)(x1)),                                       \
 172              "3" ((USItype)(x0))                                        \
 173            : "cc")
 174
 175 /* Obtain the current rounding mode. */
 176 #ifndef FP_ROUNDMODE
 177 #define FP_ROUNDMODE    ((_fcw >> 30) & 0x3)
 178 #endif
 179
 180 /* Exception flags. */
 181 #define FP_EX_INVALID           (1 << 4)
 182 #define FP_EX_OVERFLOW          (1 << 3)
 183 #define FP_EX_UNDERFLOW         (1 << 2)
 184 #define FP_EX_DIVZERO           (1 << 1)
 185 #define FP_EX_INEXACT           (1 << 0)
 186
 187 #define _FP_DECL_EX     fpu_control_t _fcw
 188
 189 #ifdef __UCLIBC_HAS_FPU__
 190 #define FP_INIT_ROUNDMODE                                       \
 191 do {                                                            \
 192   _FPU_GETCW(_fcw);                                             \
 193 } while (0)
 194
 195 /* Simulate exceptions using double arithmetics. */
 196 extern double ___Q_simulate_exceptions(int exc);
 197
 198 #define FP_HANDLE_EXCEPTIONS                                    \
 199 do {                                                            \
 200   if (!_fex)                                                    \
 201     {                                                           \
 202       /* This is the common case, so we do it inline.           \
 203        * We need to clear cexc bits if any.                     \
 204        */                                                       \
 205       extern unsigned long long ___Q_numbers[];                 \
 206       __asm__ __volatile__("\
 207         ldd [%0], %%f30\n\
 208         faddd %%f30, %%f30, %%f30\
 209         " : : "r" (___Q_numbers) : "f30");                      \
 210     }                                                           \
 211   else                                                          \
 212     ___Q_simulate_exceptions (_fex);                            \
 213 } while (0)
 214 #endif