target-openrisc/fpu_helper.c

   1 /*
   2  * OpenRISC float helper routines
   3  *
   4  * Copyright (c) 2011-2012 Jia Liu <proljc@gmail.com>
   5  *                         Feng Gao <gf91597@gmail.com>
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "cpu.h"
  22 #include "helper.h"
  23 #include "exception.h"
  24
  25 static inline uint32_t ieee_ex_to_openrisc(OpenRISCCPU *cpu, int fexcp)
  26 {
  27     int ret = 0;
  28     if (fexcp) {
  29         if (fexcp & float_flag_invalid) {
  30             cpu->env.fpcsr |= FPCSR_IVF;
  31             ret = 1;
  32         }
  33         if (fexcp & float_flag_overflow) {
  34             cpu->env.fpcsr |= FPCSR_OVF;
  35             ret = 1;
  36         }
  37         if (fexcp & float_flag_underflow) {
  38             cpu->env.fpcsr |= FPCSR_UNF;
  39             ret = 1;
  40         }
  41         if (fexcp & float_flag_divbyzero) {
  42             cpu->env.fpcsr |= FPCSR_DZF;
  43             ret = 1;
  44         }
  45         if (fexcp & float_flag_inexact) {
  46             cpu->env.fpcsr |= FPCSR_IXF;
  47             ret = 1;
  48         }
  49     }
  50
  51     return ret;
  52 }
  53
  54 static inline void update_fpcsr(OpenRISCCPU *cpu)
  55 {
  56     int tmp = ieee_ex_to_openrisc(cpu,
  57                               get_float_exception_flags(&cpu->env.fp_status));
  58
  59     SET_FP_CAUSE(cpu->env.fpcsr, tmp);
  60     if ((GET_FP_ENABLE(cpu->env.fpcsr) & tmp) &&
  61         (cpu->env.fpcsr & FPCSR_FPEE)) {
  62         helper_exception(&cpu->env, EXCP_FPE);
  63     } else {
  64         UPDATE_FP_FLAGS(cpu->env.fpcsr, tmp);
  65     }
  66 }
  67
  68 uint64_t HELPER(itofd)(CPUOpenRISCState *env, uint64_t val)
  69 {
  70     uint64_t itofd;
  71     OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));
  72
  73     set_float_exception_flags(0, &cpu->env.fp_status);
  74     itofd = int32_to_float64(val, &cpu->env.fp_status);
  75     update_fpcsr(cpu);
  76
  77     return itofd;
  78 }
  79
  80 uint32_t HELPER(itofs)(CPUOpenRISCState *env, uint32_t val)
  81 {
  82     uint32_t itofs;
  83     OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));
  84
  85     set_float_exception_flags(0, &cpu->env.fp_status);
  86     itofs = int32_to_float32(val, &cpu->env.fp_status);
  87     update_fpcsr(cpu);
  88
  89     return itofs;
  90 }
  91
  92 uint64_t HELPER(ftoid)(CPUOpenRISCState *env, uint64_t val)
  93 {
  94     uint64_t ftoid;
  95     OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));
  96
  97     set_float_exception_flags(0, &cpu->env.fp_status);
  98     ftoid = float32_to_int64(val, &cpu->env.fp_status);
  99     update_fpcsr(cpu);
 100
 101     return ftoid;
 102 }
 103
 104 uint32_t HELPER(ftois)(CPUOpenRISCState *env, uint32_t val)
 105 {
 106     uint32_t ftois;
 107     OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));
 108
 109     set_float_exception_flags(0, &cpu->env.fp_status);
 110     ftois = float32_to_int32(val, &cpu->env.fp_status);
 111     update_fpcsr(cpu);
 112
 113     return ftois;
 114 }
 115
 116 #define FLOAT_OP(name, p) void helper_float_##_##p(void)
 117
 118 #define FLOAT_CALC(name)                                                  \
 119 uint64_t helper_float_ ## name ## _d(CPUOpenRISCState *env,               \
 120                                      uint64_t fdt0, uint64_t fdt1)        \
 121 {                                                                         \
 122     uint64_t result;                                                      \
 123     OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));                    \
 124     set_float_exception_flags(0, &cpu->env.fp_status);                    \
 125     result = float64_ ## name(fdt0, fdt1, &cpu->env.fp_status);           \
 126     update_fpcsr(cpu);                                                    \
 127     return result;                                                        \
 128 }                                                                         \
 129                                                                           \
 130 uint32_t helper_float_ ## name ## _s(CPUOpenRISCState *env,               \
 131                                      uint32_t fdt0, uint32_t fdt1)        \
 132 {                                                                         \
 133     uint32_t result;                                                      \
 134     OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));                    \
 135     set_float_exception_flags(0, &cpu->env.fp_status);                    \
 136     result = float32_ ## name(fdt0, fdt1, &cpu->env.fp_status);           \
 137     update_fpcsr(cpu);                                                    \
 138     return result;                                                        \
 139 }                                                                         \
 140
 141 FLOAT_CALC(add)
 142 FLOAT_CALC(sub)
 143 FLOAT_CALC(mul)
 144 FLOAT_CALC(div)
 145 FLOAT_CALC(rem)
 146 #undef FLOAT_CALC
 147
 148 #define FLOAT_TERNOP(name1, name2)                                        \
 149 uint64_t helper_float_ ## name1 ## name2 ## _d(CPUOpenRISCState *env,     \
 150                                                uint64_t fdt0,             \
 151                                                uint64_t fdt1)             \
 152 {                                                                         \
 153     uint64_t result, temp, hi, lo;                                        \
 154     uint32_t val1, val2;                                                  \
 155     OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));                    \
 156     hi = env->fpmaddhi;                                                   \
 157     lo = env->fpmaddlo;                                                   \
 158     set_float_exception_flags(0, &cpu->env.fp_status);                    \
 159     result = float64_ ## name1(fdt0, fdt1, &cpu->env.fp_status);          \
 160     lo &= 0xffffffff;                                                     \
 161     hi &= 0xffffffff;                                                     \
 162     temp = (hi << 32) | lo;                                               \
 163     result = float64_ ## name2(result, temp, &cpu->env.fp_status);        \
 164     val1 = result >> 32;                                                  \
 165     val2 = (uint32_t) (result & 0xffffffff);                              \
 166     update_fpcsr(cpu);                                                    \
 167     cpu->env.fpmaddlo = val2;                                             \
 168     cpu->env.fpmaddhi = val1;                                             \
 169     return 0;                                                             \
 170 }                                                                         \
 171                                                                           \
 172 uint32_t helper_float_ ## name1 ## name2 ## _s(CPUOpenRISCState *env,     \
 173                                             uint32_t fdt0, uint32_t fdt1) \
 174 {                                                                         \
 175     uint64_t result, temp, hi, lo;                                        \
 176     uint32_t val1, val2;                                                  \
 177     OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));                    \
 178     hi = cpu->env.fpmaddhi;                                               \
 179     lo = cpu->env.fpmaddlo;                                               \
 180     set_float_exception_flags(0, &cpu->env.fp_status);                    \
 181     result = float64_ ## name1(fdt0, fdt1, &cpu->env.fp_status);          \
 182     temp = (hi << 32) | lo;                                               \
 183     result = float64_ ## name2(result, temp, &cpu->env.fp_status);        \
 184     val1 = result >> 32;                                                  \
 185     val2 = (uint32_t) (result & 0xffffffff);                              \
 186     update_fpcsr(cpu);                                                    \
 187     cpu->env.fpmaddlo = val2;                                             \
 188     cpu->env.fpmaddhi = val1;                                             \
 189     return 0;                                                             \
 190 }
 191
 192 FLOAT_TERNOP(mul, add)
 193 #undef FLOAT_TERNOP
 194
 195
 196 #define FLOAT_CMP(name)                                                   \
 197 uint64_t helper_float_ ## name ## _d(CPUOpenRISCState *env,               \
 198                                      uint64_t fdt0, uint64_t fdt1)        \
 199 {                                                                         \
 200     int res;                                                              \
 201     OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));                    \
 202     set_float_exception_flags(0, &cpu->env.fp_status);                    \
 203     res = float64_ ## name(fdt0, fdt1, &cpu->env.fp_status);              \
 204     update_fpcsr(cpu);                                                    \
 205     return res;                                                           \
 206 }                                                                         \
 207                                                                           \
 208 uint32_t helper_float_ ## name ## _s(CPUOpenRISCState *env,               \
 209                                              uint32_t fdt0, uint32_t fdt1)\
 210 {                                                                         \
 211     int res;                                                              \
 212     OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));                    \
 213     set_float_exception_flags(0, &cpu->env.fp_status);                    \
 214     res = float32_ ## name(fdt0, fdt1, &cpu->env.fp_status);              \
 215     update_fpcsr(cpu);                                                    \
 216     return res;                                                           \
 217 }
 218
 219 FLOAT_CMP(le)
 220 FLOAT_CMP(eq)
 221 FLOAT_CMP(lt)
 222 #undef FLOAT_CMP
 223
 224
 225 #define FLOAT_CMPNE(name)                                                 \
 226 uint64_t helper_float_ ## name ## _d(CPUOpenRISCState *env,               \
 227                                      uint64_t fdt0, uint64_t fdt1)        \
 228 {                                                                         \
 229     int res;                                                              \
 230     OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));                    \
 231     set_float_exception_flags(0, &cpu->env.fp_status);                    \
 232     res = !float64_eq_quiet(fdt0, fdt1, &cpu->env.fp_status);             \
 233     update_fpcsr(cpu);                                                    \
 234     return res;                                                           \
 235 }                                                                         \
 236                                                                           \
 237 uint32_t helper_float_ ## name ## _s(CPUOpenRISCState *env,               \
 238                                      uint32_t fdt0, uint32_t fdt1)        \
 239 {                                                                         \
 240     int res;                                                              \
 241     OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));                    \
 242     set_float_exception_flags(0, &cpu->env.fp_status);                    \
 243     res = !float32_eq_quiet(fdt0, fdt1, &cpu->env.fp_status);             \
 244     update_fpcsr(cpu);                                                    \
 245     return res;                                                           \
 246 }
 247
 248 FLOAT_CMPNE(ne)
 249 #undef FLOAT_CMPNE
 250
 251 #define FLOAT_CMPGT(name)                                                 \
 252 uint64_t helper_float_ ## name ## _d(CPUOpenRISCState *env,               \
 253                                      uint64_t fdt0, uint64_t fdt1)        \
 254 {                                                                         \
 255     int res;                                                              \
 256     OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));                    \
 257     set_float_exception_flags(0, &cpu->env.fp_status);                    \
 258     res = !float64_le(fdt0, fdt1, &cpu->env.fp_status);                   \
 259     update_fpcsr(cpu);                                                    \
 260     return res;                                                           \
 261 }                                                                         \
 262                                                                           \
 263 uint32_t helper_float_ ## name ## _s(CPUOpenRISCState *env,               \
 264                                      uint32_t fdt0, uint32_t fdt1)        \
 265 {                                                                         \
 266     int res;                                                              \
 267     OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));                    \
 268     set_float_exception_flags(0, &cpu->env.fp_status);                    \
 269     res = !float32_le(fdt0, fdt1, &cpu->env.fp_status);                   \
 270     update_fpcsr(cpu);                                                    \
 271     return res;                                                           \
 272 }
 273 FLOAT_CMPGT(gt)
 274 #undef FLOAT_CMPGT
 275
 276 #define FLOAT_CMPGE(name)                                                 \
 277 uint64_t helper_float_ ## name ## _d(CPUOpenRISCState *env,               \
 278                                      uint64_t fdt0, uint64_t fdt1)        \
 279 {                                                                         \
 280     int res;                                                              \
 281     OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));                    \
 282     set_float_exception_flags(0, &cpu->env.fp_status);                    \
 283     res = !float64_lt(fdt0, fdt1, &cpu->env.fp_status);                   \
 284     update_fpcsr(cpu);                                                    \
 285     return res;                                                           \
 286 }                                                                         \
 287                                                                           \
 288 uint32_t helper_float_ ## name ## _s(CPUOpenRISCState *env,               \
 289                                      uint32_t fdt0, uint32_t fdt1)        \
 290 {                                                                         \
 291     int res;                                                              \
 292     OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));                    \
 293     set_float_exception_flags(0, &cpu->env.fp_status);                    \
 294     res = !float32_lt(fdt0, fdt1, &cpu->env.fp_status);                   \
 295     update_fpcsr(cpu);                                                    \
 296     return res;                                                           \
 297 }
 298
 299 FLOAT_CMPGE(ge)
 300 #undef FLOAT_CMPGE