target/unicore32/ucf64_helper.c

   1 /*
   2  * UniCore-F64 simulation helpers for QEMU.
   3  *
   4  * Copyright (C) 2010-2012 Guan Xuetao
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation, or any later version.
   9  * See the COPYING file in the top-level directory.
  10  */
  11 #include "qemu/osdep.h"
  12 #include "cpu.h"
  13 #include "exec/helper-proto.h"
  14 #include "fpu/softfloat.h"
  15
  16 /*
  17  * The convention used for UniCore-F64 instructions:
  18  *  Single precition routines have a "s" suffix
  19  *  Double precision routines have a "d" suffix.
  20  */
  21
  22 /* Convert host exception flags to f64 form.  */
  23 static inline int ucf64_exceptbits_from_host(int host_bits)
  24 {
  25     int target_bits = 0;
  26
  27     if (host_bits & float_flag_invalid) {
  28         target_bits |= UCF64_FPSCR_FLAG_INVALID;
  29     }
  30     if (host_bits & float_flag_divbyzero) {
  31         target_bits |= UCF64_FPSCR_FLAG_DIVZERO;
  32     }
  33     if (host_bits & float_flag_overflow) {
  34         target_bits |= UCF64_FPSCR_FLAG_OVERFLOW;
  35     }
  36     if (host_bits & float_flag_underflow) {
  37         target_bits |= UCF64_FPSCR_FLAG_UNDERFLOW;
  38     }
  39     if (host_bits & float_flag_inexact) {
  40         target_bits |= UCF64_FPSCR_FLAG_INEXACT;
  41     }
  42     return target_bits;
  43 }
  44
  45 uint32_t HELPER(ucf64_get_fpscr)(CPUUniCore32State *env)
  46 {
  47     int i;
  48     uint32_t fpscr;
  49
  50     fpscr = (env->ucf64.xregs[UC32_UCF64_FPSCR] & UCF64_FPSCR_MASK);
  51     i = get_float_exception_flags(&env->ucf64.fp_status);
  52     fpscr |= ucf64_exceptbits_from_host(i);
  53     return fpscr;
  54 }
  55
  56 /* Convert ucf64 exception flags to target form.  */
  57 static inline int ucf64_exceptbits_to_host(int target_bits)
  58 {
  59     int host_bits = 0;
  60
  61     if (target_bits & UCF64_FPSCR_FLAG_INVALID) {
  62         host_bits |= float_flag_invalid;
  63     }
  64     if (target_bits & UCF64_FPSCR_FLAG_DIVZERO) {
  65         host_bits |= float_flag_divbyzero;
  66     }
  67     if (target_bits & UCF64_FPSCR_FLAG_OVERFLOW) {
  68         host_bits |= float_flag_overflow;
  69     }
  70     if (target_bits & UCF64_FPSCR_FLAG_UNDERFLOW) {
  71         host_bits |= float_flag_underflow;
  72     }
  73     if (target_bits & UCF64_FPSCR_FLAG_INEXACT) {
  74         host_bits |= float_flag_inexact;
  75     }
  76     return host_bits;
  77 }
  78
  79 void HELPER(ucf64_set_fpscr)(CPUUniCore32State *env, uint32_t val)
  80 {
  81     UniCore32CPU *cpu = env_archcpu(env);
  82     int i;
  83     uint32_t changed;
  84
  85     changed = env->ucf64.xregs[UC32_UCF64_FPSCR];
  86     env->ucf64.xregs[UC32_UCF64_FPSCR] = (val & UCF64_FPSCR_MASK);
  87
  88     changed ^= val;
  89     if (changed & (UCF64_FPSCR_RND_MASK)) {
  90         i = UCF64_FPSCR_RND(val);
  91         switch (i) {
  92         case 0:
  93             i = float_round_nearest_even;
  94             break;
  95         case 1:
  96             i = float_round_to_zero;
  97             break;
  98         case 2:
  99             i = float_round_up;
 100             break;
 101         case 3:
 102             i = float_round_down;
 103             break;
 104         default: /* 100 and 101 not implement */
 105             cpu_abort(CPU(cpu), "Unsupported UniCore-F64 round mode");
 106         }
 107         set_float_rounding_mode(i, &env->ucf64.fp_status);
 108     }
 109
 110     i = ucf64_exceptbits_to_host(UCF64_FPSCR_TRAPEN(val));
 111     set_float_exception_flags(i, &env->ucf64.fp_status);
 112 }
 113
 114 float32 HELPER(ucf64_adds)(float32 a, float32 b, CPUUniCore32State *env)
 115 {
 116     return float32_add(a, b, &env->ucf64.fp_status);
 117 }
 118
 119 float64 HELPER(ucf64_addd)(float64 a, float64 b, CPUUniCore32State *env)
 120 {
 121     return float64_add(a, b, &env->ucf64.fp_status);
 122 }
 123
 124 float32 HELPER(ucf64_subs)(float32 a, float32 b, CPUUniCore32State *env)
 125 {
 126     return float32_sub(a, b, &env->ucf64.fp_status);
 127 }
 128
 129 float64 HELPER(ucf64_subd)(float64 a, float64 b, CPUUniCore32State *env)
 130 {
 131     return float64_sub(a, b, &env->ucf64.fp_status);
 132 }
 133
 134 float32 HELPER(ucf64_muls)(float32 a, float32 b, CPUUniCore32State *env)
 135 {
 136     return float32_mul(a, b, &env->ucf64.fp_status);
 137 }
 138
 139 float64 HELPER(ucf64_muld)(float64 a, float64 b, CPUUniCore32State *env)
 140 {
 141     return float64_mul(a, b, &env->ucf64.fp_status);
 142 }
 143
 144 float32 HELPER(ucf64_divs)(float32 a, float32 b, CPUUniCore32State *env)
 145 {
 146     return float32_div(a, b, &env->ucf64.fp_status);
 147 }
 148
 149 float64 HELPER(ucf64_divd)(float64 a, float64 b, CPUUniCore32State *env)
 150 {
 151     return float64_div(a, b, &env->ucf64.fp_status);
 152 }
 153
 154 float32 HELPER(ucf64_negs)(float32 a)
 155 {
 156     return float32_chs(a);
 157 }
 158
 159 float64 HELPER(ucf64_negd)(float64 a)
 160 {
 161     return float64_chs(a);
 162 }
 163
 164 float32 HELPER(ucf64_abss)(float32 a)
 165 {
 166     return float32_abs(a);
 167 }
 168
 169 float64 HELPER(ucf64_absd)(float64 a)
 170 {
 171     return float64_abs(a);
 172 }
 173
 174 void HELPER(ucf64_cmps)(float32 a, float32 b, uint32_t c,
 175         CPUUniCore32State *env)
 176 {
 177     int flag;
 178     flag = float32_compare_quiet(a, b, &env->ucf64.fp_status);
 179     env->CF = 0;
 180     switch (c & 0x7) {
 181     case 0: /* F */
 182         break;
 183     case 1: /* UN */
 184         if (flag == 2) {
 185             env->CF = 1;
 186         }
 187         break;
 188     case 2: /* EQ */
 189         if (flag == 0) {
 190             env->CF = 1;
 191         }
 192         break;
 193     case 3: /* UEQ */
 194         if ((flag == 0) || (flag == 2)) {
 195             env->CF = 1;
 196         }
 197         break;
 198     case 4: /* OLT */
 199         if (flag == -1) {
 200             env->CF = 1;
 201         }
 202         break;
 203     case 5: /* ULT */
 204         if ((flag == -1) || (flag == 2)) {
 205             env->CF = 1;
 206         }
 207         break;
 208     case 6: /* OLE */
 209         if ((flag == -1) || (flag == 0)) {
 210             env->CF = 1;
 211         }
 212         break;
 213     case 7: /* ULE */
 214         if (flag != 1) {
 215             env->CF = 1;
 216         }
 217         break;
 218     }
 219     env->ucf64.xregs[UC32_UCF64_FPSCR] = (env->CF << 29)
 220                     | (env->ucf64.xregs[UC32_UCF64_FPSCR] & 0x0fffffff);
 221 }
 222
 223 void HELPER(ucf64_cmpd)(float64 a, float64 b, uint32_t c,
 224         CPUUniCore32State *env)
 225 {
 226     int flag;
 227     flag = float64_compare_quiet(a, b, &env->ucf64.fp_status);
 228     env->CF = 0;
 229     switch (c & 0x7) {
 230     case 0: /* F */
 231         break;
 232     case 1: /* UN */
 233         if (flag == 2) {
 234             env->CF = 1;
 235         }
 236         break;
 237     case 2: /* EQ */
 238         if (flag == 0) {
 239             env->CF = 1;
 240         }
 241         break;
 242     case 3: /* UEQ */
 243         if ((flag == 0) || (flag == 2)) {
 244             env->CF = 1;
 245         }
 246         break;
 247     case 4: /* OLT */
 248         if (flag == -1) {
 249             env->CF = 1;
 250         }
 251         break;
 252     case 5: /* ULT */
 253         if ((flag == -1) || (flag == 2)) {
 254             env->CF = 1;
 255         }
 256         break;
 257     case 6: /* OLE */
 258         if ((flag == -1) || (flag == 0)) {
 259             env->CF = 1;
 260         }
 261         break;
 262     case 7: /* ULE */
 263         if (flag != 1) {
 264             env->CF = 1;
 265         }
 266         break;
 267     }
 268     env->ucf64.xregs[UC32_UCF64_FPSCR] = (env->CF << 29)
 269                     | (env->ucf64.xregs[UC32_UCF64_FPSCR] & 0x0fffffff);
 270 }
 271
 272 /* Helper routines to perform bitwise copies between float and int.  */
 273 static inline float32 ucf64_itos(uint32_t i)
 274 {
 275     union {
 276         uint32_t i;
 277         float32 s;
 278     } v;
 279
 280     v.i = i;
 281     return v.s;
 282 }
 283
 284 static inline uint32_t ucf64_stoi(float32 s)
 285 {
 286     union {
 287         uint32_t i;
 288         float32 s;
 289     } v;
 290
 291     v.s = s;
 292     return v.i;
 293 }
 294
 295 /* Integer to float conversion.  */
 296 float32 HELPER(ucf64_si2sf)(float32 x, CPUUniCore32State *env)
 297 {
 298     return int32_to_float32(ucf64_stoi(x), &env->ucf64.fp_status);
 299 }
 300
 301 float64 HELPER(ucf64_si2df)(float32 x, CPUUniCore32State *env)
 302 {
 303     return int32_to_float64(ucf64_stoi(x), &env->ucf64.fp_status);
 304 }
 305
 306 /* Float to integer conversion.  */
 307 float32 HELPER(ucf64_sf2si)(float32 x, CPUUniCore32State *env)
 308 {
 309     return ucf64_itos(float32_to_int32(x, &env->ucf64.fp_status));
 310 }
 311
 312 float32 HELPER(ucf64_df2si)(float64 x, CPUUniCore32State *env)
 313 {
 314     return ucf64_itos(float64_to_int32(x, &env->ucf64.fp_status));
 315 }
 316
 317 /* floating point conversion */
 318 float64 HELPER(ucf64_sf2df)(float32 x, CPUUniCore32State *env)
 319 {
 320     return float32_to_float64(x, &env->ucf64.fp_status);
 321 }
 322
 323 float32 HELPER(ucf64_df2sf)(float64 x, CPUUniCore32State *env)
 324 {
 325     return float64_to_float32(x, &env->ucf64.fp_status);
 326 }