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 "qemu/osdep.h"
  22 #include "cpu.h"
  23 #include "exec/helper-proto.h"
  24 #include "exception.h"
  25 #include "fpu/softfloat.h"
  26
  27 static int ieee_ex_to_openrisc(int fexcp)
  28 {
  29     int ret = 0;
  30     if (fexcp & float_flag_invalid) {
  31         ret |= FPCSR_IVF;
  32     }
  33     if (fexcp & float_flag_overflow) {
  34         ret |= FPCSR_OVF;
  35     }
  36     if (fexcp & float_flag_underflow) {
  37         ret |= FPCSR_UNF;
  38     }
  39     if (fexcp & float_flag_divbyzero) {
  40         ret |= FPCSR_DZF;
  41     }
  42     if (fexcp & float_flag_inexact) {
  43         ret |= FPCSR_IXF;
  44     }
  45     return ret;
  46 }
  47
  48 void HELPER(update_fpcsr)(CPUOpenRISCState *env)
  49 {
  50     int tmp = get_float_exception_flags(&env->fp_status);
  51
  52     if (tmp) {
  53         set_float_exception_flags(0, &env->fp_status);
  54         tmp = ieee_ex_to_openrisc(tmp);
  55         if (tmp) {
  56             env->fpcsr |= tmp;
  57             if (env->fpcsr & FPCSR_FPEE) {
  58                 helper_exception(env, EXCP_FPE);
  59             }
  60         }
  61     }
  62 }
  63
  64 uint64_t HELPER(itofd)(CPUOpenRISCState *env, uint64_t val)
  65 {
  66     return int32_to_float64(val, &env->fp_status);
  67 }
  68
  69 uint32_t HELPER(itofs)(CPUOpenRISCState *env, uint32_t val)
  70 {
  71     return int32_to_float32(val, &env->fp_status);
  72 }
  73
  74 uint64_t HELPER(ftoid)(CPUOpenRISCState *env, uint64_t val)
  75 {
  76     return float32_to_int64(val, &env->fp_status);
  77 }
  78
  79 uint32_t HELPER(ftois)(CPUOpenRISCState *env, uint32_t val)
  80 {
  81     return float32_to_int32(val, &env->fp_status);
  82 }
  83
  84 #define FLOAT_CALC(name)                                                  \
  85 uint64_t helper_float_ ## name ## _d(CPUOpenRISCState *env,               \
  86                                      uint64_t fdt0, uint64_t fdt1)        \
  87 { return float64_ ## name(fdt0, fdt1, &env->fp_status); }                 \
  88 uint32_t helper_float_ ## name ## _s(CPUOpenRISCState *env,               \
  89                                      uint32_t fdt0, uint32_t fdt1)        \
  90 { return float32_ ## name(fdt0, fdt1, &env->fp_status); }
  91
  92 FLOAT_CALC(add)
  93 FLOAT_CALC(sub)
  94 FLOAT_CALC(mul)
  95 FLOAT_CALC(div)
  96 FLOAT_CALC(rem)
  97 #undef FLOAT_CALC
  98
  99
 100 uint64_t helper_float_madd_d(CPUOpenRISCState *env, uint64_t a,
 101                              uint64_t b, uint64_t c)
 102 {
 103     /* Note that or1ksim doesn't use fused operation.  */
 104     b = float64_mul(b, c, &env->fp_status);
 105     return float64_add(a, b, &env->fp_status);
 106 }
 107
 108 uint32_t helper_float_madd_s(CPUOpenRISCState *env, uint32_t a,
 109                              uint32_t b, uint32_t c)
 110 {
 111     /* Note that or1ksim doesn't use fused operation.  */
 112     b = float32_mul(b, c, &env->fp_status);
 113     return float32_add(a, b, &env->fp_status);
 114 }
 115
 116
 117 #define FLOAT_CMP(name, impl)                                             \
 118 target_ulong helper_float_ ## name ## _d(CPUOpenRISCState *env,           \
 119                                          uint64_t fdt0, uint64_t fdt1)    \
 120 { return float64_ ## impl(fdt0, fdt1, &env->fp_status); }                 \
 121 target_ulong helper_float_ ## name ## _s(CPUOpenRISCState *env,           \
 122                                          uint32_t fdt0, uint32_t fdt1)    \
 123 { return float32_ ## impl(fdt0, fdt1, &env->fp_status); }
 124
 125 FLOAT_CMP(le, le)
 126 FLOAT_CMP(lt, lt)
 127 FLOAT_CMP(eq, eq_quiet)
 128 #undef FLOAT_CMP