target/xtensa/fpu_helper.c

   1 /*
   2  * Copyright (c) 2011 - 2019, Max Filippov, Open Source and Linux Lab.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are met:
   7  *     * Redistributions of source code must retain the above copyright
   8  *       notice, this list of conditions and the following disclaimer.
   9  *     * Redistributions in binary form must reproduce the above copyright
  10  *       notice, this list of conditions and the following disclaimer in the
  11  *       documentation and/or other materials provided with the distribution.
  12  *     * Neither the name of the Open Source and Linux Lab nor the
  13  *       names of its contributors may be used to endorse or promote products
  14  *       derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  17  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  20  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  21  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  23  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  25  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include "qemu/osdep.h"
  29 #include "qemu/main-loop.h"
  30 #include "cpu.h"
  31 #include "exec/helper-proto.h"
  32 #include "qemu/host-utils.h"
  33 #include "exec/exec-all.h"
  34 #include "fpu/softfloat.h"
  35
  36 void HELPER(wur_fcr)(CPUXtensaState *env, uint32_t v)
  37 {
  38     static const int rounding_mode[] = {
  39         float_round_nearest_even,
  40         float_round_to_zero,
  41         float_round_up,
  42         float_round_down,
  43     };
  44
  45     env->uregs[FCR] = v & 0xfffff07f;
  46     set_float_rounding_mode(rounding_mode[v & 3], &env->fp_status);
  47 }
  48
  49 float32 HELPER(abs_s)(float32 v)
  50 {
  51     return float32_abs(v);
  52 }
  53
  54 float32 HELPER(neg_s)(float32 v)
  55 {
  56     return float32_chs(v);
  57 }
  58
  59 float32 HELPER(add_s)(CPUXtensaState *env, float32 a, float32 b)
  60 {
  61     return float32_add(a, b, &env->fp_status);
  62 }
  63
  64 float32 HELPER(sub_s)(CPUXtensaState *env, float32 a, float32 b)
  65 {
  66     return float32_sub(a, b, &env->fp_status);
  67 }
  68
  69 float32 HELPER(mul_s)(CPUXtensaState *env, float32 a, float32 b)
  70 {
  71     return float32_mul(a, b, &env->fp_status);
  72 }
  73
  74 float32 HELPER(madd_s)(CPUXtensaState *env, float32 a, float32 b, float32 c)
  75 {
  76     return float32_muladd(b, c, a, 0, &env->fp_status);
  77 }
  78
  79 float32 HELPER(msub_s)(CPUXtensaState *env, float32 a, float32 b, float32 c)
  80 {
  81     return float32_muladd(b, c, a, float_muladd_negate_product,
  82                           &env->fp_status);
  83 }
  84
  85 uint32_t HELPER(ftoi)(float32 v, uint32_t rounding_mode, uint32_t scale)
  86 {
  87     float_status fp_status = {0};
  88
  89     set_float_rounding_mode(rounding_mode, &fp_status);
  90     return float32_to_int32(float32_scalbn(v, scale, &fp_status), &fp_status);
  91 }
  92
  93 uint32_t HELPER(ftoui)(float32 v, uint32_t rounding_mode, uint32_t scale)
  94 {
  95     float_status fp_status = {0};
  96     float32 res;
  97
  98     set_float_rounding_mode(rounding_mode, &fp_status);
  99
 100     res = float32_scalbn(v, scale, &fp_status);
 101
 102     if (float32_is_neg(v) && !float32_is_any_nan(v)) {
 103         return float32_to_int32(res, &fp_status);
 104     } else {
 105         return float32_to_uint32(res, &fp_status);
 106     }
 107 }
 108
 109 float32 HELPER(itof)(CPUXtensaState *env, uint32_t v, uint32_t scale)
 110 {
 111     return float32_scalbn(int32_to_float32(v, &env->fp_status),
 112                           (int32_t)scale, &env->fp_status);
 113 }
 114
 115 float32 HELPER(uitof)(CPUXtensaState *env, uint32_t v, uint32_t scale)
 116 {
 117     return float32_scalbn(uint32_to_float32(v, &env->fp_status),
 118                           (int32_t)scale, &env->fp_status);
 119 }
 120
 121 static inline void set_br(CPUXtensaState *env, bool v, uint32_t br)
 122 {
 123     if (v) {
 124         env->sregs[BR] |= br;
 125     } else {
 126         env->sregs[BR] &= ~br;
 127     }
 128 }
 129
 130 void HELPER(un_s)(CPUXtensaState *env, uint32_t br, float32 a, float32 b)
 131 {
 132     set_br(env, float32_unordered_quiet(a, b, &env->fp_status), br);
 133 }
 134
 135 void HELPER(oeq_s)(CPUXtensaState *env, uint32_t br, float32 a, float32 b)
 136 {
 137     set_br(env, float32_eq_quiet(a, b, &env->fp_status), br);
 138 }
 139
 140 void HELPER(ueq_s)(CPUXtensaState *env, uint32_t br, float32 a, float32 b)
 141 {
 142     int v = float32_compare_quiet(a, b, &env->fp_status);
 143     set_br(env, v == float_relation_equal || v == float_relation_unordered, br);
 144 }
 145
 146 void HELPER(olt_s)(CPUXtensaState *env, uint32_t br, float32 a, float32 b)
 147 {
 148     set_br(env, float32_lt_quiet(a, b, &env->fp_status), br);
 149 }
 150
 151 void HELPER(ult_s)(CPUXtensaState *env, uint32_t br, float32 a, float32 b)
 152 {
 153     int v = float32_compare_quiet(a, b, &env->fp_status);
 154     set_br(env, v == float_relation_less || v == float_relation_unordered, br);
 155 }
 156
 157 void HELPER(ole_s)(CPUXtensaState *env, uint32_t br, float32 a, float32 b)
 158 {
 159     set_br(env, float32_le_quiet(a, b, &env->fp_status), br);
 160 }
 161
 162 void HELPER(ule_s)(CPUXtensaState *env, uint32_t br, float32 a, float32 b)
 163 {
 164     int v = float32_compare_quiet(a, b, &env->fp_status);
 165     set_br(env, v != float_relation_greater, br);
 166 }