xref: /qemu/target/m68k/fpu_helper.c (revision f83311e4764f1f25a8abdec2b32c64483be1759b)

/*
 *  m68k FPU helpers
 *
 *  Copyright (c) 2006-2007 CodeSourcery
 *  Written by Paul Brook
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 */

#include "qemu/osdep.h"
#include "cpu.h"
#include "exec/helper-proto.h"
#include "exec/exec-all.h"

int32_t HELPER(reds32)(CPUM68KState *env, FPReg *val)
{
    return floatx80_to_int32(val->d, &env->fp_status);
}

float32 HELPER(redf32)(CPUM68KState *env, FPReg *val)
{
    return floatx80_to_float32(val->d, &env->fp_status);
}

void HELPER(exts32)(CPUM68KState *env, FPReg *res, int32_t val)
{
    res->d = int32_to_floatx80(val, &env->fp_status);
}

void HELPER(extf32)(CPUM68KState *env, FPReg *res, float32 val)
{
    res->d = float32_to_floatx80(val, &env->fp_status);
}

void HELPER(extf64)(CPUM68KState *env, FPReg *res, float64 val)
{
    res->d = float64_to_floatx80(val, &env->fp_status);
}

float64 HELPER(redf64)(CPUM68KState *env, FPReg *val)
{
    return floatx80_to_float64(val->d, &env->fp_status);
}

void HELPER(firound)(CPUM68KState *env, FPReg *res, FPReg *val)
{
    res->d = floatx80_round_to_int(val->d, &env->fp_status);
}

void HELPER(fitrunc)(CPUM68KState *env, FPReg *res, FPReg *val)
{
    res->d = floatx80_round_to_int(val->d, &env->fp_status);
}

void HELPER(fsqrt)(CPUM68KState *env, FPReg *res, FPReg *val)
{
    res->d = floatx80_sqrt(val->d, &env->fp_status);
}

void HELPER(fabs)(CPUM68KState *env, FPReg *res, FPReg *val)
{
    res->d = floatx80_abs(val->d);
}

void HELPER(fchs)(CPUM68KState *env, FPReg *res, FPReg *val)
{
    res->d = floatx80_chs(val->d);
}

void HELPER(fadd)(CPUM68KState *env, FPReg *res, FPReg *val0, FPReg *val1)
{
    res->d = floatx80_add(val0->d, val1->d, &env->fp_status);
}

void HELPER(fsub)(CPUM68KState *env, FPReg *res, FPReg *val0, FPReg *val1)
{
    res->d = floatx80_sub(val1->d, val0->d, &env->fp_status);
}

void HELPER(fmul)(CPUM68KState *env, FPReg *res, FPReg *val0, FPReg *val1)
{
    res->d = floatx80_mul(val0->d, val1->d, &env->fp_status);
}

void HELPER(fdiv)(CPUM68KState *env, FPReg *res, FPReg *val0, FPReg *val1)
{
    res->d = floatx80_div(val1->d, val0->d, &env->fp_status);
}

void HELPER(fsub_cmp)(CPUM68KState *env, FPReg *res, FPReg *val0, FPReg *val1)
{
    /* ??? This may incorrectly raise exceptions.  */
    /* ??? Should flush denormals to zero.  */
    res->d = floatx80_sub(val0->d, val1->d, &env->fp_status);
    if (floatx80_is_quiet_nan(res->d, &env->fp_status)) {
        /* +/-inf compares equal against itself, but sub returns nan.  */
        if (!floatx80_is_quiet_nan(val0->d, &env->fp_status)
            && !floatx80_is_quiet_nan(val1->d, &env->fp_status)) {
            res->d = floatx80_zero;
            if (floatx80_lt_quiet(val0->d, res->d, &env->fp_status)) {
                res->d = floatx80_chs(res->d);
            }
        }
    }
}

uint32_t HELPER(fcompare)(CPUM68KState *env, FPReg *val)
{
    return floatx80_compare_quiet(val->d, floatx80_zero, &env->fp_status);
}