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/*
* OpenRISC float helper routines
*
* Copyright (c) 2011-2012 Jia Liu <proljc@gmail.com>
* Feng Gao <gf91597@gmail.com>
*
* 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 2.1 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
* Lesser 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 "exception.h"
#include "fpu/softfloat.h"
static int ieee_ex_to_openrisc(int fexcp)
{
int ret = 0;
if (fexcp & float_flag_invalid) {
ret |= FPCSR_IVF;
}
if (fexcp & float_flag_overflow) {
ret |= FPCSR_OVF;
}
if (fexcp & float_flag_underflow) {
ret |= FPCSR_UNF;
}
if (fexcp & float_flag_divbyzero) {
ret |= FPCSR_DZF;
}
if (fexcp & float_flag_inexact) {
ret |= FPCSR_IXF;
}
return ret;
}
void HELPER(update_fpcsr)(CPUOpenRISCState *env)
{
int tmp = get_float_exception_flags(&env->fp_status);
if (tmp) {
set_float_exception_flags(0, &env->fp_status);
tmp = ieee_ex_to_openrisc(tmp);
if (tmp) {
env->fpcsr |= tmp;
if (env->fpcsr & FPCSR_FPEE) {
helper_exception(env, EXCP_FPE);
}
}
}
}
void cpu_set_fpcsr(CPUOpenRISCState *env, uint32_t val)
{
static const int rm_to_sf[] = {
float_round_nearest_even,
float_round_to_zero,
float_round_up,
float_round_down
};
env->fpcsr = val & 0x7ff;
set_float_rounding_mode(rm_to_sf[extract32(val, 1, 2)], &env->fp_status);
}
uint64_t HELPER(itofd)(CPUOpenRISCState *env, uint64_t val)
{
return int64_to_float64(val, &env->fp_status);
}
uint32_t HELPER(itofs)(CPUOpenRISCState *env, uint32_t val)
{
return int32_to_float32(val, &env->fp_status);
}
uint64_t HELPER(ftoid)(CPUOpenRISCState *env, uint64_t val)
{
return float64_to_int64_round_to_zero(val, &env->fp_status);
}
uint32_t HELPER(ftois)(CPUOpenRISCState *env, uint32_t val)
{
return float32_to_int32_round_to_zero(val, &env->fp_status);
}
uint64_t HELPER(stod)(CPUOpenRISCState *env, uint32_t val)
{
return float32_to_float64(val, &env->fp_status);
}
uint32_t HELPER(dtos)(CPUOpenRISCState *env, uint64_t val)
{
return float64_to_float32(val, &env->fp_status);
}
#define FLOAT_CALC(name) \
uint64_t helper_float_ ## name ## _d(CPUOpenRISCState *env, \
uint64_t fdt0, uint64_t fdt1) \
{ return float64_ ## name(fdt0, fdt1, &env->fp_status); } \
uint32_t helper_float_ ## name ## _s(CPUOpenRISCState *env, \
uint32_t fdt0, uint32_t fdt1) \
{ return float32_ ## name(fdt0, fdt1, &env->fp_status); }
FLOAT_CALC(add)
FLOAT_CALC(sub)
FLOAT_CALC(mul)
FLOAT_CALC(div)
FLOAT_CALC(rem)
#undef FLOAT_CALC
uint64_t helper_float_madd_d(CPUOpenRISCState *env, uint64_t a,
uint64_t b, uint64_t c)
{
/* Note that or1ksim doesn't use fused operation. */
b = float64_mul(b, c, &env->fp_status);
return float64_add(a, b, &env->fp_status);
}
uint32_t helper_float_madd_s(CPUOpenRISCState *env, uint32_t a,
uint32_t b, uint32_t c)
{
/* Note that or1ksim doesn't use fused operation. */
b = float32_mul(b, c, &env->fp_status);
return float32_add(a, b, &env->fp_status);
}
#define FLOAT_CMP(name, impl) \
target_ulong helper_float_ ## name ## _d(CPUOpenRISCState *env, \
uint64_t fdt0, uint64_t fdt1) \
{ return float64_ ## impl(fdt0, fdt1, &env->fp_status); } \
target_ulong helper_float_ ## name ## _s(CPUOpenRISCState *env, \
uint32_t fdt0, uint32_t fdt1) \
{ return float32_ ## impl(fdt0, fdt1, &env->fp_status); }
FLOAT_CMP(le, le)
FLOAT_CMP(lt, lt)
FLOAT_CMP(eq, eq_quiet)
FLOAT_CMP(un, unordered_quiet)
#undef FLOAT_CMP
#define FLOAT_UCMP(name, expr) \
target_ulong helper_float_ ## name ## _d(CPUOpenRISCState *env, \
uint64_t fdt0, uint64_t fdt1) \
{ \
int r = float64_compare_quiet(fdt0, fdt1, &env->fp_status); \
return expr; \
} \
target_ulong helper_float_ ## name ## _s(CPUOpenRISCState *env, \
uint32_t fdt0, uint32_t fdt1) \
{ \
int r = float32_compare_quiet(fdt0, fdt1, &env->fp_status); \
return expr; \
}
FLOAT_UCMP(ueq, r == float_relation_equal || r == float_relation_unordered)
FLOAT_UCMP(ult, r == float_relation_less || r == float_relation_unordered)
FLOAT_UCMP(ule, r != float_relation_greater)
#undef FLOAT_UCMP
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