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/*
* Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu/host-utils.h"
#include "fpu/softfloat.h"
#include "macros.h"
#include "conv_emu.h"
#define LL_MAX_POS 0x7fffffffffffffffULL
#define MAX_POS 0x7fffffffU
static uint64_t conv_f64_to_8u_n(float64 in, int will_negate,
float_status *fp_status)
{
uint8_t sign = float64_is_neg(in);
if (float64_is_infinity(in)) {
float_raise(float_flag_invalid, fp_status);
if (float64_is_neg(in)) {
return 0ULL;
} else {
return ~0ULL;
}
}
if (float64_is_any_nan(in)) {
float_raise(float_flag_invalid, fp_status);
return ~0ULL;
}
if (float64_is_zero(in)) {
return 0;
}
if (sign) {
float_raise(float_flag_invalid, fp_status);
return 0;
}
if (float64_lt(in, float64_half, fp_status)) {
/* Near zero, captures large fracshifts, denorms, etc */
float_raise(float_flag_inexact, fp_status);
switch (get_float_rounding_mode(fp_status)) {
case float_round_down:
if (will_negate) {
return 1;
} else {
return 0;
}
case float_round_up:
if (!will_negate) {
return 1;
} else {
return 0;
}
default:
return 0; /* nearest or towards zero */
}
}
return float64_to_uint64(in, fp_status);
}
static void clr_float_exception_flags(uint8_t flag, float_status *fp_status)
{
uint8_t flags = fp_status->float_exception_flags;
flags &= ~flag;
set_float_exception_flags(flags, fp_status);
}
static uint32_t conv_df_to_4u_n(float64 fp64, int will_negate,
float_status *fp_status)
{
uint64_t tmp;
tmp = conv_f64_to_8u_n(fp64, will_negate, fp_status);
if (tmp > 0x00000000ffffffffULL) {
clr_float_exception_flags(float_flag_inexact, fp_status);
float_raise(float_flag_invalid, fp_status);
return ~0U;
}
return (uint32_t)tmp;
}
uint64_t conv_df_to_8u(float64 in, float_status *fp_status)
{
return conv_f64_to_8u_n(in, 0, fp_status);
}
uint32_t conv_df_to_4u(float64 in, float_status *fp_status)
{
return conv_df_to_4u_n(in, 0, fp_status);
}
int64_t conv_df_to_8s(float64 in, float_status *fp_status)
{
uint8_t sign = float64_is_neg(in);
uint64_t tmp;
if (float64_is_any_nan(in)) {
float_raise(float_flag_invalid, fp_status);
return -1;
}
if (sign) {
float64 minus_fp64 = float64_abs(in);
tmp = conv_f64_to_8u_n(minus_fp64, 1, fp_status);
} else {
tmp = conv_f64_to_8u_n(in, 0, fp_status);
}
if (tmp > (LL_MAX_POS + sign)) {
clr_float_exception_flags(float_flag_inexact, fp_status);
float_raise(float_flag_invalid, fp_status);
tmp = (LL_MAX_POS + sign);
}
if (sign) {
return -tmp;
} else {
return tmp;
}
}
int32_t conv_df_to_4s(float64 in, float_status *fp_status)
{
uint8_t sign = float64_is_neg(in);
uint64_t tmp;
if (float64_is_any_nan(in)) {
float_raise(float_flag_invalid, fp_status);
return -1;
}
if (sign) {
float64 minus_fp64 = float64_abs(in);
tmp = conv_f64_to_8u_n(minus_fp64, 1, fp_status);
} else {
tmp = conv_f64_to_8u_n(in, 0, fp_status);
}
if (tmp > (MAX_POS + sign)) {
clr_float_exception_flags(float_flag_inexact, fp_status);
float_raise(float_flag_invalid, fp_status);
tmp = (MAX_POS + sign);
}
if (sign) {
return -tmp;
} else {
return tmp;
}
}
uint64_t conv_sf_to_8u(float32 in, float_status *fp_status)
{
float64 fp64 = float32_to_float64(in, fp_status);
return conv_df_to_8u(fp64, fp_status);
}
uint32_t conv_sf_to_4u(float32 in, float_status *fp_status)
{
float64 fp64 = float32_to_float64(in, fp_status);
return conv_df_to_4u(fp64, fp_status);
}
int64_t conv_sf_to_8s(float32 in, float_status *fp_status)
{
float64 fp64 = float32_to_float64(in, fp_status);
return conv_df_to_8s(fp64, fp_status);
}
int32_t conv_sf_to_4s(float32 in, float_status *fp_status)
{
float64 fp64 = float32_to_float64(in, fp_status);
return conv_df_to_4s(fp64, fp_status);
}
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