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Hexagon (target/hexagon/conv_emu.[ch]) utility functions
Signed-off-by: Taylor Simpson <tsimpson@quicinc.com> Message-Id: <1612763186-18161-17-git-send-email-tsimpson@quicinc.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
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Taylor Simpson
Richard Henderson
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b239168178
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62d6bb500e
177
target/hexagon/conv_emu.c
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177
target/hexagon/conv_emu.c
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/*
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* Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "qemu/host-utils.h"
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#include "fpu/softfloat.h"
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#include "macros.h"
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#include "conv_emu.h"
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#define LL_MAX_POS 0x7fffffffffffffffULL
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#define MAX_POS 0x7fffffffU
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static uint64_t conv_f64_to_8u_n(float64 in, int will_negate,
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float_status *fp_status)
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{
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uint8_t sign = float64_is_neg(in);
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if (float64_is_infinity(in)) {
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float_raise(float_flag_invalid, fp_status);
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if (float64_is_neg(in)) {
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return 0ULL;
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} else {
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return ~0ULL;
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}
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}
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if (float64_is_any_nan(in)) {
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float_raise(float_flag_invalid, fp_status);
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return ~0ULL;
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}
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if (float64_is_zero(in)) {
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return 0;
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}
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if (sign) {
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float_raise(float_flag_invalid, fp_status);
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return 0;
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}
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if (float64_lt(in, float64_half, fp_status)) {
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/* Near zero, captures large fracshifts, denorms, etc */
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float_raise(float_flag_inexact, fp_status);
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switch (get_float_rounding_mode(fp_status)) {
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case float_round_down:
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if (will_negate) {
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return 1;
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} else {
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return 0;
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}
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case float_round_up:
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if (!will_negate) {
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return 1;
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} else {
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return 0;
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}
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default:
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return 0; /* nearest or towards zero */
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}
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}
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return float64_to_uint64(in, fp_status);
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}
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static void clr_float_exception_flags(uint8_t flag, float_status *fp_status)
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{
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uint8_t flags = fp_status->float_exception_flags;
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flags &= ~flag;
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set_float_exception_flags(flags, fp_status);
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}
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static uint32_t conv_df_to_4u_n(float64 fp64, int will_negate,
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float_status *fp_status)
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{
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uint64_t tmp;
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tmp = conv_f64_to_8u_n(fp64, will_negate, fp_status);
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if (tmp > 0x00000000ffffffffULL) {
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clr_float_exception_flags(float_flag_inexact, fp_status);
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float_raise(float_flag_invalid, fp_status);
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return ~0U;
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}
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return (uint32_t)tmp;
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}
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uint64_t conv_df_to_8u(float64 in, float_status *fp_status)
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{
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return conv_f64_to_8u_n(in, 0, fp_status);
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}
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uint32_t conv_df_to_4u(float64 in, float_status *fp_status)
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{
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return conv_df_to_4u_n(in, 0, fp_status);
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}
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int64_t conv_df_to_8s(float64 in, float_status *fp_status)
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{
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uint8_t sign = float64_is_neg(in);
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uint64_t tmp;
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if (float64_is_any_nan(in)) {
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float_raise(float_flag_invalid, fp_status);
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return -1;
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}
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if (sign) {
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float64 minus_fp64 = float64_abs(in);
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tmp = conv_f64_to_8u_n(minus_fp64, 1, fp_status);
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} else {
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tmp = conv_f64_to_8u_n(in, 0, fp_status);
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}
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if (tmp > (LL_MAX_POS + sign)) {
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clr_float_exception_flags(float_flag_inexact, fp_status);
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float_raise(float_flag_invalid, fp_status);
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tmp = (LL_MAX_POS + sign);
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}
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if (sign) {
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return -tmp;
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} else {
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return tmp;
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}
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}
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int32_t conv_df_to_4s(float64 in, float_status *fp_status)
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{
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uint8_t sign = float64_is_neg(in);
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uint64_t tmp;
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if (float64_is_any_nan(in)) {
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float_raise(float_flag_invalid, fp_status);
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return -1;
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}
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if (sign) {
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float64 minus_fp64 = float64_abs(in);
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tmp = conv_f64_to_8u_n(minus_fp64, 1, fp_status);
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} else {
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tmp = conv_f64_to_8u_n(in, 0, fp_status);
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}
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if (tmp > (MAX_POS + sign)) {
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clr_float_exception_flags(float_flag_inexact, fp_status);
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float_raise(float_flag_invalid, fp_status);
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tmp = (MAX_POS + sign);
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}
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if (sign) {
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return -tmp;
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} else {
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return tmp;
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}
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}
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uint64_t conv_sf_to_8u(float32 in, float_status *fp_status)
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{
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float64 fp64 = float32_to_float64(in, fp_status);
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return conv_df_to_8u(fp64, fp_status);
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}
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uint32_t conv_sf_to_4u(float32 in, float_status *fp_status)
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{
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float64 fp64 = float32_to_float64(in, fp_status);
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return conv_df_to_4u(fp64, fp_status);
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}
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int64_t conv_sf_to_8s(float32 in, float_status *fp_status)
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{
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float64 fp64 = float32_to_float64(in, fp_status);
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return conv_df_to_8s(fp64, fp_status);
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}
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int32_t conv_sf_to_4s(float32 in, float_status *fp_status)
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{
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float64 fp64 = float32_to_float64(in, fp_status);
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return conv_df_to_4s(fp64, fp_status);
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}
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31
target/hexagon/conv_emu.h
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31
target/hexagon/conv_emu.h
Normal file
@ -0,0 +1,31 @@
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/*
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* Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef HEXAGON_CONV_EMU_H
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#define HEXAGON_CONV_EMU_H
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uint64_t conv_sf_to_8u(float32 in, float_status *fp_status);
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uint32_t conv_sf_to_4u(float32 in, float_status *fp_status);
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int64_t conv_sf_to_8s(float32 in, float_status *fp_status);
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int32_t conv_sf_to_4s(float32 in, float_status *fp_status);
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uint64_t conv_df_to_8u(float64 in, float_status *fp_status);
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uint32_t conv_df_to_4u(float64 in, float_status *fp_status);
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int64_t conv_df_to_8s(float64 in, float_status *fp_status);
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int32_t conv_df_to_4s(float64 in, float_status *fp_status);
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#endif
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