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/*
* Floating Point Convert Doubles to Various
*
* Copyright (c) 2019 Linaro
*
* SPDX-License-Identifier: GPL-3.0-or-later
*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <float.h>
#include <fenv.h>
#include "float_helpers.h"
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
typedef struct {
int flag;
char *desc;
} float_mapping;
float_mapping round_flags[] = {
{ FE_TONEAREST, "to nearest" },
#ifdef FE_UPWARD
{ FE_UPWARD, "upwards" },
#endif
#ifdef FE_DOWNWARD
{ FE_DOWNWARD, "downwards" },
#endif
#ifdef FE_TOWARDZERO
{ FE_TOWARDZERO, "to zero" }
#endif
};
static void print_input(double input)
{
char *in_fmt = fmt_f64(input);
printf("from double: %s\n", in_fmt);
free(in_fmt);
}
static void convert_double_to_single(double input)
{
float output;
char *out_fmt, *flag_fmt;
feclearexcept(FE_ALL_EXCEPT);
output = input;
flag_fmt = fmt_flags();
out_fmt = fmt_f32(output);
printf(" to single: %s (%s)\n", out_fmt, flag_fmt);
free(out_fmt);
free(flag_fmt);
}
#define xstr(a) str(a)
#define str(a) #a
#define CONVERT_DOUBLE_TO_INT(TYPE, FMT) \
static void convert_double_to_ ## TYPE(double input) \
{ \
TYPE ## _t output; \
char *flag_fmt; \
const char to[] = "to " xstr(TYPE); \
feclearexcept(FE_ALL_EXCEPT); \
output = input; \
flag_fmt = fmt_flags(); \
printf("%11s: %" FMT " (%s)\n", to, output, flag_fmt); \
free(flag_fmt); \
}
CONVERT_DOUBLE_TO_INT( int32, PRId32)
CONVERT_DOUBLE_TO_INT(uint32, PRId32)
CONVERT_DOUBLE_TO_INT( int64, PRId64)
CONVERT_DOUBLE_TO_INT(uint64, PRId64)
int main(int argc, char *argv[argc])
{
int i, j, nums;
nums = get_num_f64();
for (i = 0; i < ARRAY_SIZE(round_flags); ++i) {
if (fesetround(round_flags[i].flag) != 0) {
printf("### Rounding %s skipped\n", round_flags[i].desc);
continue;
}
printf("### Rounding %s\n", round_flags[i].desc);
for (j = 0; j < nums; j++) {
double input = get_f64(j);
print_input(input);
convert_double_to_single(input);
convert_double_to_int32(input);
convert_double_to_int64(input);
convert_double_to_uint32(input);
convert_double_to_uint64(input);
}
}
return 0;
}
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