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