| 1 | /* |
| 2 | * Floating Point Convert Doubles to Various |
| 3 | * |
| 4 | * Copyright (c) 2019, 2024 Linaro |
| 5 | * |
| 6 | * SPDX-License-Identifier: GPL-2.0-or-later |
| 7 | */ |
| 8 | |
| 9 | #include <stdio.h> |
| 10 | #include <stdlib.h> |
| 11 | #include <math.h> |
| 12 | #include <float.h> |
| 13 | #include <fenv.h> |
| 14 | |
| 15 | |
| 16 | #include "float_helpers.h" |
| 17 | |
| 18 | #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) |
| 19 | |
| 20 | typedef struct { |
| 21 | int flag; |
| 22 | char *desc; |
| 23 | } float_mapping; |
| 24 | |
| 25 | float_mapping round_flags[] = { |
| 26 | { FE_TONEAREST, "to nearest" }, |
| 27 | #ifdef FE_UPWARD |
| 28 | { FE_UPWARD, "upwards" }, |
| 29 | #endif |
| 30 | #ifdef FE_DOWNWARD |
| 31 | { FE_DOWNWARD, "downwards" }, |
| 32 | #endif |
| 33 | #ifdef FE_TOWARDZERO |
| 34 | { FE_TOWARDZERO, "to zero" } |
| 35 | #endif |
| 36 | }; |
| 37 | |
| 38 | static void print_input(double input) |
| 39 | { |
| 40 | char *in_fmt = fmt_f64(input); |
| 41 | printf("from double: %s\n", in_fmt); |
| 42 | free(in_fmt); |
| 43 | } |
| 44 | |
| 45 | static void convert_double_to_single(double input) |
| 46 | { |
| 47 | float output; |
| 48 | char *out_fmt, *flag_fmt; |
| 49 | |
| 50 | feclearexcept(FE_ALL_EXCEPT); |
| 51 | |
| 52 | output = input; |
| 53 | |
| 54 | flag_fmt = fmt_flags(); |
| 55 | out_fmt = fmt_f32(output); |
| 56 | printf(" to single: %s (%s)\n", out_fmt, flag_fmt); |
| 57 | free(out_fmt); |
| 58 | free(flag_fmt); |
| 59 | } |
| 60 | |
| 61 | #define xstr(a) str(a) |
| 62 | #define str(a) #a |
| 63 | |
| 64 | #define CONVERT_DOUBLE_TO_INT(TYPE, FMT) \ |
| 65 | static void convert_double_to_ ## TYPE(double input) \ |
| 66 | { \ |
| 67 | TYPE ## _t output; \ |
| 68 | char *flag_fmt; \ |
| 69 | const char to[] = "to " xstr(TYPE); \ |
| 70 | feclearexcept(FE_ALL_EXCEPT); \ |
| 71 | output = input; \ |
| 72 | flag_fmt = fmt_flags(); \ |
| 73 | printf("%11s: %" FMT " (%s)\n", to, output, flag_fmt); \ |
| 74 | free(flag_fmt); \ |
| 75 | } |
| 76 | |
| 77 | CONVERT_DOUBLE_TO_INT( int32, PRId32) |
| 78 | CONVERT_DOUBLE_TO_INT(uint32, PRId32) |
| 79 | CONVERT_DOUBLE_TO_INT( int64, PRId64) |
| 80 | CONVERT_DOUBLE_TO_INT(uint64, PRId64) |
| 81 | |
| 82 | int main(int argc, char *argv[argc]) |
| 83 | { |
| 84 | int i, j, nums; |
| 85 | |
| 86 | nums = get_num_f64(); |
| 87 | |
| 88 | for (i = 0; i < ARRAY_SIZE(round_flags); ++i) { |
| 89 | if (fesetround(round_flags[i].flag) != 0) { |
| 90 | printf("### Rounding %s skipped\n", round_flags[i].desc); |
| 91 | continue; |
| 92 | } |
| 93 | printf("### Rounding %s\n", round_flags[i].desc); |
| 94 | for (j = 0; j < nums; j++) { |
| 95 | double input = get_f64(j); |
| 96 | print_input(input); |
| 97 | convert_double_to_single(input); |
| 98 | convert_double_to_int32(input); |
| 99 | convert_double_to_int64(input); |
| 100 | convert_double_to_uint32(input); |
| 101 | convert_double_to_uint64(input); |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | return 0; |
| 106 | } |