106 lines
2.2 KiB
C
106 lines
2.2 KiB
C
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/*
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* Fused Multiply Add (Single)
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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_inputs(float a, float b, float c)
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{
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char *a_fmt, *b_fmt, *c_fmt;
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a_fmt = fmt_f32(a);
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b_fmt = fmt_f32(b);
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c_fmt = fmt_f32(c);
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printf("op : %s * %s + %s\n", a_fmt, b_fmt, c_fmt);
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free(a_fmt);
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free(b_fmt);
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free(c_fmt);
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}
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static void print_result(float r, int j, int k)
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{
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char *r_fmt, *flag_fmt;
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flag_fmt = fmt_flags();
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r_fmt = fmt_f32(r);
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printf("res: %s flags=%s (%d/%d)\n", r_fmt, flag_fmt, j, k);
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free(r_fmt);
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free(flag_fmt);
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}
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static void do_madds(float a, float b, float c, int j, int k)
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{
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float r;
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print_inputs(a, b, c);
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feclearexcept(FE_ALL_EXCEPT);
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r = __builtin_fmaf(a, b, c);
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print_result(r, j, k);
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}
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int main(int argc, char *argv[argc])
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{
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int i, j, k, nums = get_num_f32();
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float a, b, c;
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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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for (k = 0; k < 3; k++) {
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a = get_f32(j + ((k)%3));
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b = get_f32(j + ((k+1)%3));
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c = get_f32(j + ((k+2)%3));
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do_madds(a, b, c, j, k);
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}
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}
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/* From https://bugs.launchpad.net/qemu/+bug/1841491 */
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printf("# LP184149\n");
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do_madds(0x1.ffffffffffffcp-1022, 0x1.0000000000001p-1, 0x0.0000000000001p-1022, j, 0);
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do_madds(0x8p-152, 0x8p-152, 0x8p-152, j+1, 0);
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}
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return 0;
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}
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