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Introduce fsum()

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Justine Tunney 2021-06-11 16:49:30 -07:00
parent 8b08e81a07
commit 9504ebaf7e
4 changed files with 119 additions and 0 deletions
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3
libc/math.h
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@ -287,6 +287,9 @@ void sincos(double, double *, double *);
void sincosf(float, float *, float *);
void sincosl(long double, long double *, long double *);
float fsumf(const float *, size_t);
double fsum(const double *, size_t);
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_MATH_H_ */

31
libc/tinymath/fsum.c Normal file
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@ -0,0 +1,31 @@
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2021 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/math.h"
#include "libc/str/str.h"
/**
* Adds doubles in array.
*/
double fsum(const double *p, size_t n) {
size_t i;
double s;
if (n > 8) return fsum(p, n / 2) + fsum(p + n / 2, n - n / 2);
for (s = i = 0; i < n; ++i) s += p[i];
return s;
}

31
libc/tinymath/fsumf.c Normal file
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@ -0,0 +1,31 @@
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2021 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/math.h"
#include "libc/str/str.h"
/**
* Adds floats in array.
*/
float fsumf(const float *p, size_t n) {
float s;
size_t i;
if (n > 8) return fsumf(p, n / 2) + fsumf(p + n / 2, n - n / 2);
for (s = i = 0; i < n; ++i) s += p[i];
return s;
}

54
test/libc/tinymath/fsum_test.c Normal file
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@ -0,0 +1,54 @@
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2021 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/macros.internal.h"
#include "libc/math.h"
#include "libc/runtime/gc.internal.h"
#include "libc/testlib/ezbench.h"
#include "libc/testlib/testlib.h"
#include "libc/x/x.h"
#define N 100000
float F[N];
double D[N];
void SetUp(void) {
int i;
for (i = 0; i < N / 2; ++i) {
D[i * 2 + 0] = 1000000000.1;
D[i * 2 + 1] = 1.1;
}
for (i = 0; i < N / 2; ++i) {
F[i * 2 + 0] = 1000.1;
F[i * 2 + 1] = 1.1;
}
}
TEST(fsum, test) {
EXPECT_STREQ("500000000.6", gc(xasprintf("%.15g", fsum(D, N) / N)));
}
TEST(fsumf, test) {
EXPECT_STREQ("500.6", gc(xasprintf("%.7g", fsumf(F, N) / N)));
}
BENCH(fsum, bench) {
EZBENCH2("fsum", donothing, fsum(D, N));
EZBENCH2("fsumf", donothing, fsumf(F, N));
}