mirror of
https://github.com/jart/cosmopolitan.git
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2ab9e9f7fd
- Introduce portable sched_getcpu() api - Support GCC's __target_clones__ feature - Make fma() go faster on x86 in default mode - Remove some asan checks from core libraries - WinMain() now ensures $HOME and $USER are defined
55 lines
2.9 KiB
C
55 lines
2.9 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/fmt/itoa.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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#include "libc/testlib/ezbench.h"
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#include "libc/testlib/testlib.h"
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static bool once;
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static double g_ezbenchcontrol;
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double __testlib_ezbenchcontrol(void) {
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char host[64];
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char ibuf[12];
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int Core, Tries, Interrupts;
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if (!once) {
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Tries = 0;
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do {
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__testlib_yield();
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Core = __testlib_getcore();
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Interrupts = __testlib_getinterrupts();
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g_ezbenchcontrol =
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BENCHLOOP(__startbench, __endbench, 128, donothing, (void)0);
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} while (++Tries < 10 && (__testlib_getcore() != Core &&
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__testlib_getinterrupts() > Interrupts));
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if (Tries == 10) {
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tinyprint(2, "warning: failed to accurately benchmark control\n", NULL);
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}
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strcpy(host, "unknown");
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gethostname(host, 64);
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FormatInt32(ibuf, g_ezbenchcontrol);
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tinyprint(2, "benchmarks on ", host, " (", __describe_os(),
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"; overhead of ", ibuf, " cycles)\n", NULL);
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once = true;
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}
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return g_ezbenchcontrol;
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}
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