mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-07 15:03:34 +00:00
8f522cb702
This change progresses our AARCH64 support:
- The AARCH64 build and tests are now passing
- Add 128-bit floating-point support to printf()
- Fix clone() so it initializes cosmo's x28 TLS register
- Fix TLS memory layout issue with aarch64 _Alignas vars
- Revamp microbenchmarking tools so they work on aarch64
- Make some subtle improvements to aarch64 crash reporting
- Make kisdangerous() memory checks more accurate on aarch64
- Remove sys_open() since it's not available on Linux AARCH64
This change makes general improvements to Cosmo and Redbean:
- Introduce GetHostIsa() function in Redbean
- You can now feature check using pledge(0, 0)
- You can now feature check using unveil("",0)
- Refactor some more x86-specific asm comments
- Refactor and write docs for some libm functions
- Make the mmap() API behave more similar to Linux
- Fix WIFSIGNALED() which wrongly returned true for zero
- Rename some obscure cosmo keywords from noFOO to dontFOO
82 lines
3.4 KiB
C
82 lines
3.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net 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/calls/state.internal.h"
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#include "libc/calls/struct/timespec.h"
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#include "libc/dce.h"
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#include "libc/intrin/bits.h"
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#include "libc/intrin/safemacros.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/macros.internal.h"
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#include "libc/nexgen32e/rdtsc.h"
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#include "libc/nexgen32e/x86feature.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/clock.h"
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#include "libc/thread/tls.h"
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#include "libc/time/time.h"
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static struct Now {
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bool once;
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uint64_t k0;
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long double r0, cpn;
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} g_now;
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static long double GetTimeSample(void) {
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uint64_t tick1, tick2;
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long double time1, time2;
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sched_yield();
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time1 = dtime(CLOCK_MONOTONIC);
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tick1 = rdtsc();
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nanosleep(&(struct timespec){0, 1000000}, NULL);
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time2 = dtime(CLOCK_MONOTONIC);
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tick2 = rdtsc();
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return (time2 - time1) * 1e9 / MAX(1, tick2 - tick1);
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}
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static long double MeasureNanosPerCycle(void) {
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int i, n;
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long double avg, samp;
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if (__tls_enabled) __get_tls()->tib_flags |= TIB_FLAG_TIME_CRITICAL;
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if (IsWindows()) {
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n = 30;
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} else {
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n = 20;
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}
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for (avg = 1.0L, i = 1; i < n; ++i) {
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samp = GetTimeSample();
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avg += (samp - avg) / i;
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}
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if (__tls_enabled) __get_tls()->tib_flags &= ~TIB_FLAG_TIME_CRITICAL;
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STRACE("MeasureNanosPerCycle cpn*1000=%d", (long)(avg * 1000));
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return avg;
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}
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static void Refresh(void) {
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struct Now now;
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now.cpn = MeasureNanosPerCycle();
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now.r0 = dtime(CLOCK_REALTIME);
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now.k0 = rdtsc();
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now.once = true;
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memcpy(&g_now, &now, sizeof(now));
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}
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long double ConvertTicksToNanos(double ticks) {
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if (!g_now.once) Refresh();
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return ticks * g_now.cpn; /* pico scale */
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}
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