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11d9fb521d
This change implements the compiler runtime for ARM v8.1 ISE atomics and gets rid of the mandatory -mno-outline-atomics flag. It can dramatically speed things up, on newer ARM CPUs, as indicated by the changed lines in test/libc/thread/footek_test.c. In llamafile dispatching on hwcap atomic also shaved microseconds off synchronization barriers.
32 lines
2.2 KiB
C
32 lines
2.2 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 2024 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/intrin/getauxval.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sysv/consts/auxv.h"
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#include "libc/sysv/consts/hwcap.h"
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#ifdef __aarch64__
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bool __aarch64_have_lse_atomics;
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static __attribute__((__constructor__(1))) void __aarch64_atomics_init(void) {
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struct AuxiliaryValue x = __getauxval(AT_HWCAP);
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__aarch64_have_lse_atomics = !!(x.value & HWCAP_ATOMICS);
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}
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#endif /* __aarch64__ */
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