mirror of
https://github.com/mstorsjo/llvm-mingw
synced 2026-06-21 14:01:00 +00:00
Martin Storsjö
49afca5984
Test atomically loading/storing 128 bit integers on 64 bit, and 64 bit integers on 32 bit. This test case covers the root cause of https://github.com/mstorsjo/llvm-mingw/issues/538.
52 lines
1.6 KiB
C
52 lines
1.6 KiB
C
/*
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* Copyright (c) 2026 Martin Storsjo
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*
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* This file is part of llvm-mingw.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* 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 WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <stdatomic.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#ifdef __SIZEOF_INT128__
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#define TYPE __uint128_t
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#else
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#define TYPE uint64_t
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#endif
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_Atomic(TYPE) atomic_var;
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TYPE regular_var;
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int main(int argc, char **argv) {
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regular_var = 0x0123456789abcdef;
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#ifdef __SIZEOF_INT128__
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regular_var <<= 64;
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regular_var |= 0xfedcba9876543210;
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#endif
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memcpy(&atomic_var, ®ular_var, sizeof(regular_var));
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regular_var = atomic_load(&atomic_var);
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if (memcmp(&atomic_var, ®ular_var, sizeof(regular_var))) {
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printf("load failed\n");
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return 1;
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}
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atomic_store(&atomic_var, regular_var);
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if (memcmp(&atomic_var, ®ular_var, sizeof(regular_var))) {
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printf("store failed\n");
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return 1;
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}
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return 0;
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}
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