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37 lines
629 B
C
37 lines
629 B
C
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/* PR middle-end/36106 */
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/* { dg-options "-O2" } */
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/* { dg-options "-O2 -march=i586" { target { { i?86-*-* x86_64-*-* } && ilp32 } } } */
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#ifdef __i386__
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# include "../../../gcc/config/i386/cpuid.h"
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#endif
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extern void abort (void);
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union { unsigned long long l; double d; } u = { .l = 0x7ff0000000072301ULL };
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int __attribute__((noinline))
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do_test (void)
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{
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#pragma omp atomic
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u.d += 1.0L;
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return 0;
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}
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int
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main (void)
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{
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#ifdef __i386__
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unsigned int eax, ebx, ecx, edx;
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if (!__get_cpuid (1, &eax, &ebx, &ecx, &edx))
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return 0;
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if (edx & bit_CMPXCHG8B)
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do_test ();
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#else
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do_test ();
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#endif
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return 0;
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}
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