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annotate gcc/testsuite/gcc.dg/atomic-op-optimize.c @ 111:04ced10e8804

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gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
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111
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1 /* Both these atomic operations should be optimized to an exchange operation.
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2 Test that it at happens on x86 by making sure there are 2 xchg's and no
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3 compare_exchange loop. */
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4
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5 /* { dg-do compile { target { i?86-*-* x86_64-*-* } } } */
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6 /* { dg-require-effective-target sync_int_long } */
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7 /* { dg-final { scan-assembler-times "cmpxchg" 0 } } */
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8 /* { dg-final { scan-assembler-times "xchg" 2 } } */
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9
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10 int x;
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11
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12 int f()
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13 {
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14 return __atomic_fetch_and (&x, 0, __ATOMIC_RELAXED);
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15 }
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16
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17 int g()
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18 {
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19 return __atomic_fetch_or (&x, -1, __ATOMIC_RELAXED);
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20 }