Mercurial > hg > CbC > CbC_gcc
view gcc/testsuite/gcc.dg/atomic-op-optimize.c @ 131:84e7813d76e9
gcc-8.2
author | mir3636 |
---|---|
date | Thu, 25 Oct 2018 07:37:49 +0900 |
parents | 04ced10e8804 |
children |
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/* Both these atomic operations should be optimized to an exchange operation. Test that it at happens on x86 by making sure there are 2 xchg's and no compare_exchange loop. */ /* { dg-do compile { target { i?86-*-* x86_64-*-* } } } */ /* { dg-require-effective-target sync_int_long } */ /* { dg-final { scan-assembler-times "cmpxchg" 0 } } */ /* { dg-final { scan-assembler-times "xchg" 2 } } */ int x; int f() { return __atomic_fetch_and (&x, 0, __ATOMIC_RELAXED); } int g() { return __atomic_fetch_or (&x, -1, __ATOMIC_RELAXED); }