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| author | Ben Cheng <bccheng@google.com> | 2014-03-25 22:37:19 -0700 |
|---|---|---|
| committer | Ben Cheng <bccheng@google.com> | 2014-03-25 22:37:19 -0700 |
| commit | 1bc5aee63eb72b341f506ad058502cd0361f0d10 (patch) | |
| tree | c607e8252f3405424ff15bc2d00aa38dadbb2518 /gcc-4.9/gcc/testsuite/gcc.dg/atomic-op-optimize.c | |
| parent | 283a0bf58fcf333c58a2a92c3ebbc41fb9eb1fdb (diff) | |
| download | toolchain_gcc-1bc5aee63eb72b341f506ad058502cd0361f0d10.tar.gz toolchain_gcc-1bc5aee63eb72b341f506ad058502cd0361f0d10.tar.bz2 toolchain_gcc-1bc5aee63eb72b341f506ad058502cd0361f0d10.zip | |
Initial checkin of GCC 4.9.0 from trunk (r208799).
Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba
Diffstat (limited to 'gcc-4.9/gcc/testsuite/gcc.dg/atomic-op-optimize.c')
| -rw-r--r-- | gcc-4.9/gcc/testsuite/gcc.dg/atomic-op-optimize.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/testsuite/gcc.dg/atomic-op-optimize.c b/gcc-4.9/gcc/testsuite/gcc.dg/atomic-op-optimize.c new file mode 100644 index 000000000..d2e960a0c --- /dev/null +++ b/gcc-4.9/gcc/testsuite/gcc.dg/atomic-op-optimize.c @@ -0,0 +1,20 @@ +/* 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-require-effective-target sync_int_long } */ +/* { dg-do compile { target { i?86-*-* x86_64-*-* } } } */ +/* { 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); +} |