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powerpc: Enforce compiler barriers on hardware transactions

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Work around a GCC behavior with hardware transactional memory built-ins.
GCC doesn't treat the PowerPC transactional built-ins as compiler
barriers, moving instructions past the transaction boundaries and
altering their atomicity.
This commit is contained in:
Tulio Magno Quites Machado Filho
2015-12-28 12:24:43 -02:00
parent bc49a7afd3
commit 42bf1c8971
7 changed files with 58 additions and 15 deletions
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sysdeps/unix/sysv/linux/powerpc/elision-lock.c
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@ -52,12 +52,12 @@ __lll_lock_elision (int *lock, short *adapt_count, EXTRAARG int pshared)
for (int i = aconf.try_tbegin; i > 0; i--)
{
if (__builtin_tbegin (0))
if (__libc_tbegin (0))
{
if (*lock == 0)
return 0;
/* Lock was busy. Fall back to normal locking. */
__builtin_tabort (_ABORT_LOCK_BUSY);
__libc_tabort (_ABORT_LOCK_BUSY);
}
else
{