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MFC rev 200202:

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Fix Read-After-Write (RAW) dependency violation for ar.ccv in
isc_atomic_xadd() and isc_atomic_cmpxchg().

Approved by:	dougb@
This commit is contained in:
Marcel Moolenaar 2009-12-14 01:10:05 +00:00
parent 82c0fd73d4
commit b5a12d46d6
1 changed files with 2 additions and 2 deletions
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4
contrib/bind9/lib/isc/ia64/include/isc/atomic.h
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@ -41,7 +41,7 @@ isc_atomic_xadd(isc_int32_t *p, isc_int32_t val)
for (prev = *(volatile isc_int32_t *)p; ; prev = swapped) {
swapped = prev + val;
__asm__ volatile(
"mov ar.ccv=%2;"
"mov ar.ccv=%2;;"
"cmpxchg4.acq %0=%4,%3,ar.ccv"
: "=r" (swapped), "=m" (*p)
: "r" (prev), "r" (swapped), "m" (*p)
@ -84,7 +84,7 @@ isc_atomic_cmpxchg(isc_int32_t *p, isc_int32_t cmpval, isc_int32_t val)
isc_int32_t ret;
__asm__ volatile(
"mov ar.ccv=%2;"
"mov ar.ccv=%2;;"
"cmpxchg4.acq %0=%4,%3,ar.ccv"
: "=r" (ret), "=m" (*p)
: "r" (cmpval), "r" (val), "m" (*p)