PMC_F_OLDVALUE
pmc_read_op.pm_flags = PMC_F_OLDVALUE;
pmc_rw_op.pm_flags = PMC_F_NEWVALUE | PMC_F_OLDVALUE;
if ((prw->pm_flags & (PMC_F_OLDVALUE | PMC_F_NEWVALUE)) == 0)
if ((prw->pm_flags & PMC_F_OLDVALUE) != 0) {
if ((prw->pm_flags & PMC_F_OLDVALUE) != 0)
if ((prw.pm_flags & PMC_F_OLDVALUE) != 0) {