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.section ".text",#alloc,#execinstr
.align 8
.skip 16
! int _STLP_atomic_exchange (void *pvalue, int value)
!
.type _STLP_atomic_exchange,#function
.global _STLP_atomic_exchange
.align 8
_STLP_atomic_exchange:
1:
ldx [%o0], %o2 ! Set the current value
mov %o1, %o3 ! Set the new value
casx [%o0], %o2, %o3 ! Do the compare and swap
cmp %o2, %o3 ! Check whether successful
bne 1b ! Retry upon failure
membar #LoadLoad | #LoadStore ! Ensure the cas finishes before
! returning
retl ! return
mov %o2, %o0 ! Set the new value
.size _STLP_atomic_exchange,(.-_STLP_atomic_exchange)
! int _STLP_atomic_increment (void *pvalue)
.type _STLP_atomic_increment,#function
.global _STLP_atomic_increment
.align 8
_STLP_atomic_increment:
0:
ldx [%o0], %o2 ! set the current
addx %o2, 0x1, %o3 ! Increment and store current
casx [%o0], %o2, %o3 ! Do the compare and swap
cmp %o3, %o2 ! Check whether successful
bne 0b
membar #LoadLoad | #LoadStore ! Ensure the cas finishes before
! returning
retl ! return
mov %o1, %o0 ! Set the return value
.size _STLP_atomic_increment,(.-_STLP_atomic_increment)
! /* int _STLP_atomic_decrement (void *pvalue) */
.type _STLP_atomic_decrement,#function
.global _STLP_atomic_decrement
.align 8
_STLP_atomic_decrement:
0:
ldx [%o0], %o2 ! set the current
subx %o2, 0x1, %o3 ! decrement and store current
casx [%o0], %o2, %o3 ! Do the compare and swap
cmp %o3, %o2 ! Check whether successful
bne 0b
membar #LoadLoad | #LoadStore ! Ensure the cas finishes before
! returning
retl ! return
nop
.size _STLP_atomic_decrement,(.-_STLP_atomic_decrement)
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