lib/c++/stlport/sparc_atomic.s

   1         .section        ".text",#alloc,#execinstr
   2           .align 8
   3           .skip 16
   4
   5
   6   /*
   7   **  int _STLP_atomic_exchange (void *pvalue, int value)
   8   */
   9
  10           .type   _STLP_atomic_exchange,#function
  11           .global _STLP_atomic_exchange
  12           .align  8
  13
  14 _STLP_atomic_exchange:
  15 0:
  16           ld      [%o0], %o2              ! Set the current value
  17           mov     %o1, %o3                ! Set the new value
  18 !          swap     [%o0], %o3             ! Do the compare and swap
  19           cas     [%o0], %o2, %o3
  20           cmp     %o2, %o3                ! Check whether successful
  21           bne     0b                      ! Retry upon failure
  22           stbar
  23           mov     %o2, %o0                ! Set the new value
  24           retl                            ! return
  25           nop
  26           .size   _STLP_atomic_exchange,(.-_STLP_atomic_exchange)
  27
  28   /* int _STLP_atomic_increment (void *pvalue) */
  29
  30           .type   _STLP_atomic_increment,#function
  31           .global _STLP_atomic_increment
  32           .align  8
  33 _STLP_atomic_increment:
  34 1:
  35           ld      [%o0], %o2              ! set the current
  36           add             %o2, 0x1, %o3                   ! Increment and store current
  37 !          swap     [%o0], %o3         ! Do the compare and swap
  38           cas     [%o0], %o2, %o3
  39           cmp     %o3, %o2                ! Check whether successful
  40           bne     1b                                         ! Retry if we failed.
  41           membar  #LoadLoad | #LoadStore  ! Ensure the cas finishes before
  42                                           ! returning
  43           nop
  44           retl                            ! return
  45           nop
  46
  47           .size   _STLP_atomic_increment,(.-_STLP_atomic_increment)
  48
  49
  50   /* int _STLP_atomic_decrement (void *pvalue) */
  51           .type   _STLP_atomic_decrement,#function
  52           .global _STLP_atomic_decrement
  53           .align  8
  54
  55 _STLP_atomic_decrement:
  56 2:
  57           ld      [%o0], %o2              ! set the current
  58           sub     %o2, 0x1, %o3                   ! decrement and store current
  59 !          swap    [%o0], %o3         ! Do the compare and swap
  60           cas     [%o0], %o2, %o3
  61           cmp     %o3, %o2                ! Check whether successful
  62           bne     2b                                         ! Retry if we failed.
  63           membar  #LoadLoad | #LoadStore  ! Ensure the cas finishes before
  64           nop
  65                                           ! returning
  66           retl                            ! return
  67           nop
  68           .size   _STLP_atomic_decrement,(.-_STLP_atomic_decrement)