lib/c++/stlport/sparc_atomic64.s

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