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test_and_set.s

a guest Sep 13th, 2012 50 Never
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  1. .globl test_and_set
  2. test_and_set:
  3. 0:      dcbf    0,%r3
  4.         sync
  5.         ori     %r0,%r0,1
  6.         ori     %r0,%r0,1
  7.         ori     %r0,%r0,1
  8.         ori     %r0,%r0,1
  9.         ori     %r0,%r0,1
  10.         ori     %r0,%r0,1
  11.         isync
  12.         lwarx   %r5,0,%r3
  13.         cmpi    0,%r5,0x0000
  14.         bne     1f
  15.         stwcx.  %r4,0,%r3
  16.         bne-    0b
  17. 1:      isync
  18.         mr      %r3,%r5
  19.         blr
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