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Last change
on this file was
2,
checked in by phkim, 11 years ago
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1.phkim
- revision copy newcon3sk r27
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-
Property svn:executable set to
*
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File size:
526 bytes
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| 1 | .text |
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| 2 | .set noreorder |
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| 3 | # Atomic compare and swap. Atomicaly reads unsigned value at addr, compares it |
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| 4 | # with compare value and if matches replaces value at addr with swap. |
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| 5 | # returns 1 if successfuly swapped value 0 if not. |
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| 6 | # extern prototype |
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| 7 | # unsigned CAS(unsigned * addr, unsigned compare, unsigned swap) |
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| 8 | .globl CAS |
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| 9 | CAS: |
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| 10 | ll $8, 0($4) |
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| 11 | bne $8, $5, exit |
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| 12 | or $2, $0, $0 |
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| 13 | sc $6, 0($4) |
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| 14 | or $2, $6, $0 |
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| 15 | exit: |
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| 16 | j $31 |
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| 17 | nop |
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| 18 | |
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