author | William Roberts <williamr@symbian.org> |
Fri, 23 Jul 2010 16:09:54 +0100 | |
branch | GCC_SURGE |
changeset 47 | d7383dba13ba |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
0
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Revision: 201002
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.section ".text",#alloc,#execinstr |
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.align 8 |
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.skip 16 |
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/* |
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** int _STLP_atomic_exchange (void *pvalue, int value) |
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*/ |
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|
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.type _STLP_atomic_exchange,#function |
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.global _STLP_atomic_exchange |
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.align 8 |
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_STLP_atomic_exchange: |
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0: |
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ld [%o0], %o2 ! Set the current value |
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mov %o1, %o3 ! Set the new value |
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! swap [%o0], %o3 ! Do the compare and swap |
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cas [%o0], %o2, %o3 |
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cmp %o2, %o3 ! Check whether successful |
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bne 0b ! Retry upon failure |
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stbar |
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mov %o2, %o0 ! Set the new value |
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retl ! return |
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nop |
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.size _STLP_atomic_exchange,(.-_STLP_atomic_exchange) |
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|
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/* int _STLP_atomic_increment (void *pvalue) */ |
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|
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.type _STLP_atomic_increment,#function |
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.global _STLP_atomic_increment |
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.align 8 |
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_STLP_atomic_increment: |
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1: |
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ld [%o0], %o2 ! set the current |
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add %o2, 0x1, %o3 ! Increment and store current |
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! swap [%o0], %o3 ! Do the compare and swap |
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cas [%o0], %o2, %o3 |
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cmp %o3, %o2 ! Check whether successful |
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bne 1b ! Retry if we failed. |
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membar #LoadLoad | #LoadStore ! Ensure the cas finishes before |
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! returning |
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nop |
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retl ! return |
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nop |
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|
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.size _STLP_atomic_increment,(.-_STLP_atomic_increment) |
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|
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|
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/* int _STLP_atomic_decrement (void *pvalue) */ |
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.type _STLP_atomic_decrement,#function |
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.global _STLP_atomic_decrement |
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.align 8 |
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|
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_STLP_atomic_decrement: |
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2: |
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ld [%o0], %o2 ! set the current |
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sub %o2, 0x1, %o3 ! decrement and store current |
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! swap [%o0], %o3 ! Do the compare and swap |
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cas [%o0], %o2, %o3 |
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cmp %o3, %o2 ! Check whether successful |
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bne 2b ! Retry if we failed. |
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membar #LoadLoad | #LoadStore ! Ensure the cas finishes before |
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nop |
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! returning |
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retl ! return |
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67 |
nop |
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.size _STLP_atomic_decrement,(.-_STLP_atomic_decrement) |