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re PR other/56076 (Several 64-bit libgo tests FAIL in read_line_header)

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PR other/56076
runtime: Support sparc64 in lfstack.

From-SVN: r195479
This commit is contained in:
Ian Lance Taylor 2013-01-25 23:43:23 +00:00
parent 1e678aed6c
commit acc6151f4a
1 changed files with 11 additions and 2 deletions
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13
libgo/runtime/lfstack.c
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@ -15,6 +15,15 @@
# define PTR_BITS 32
#endif
#define PTR_MASK ((1ull<<PTR_BITS)-1)
#define CNT_MASK (0ull-1)
#if __SIZEOF_POINTER__ == 8 && defined(__sparc__)
// SPARC64 uses all 64 bits of virtual addresses. Use low-order three
bits as ABA counter.
#define PTR_BITS 0
#define CNT_MASK 7
#define PTR_MASK ((0ull-1)<<3)
#endif
void
runtime_lfstackpush(uint64 *head, LFNode *node)
@ -27,7 +36,7 @@ runtime_lfstackpush(uint64 *head, LFNode *node)
}
node->pushcnt++;
new = (uint64)(uintptr)node|(((uint64)node->pushcnt)<<PTR_BITS);
new = (uint64)(uintptr)node|(((uint64)node->pushcnt&CNT_MASK)<<PTR_BITS);
old = runtime_atomicload64(head);
for(;;) {
node->next = (LFNode*)(uintptr)(old&PTR_MASK);
@ -50,7 +59,7 @@ runtime_lfstackpop(uint64 *head)
node2 = runtime_atomicloadp(&node->next);
new = 0;
if(node2 != nil)
new = (uint64)(uintptr)node2|(((uint64)node2->pushcnt)<<PTR_BITS);
new = (uint64)(uintptr)node2|(((uint64)node2->pushcnt&CNT_MASK)<<PTR_BITS);
if(runtime_cas64(head, &old, new))
return node;
}