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79 lines
2.6 KiB
79 lines
2.6 KiB
5 years ago
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; call cpuid with args in eax, ecx
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; store eax, ebx, ecx, edx to p
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PUBLIC _InterlockedCompareExchange128
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.CODE
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_InterlockedCompareExchange128 PROC FRAME
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; extern "C" unsigned char _InterlockedCompareExchange128( int64 volatile * Destination, int64 ExchangeHigh, int64 ExchangeLow, int64 * ComparandResult );
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.endprolog
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; fastcall conventions:
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; RCX = Destination
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; RDX = Exchange High
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; R8 = Exchange Lo
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; R9 = ComparandResult
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; CMPXCHG16B refernece:
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; http://download.intel.com/design/processor/manuals/253666.pdf
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; Stash RBX in R11
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mov r11, rbx
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; Destination ptr to r10
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mov r10, rcx
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; RCX:RBX Exchange
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mov rcx, rdx
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mov rbx, r8
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; RDX:RAX Comparand
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mov rax, [r9]
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mov rdx, [r9+8]
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; Do the atomic operation
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lock cmpxchg16b [r10]
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; RDX:RAX now contains the value of the destination, before the atomic operation.
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; (Either it already matched and was not changed, or it did not match, in which case
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; the value has been loaded into RDX:RAX.) The _InterlockedCompareExchange128 intrinsic
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; semantics specify that this is always written out to CompareResult, so give it
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; back to the caller.
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mov [r9], rax
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mov [r9+8], rdx
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; Return value is in AL, set it equal to the zero flag
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setz al
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; Restore RBX and get out
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mov rbx, r11
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ret
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_InterlockedCompareExchange128 ENDP
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; For reference, here's what VC2010 generated
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;
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; __declspec(noinline) unsigned char Test_InterlockedCompareExchange128( int64 volatile * Destination, int64 ExchangeHigh, int64 ExchangeLow, int64 * ComparandResult )
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; {
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; return _InterlockedCompareExchange128( Destination, ExchangeHigh, ExchangeLow, ComparandResult );
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; }
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;
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;
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;?Test_InterlockedCompareExchange128@GCSDK@@YAEPEC_J_J1PEA_J@Z (unsigned char __cdecl GCSDK::Test_InterlockedCompareExchange128(__int64 volatile *,__int64,__int64,__int64 *)):
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; 0000000000000000: 48 89 5C 24 08 mov qword ptr [rsp+8],rbx
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; 0000000000000005: 49 8B 01 mov rax,qword ptr [r9]
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; 0000000000000008: 4C 8B D1 mov r10,rcx
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; 000000000000000B: 48 8B CA mov rcx,rdx
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; 000000000000000E: 49 8B 51 08 mov rdx,qword ptr [r9+8]
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; 0000000000000012: 49 8B D8 mov rbx,r8
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; 0000000000000015: F0 49 0F C7 0A lock cmpxchg16b oword ptr [r10]
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; 000000000000001A: 48 8B 5C 24 08 mov rbx,qword ptr [rsp+8]
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; 000000000000001F: 49 89 01 mov qword ptr [r9],rax
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; 0000000000000022: 49 89 51 08 mov qword ptr [r9+8],rdx
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; 0000000000000026: 0F 94 C0 sete al
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; 0000000000000029: C3 ret
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_TEXT ENDS
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END
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