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Olivier Deheurles odeheurles

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odeheurles / Reading from flyweight in C++
Created December 14, 2013 11:37
sbe_uint32_t serialNumber(void) const
{
return SBE_LITTLE_ENDIAN_ENCODE_32(*((sbe_uint32_t *)(buffer_ + offset_ + 0)));
}
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odeheurles / gist:7957984
Last active December 31, 2015 07:59
order.orderId(72);
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odeheurles / Assembly optimized
Last active December 31, 2015 07:59
80: car.SerialNumber = 1234;
mov edx,dword ptr [esi+8]
mov ecx,dword ptr [esi+18h]
mov eax,dword ptr [edx+8]
mov dword ptr [eax+ecx],4D2h
81: car.ModelYear = 2013;
mov edx,dword ptr [esi+8]
mov ecx,dword ptr [esi+18h]
add ecx,4
mov eax,dword ptr [edx+8]
@odeheurles
odeheurles / Assembly not optimized
Created December 14, 2013 10:58
80: car.SerialNumber = 1234;
mov rax,qword ptr [rbp+100h]
cmp byte ptr [rax],0
mov rcx,qword ptr [rbp+100h]
mov edx,4D2h
call 000007FE8C96CB40 // function call
nop
81: car.ModelYear = 2013;
mov rax,qword ptr [rbp+100h]
cmp byte ptr [rax],0
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odeheurles / Original code
Created December 14, 2013 10:56
private static int Encode(Car car, DirectBuffer directBuffer, int bufferOffset)
{
...
car.SerialNumber = 1234;
car.ModelYear = 2013;
car.Available = BooleanType.TRUE;
car.Code = Model.A;
...
}
@odeheurles
odeheurles / Assembly optimized
Created December 14, 2013 10:49
Example of inlining with Simple Binary Encoding
80: car.SerialNumber = 1234;
mov edx,dword ptr [esi+8]
mov ecx,dword ptr [esi+18h]
mov eax,dword ptr [edx+8]
mov dword ptr [eax+ecx],4D2h
81: car.ModelYear = 2013;
mov edx,dword ptr [esi+8]
mov ecx,dword ptr [esi+18h]
add ecx,4
mov eax,dword ptr [edx+8]