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4358 Serge 1 
Register Usage
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rax      temporary register; with variable arguments passes information
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         about the number of SSE registers used; 1st return register
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rbx*     callee-saved register; optionally used as base pointer
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rcx      used to pass 4th integer argument to functions
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rdx      used to pass 3rd argument to functions 2nd return register
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rsp*     stack pointer
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rbp*     callee-saved register; optionally used as frame pointer
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rsi      used to pass 2nd argument to functions
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rdi      used to pass 1st argument to functions
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r8       used to pass 5th argument to functions
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r9       used to pass 6th argument to functions
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r10      temporary register, used for passing a function's static chain pointer
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r11      temporary register
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r12-15*  callee-saved registers
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xmm0­1   used to pass and return floating point arguments
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xmm2­7   used to pass floating point arguments
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xmm8­15  temporary registers
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mmx0­7   temporary registers
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st0      temporary register; used to return long double arguments
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st1      temporary registers; used to return long double arguments
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st2­7    temporary registers
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fs       Reserved for system use (as thread specific data register)
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*) must be preserved across function calls
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Integer arguments from list: rdi,rsi,rdx,rcx,r8,r9,stack
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Floating point arguments from list: xmm0-xmm7