x86 architecture
Post on 03-Jan-2016
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X86 Architecture
Intel’s Dilemma• All (most) software uses CISC code and needs a CISC ISA
• RISC is more efficient, CISC is cumbersome
PentiumCISC Input machine code
Translation CISC to RISC
Execution as RISC
PentiumArchitecture
CISC
RISC
Pentium Pipeline
// Test1.cpp : Defines the entry point for the console application.//#include "stdafx.h"int _tmain(int argc, _TCHAR* argv[]){
int x,y,z;x = 3;
0041137E mov dword ptr [x],3 puts 3 into memory at address x
y = 5;00411385 mov dword ptr [y],5 puts 5 into memory at address y
z = x + y;0041138C mov eax,dword ptr [x] moves data at address x into eax0041138F add eax,dword ptr [y] adds data at address y to eax00411392 mov dword ptr [z],eax moves contents of eax to memory at y
return 0;00411395 xor eax,eax }
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