http://www.eax.com

The Supreme Headquarters of the 32 bit registers



EAX -- the first 32-bit register on IA-32 (Intel Arechitecture, 32-bit). The 16 bit registers on Intel CPUs tend to be called like AX, BX, CX, etc. Their 8-bits parts tends to be called AL and AH, for AX, for BX we have BL and BH and so on for other 16-bit registers. When the cpu runs in extended mode it uses 32 bit registers, their names are created by prepending prefix "E" ( as in *E*xtended mode) to register name. Thus we have EAX, EBX, ECX, etc. On iAMD64 the registers are named by prefixing R for Register. Thus we have RAX, RBX, RCX and so on for 64 bit registers.



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