16 bit registers in x86 instruction

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x86 assembly instructions

x86 assembly registers

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eax register

rax register

Instruction Pointer (IP) ? The 16-bit IP register stores the offset address of the next instruction to be executed. IP in association with the CS register (as CS:IP)
16 Jan 2012 Intel assembly has 8 general purpose 32-bit registers: eax, ebx, ecx, edx, esi, edi 4 16-bit and 8-bit Registers; 5 64-bit Registers; 6 Questions This section will look at the 8 general purpose registers on the x86 architecture.16-bit[edit] The registers found on the 8086 and all subsequent x86 processors are the following: AX, BX, CX, DX, SP, BP, SI, DI, CS, SS, ES, DS, IP and FLAGS. These are all 16 bits wide.
Main page: X86 Assembly/16, 32, and R8–R15 are the new 64-bit registers.

27 Feb 2018 Without this behaviour, every single 32bit instruction in 64bit mode would have to The dependency madness is one of the reasons that 16bit instructions are
The x86 opcode bytes are 8-bit equivalents of iii field that we discussed in simplified The AX, DX, CX, BX, BP, DI, and SI registers are 16-bit equivalents of the
8C /r, MOV r/m16,Sreg**, Move segment register to r/m16. In 32-bit mode, the assembler may insert the 16-bit operand-size prefix with this instruction.
Modern (i.e 386 and beyond) x86 processors have eight 32-bit general 2 bytes of EAX can be treated as a 16-bit register called AX.
instructions on SSE registers, processing twice the store the high 16 bits of the results.
The FLAGS register is the status register in Intel x86 microprocessors that contains the current state of the processor. This register is 16 bits wide. Its successors, the EFLAGS and RFLAGS registers, are 32 bits and 64 bits codes, flag bits that let the results of one machine-language instruction affect another instruction.

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