Re: Intel vs AMD x86-64

[Timothy Miller]

Nakajima, Jun wrote:
> For near branches (CALL, RET, JCC, JCXZ, JMP, etc.), the operand size is
> forced to 64 bits on both processors in 64-bit mode, basically meaning
> RIP is updated.
>
> Compilers would typically use a JMP short for "intraprocedural jumps",
> which requires just an 8-bit displacement relative to RIP. 


I see.  It's too bad you can't have a 16-bit displacement.


Ummm... so if 66H were used with a near branch, would that affect the 
size of the immediate operand which gets added to RIP, or would that 
affect the the portion of IP/EIP/RIP affected?  If it's the latter, 
that's pretty silly.


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