Messages in this thread |  | | | Date | Wed, 25 Feb 2004 18:44:57 -0500 | | From | Timothy Miller <> | | Subject | Re: Intel vs AMD x86-64 |
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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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