Right now LOOPNZ, LOOPNE, LOOPZ, LOOPE, LOOP encoded with opcodes E0-E2 use operand type bs for its operand of addressing J which is defined as:
Byte, sign-extended to the size of the destination operand.
The problem is that the immediate is always sign extended to the size of the stack pointer, the address size prefix can only determine what register is used as the counter (eCX or rCX) and not the size of the immediate which is the relative address to jump to which is to be extended to the size of the stack pointer. Therefore the most appropriate operand type for these should be bss:
Byte, sign-extended to the size of the stack pointer (for example, PUSH (6A)).
mazegen
commented
1 year ago
Right now
LOOPNZ,LOOPNE,LOOPZ,LOOPE,LOOPencoded with opcodesE0-E2use operand typebsfor its operand of addressingJwhich is defined as:The problem is that the immediate is always sign extended to the size of the stack pointer, the address size prefix can only determine what register is used as the counter (
eCXorrCX) and not the size of the immediate which is the relative address to jump to which is to be extended to the size of the stack pointer. Therefore the most appropriate operand type for these should bebss: