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@@ -520,7 +520,7 @@ unit aoptx86;
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(p.opcode = A_FNSTSW)) and
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(p.oper[0]^.typ=top_reg) and
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Reg1WriteOverwritesReg2Entirely(p.oper[0]^.reg,reg)) or
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- (((p.opcode = A_XOR) or (p.opcode = A_SUB)) and
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+ (((p.opcode = A_XOR) or (p.opcode = A_SUB) or (p.opcode = A_SBB)) and
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(p.oper[0]^.typ=top_reg) and (p.oper[1]^.typ=top_reg) and
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(p.oper[0]^.reg=p.oper[1]^.reg) and
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Reg1WriteOverwritesReg2Entirely(p.oper[1]^.reg,reg));
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nickysn