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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"><HTML><HEAD><TITLE>80386 Programmer's Reference Manual -- Opcode TEST</TITLE></HEAD><BODY><B>up:</B> <A HREF="c17.htm">Chapter 17 -- 80386 Instruction Set</A><BR><B>prev:</B><A HREF="SUB.htm"> SUB Integer Subtraction</A><BR><B>next:</B><A HREF="VERR.htm"> VERR Verify a Segment for Reading or Writing</A><P><HR><P><H1>TEST -- Logical Compare</H1><PRE>Opcode Instruction Clocks DescriptionA8 ib TEST AL,imm8 2 AND immediate byte with ALA9 iw TEST AX,imm16 2 AND immediate word with AXA9 id TEST EAX,imm32 2 AND immediate dword with EAXF6 /0 ib TEST r/m8,imm8 2/5 AND immediate byte with r/m byteF7 /0 iw TEST r/m16,imm16 2/5 AND immediate word with r/m wordF7 /0 id TEST r/m32,imm32 2/5 AND immediate dword with r/m dword84 /r TEST r/m8,r8 2/5 AND byte register with r/m byte85 /r TEST r/m16,r16 2/5 AND word register with r/m word85 /r TEST r/m32,r32 2/5 AND dword register with r/m dword</PRE><H2>Operation</H2><PRE>DEST := LeftSRC AND RightSRC;CF := 0;OF := 0;</PRE><H2>Description</H2>TEST computes the bit-wise logical AND of its two operands. Each bitof the result is 1 if both of the corresponding bits of the operands are 1;otherwise, each bit is 0. The result of the operation is discarded and onlythe flags are modified.<H2>Flags Affected</H2>OF := 0, CF := 0; SF, ZF, and PF as described in <A HREF="appc.htm">Appendix C</A><H2>Protected Mode Exceptions</H2>#GP(0) for an illegal memory operand effective address in the CS, DS,ES, FS, or GS segments; #SS(0) for an illegal address in the SS segment;#PF(fault-code) for a page fault<H2>Real Address Mode Exceptions</H2>Interrupt 13 if any part of the operand would lie outside of the effectiveaddress space from 0 to 0FFFFH<H2>Virtual 8086 Mode Exceptions</H2>Same exceptions as in Real Address Mode; #PF(fault-code) for a pagefault<P><HR><P><B>up:</B> <A HREF="c17.htm">Chapter 17 -- 80386 Instruction Set</A><BR><B>prev:</B><A HREF="SUB.htm"> SUB Integer Subtraction</A><BR><B>next:</B><A HREF="VERR.htm"> VERR Verify a Segment for Reading or Writing</A></BODY>⌨️ 快捷键说明
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