sbb.htm

来自「Programmer s Reference Manual is an impr」· HTM 代码 · 共 98 行

HTM
98 行
字号 
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"><HTML><HEAD><TITLE>80386 Programmer's Reference Manual -- Opcode SBB</TITLE></HEAD><BODY><B>up:</B> <A HREF="c17.htm">Chapter 17 -- 80386 Instruction Set</A><BR><B>prev:</B><A HREF="SAL.htm"> SAL/SAR/SHL/SHR Shift Instructions</A><BR><B>next:</B><A HREF="SCAS.htm"> SCAS/SCASB/SCASW/SCASD Compare String Data</A><P><HR><P><H1>SBB -- Integer Subtraction with Borrow</H1><PRE>Opcode       Instruction       Clocks  Description1C  ib       SBB AL,imm8       2       Subtract with borrow immediate byte                                       from AL1D  iw       SBB AX,imm16      2       Subtract with borrow immediate word                                       from AX1D  id       SBB EAX,imm32     2       Subtract with borrow immediate                                       dword from EAX80  /3 ib    SBB r/m8,imm8     2/7     Subtract with borrow immediate byte                                       from r/m byte81  /3 iw    SBB r/m16,imm16   2/7     Subtract with borrow immediate word                                       from r/m word81  /3 id    SBB r/m32,imm32   2/7     Subtract with borrow immediate                                       dword from r/m dword83  /3 ib    SBB r/m16,imm8    2/7     Subtract with borrow sign-extended                                       immediate byte from r/m word83  /3 ib    SBB r/m32,imm8    2/7     Subtract with borrow sign-extended                                       immediate byte from r/m dword18  /r       SBB r/m8,r8       2/6     Subtract with borrow byte register                                       from r/m byte19  /r       SBB r/m16,r16     2/6     Subtract with borrow word register                                       from r/m word19  /r       SBB r/m32,r32     2/6     Subtract with borrow dword register                                       from r/m dword1A  /r       SBB r8,r/m8       2/7     Subtract with borrow byte register                                       from r/m byte1B  /r       SBB r16,r/m16     2/7     Subtract with borrow word register                                       from r/m word1B  /r       SBB r32,r/m32     2/7     Subtract with borrow dword register                                       from r/m dword</PRE><H2>Operation</H2><PRE>IF SRC is a byte and DEST is a word or dwordTHEN DEST := DEST - (SignExtend(SRC) + CF)ELSE DEST := DEST - (SRC + CF);</PRE><H2>Description</H2>SBB adds the second operand (DEST) to the carry flag (CF) andsubtracts the result from the first operand (SRC). The result of thesubtraction is assigned to the first operand (DEST), and the flags areset accordingly.<P>When an immediate byte value is subtracted from a word operand, theimmediate value is first sign-extended.<H2>Flags Affected</H2>OF, SF, ZF, AF, PF, and CF as described in <A HREF="appc.htm">Appendix C</A><H2>Protected Mode Exceptions</H2>#GP(0) if the result is in a nonwritable segment; #GP(0) for an illegalmemory operand effective address in the CS, DS, ES, FS, or GSsegments; #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="SAL.htm"> SAL/SAR/SHL/SHR Shift Instructions</A><BR><B>next:</B><A HREF="SCAS.htm"> SCAS/SCASB/SCASW/SCASD Compare String Data</A></BODY>

sbb.htm - 源码说明

本页面展示了「Programmer s Reference Manual is an improtant book on Intel processor architecture and programming.」中的 sbb.htm 源码文件，采用 HTM 编程语言编写，共 98 行代码。您可以在线阅读完整代码内容，也可以返回资源详情页下载完整源码包进行本地学习和开发。

虫虫下载站收录了大量与architecture相关的技术资源，包括源代码、技术文档、电路图等，是电子工程师和嵌入式开发者的专业学习平台。

⌨️ 快捷键说明

复制代码Ctrl + C
搜索代码Ctrl + F
全屏模式F11
增大字号Ctrl + =
减小字号Ctrl + -
显示快捷键?