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Irvine, Kip R. Assembly Language for Intel-Based Computers, 2003. 1. Multiplication and Division Instructions. • MUL Instruction. • IMUL Instruction. • DIV Instruction. • Signed Integer Division. • Implementing Arithmetic Expressions
x86 assembly language is a family of backward-compatible assembly languages, which provide some level of compatibility all the way back to the Intel 8008 introduced in April 1972. x86 assembly languages are used to produce object code for the x86 class of processors. Like all assembly languages, it uses short
This section should not be considered an exhaustive list of x86 instructions, but rather a useful subset. For a complete list, see . The imul instruction has two basic formats: two-operand (first two syntax listings above) and three-operand (last two syntax listings above). The two-operand form
17 Oct 2008 Top 20 instructions of x86 architecture: mov constitutes 35% of all instructions, push. The most popular instruction is MOV (35% of But what about other instructions? It turns out that multiplication and division are very rare: IMUL takes 0.13%, IDIV takes 0.04%, and both MUL and DIV do 0.02%. Even string
and rotate instructions). For example: AL, DL. DX, AX m1 DB ? AL, m1 m2 DW ? AX, m2. 0 Some instructions allow several operand combinations. For example: memory, immediate. AAA. AAD. AAM. AAS. ADC. ADD. AND. CALL. CBW. CLC. CLD. CLI. CMC. CMP. CMPSB. CMPSW. CWD. DAA. DAS. DEC. DIV. HLT. IDIV.
29 Sep 2010 When imul is passed a 32 bit argument as in your case with EDX which effectively means EAX * EDX where both EAX and EDX are 32 bit registers. Since you are multiplying two 32 bit values it is possible that the answer will overflow 32 bits in which case the high 32 bits of the answer will be written to the
30 Oct 2012 We saw in the first article an introduction to the most common x86 assembly instructions seen when it comes to disassembling and analyzing programs. We talked about MUL instruction. Very useful, the CPU uses either the instruction MUL (for unsigned multiplication) or IMUL (for signed multiplication).
16 Jul 2013 Baby steps in x86 assembly I'm assuming you already know basic assembler instructions, you're aware of registers and have a clue about the stack. the address of the # instruction following # our emulated `call` jmp simplest_function # Jump to the called function _next_instruction: # And we're back! ret.

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February 2018