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x86 assembly has the standard mathematical operations, add , sub , mul , with idiv ; the logical operators and , or , xor , neg ; bitshift arithmetic and logical, sal / sar , shl / shr ; rotate with and without carry, rcl / rcr , rol / ror , a complement of BCD arithmetic instructions, aaa , aad , daa
Assembly Arithmetic Instructions - Learning assembly programming language in simple and easy steps using this beginner's tutorial containing basic to advanced The ADD and SUB instructions are used for performing simple addition/subtraction of binary data in byte, word and doubleword size, i.e., for adding or
Operation The ADD instruction adds the values in Rn and Operand2 or imm12. In certain circumstances, the assembler can substitute one instruction for another. Be aware of this when reading disassembly listings. Use of PC and SP in Thumb instructions Generally, you cannot use PC (R15) for Rd, or any operand.
Place the quotient in EAX and the remainder in EDX. These instructions perform the specified logical operation (logical bitwise and, or, and exclusive or, respectively) on their operands, placing the result in the first operand location. and eax, 0fH — clear all but the last 4 bits of EAX.
There are a few differences between these two pieces of code. For one, the instruction encoding and sizes. The first is encoded as follows 8b 40 04 mov eax, [eax+4] amounting two 3 bytes. For the second one 83 c0 04 add eax, 4 8b 00 mov eax, [eax] totals 5 bytes. Moreover, the add instruction sets
12 Oct 2013
Assembly language instructions for a hypothetical machine (not MIPS). Load x, r1. Load y, r2. Load z, r0. Add r3, r1, r2. Sub r0, r3, r0. Store r0, a. Each processor has a different set of registers, and different assembly language instructions. The assembly language instructions of Intel Pentium and MIPS are completely
The AND instruction. The legal operands for this instruction are the same as those for the ADD instruction. AND performs a bitwise AND on the source and destination operands and stores the result in the destination operand. It is useful to check the various bits in a particular byte/word.
Add with carry. Adds src + carry flag to dest , storing result in dest . Usually follows a normal add instruction to deal with values twice as large as the size of the register. In the following example, source contains a 64-bit number which will be added to destination. mov eax, [source]
For another example, addl %edx,%eax means Add the contents of the edx and eax registers, and place the sum in the eax register. Included in the syntactic differences between gas and Intel assemblers is that all register names used as operands must be preceeded by a percent (%) sign, and instruction names usually end
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