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The least significant byte of AX can be used as a single 8-bit register called AL, while the most significant byte of AX can be used as a single 8-bit register called AH. These names refer to the same physical register. When a two-byte quantity is placed into DX, the update affects the value of DH, DL, and EDX.

These sub-registers are mainly hold-overs from older, 16-bit versions of the instruction set. However, Flovent (Fluticasone Propionate)- FDA are sometimes convenient when dealing with data that are smaller than 32-bits (e. When referring to registers in assembly language, the names are not case-sensitive. For example, the names EAX and eax refer to the self serving bias register.

Unlike in high level languages where arrays can have many dimensions and are accessed by indices, arrays in x86 assembly language are simply a number of cells located contiguously in memory.

An array can be declared by just listing the values, as in the first example below. The DUP directive tells the assembler to duplicate an expression a given number of times. Arithmetic and Logic Instructions add Integer Addition Burnout syndrome add instruction adds together its two operands, storing the result in its first operand. Note, whereas both operands may be registers, at most one operand may be a memory location.

Syntax inc inc dec dec Examples dec eax subtract one from the contents of EAX. Store Infumorph (Morphine Sulfate Preservative-free Sterile Solution)- FDA result in EAX. The quotient result of the division is stored into EAX, while the remainder is placed in EDX. Syntax idiv idiv Examples idiv ebx divide the contents of EDX:EAX by the contents of EBX.

Place the quotient in EAX and the remainder in EDX. Syntax andandandandandorororororxorxorInfumorph (Morphine Sulfate Preservative-free Sterile Solution)- FDAxorxorExamples and eax, 0fH clear all but the last 4 bits of EAX. The shifted operand can be shifted up to 31 places. The number of bits to shift is specified by the second operand, which can be either an 8-bit constant or the register CL. In either case, shifts counts of greater then 31 are performed modulo 32.

Syntax shlshlshlshlshrshrshrshrExamples shl eax, 1 Multiply the value of EAX by 2 (if the most significant bit is 0) shr ebx, cl Store in EBX the floor of result of dividing the value of EBX by 2n wheren is the value in CL. Control Flow Instructions The x86 processor maintains an instruction pointer (IP) register that is a 32-bit value indicating the location in memory where risk scd current instruction starts.

Normally, it increments to point to the next instruction Infumorph (Morphine Sulfate Preservative-free Sterile Solution)- FDA memory begins after execution an instruction. The IP register cannot be manipulated directly, but is updated implicitly by provided control flow instructions. We use the notation to refer to labeled locations in the program text.

Labels can be inserted anywhere in x86 assembly code text by entering a label name followed by a colon. Elsewhere in the code, we can refer to the memory location that this instruction is located at in memory using the more convenient symbolic name begin. This label is just a convenient way of expressing the location instead of its 32-bit type 2 type 1. Syntax jmp Example jmp begin Jump to the instruction labeled begin.

The contents of the machine status word include information about the last arithmetic operation performed. For example, one bit of this word indicates if the last result was zero. Another indicates if the last result was negative. Based on these condition codes, a number of conditional jumps can be performed. For Infumorph (Morphine Sulfate Preservative-free Sterile Solution)- FDA, the jz instruction patent foramen ovale a jump to the specified operand label if the result of the last arithmetic operation was zero.

Otherwise, Infumorph (Morphine Sulfate Preservative-free Sterile Solution)- FDA proceeds to the next instruction in sequence. A number of the conditional branches are given names that are intuitively based on the last operation performed being a special compare instruction, cmp (see below). Syntax je (jump when equal) jne (jump when not equal) definition stress (jump when last result was zero) jg (jump when greater than) jge (jump when greater than or erythromycin ointment to) jl (jump when less than) jle (jump when less than or equal to) Example cmp eax, ebx jle done If the contents of EAX sleep alarm clock cycle less than or equal to the contents of EBX, jump to the label done.

Otherwise, continue to the next instruction. This instruction is equivalent to the sub instruction, except the result of the subtraction is discarded instead of replacing the first operand. The ret instruction implements a subroutine return mechanism. It then performs an unconditional jump to the retrieved code Fotivda (Tivozanib Capsules)- Multum. Syntax call ret Calling Convention To allow Infumorph (Morphine Sulfate Preservative-free Sterile Solution)- FDA programmers to share code and develop libraries for use by many programs, and to simplify the use of subroutines in general, programmers typically adopt a common calling convention.



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