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What is pseudo instructions?
A pseudo-instruction doesn't actually exist in the instruction set of a processor. A pseudo-instruction will be a convenient single name for one or more actual instructions. A common example is the unconditional jump instruction. Normally the syntax for this instruction would be: jmp address ...but the assembler might actually translate that into: cmp t0 r0 r0 jmp t0 address Which is basically checking to see if the zero register is equal to the zero register, and if so jump. Since this will always be true, it will always jump.
How do you move the carry flag to the register memory?
To move the carry flag to a register in assembly language, you typically use the ADC (Add with Carry) or SBB (Subtract with Borrow) instruction, depending on the operation context. Alternatively, you can use the CLO (Clear Carry) and STC (Set Carry) instructions to manipulate the carry flag directly. In some architectures, you may also use a specific instruction that directly transfers the carry flag to a designated register, if available. Always refer to the specific instruction set architecture documentation for precise syntax and capabilities.
What are necessary properties of RISC CPUs?
a "reduced" instruction set, consisting only of the instructions most commonly generated by compilersall arithmetic and logic instructions operate only register to register using an internal register setonly basic arithmetic and logic operations are built in, others handled in softwareall memory access instructions are simple register load or store instructionsonly one memory access mode built in, others handled in softwareinstructions always aligned whole words (no short or unaligned instructions)significant degree of pipeline parallelism in the hardware to optimize hardware efficiencyetc.
How does push work on registers and variables?
The PUSH instruction decrements the stack pointer by the size of the operand and then stores its operand at the memory address pointed to by the stack pointer. This leaves the stack pointer always pointing to the last element pushed onto the stack.The POP instruction reverses the sequence, retrieving the operand first, and then incrementing the stack pointer by the size of the operand.Also, PUSH and POP do not work on variables - they only work on register values. You can pop/push a variable, however, by using a register and then storing/retrieving the register to/from memory.
True or false A frame of reference is not necessary to describe motion accurately and completely?
False. A frame of reference is necessary to describe motion accurately and completely because it provides a point of view from which to measure and analyze the motion of an object. Without a frame of reference, it is not possible to determine the position, velocity, or acceleration of an object.
Role of instruction pointer in 8086?
Its role is to point to the next instruction to be executed in the CPU. It always points to the next instruction to be executed in the CPU
What paperwork is required for buying a car from a junkyard in Pennsylvania?
what you'll get is a salvage title, you can repair the car and register it but an inspection will be necessary and the title will most likely always show it was salvaged.
The first instruction in the ROM BIOS startup program is always assigned to?
Memory address FFFF0h is the memory address always assigned to the first instruction in the ROM BIOS
Explain different parts of an instruction format?
Instruction FormatThe information encoded in an 80386 instruction includes a specification of the operation to be performed, the type of the operands to be manipulated, and the location of these operands. If an operand is located in memory, the instruction must also select, explicitly or implicitly, which of the currently addressable segments contains the operand.80386 instructions are composed of various elements and have various formats. The exact format of instructions is shown in Appendix B; the elements of instructions are described below. Of these instruction elements, only one, the opcode, is always present. The other elements may or may not be present, depending on the particular operation involved and on the location and type of the operands. The elements of an instruction, in order of occurrence are as follows:Prefixes -- one or more bytes preceding an instruction that modify the operation of the instruction. The following types of prefixes can be used by applications programs: Segment override -- explicitly specifies which segment register an instruction should use, thereby overriding the default segment-register selection used by the 80386 for that instruction.Address size -- switches between 32-bit and 16-bit address generation.Operand size -- switches between 32-bit and 16-bit operands.Repeat -- used with a string instruction to cause the instruction to act on each element of the string.Opcode -- specifies the operation performed by the instruction. Some operations have several different opcodes, each specifying a different variant of the operation.Register specifier -- an instruction may specify one or two register operands. Register specifiers may occur either in the same byte as the opcode or in the same byte as the addressing-mode specifier.Addressing-mode specifier -- when present, specifies whether an operand is a register or memory location; if in memory, specifies whether a displacement, a base register, an index register, and scaling are to be used.SIB (scale, index, base) byte -- when the addressing-mode specifier indicates that an index register will be used to compute the address of an operand, an SIB byte is included in the instruction to encode the base register, the index register, and a scaling factor.Displacement -- when the addressing-mode specifier indicates that a displacement will be used to compute the address of an operand, the displacement is encoded in the instruction. A displacement is a signed integer of 32, 16, or eight bits. The eight-bit form is used in the common case when the displacement is sufficiently small. The processor extends an eight-bit displacement to 16 or 32 bits, taking into account the sign.Immediate operand -- when present, directly provides the value of an operand of the instruction. Immediate operands may be 8, 16, or 32 bits wide. In cases where an eight-bit immediate operand is combined in some way with a 16- or 32-bit operand, the processor automatically extends the size of the eight-bit operand, taking into account the sign.
Is it cross reference with or cross reference to?
it is always cross refer to ......
Can usher register me for RandB and were can i meet you please say yes i always wanted to be a musician register me please were ever you are i will come so you can register me?
yes
How do you walk on sims 3?
You can always check your instruction manual.
