MIPS汇编语言（一）

MIPS汇编语言入门

MIPS(Millions of Instructions Per Second)

Classic flow:

• Fetch instruction
• Read registers
• Arithmetic operation
• Memory access
• Write back

Five steps and four cycles(Read and write registers cost only half a cycle).

Delay slot:

After the jump and branch condition, there is a delay slot to fill a non-related operation(usually a n operation before the branch).

How a program excutes

• genera 3-operand format

  op dest, src1, src2

MIPS instructions & memory organization

• type of instructions

  

  • Data operations
    • Arithmetic(add, substrct……)
    • Logical(and, or, not, xor……)
  • Data transfer
    • Load(Memory -> Register)
    • Store(Register -> Memory)
  • Sequencing
    • Branch(conditional, >, <, ==……)
    • Jump(unconditional, goto……)

• Registers

  • 32 General Purpose Registers
  • Very important!!
    • ALL the values for instructions must come from registers!
    • R0 is always zero!!

Data operations & transfers

Sequencing