The University of Adelaide, School of Computer Science

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The University of Adelaide, School of Computer Science 6 December 2018 CSF 2009 MIPS Assembly Language: Logical Operations Chapter 2 Chapter 2 — Instructions: Language of the Computer

The University of Adelaide, School of Computer Science 6 December 2018 Logical Operations Instructions for bitwise manipulation Operation C Java MIPS Shift left << sll Shift right >> >>> srl Bitwise AND & and, andi Bitwise OR | or, ori Bitwise NOT ~ nor Useful for extracting and inserting groups of bits in a word Chapter 2 — Instructions: Language of the Computer — 2 Chapter 2 — Instructions: Language of the Computer

The University of Adelaide, School of Computer Science 6 December 2018 AND Operations Useful to mask bits in a word Select some bits, clear others to 0 and $t0, $t1, $t2 $t2 0000 0000 0000 0000 0000 1101 1100 0000 $t1 0000 0000 0000 0000 0011 1100 0000 0000 $t0 0000 0000 0000 0000 0000 1100 0000 0000 Chapter 2 — Instructions: Language of the Computer — 3 Chapter 2 — Instructions: Language of the Computer

The University of Adelaide, School of Computer Science 6 December 2018 OR Operations Useful to include bits in a word Set some bits to 1, leave others unchanged or $t0, $t1, $t2 $t2 0000 0000 0000 0000 0000 1101 1100 0000 $t1 0000 0000 0000 0000 0011 1100 0000 0000 $t0 0000 0000 0000 0000 0011 1101 1100 0000 Chapter 2 — Instructions: Language of the Computer — 4 Chapter 2 — Instructions: Language of the Computer

The University of Adelaide, School of Computer Science 6 December 2018 NOT Operations Useful to invert bits in a word Change 0 to 1, and 1 to 0 MIPS has NOR 3-operand instruction a NOR b == NOT ( a OR b ) nor $t0, $t1, $zero Register 0: always read as zero $t1 0000 0000 0000 0000 0011 1100 0000 0000 $t0 1111 1111 1111 1111 1100 0011 1111 1111 Chapter 2 — Instructions: Language of the Computer — 5 Chapter 2 — Instructions: Language of the Computer

The University of Adelaide, School of Computer Science 6 December 2018 Shift Operations op rs rt rd shamt funct 6 bits 5 bits shamt: how many positions to shift Shift left logical Shift left and fill with 0 bits sll by i bits multiplies by 2i Shift right logical Shift right and fill with 0 bits srl by i bits divides by 2i (unsigned only) Chapter 2 — Instructions: Language of the Computer — 6 Chapter 2 — Instructions: Language of the Computer

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