ARM Cortex-M3 User Manual download pdf (Page 8)

8

The Thumb

-

2 instruction set



Variable

-

length instructions



ARM instructions are a fixed length of 32 bits



Thumb instructions are a fixed length of 16

bits



Thumb

-

2 instructions can be either 16

-

bit or

32

-

bit



Thumb

-

2

gives approximately 26%

improvement in code density over ARM



Thumb

-

2

gives approximately 25%

improvement in performance over

Thumb

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