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#### 9.49.2.2 Register Names

`as` supports the following names for registers:

`general register 0`

  r0, zero

`general register 1`

  r1

`general register 2`

  r2, hp

`general register 3`

  r3, sp

`general register 4`

  r4, gp

`general register 5`

  r5, tp

`general register 6`

  r6

`general register 7`

  r7

`general register 8`

  r8

`general register 9`

  r9

`general register 10`

  r10

`general register 11`

  r11

`general register 12`

  r12

`general register 13`

  r13

`general register 14`

  r14

`general register 15`

  r15

`general register 16`

  r16

`general register 17`

  r17

`general register 18`

  r18

`general register 19`

  r19

`general register 20`

  r20

`general register 21`

  r21

`general register 22`

  r22

`general register 23`

  r23

`general register 24`

  r24

`general register 25`

  r25

`general register 26`

  r26

`general register 27`

  r27

`general register 28`

  r28

`general register 29`

  r29

`general register 30`

  r30, ep

`general register 31`

  r31, lp

`system register 0`

  eipc

`system register 1`

  eipsw

`system register 2`

  fepc

`system register 3`

  fepsw

`system register 4`

  ecr

`system register 5`

  psw

`system register 16`

  ctpc

`system register 17`

  ctpsw

`system register 18`

  dbpc

`system register 19`

  dbpsw

`system register 20`

  ctbp

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