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8.33.2.2 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