Specifications

rdctl
Instruction read from control register
Operation
rC ← ctlN
Assembler Syntax
rdctl rC, ctlN
Example
rdctl r3, ctl31
Description
Reads the value contained in control register ctlN and writes it
to register rC.
Exceptions
Supervisor-only instruction
Instruction Type
R
Instruction Fields
C = Register index of operand rC
N = Control register index of operand ctlN
Bit Fields
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
0 0 C 0x26
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0x26 N 0x3a
rdprs
Instruction
read from previous register set
Operation
rB ← prs.rA + σ(IMM16)
Assembler Syntax
rdprs rB, rA, IMM16
Example
rdprs r6, r7, 0
Description
Sign-extends the 16-bit immediate value IMM16 to 32 bits, and
adds it to the value of rA from the previous register set. Places
the result in rB in the current register set.
8-66
rdctl
NII51017
2015.04.02
Altera Corporation
Instruction Set Reference
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