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104 Altera Corporation
32-Bit Instruction Set
WRCTL
Write Control Register
Operation: CTLk ← RA
Assembler Syntax: WRCTL %rA
Example: Not preceded by PFX:
WRCTL %g7 ; writes %g7 to STATUS reg
NOP ; required
Preceded by PFX:
PFX 1
WRCTL %g7 ; writes %g7 to ISTATUS reg
Description: Not preceded by PFX:
Loads the STATUS register with RA. WRTCL to STATUS must be followed by a
NOP instruction.
Preceded by PFX:
Writes the value in RA to the machine-control register selected by K. See the
programmer’s model for a list of the machine-control registers and their indices.
Condition Codes: If the target of WRCTL is the STATUS register, then the condition-code flags are
directly set by the WRCTL operation from bits RA[3..0]. For any other WRCTL
target register, the condition codes are unaffected.
Instruction Format: Rw
Instruction Fields: A = Register index of operand RA
1514131211109876543210
011111 11000 A