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4–156 Alpha Architecture Handbook
4.13.4 Unpack Bytes
Format:
Operation:
temp = 0
CASE
UNPKBL:
BEGIN
temp<07:00> = Rbv<07:00>
temp<39:32> = Rbv<15:08>
END
UNPKBW:
BEGIN
temp<07:00> = Rbv<07:00>
temp<23:16> = Rbv<15:08>
temp<39:32> = Rbv<23:16>
temp<55:48> = Rbv<31:24>
END
ENDCASE
Rc ← temp
Exceptions:
Instruction mnemonics:
Qualifiers:
Description:
For UNPKBL, the lower two component bytes of Rb are zero-extended to longwords. The
resulting longwords are written to Rc.
For UNPKBW, the lower four component bytes of Rb are zero-extended to words. The result-
ing words are written to Rc.
UNPKBx Rb.rq,Rc.wq
! Operate Format
None
UNPKBL Unpack Bytes to Longwords
UNPKBW Unpack Bytes to Words
None