Chapter 12 Instruction list Manual VIPA CPU 21x
Command
Operand
Parameter
Status word
Function
Length
in
BR CC1 CC0 OV OS OR STA RLO /FC
words
: Instruction depends on
: Instruction influences
12-18 HB103E - Rev. 05/45
Shift instructions
Shift instructions
Status word Shifting the contents of ACCU1 and ACCU1-L
to the left or right by the specified number o
places. If no address identifier is specified, shift
the number of places into ACCU2-LL. An
positions that become free are padded with
zeros or the sign.
The last shifted bit is in condition code bit CC1.
SLW -
BR CC1 CC0 OV OS OR STA RLO /FC
Shift the contents of ACCU1-L to the left. 1
SLW 0 ... 15
- - - - -----Positions that become free are provided with zeros
SLD -
- Y Y Y -----Shift the contents of ACCU1 to the left. 1
SLD 0 ... 32
Positions that become free are provided with zeros.
SRW -
Shift the contents of ACCU1-L to the right. 1
SRW 0 ... 15
Positions that become free are provided with zeros.
SRD -
Shift the contents of ACCU1 to the right. 1
SRD 0 ... 32
Positions that become free are provided with zeros.
SSI -
Shift the contents of ACCU1-L to the right with sign. 1
SSI 0 ... 15
Positions that become free are provided with the sign
(Bit 15) .
SSD -
Shift the contents of ACCU1 to the right with sign 1
SSD 0 ... 32
Rotation instructions
Status word Rotate the contents of ACCU1 to the left o
right by the specified number of places. If no
address identifier is specified, rotate the
number of places into ACCU2-LL.
RLD -
BR CC1 CC0 OV OS OR STA RLO /FC
Rotate the contents of ACCU1 to the left. 1
RLD 0 ... 32
- - - - -----
RRD -
- Y Y Y -----Rotate the contents of ACCU1 to the right. 1
RRD 0 ... 32
RLDA -
BR CC1 CC0 OV OS OR STA RLO /FC
Rotate the contents of ACCU1 one bit position to the left,
- - - - -----via CC1 bit.
RRDA -
- Y 0 0 -----Rotate the contents of ACCU1 one bit position to the right,
via CC1 bit.
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