Intel iAPX 86/88 User Manual page 53

8086/8088
CPU
Table 1-16 Instruction Set Reference Data (continued)
REPNE/REPNZ
REPNEIREPNZ (no operands)
Flags
~
0 I
TSZAPC
Repeat string operation while UUXUX
not equal/not zero
Operands
I
Clocks
I
Transfers·
I
Bytes
Coding Example
(no operands)
I
2(2)
I
-
I
1 REPNE SCAS INPUT_LINE
RET
I
RET optional-pop-value
Return from procedure
Flags 0 0 ITS ZAP C
Operands
Clocks Transfers· Bytes Coding Example
(intra-segment, no pop) 16(16) 1 1 RET
(intra-segment, pop)
20(18) 1 3 RET4
(inter-segment, no pop) 26(22) 2 1 RET
(inter-segment, pop) 25(25) 2
3
RET2
ROL
I
ROL destination, count
Flags
OOITSZAPC
Rotate left X X
Operands Clocks 'n'ansfers· Bytes Coding Example
register, 1
2(2)
-
2
ROL BX, 1
register, CL
8+41
-
2 ROLOI,CL
bit(5 + 1lbit)
memory, 1 15(15)+EA 2 2-4 ROL FLAG_BYTE [01),1
memoryCL 20+41 2 2-4 ROL ALPHA, CL
bit(17 +
1/bit)+EA
register, n
(5+ 1/bit)
-
3 ROLBX,5
memory, n
(17 + 1/bit) 2
3-5 ROLBETA,5
ROR
J
ROR destination, count
Rotate right
FIOOITSZAPC
ags X
X
Operands Clocks
'n'ansfers •
Bytes Coding Example
register, 1 2(2)
-
2 ROR BX, 1
register, CL 8+41
-
2 ROR BX, CL
bit(5 + 1/bit)
memory, 1 15(15)+EA 2 2-4 ROR PORT_STATUS, 1
memoryCL 20+41 2 2-4 ROR CMO_WORO, CL
bit(17+
1/bit)+EA
register, n
(5+ 1/bit)
-
3
ROR BX, 5
memory, n
(17 + 1lbit) 2
3-5
ROR BETA, 5
SAHF
I
SAHF (no operands)
Store AH into flags
FI 00 I TS ZAP C
ags RRRRR
Operands
Clocks
'n'ansfers •
Bytes Coding Example
(no operands) 4(3)
-
1 SAHF
• For the 8088 (80186) add four clocks for each 1 6-blt word transfer with an odd address. For the 8086 (80188) add four clocks for each 16-bit word
transfer.
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