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7 DETAILS OF INSTRUCTIONS
S1C17 FAMILY S1C17 CORE MANUAL
EPSON
7-97
not
%rd, %rs
not/c %rd, %rs
not/nc %rd, %rs
Function
16-bit logical negation
Standard)
rd
(15:0)
← !rs(15:0), rd(23:16) ← 0
Extension 1) rd(15:0)
← !imm13(zero extended), rd(23:16) ← 0
Extension 2) rd(15:0)
← !imm16, rd(23:16) ← 0
Code
15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
0 0 1 0 1 1
r d
1 0 1 1
r s
not
|
0 0 1 0 1 1
r d
0 0 1 1
r s
not/c
|
0 0 1 0 1 1
r d
0 1 1 1
r s
not/nc
|
Flag
IL IE
C
V
Z
N
– – – 0
|
Mode
Src:Register direct %rs = %r0 to %r7
Dst:Register direct %rd = %r0 to %r7
CLK
One cycle
Description (1) Standard
not
%rd,%rs
; rd
← !rs
The low-order 16 bits of the rs register are reversed, and the result is loaded into the rd register.
The operation is performed in 16-bit size, and bits 23–16 of the rd register are set to 0.
(2) Extension 1
ext
imm13
not
%rd,%rs
; rd
← !imm13
All the bits of the zero-extended 13-bit immediate imm13 are reversed after zero-extended into
16 bits, and the result is loaded into the rd register. The operation is performed in 16-bit size,
and bits 23–16 of the rd register are set to 0.
(3) Extension 2
ext
imm13
; imm13(2:0) = imm16(15:13)
ext
imm13
; = imm16(12:0)
not
%rd,%rs
; rd
← !imm16
All the bits of the 16-bit immediate imm16 are reversed, and the result is loaded into the rd
register. The operation is performed in 16-bit size, and bits 23–16 of the rd register are set to 0.
(4) Conditional execution
The /c or /nc suffix on the opcode specifies conditional execution.
not/c
Executed as not when the C flag is 1 or executed as nop when the flag is 0
not/nc Executed as not when the C flag is 0 or executed as nop when the flag is 1
In this case, the ext instruction can be used to extend the operand.
(5) Delayed slot instruction
This instruction may be executed as a delayed slot instruction by writing it directly after
a branch instruction with the “d” bit. In this case, extension of the immediate by the ext
instruction cannot be performed.
Example
When r1 = 0x555555
not
%r0,%r1
; r0 = 0xaaaaaa