Cmp %Rd, Sign7 - Seiko Epson S1C17 Series Manual

7 DETAILS OF INSTRUCTIONS

cmp %rd, sign7

Function 16-bit comparison
Standard)
Extension 1) rd(15:0) - sign16
Extension 2) Unusable
15 14 13 12 11 10
Code
1 0 0
| |
IL IE C
Flag
| – ↔ ↔ ↔ ↔ |
–
Mode
Src:Immediate data (signed)
Dst:Register direct %rd = %r0 to %r7
CLK
One cycle
Description (1) Standard
cmp
Subtracts the signed 7-bit immediate sign7 from the contents of the rd register, and sets or resets
the flags (C, V, Z and N) according to the results. The sign7 is sign-extended into 16 bits prior
to the operation. The operation is performed in 16-bit size. It does not change the contents of
the rd register.
(2) Extension 1
ext
cmp
Subtracts the signed 16-bit immediate sign16 from the contents of the rd register, and sets or
resets the flags (C, V, Z and N) according to the results. The operation is performed in 16-bit
size. It does not change the contents of the rd register.
(3) 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 (1) cmp
(2) ext
cmp
7-20
rd(15:0) - sign7(sign extended)
9 8 7
| |
1 0 0 r d
| | | | |
V Z N
| | |
%rd,sign7 ; rd - sign7
imm13 ; imm13(8:0) = sign16(15:7)
%rd,sign7 ; rd - sign16, sign7 = sign16(6:0)
%r0,0x3f ; Changes the flags according to the results of
; r0 - 0x3f.
0x1ff
%r1,0x7f ; Changes the flags according to the results of
; r1 - 0xffff.
6 5 4 3 2 1 0
sign7
| | | | | |
EPSON
S1C17 FAMILY S1C17 CORE MANUAL