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7 DETAILS OF INSTRUCTIONS
cmc %rd, sign7
Function
16-bit comparison with carry
Standard)
Extension 1) rd(15:0) - sign16 - C
Extension 2) Unusable
15 14 13 12 11 10
Code
1
0
0
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IL
IE
C
Flag
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– ↔ ↔ ↔ ↔
–
Mode
Src: Immediate data (signed)
Dst: Register direct %rd = %r0 to %r7
CLK
One cycle
Description
(1) Standard
cmc
Subtracts the contents of the signed 7-bit immediate sign7 and C (carry) flag 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
cmc
Subtracts the contents of the signed 16-bit immediate sign16 and C (carry) flag 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) cmc
(2) ext
cmc
7-20
rd(15:0) - sign7(sign extended) - C
9
8
7
6
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1
0
1
r d
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V
Z
N
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%rd,sign7
; rd - sign7 - C
imm9
; imm9(8:0) = sign16(15:7)
%rd,sign7
; rd - sign16 - C, sign7 = sign16(6:0)
%r0,0x7f ; Changes the flags according to the results of
; r0 - 0x7f - C.
0x1ff
%r1,0x7f ; Changes the flags according to the results of
; r1 - 0xffff - C.
Seiko Epson Corporation
5
4
3
2
1
0
sign7
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|
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S1C17 CORE MANUAL
(REV. 1.2)
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