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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
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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
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
S1C17 CORE MANUAL
(Rev. 1.2)
rd(15:0) - sign7(sign extended)
9
8
7
6
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1
0
0
r d
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V
Z
N
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%rd,sign7
; rd - sign7
imm9
; imm9(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.
Seiko Epson Corporation
5
4
3
2
1
0
sign7
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7 DETAILS OF INSTRUCTIONS
7-23
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