
7 DETAILS OF INSTRUCTIONS
162
EPSON
S1C33 FAMILY C33 PE CORE MANUAL
sub %rd, %rs
Function
Subtraction
Standard) rd
← rd - rs
Extension 1) rd
← rs - imm13
Extension 2) rd
← rs - imm26
Code
15 12 11 8 7 4 3 0
0 0 1 0 0 1 1 0
r s r d
0x26__
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Flag
IE C V Z N
–
↔ ↔ ↔ ↔
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Mode
Src: Register direct %rs = %r0 to %r15
Dst: Register direct
%rd = %r0 to %r15
CLK
One cycle
Description
(1) Standard
sub
%rd,%rs ; rd ← rd - rs
The content of the rs register is subtracted from the rd register.
(2) Extension 1
ext
imm13
sub
%rd,%rs ; rd ← rs - imm13
The 13-bit immediate
imm13 is subtracted from the content of the rs register after being zero-
extended, and the result is loaded into the rd register. The content of the rs register is not
altered.
(3) Extension 2
ext
imm13 ; = imm26(25:13)
ext
imm13 ; = imm26(12:0)
sub
%rd,%rs ; rd ← rs - imm26
The 26-bit immediate
imm26 is subtracted from the content of the rs register after being zero-
extended, and the result is loaded into the rd register. The content of the rs register is not
altered.
(4) Delayed instruction
This instruction may be executed as a delayed 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) sub %r0,%r0 ; r0 = r0 - r0
(2)
ext 0x1
ext 0x1fff
sub %r1,%r2 ; r1 = r2 - 0x3fff
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