sub | CS+ V4.01.00

sub

Subtracts.

[Syntax]

-	sub reg1, reg2

-	sub imm, reg2

The following can be specified for imm:

-	Absolute expression having a value of up to 32 bits

-	Relative expression

[Function]

-	Syntax "sub reg1, reg2"

Subtracts the value of the register specified by the first operand from the value of the register specified by the second operand, and stores the result in the register specified by the second operand.

-	Syntax "sub imm, reg2"

Subtracts the value of the absolute expression or relative expression specified by the first operand from the value of the register specified by the second operand, and stores the result into the register specified by the second operand.

[Description]

-	If the instruction is executed in syntax "sub reg1, reg2", the assembler generates one sub machine instruction.

-	If the instruction is executed in syntax "sub imm, reg2", the assembler executes instruction expansion and generates one or more machine instructionsNote.

(a)

sub     0, reg

sub     r0, reg

(b)	Absolute expression having a value of other than 0 within the range of -16 to +15

sub     imm5, reg

mov     imm5, r1

sub     r1, reg

(c)	Absolute expression exceeding the range of -16 to +15, but within the range of -32,768 to +32,767

sub     imm16, reg

movea   imm16, r0, r1

sub     r1, reg

(d)	Absolute expression having a value exceeding the range of -32,768 to +32,767

If all the lower 16 bits of the value of imm are 0

sub     imm, reg

movhi   HIGHW(imm), r0, r1

sub     r1, reg

Else

sub     imm, reg

mov     imm, r1

sub     r1, reg

(e)	Relative expression having !label or %label, or that having $label for a label having a definition in the sdata/sbss-attribute section

sub     !label, reg

movea   !label, r0, r1

sub     r1, reg

sub     %label, reg

movea   %label, r0, r1

sub     r1, reg

sub     $label, reg

movea   $label, r0, r1

sub     r1, reg

(f)	Relative expression having #label or label, or that having $label for a label having no definition in the sdata/sbss-attribute section

sub     #label, reg

mov     #label, r1

sub     r1, reg

sub     label, reg

mov     label, r1

sub     r1, reg

sub     $label, reg

mov     $label, r1

sub     r1, reg

Note	The sub machine instruction does not take an immediate value as an operand.

[Flag]

CY	1 if a borrow occurs from MSB (Most Significant Bit),0 if not
OV	1 if Integer-Overflow occurs, 0 if not
S	1 if the result is negative, 0 if not
Z	1 if the result is 0, 0 if not
SAT	---