cmp


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The cmp instructions of the device should be specified in the following formats.

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CMP reg1, reg2

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CMP imm5, reg2

 

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If the following is specified as imm in syntax "cmp imm, reg2", the assembler executes instruction expansion to generate multiple machine instructions.

(a)

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

cmp     imm16, reg
movea   imm16, r0, r1
cmp     r1, reg

(b)

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

cmp     imm, reg
movhi   HIGHW(imm), r0, r1
cmp     r1, reg

 

Else

cmp     imm, reg
mov     imm, r1
cmp     r1, reg

(c)

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

cmp     !label, reg
movea   !label, r0, r1
cmp     r1, reg
cmp     %label, reg
movea   %label, r0, r1
cmp     r1, reg
cmp     $label, reg
movea   $label, r0, r1
cmp     r1, reg

(d)

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

cmp     #label, reg
mov     #label, r1
cmp     r1, reg
cmp     label, reg
mov     label, r1
cmp     r1, reg
cmp     $label, reg
mov     $label, r1
cmp     r1, reg