satsub

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

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SATSUB reg1, reg2

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SATSUB reg1, reg2, reg3

 

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In asrh, the following formats can also be used in addition to the above.

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satsub imm, reg2

 

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If the instruction is executed in syntax "satsub imm, reg2", the assembler executes instruction expansion to generate one or more machine instructions.

(a)

0

satsub  0, reg
 
satsub  r0, reg

(b)

Absolute expression having a value in the range of -32,768 to +32,767

satsub  imm16, reg
 
satsubi imm16, reg, reg

(c)

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

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

 

Else

satsub  imm, reg
 
mov     imm, r1
satsub  r1, reg

(d)

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

satsub  !label, reg
 
satsubi !label, reg, reg
 
satsub  %label, reg
 
satsubi %label, reg, reg
 
satsub  $label, reg
 
satsubi $label, reg, reg

(e)

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

satsub  #label, reg
 
mov     #label, r1
satsub  r1, reg
 
satsub  label, reg
 
mov     label, r1
satsub  r1, reg
 
satsub  $label, reg
 
mov     $label, r1
satsub  r1, reg

 


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