62 lines
766 B
ArmAsm
62 lines
766 B
ArmAsm
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.define .sri4
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! Shift 32 bits signed or unsigned integer right
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! Expects in a-reg.: 1 if signed integer
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! 0 if unsigned integer
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! Expects on stack: number of shifts
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! number to be shifted
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! Yields on stack: result
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.sri4: pop h
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shld .retadr
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mov h,b
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mov l,c
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shld .bcreg
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pop b !number of shifts
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pop d !low-order bytes of number to be shifted
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pop h !high-order bytes
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mvi b,0
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ora a
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jz 1f !jump if unsigned integer
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mov a,h
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ral
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jnc 1f !jump if positive signed integer
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mvi b,255
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1: mov a,c
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cpi 32
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jnc 3f
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2: dcr c
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jm 4f
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mov a,b
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rar
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mov a,h
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rar
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mov h,a
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mov a,l
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rar
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mov l,a
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mov a,d
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rar
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mov d,a
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mov a,e
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rar
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mov e,a
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jmp 2b
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3: mov d,b
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mov e,b
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mov h,b
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mov l,b
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4: push h
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push d
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lhld .bcreg
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mov b,h
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mov c,l
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lhld .retadr
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pchl
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