50 lines
580 B
ArmAsm
50 lines
580 B
ArmAsm
.define .sli4
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.sect .text
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.sect .rom
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.sect .data
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.sect .bss
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.sect .text
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! Shift 32 bits integer left
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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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.sli4:
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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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mov a,b !if bc>=32 return 0
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ora a
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jnz 2f
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mov a,c
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cpi 32
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jnc 2f
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1: dcr c
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jm 3f
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dad h
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xchg
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dad h
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xchg
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jnc 1b
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inx h
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jmp 1b
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2: lxi h,0
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lxi d,0
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3: 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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