29 lines
453 B
ArmAsm
29 lines
453 B
ArmAsm
.define .inn
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! $Header$
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! #bytes in cx
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! bit # in ax
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.inn:
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pop bx ! return address
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xor dx,dx
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xor si,si
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mov di,8
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div di
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mov di,sp
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add di,ax
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cmp ax,cx
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xchg ax,dx
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xchg ax,si ! ax:=si,si:=dx,does not change carry
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jae 1f
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movb dl,bits(si)
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testb (di),dl
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jz 1f
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inc ax
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1:
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add sp,cx
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! ax is result
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jmp bx
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.data
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bits:
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.byte 1,2,4,8,16,32,64,128
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