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C/C++ Users Group Library 1996 July
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C-C++ Users Group Library July 1996.iso
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v_09_11
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9n11068b
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1991-08-27
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912b
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31 lines
Listing 2:
# compiled using cc -O -S fib.c
_fib:
link a6,#-8 # set local frame pointer
cmpl #2,a6@(8) # determine if n<2
jgt L20
moveq #1,d0 # return 1 in d0
jra LE18
L20:
movl a6@(8),d0 # copy in-coming parameter from stack
subql #2,d0
movl d0,sp@- # stack out-going parameter n-2
jbsr _fib
addqw #4,sp
movl d0,a6@(-8) # copy fib(n-2) result to memory
movl a6@(8),d0 # copy in-coming parameter from stack
subql #1,d0
movl d0,sp@- # stack out-going parameter n-1
jbsr _fib
addqw #4,sp
addl a6@(-8),d0 # add fib(n-2) and fib(n-1)
movl d0,a6@(-4) # result in d0
LE18:
unlk a6
rts