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1.1 root 1: .th COMPAR III 1/15/73
2: .sh NAME
3: compar \*- default comparison routine for qsort
4: .sh SYNOPSIS
5: .ft B
6: jsr pc,compar
7: .ft R
8: .sh DESCRIPTION
9: .it Compar
10: is the default comparison routine
11: called by \fIqsort\fR and is separated out so that the user can
12: supply his own comparison.
13: .s3
14: The routine is called with the width (in bytes) of
15: an element in r3 and it compares byte-by-byte the element
16: pointed to by r0 with the element pointed to by r4.
17: .s3
18: Return is via the condition codes,
19: which are tested by the instructions ``blt'' and ``bgt''.
20: That is, in the absence of overflow, the
21: condition (r0) < (r4) should leave the Z-bit off and N-bit
22: on while (r0) > (r4) should leave Z and N off.
23: Still another way of putting it is that for elements
24: of length 1 the instruction
25: .s3
26: cmpb (r0),(r4)
27: .s3
28: suffices.
29: .s3
30: Only r0 is changed by the call.
31: .sh "SEE ALSO"
32: qsort (III)
33: .sh BUGS
34: It could be recoded to run faster.
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