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1 | \ ========== Copyright Header Begin ========================================== |
2 | \ | |
3 | \ Hypervisor Software File: dmul.fth | |
4 | \ | |
5 | \ Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved. | |
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10 | \ or without modification, are permitted provided that the following | |
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14 | \ this list of conditions and the following disclaimer. | |
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20 | \ Neither the name of Sun Microsystems, Inc. or the names of contributors | |
21 | \ may be used to endorse or promote products derived from this software | |
22 | \ without specific prior written permission. | |
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24 | \ This software is provided "AS IS," without a warranty of any kind. | |
25 | \ ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, | |
26 | \ INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A | |
27 | \ PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN | |
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29 | \ ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR | |
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37 | \ You acknowledge that this software is not designed, licensed or | |
38 | \ intended for use in the design, construction, operation or maintenance of | |
39 | \ any nuclear facility. | |
40 | \ | |
41 | \ ========== Copyright Header End ============================================ | |
42 | \ dmul.fth 1.1 95/03/04 | |
43 | \ Copyright 1994 FirmWorks | |
44 | ||
45 | \ AB * CD = BD + (BC + DA)<<bits/half-cell + AC<<bits/cell | |
46 | : half* ( h1 h2 -- low<< high ) * split-halves swap scale-up swap ; | |
47 | : um* ( n1 n2 -- xlo xhi ) | |
48 | split-halves rot split-halves ( b a d c ) | |
49 | ||
50 | \ Easy case - high halves are both 0, so result is just BD | |
51 | 2 pick over or 0= if drop nip * 0 exit then | |
52 | ||
53 | 3 pick 2 pick * 0 2>r ( b a d c ) ( r: d.low ) | |
54 | ||
55 | \ Check for C = 0 and optimize if so | |
56 | dup if ( b a d c ) ( r: d.low ) | |
57 | \ C is not zero, so compute and add BC<< | |
58 | 3 pick over half* | |
59 | 2r> d+ 2>r ( b a d c ) ( r: d.intermed ) | |
60 | ||
61 | \ We are done with B | |
62 | 2swap nip ( d c a ) | |
63 | \ Check for A = 0 and optimize if so | |
64 | dup if ( d c a ) | |
65 | \ A is not zero, so compute and add DA<< and AC<<< | |
66 | rot over half* ( c a da.low da.high ) | |
67 | 2r> d+ 2>r ( c a ) ( r: d.intermed' ) | |
68 | * 0 swap 2r> d+ | |
69 | else | |
70 | \ A is zero, so we are finished | |
71 | 3drop 2r> | |
72 | then | |
73 | else | |
74 | \ C is zero, so all we have to do is compute and add DA<< | |
75 | drop rot drop ( a d ) ( r: d.low ) | |
76 | half* ( low1 high1 ) | |
77 | 2r> d+ | |
78 | then | |
79 | ; |