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revision 701 by ph10, Tue Sep 20 11:30:56 2011 UTC revision 702 by ph10, Tue Sep 20 15:45:06 2011 UTC
# Line 59  Version 8.20 12-Sep-2011 Line 59  Version 8.20 12-Sep-2011
59    
60  10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that  10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
61      the first byte in a match must be "a".      the first byte in a match must be "a".
62    
63    11. Change 17 for 8.13 increased the recursion depth for patterns like
64        /a(?:.)*?a/ drastically. I've improved things by remembering whether a
65        pattern contains any instances of (*THEN). If it does not, the old
66        optimizations are restored. It would be nice to do this on a per-group
67        basis, but at the moment that is not feasible.
68    
69    
70  Version 8.13 16-Aug-2011  Version 8.13 16-Aug-2011
# Line 158  Version 8.13 16-Aug-2011 Line 164  Version 8.13 16-Aug-2011
164      tail recursion to cut down on stack usage. Unfortunately, now that there is      tail recursion to cut down on stack usage. Unfortunately, now that there is
165      the possibility of (*THEN) occurring in these branches, tail recursion is      the possibility of (*THEN) occurring in these branches, tail recursion is
166      no longer possible because the return has to be checked for (*THEN). These      no longer possible because the return has to be checked for (*THEN). These
167      two optimizations have therefore been removed.      two optimizations have therefore been removed. [But see 8.20/11 above.]
168    
169  18. If a pattern containing \R was studied, it was assumed that \R always  18. If a pattern containing \R was studied, it was assumed that \R always
170      matched two bytes, thus causing the minimum subject length to be      matched two bytes, thus causing the minimum subject length to be

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