[Omake] SVN Commit: OMake Build System [0.9.8.x] (Rev. 10258)

[Aleksey Nogin]

Further optimized the path code, finally bringing the performance close to
what it was before the hash-cons patch was applied.

The problem was that when appending an extra path (which might contain ".."
somehere inside) to a directory, it would fully reconstruct the directory and
then construct it from scratch again. In presence of cons-hashing this is
really expensive.

The obvious solution is not to deconstruct and only pop one level every time
the ".." is encountered.

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Changes:
    +29 -38	omake-branches/0.9.8.x/src/ir/omake_node.ml
 
A hyperlinked version of this commit is available at
http://svn.metaprl.org/commitlogs/omake/2007-03.html#07/03/20.17:06:04