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C-Reduce TODO list:

write some documentation about creating a c-reduce pass: side effects,
directory restrictions, etc.

Konstantin suggestion:
  deal with un-preprocessed code in a smart way, for example by
  incrementally preprocessing files from inside c-reduce

implement suggestion from Joerg Sonnenberger:
  do transformations in chunks, like the line-reducer pass already does
  requires a good model of when this will be profitable

make it again possible to run just selected passes

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clang_delta TODO list:

replace for-loops with expressions guessed from initializers
  guess that it executes 0 and 1 times 

change operators to other operators, e.g., replace / with +

- From Konstantin Tokarev

As you may know, there is a clang-based tool "Include What You Use"
[1]. I think similar approach could be useful in C-Reduce to remove
whole header files instead of separate lines. Though I'm not sure it's
feasible without non-preprocessed source file and compilation command
line available.

I can imagine the next algorithm of reduction:

1. Reduce only the last section of translation unit corresponding to
original source file without #includes using all available passes.
2. Try to remove sections corresponding to "unused" headers
3. Move to section N-1 and proceed.

Assuming that "interesting" fragment of code is located in sections
with big numbers (source file and local headers) while first sections
contain library headers, this approach might be more efficient than
traditional line-based reduction.

[1] http://code.google.com/p/include-what-you-use

- (low priority) format string reductions:

 * remove anything that's not a %d or whatever from the format string

 * remove a %d directive and also the corresponding argument from a printf 

- constant folding

- (low priority) constant-propagation

- (low priority) replace peephole passes in c_reduce

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