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| <h2 class="chapter">25 Match and Simplify</h2> |
| <a name="index-Match-and-Simplify"></a> |
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| <p>The GIMPLE and GENERIC pattern matching project match-and-simplify |
| tries to address several issues. |
| </p> |
| <ol> |
| <li> unify expression simplifications currently spread and duplicated |
| over separate files like fold-const.c, gimple-fold.c and builtins.c |
| </li><li> allow for a cheap way to implement building and simplifying |
| non-trivial GIMPLE expressions, avoiding the need to go through |
| building and simplifying GENERIC via fold_buildN and then |
| gimplifying via force_gimple_operand |
| </li></ol> |
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| <p>To address these the project introduces a simple domain specific language |
| to write expression simplifications from which code targeting GIMPLE |
| and GENERIC is auto-generated. The GENERIC variant follows the |
| fold_buildN API while for the GIMPLE variant and to address 2) new |
| APIs are introduced. |
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