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Optimizer - More notes

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Emmanuel BENOîT 2017-12-10 11:20:25 +01:00
parent cb42137592
commit b2c11d8d2a
1 changed files with 9 additions and 0 deletions
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9
c-opopt.cc
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@ -762,6 +762,15 @@ void T_OptData::buildUseDefineChains(
* Entering/exiting functions is a bit of a PITA: * Entering/exiting functions is a bit of a PITA:
* - call instructions define function arguments; * - call instructions define function arguments;
* - return edges kill locals * - return edges kill locals
*
* OK, so now that we have edge types, things should be easier, as we
* can:
* - handle arguments directly; they're immutable and always
* defined at the function's call site.
* - handle local variables by walking the function's graph,
* ignoring all CALL edges and terminating at the RET edge;
* - handle globals by following all edges and terminating at the
* exit node
*/ */
#if 0 #if 0
// Walk the graph from the entry point until all reachable nodes // Walk the graph from the entry point until all reachable nodes