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Improve handling of "full_case" attributes

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Signed-off-by: Clifford Wolf <clifford@clifford.at>
This commit is contained in:
Clifford Wolf 2019-03-14 17:51:21 +01:00
parent 04e920337b
commit 17caaa3fa8
1 changed files with 9 additions and 0 deletions
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9
frontends/ast/genrtlil.cc
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@ -525,7 +525,16 @@ struct AST_INTERNAL::ProcessGenerator
} }
if (last_generated_case != NULL && ast->get_bool_attribute("\\full_case") && default_case == NULL) { if (last_generated_case != NULL && ast->get_bool_attribute("\\full_case") && default_case == NULL) {
#if 0
// this is a valid transformation, but as optimization it is premature.
// better: add a default case that assigns 'x' to everything, and let later
// optimizations take care of the rest
last_generated_case->compare.clear(); last_generated_case->compare.clear();
#else
default_case = new RTLIL::CaseRule;
addChunkActions(default_case->actions, this_case_eq_ltemp, SigSpec(State::Sx, GetSize(this_case_eq_rvalue)));
sw->cases.push_back(default_case);
#endif
} else { } else {
if (default_case == NULL) { if (default_case == NULL) {
default_case = new RTLIL::CaseRule; default_case = new RTLIL::CaseRule;