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| author | Clifford Wolf <clifford@clifford.at> | 2019-03-14 17:51:21 +0100 |
|---|---|---|
| committer | Clifford Wolf <clifford@clifford.at> | 2019-03-14 17:51:21 +0100 |
| commit | 17caaa3fa898e39d1dbcfd8b92750a9d713a24af (patch) | |
| tree | 5702034ed2245a403d2921a8edb35be76ae46a02 /frontends | |
| parent | 04e920337b1b984929d3d69fb2ab1f8b1e92f032 (diff) | |
| download | yosys-17caaa3fa898e39d1dbcfd8b92750a9d713a24af.tar.gz yosys-17caaa3fa898e39d1dbcfd8b92750a9d713a24af.tar.bz2 yosys-17caaa3fa898e39d1dbcfd8b92750a9d713a24af.zip | |
Improve handling of "full_case" attributes
Signed-off-by: Clifford Wolf <clifford@clifford.at>
Diffstat (limited to 'frontends')
| -rw-r--r-- | frontends/ast/genrtlil.cc | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/frontends/ast/genrtlil.cc b/frontends/ast/genrtlil.cc index d7da6fb40..b3a2a84be 100644 --- a/frontends/ast/genrtlil.cc +++ b/frontends/ast/genrtlil.cc @@ -525,7 +525,16 @@ struct AST_INTERNAL::ProcessGenerator } 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(); + #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 { if (default_case == NULL) { default_case = new RTLIL::CaseRule; |