From 17caaa3fa898e39d1dbcfd8b92750a9d713a24af Mon Sep 17 00:00:00 2001
From: Clifford Wolf <clifford@clifford.at>
Date: Thu, 14 Mar 2019 17:51:21 +0100
Subject: Improve handling of "full_case" attributes
Signed-off-by: Clifford Wolf <clifford@clifford.at>
---
frontends/ast/genrtlil.cc | 9 +++++++++
1 file changed, 9 insertions(+)
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;
--
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