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proc_clean: remove any empty cases if all cases use all-def compare.

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This commit is contained in:
whitequark 2018-12-23 09:04:23 +00:00
parent b784440857
commit 18291c20d2
3 changed files with 42 additions and 6 deletions
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34
passes/proc/proc_clean.cc
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@ -77,14 +77,36 @@ void proc_clean_switch(RTLIL::SwitchRule *sw, RTLIL::CaseRule *parent, bool &did
}
else
{
for (auto cs : sw->cases) {
bool all_fully_def = true;
for (auto cs : sw->cases)
{
if (max_depth != 0)
proc_clean_case(cs, did_something, count, max_depth-1);
for (auto cmp : cs->compare)
if (!cmp.is_fully_def())
all_fully_def = false;
}
while (!sw->cases.empty() && (sw->cases.back()->actions.empty() && sw->cases.back()->switches.empty())) {
did_something = true;
delete sw->cases.back();
sw->cases.pop_back();
if (all_fully_def)
{
for (auto cs = sw->cases.begin(); cs != sw->cases.end();)
{
if ((*cs)->empty())
{
did_something = true;
delete *cs;
cs = sw->cases.erase(cs);
}
else ++cs;
}
}
else
{
while (!sw->cases.empty() && sw->cases.back()->empty())
{
did_something = true;
delete sw->cases.back();
sw->cases.pop_back();
}
}
}
}
@ -102,7 +124,7 @@ void proc_clean_case(RTLIL::CaseRule *cs, bool &did_something, int &count, int m
}
for (size_t i = 0; i < cs->switches.size(); i++) {
RTLIL::SwitchRule *sw = cs->switches[i];
if (sw->cases.size() == 0) {
if (sw->empty()) {
cs->switches.erase(cs->switches.begin() + (i--));
did_something = true;
delete sw;