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eliminate pmux in functional backend

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This commit is contained in:
Emily Schmidt 2024-07-17 13:35:58 +01:00
parent c0c90c2c31
commit 13bacc5c8f
5 changed files with 9 additions and 40 deletions
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11
kernel/functionalir.cc
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@ -52,7 +52,6 @@ const char *FunctionalIR::fn_to_string(FunctionalIR::Fn fn) {
case FunctionalIR::Fn::logical_shift_right: return "logical_shift_right";
case FunctionalIR::Fn::arithmetic_shift_right: return "arithmetic_shift_right";
case FunctionalIR::Fn::mux: return "mux";
case FunctionalIR::Fn::pmux: return "pmux";
case FunctionalIR::Fn::constant: return "constant";
case FunctionalIR::Fn::input: return "input";
case FunctionalIR::Fn::state: return "state";
@ -165,6 +164,14 @@ private:
return factory.mux(y0, y1, factory.slice(s, sn - 1, 1));
}
}
Node handle_pmux(Node a, Node b, Node s) {
// TODO : what to do about multiple b bits set ?
log_assert(b.width() == a.width() * s.width());
Node y = a;
for(int i = 0; i < s.width(); i++)
y = factory.mux(y, factory.slice(b, a.width() * i, a.width()), factory.slice(s, i, 1));
return y;
}
public:
Node handle(IdString cellType, dict<IdString, Const> parameters, dict<IdString, Node> inputs)
{
@ -266,7 +273,7 @@ public:
}else if(cellType == ID($mux)){
return factory.mux(inputs.at(ID(A)), inputs.at(ID(B)), inputs.at(ID(S)));
}else if(cellType == ID($pmux)){
return factory.pmux(inputs.at(ID(A)), inputs.at(ID(B)), inputs.at(ID(S)));
return handle_pmux(inputs.at(ID(A)), inputs.at(ID(B)), inputs.at(ID(S)));
}else if(cellType == ID($concat)){
Node a = inputs.at(ID(A));
Node b = inputs.at(ID(B));