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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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12
kernel/functionalir.h
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@ -119,11 +119,6 @@ public:
arithmetic_shift_right,
// mux(a: bit[N], b: bit[N], s: bit[1]): bit[N] = s ? b : a
mux,
// pmux(a: bit[N], b: bit[N*M], s: bit[M]): bit[N]
// required: no more than one bit in b is set
// if s[i] = 1 for any i, then returns b[i * N +: N]
// returns a if s == 0
pmux,
// constant(a: Const[N]): bit[N] = a
constant,
// input(a: IdString): any
@ -277,7 +272,6 @@ public:
case Fn::logical_shift_right: return v.logical_shift_right(*this, arg(0), arg(1)); break;
case Fn::arithmetic_shift_right: return v.arithmetic_shift_right(*this, arg(0), arg(1)); break;
case Fn::mux: return v.mux(*this, arg(0), arg(1), arg(2)); break;
case Fn::pmux: return v.pmux(*this, arg(0), arg(1), arg(2)); break;
case Fn::constant: return v.constant(*this, _ref.function().as_const()); break;
case Fn::input: return v.input(*this, _ref.function().as_idstring()); break;
case Fn::state: return v.state(*this, _ref.function().as_idstring()); break;
@ -320,7 +314,6 @@ public:
virtual T logical_shift_right(Node self, Node a, Node b) = 0;
virtual T arithmetic_shift_right(Node self, Node a, Node b) = 0;
virtual T mux(Node self, Node a, Node b, Node s) = 0;
virtual T pmux(Node self, Node a, Node b, Node s) = 0;
virtual T constant(Node self, RTLIL::Const value) = 0;
virtual T input(Node self, IdString name) = 0;
virtual T state(Node self, IdString name) = 0;
@ -359,7 +352,6 @@ public:
T logical_shift_right(Node self, Node, Node) override { return default_handler(self); }
T arithmetic_shift_right(Node self, Node, Node) override { return default_handler(self); }
T mux(Node self, Node, Node, Node) override { return default_handler(self); }
T pmux(Node self, Node, Node, Node) override { return default_handler(self); }
T constant(Node self, RTLIL::Const) override { return default_handler(self); }
T input(Node self, IdString) override { return default_handler(self); }
T state(Node self, IdString) override { return default_handler(self); }
@ -451,10 +443,6 @@ public:
log_assert(a.sort().is_signal() && a.sort() == b.sort() && s.sort() == Sort(1));
return add(Fn::mux, a.sort(), {a, b, s});
}
Node pmux(Node a, Node b, Node s) {
log_assert(a.sort().is_signal() && b.sort().is_signal() && s.sort().is_signal() && a.sort().width() * s.sort().width() == b.sort().width());
return add(Fn::pmux, a.sort(), {a, b, s});
}
Node memory_read(Node mem, Node addr) {
log_assert(mem.sort().is_memory() && addr.sort().is_signal() && mem.sort().addr_width() == addr.sort().width());
return add(Fn::memory_read, Sort(mem.sort().data_width()), {mem, addr});