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DFG: Support AstSel and AstConcat on LHS of assignments

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Added DfgVertexVariadic to represent DFG vetices with a varying number
of source operands. Converted DfgVar to be a variadic vertex, with each
driver corresponding to a fixed range of bits in the packed variable.
This allows us to handle AstSel on the LHS of assignments. Also added
support for AstConcat on the LHS by selecting into the RHS as
appropriate.

This improves OpenTitan ST speed by ~13%
This commit is contained in:
Geza Lore
2022-09-26 19:54:52 +01:00
parent 9c1cc5465d
commit 1b17acdb01
6 changed files with 406 additions and 141 deletions
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src/V3Dfg.cpp
+7 -3
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@@ -251,7 +251,7 @@ static void dumpDotVertexAndSourceEdges(std::ostream& os, const DfgVertex& vtx)
vtx.forEachSourceEdge([&](const DfgEdge& edge, size_t idx) { //
if (edge.sourcep()) {
string headLabel;
if (vtx.arity() > 1) headLabel = std::toupper(vtx.srcName(idx)[0]);
if (vtx.arity() > 1) headLabel = vtx.srcName(idx);
dumpDotEdge(os, edge, headLabel);
}
});
@@ -502,11 +502,15 @@ void DfgVertex::replaceWith(DfgVertex* newSorucep) {
void DfgVar::accept(DfgVisitor& visitor) { visitor.visit(this); }
bool DfgVar::selfEquals(const DfgVertex& that) const {
if (const DfgVar* otherp = that.cast<DfgVar>()) return varp() == otherp->varp();
if (const DfgVar* otherp = that.cast<DfgVar>()) {
UASSERT_OBJ(varp() != otherp->varp() || this == otherp, this,
"There should only be one DfgVar for a given AstVar");
return this == otherp;
}
return false;
}
V3Hash DfgVar::selfHash() const { return V3Hasher::uncachedHash(m_varp); }
V3Hash DfgVar::selfHash() const { return V3Hasher::uncachedHash(varp()); }
// DfgConst ----------
void DfgConst::accept(DfgVisitor& visitor) { visitor.visit(this); }