Internals: Favor std::array. No functional change intended.

src/V3GraphPathChecker.cpp

@@ -35,7 +35,7 @@ struct GraphPCNode final {
     //
     // Unlike the LogicMTasks's, we have no cost info for the generic graph
     // accepted by GraphPathChecker, so assume each node has unit cost.
-    std::array<uint32_t, GraphWay::NUM_WAYS> m_cp;
+    std::array<uint32_t, GraphWay::NUM_WAYS> m_cp = {};
 
     // Detect if we've seen this node before in a given recursive
     // operation. We'll use this in pathExistsInternal() to avoid checking
@@ -44,9 +44,7 @@ struct GraphPCNode final {
     uint64_t m_seenAtGeneration = 0;
 
     // CONSTRUCTORS
-    GraphPCNode() {
-        for (unsigned int& w : m_cp) w = 0;
-    }
+    GraphPCNode() {}
     ~GraphPCNode() = default;
 };
 

src/V3OrderParallel.cpp

@@ -332,7 +332,7 @@ private:
     // Cost of critical paths going FORWARD from graph-start to the start
     // of this vertex, and also going REVERSE from the end of the graph to
     // the end of the vertex. Same units as m_cost.
-    std::array<uint64_t, GraphWay::NUM_WAYS> m_critPathCost;
+    std::array<uint64_t, GraphWay::NUM_WAYS> m_critPathCost = {};
 
     const uint32_t m_id;  // Unique LogicMTask ID number
     static uint32_t s_nextId;  // Next ID number to use
@@ -361,7 +361,6 @@ public:
         : V3GraphVertex{graphp}
         , m_id{s_nextId++} {
         UASSERT(s_nextId < 0xFFFFFFFFUL, "Too many mTaskGraphp");
-        for (uint64_t& item : m_critPathCost) item = 0;
         if (mVtxp) {
             m_mVertices.linkBack(mVtxp);
             if (const OrderLogicVertex* const olvp = mVtxp->logicp()) {

src/V3Stats.cpp

@@ -34,11 +34,11 @@ V3Mutex V3Stats::s_mutex;
 class StatsVisitor final : public VNVisitorConst {
     struct Counters final {
         // Nodes of given type
-        uint64_t m_statTypeCount[VNType::_ENUM_END];
+        std::array<uint64_t, VNType::_ENUM_END> m_statTypeCount = {};
         // Nodes of given type with given type immediate child
-        uint64_t m_statAbove[VNType::_ENUM_END][VNType::_ENUM_END];
+        std::array<std::array<uint64_t, VNType::_ENUM_END>, VNType::_ENUM_END> m_statAbove = {};
         // Prediction of given type
-        uint64_t m_statPred[VBranchPred::_ENUM_END];
+        std::array<uint64_t, VBranchPred::_ENUM_END> m_statPred = {};
     };
 
     // STATE
@@ -103,9 +103,6 @@ public:
         : m_fastOnly{fastOnly}
         , m_accump{fastOnly ? &m_dumpster : &m_counters} {
         UINFO(9, "Starting stats, fastOnly=" << fastOnly);
-        memset(&m_counters, 0, sizeof(m_counters));
-        memset(&m_dumpster, 0, sizeof(m_dumpster));
-
         iterateConst(nodep);
 
         // Shorthand

src/V3Undriven.cpp

@@ -293,7 +293,7 @@ class UndrivenVisitor final : public VNVisitorConst {
     const VNUser2InUse m_inuser2;
 
     // STATE
-    std::array<std::vector<UndrivenVarEntry*>, 3> m_entryps;  // Nodes to delete when finished
+    std::array<std::vector<UndrivenVarEntry*>, 3> m_entryps = {};  // Nodes to delete when finished
     bool m_inBBox = false;  // In black box; mark as driven+used
     bool m_inContAssign = false;  // In continuous assignment
     bool m_inInitialStatic = false;  // In InitialStatic