Internals: Dump Ast expression pattern statistics like Dfg (#7818)

Remove the expression combination counts from the default stats file,
and add a new `--dump-ast-patterns` option, which will dump new
`*_ast_patterns_*.txt` files. These contain the expression combinations
in a similar S-expression format as Dfg already produces with
`--dump-dfg-stats`. These dumps are not produced by just `--stats` as
they are fairly expensive to compute. Currently the new option will dump
at two points: just before we change to C types via widthMin usage, and
just before emit.
This commit is contained in:
Geza Lore 2026-06-21 22:17:36 +01:00 committed by GitHub
parent fbea10b427
commit eafe9636cf
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GPG Key ID: B5690EEEBB952194
17 changed files with 633 additions and 115 deletions

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@ -438,6 +438,7 @@ detailed descriptions of these arguments.
--diagnostics-sarif-output <filename> Set SARIF diagnostics output file
--dpi-hdr-only Only produce the DPI header file
--dump-<srcfile> Enable dumping everything in source file
--dump-ast-patterns Enable dumping Ast pattern statistics
--dump-defines Show preprocessor defines with -E
--dump-dfg Enable dumping DfgGraphs to .dot files
--dump-dfg-patterns Enable dumping Dfg pattern statistics

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@ -491,6 +491,10 @@ Summary:
Rarely needed - for developer use. Enable all dumping in the given
source file at level 3.
.. option:: --dump-ast-patterns
Rarely needed. Enable dumping AstNodeExpr pattern statistics.
.. option:: --dump-defines
With :vlopt:`-E`, suppress normal output, and instead print a list of

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@ -51,6 +51,7 @@ set(HEADERS
V3AstNodeExpr.h
V3AstNodeOther.h
V3AstNodeStmt.h
V3AstPatterns.h
V3AstUserAllocator.h
V3Begin.h
V3Branch.h
@ -250,7 +251,6 @@ set(COMMON_SOURCES
V3DfgDataType.cpp
V3DfgDecomposition.cpp
V3DfgDfgToAst.cpp
V3DfgDumpPatterns.cpp
V3DfgOptimizer.cpp
V3DfgPasses.cpp
V3DfgPeephole.cpp
@ -327,6 +327,7 @@ set(COMMON_SOURCES
V3ParseGrammar.cpp
V3ParseImp.cpp
V3ParseLex.cpp
V3PatternStats.cpp
V3PreProc.cpp
V3PreShell.cpp
V3Premit.cpp

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@ -264,7 +264,6 @@ RAW_OBJS_PCH_ASTNOMT = \
V3DfgDataType.o \
V3DfgDecomposition.o \
V3DfgDfgToAst.o \
V3DfgDumpPatterns.o \
V3DfgOptimizer.o \
V3DfgPasses.o \
V3DfgPeephole.o \
@ -314,6 +313,7 @@ RAW_OBJS_PCH_ASTNOMT = \
V3OrderProcessDomains.o \
V3OrderSerial.o \
V3Param.o \
V3PatternStats.o \
V3Premit.o \
V3ProtectLib.o \
V3RandSequence.o \

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@ -1745,6 +1745,156 @@ AstNodeDType* AstNode::getCommonClassTypep(AstNode* node1p, AstNode* node2p) {
return nullptr;
}
//######################################################################
// Renders the canonical pattern S-expression for a single AstNode
class VNPatternString final {
std::ostream& m_os;
std::map<std::string, std::string> m_internedConsts; // Interned constants
std::map<int, std::string> m_internedWordWidths; // Interned widths
std::map<int, std::string> m_internedWideWidths; // Interned widths
// Whether to dump the widhtMin as well
const bool m_dumpWidthMin = v3Global.widthMinUsage() != VWidthMinUsage::MATCHES_WIDTH;
static std::string toLetters(size_t value, bool lowerCase = false) {
const char base = lowerCase ? 'a' : 'A';
std::string s;
do { s += static_cast<char>(base + value % 26); } while (value /= 26);
return s;
}
const std::string& internConst(const AstConst& nodep) {
const auto pair = m_internedConsts.emplace(nodep.num().ascii(false), "");
if (pair.second) pair.first->second += toLetters(m_internedConsts.size() - 1);
return pair.first->second;
}
const std::string& internWordWidth(int value) {
const auto pair = m_internedWordWidths.emplace(value, "");
if (pair.second) pair.first->second += toLetters(m_internedWordWidths.size() - 1, true);
return pair.first->second;
}
const std::string& internWideWidth(int value) {
const auto pair = m_internedWideWidths.emplace(value, "");
if (pair.second) pair.first->second += toLetters(m_internedWideWidths.size() - 1);
return pair.first->second;
}
// True if the node has no operands (e.g. a VarRef or Const)
static bool isLeaf(const AstNode* nodep) {
const VNTypeInfo& typeInfo = VNType::typeInfo(nodep->type());
for (const VNTypeInfo::OpEn& opType : typeInfo.m_opType) {
if (opType != VNTypeInfo::OP_UNUSED) return false;
}
return true;
}
// Render operand, return true if not unused
void renderOperand(VNTypeInfo::OpEn opType, const AstNode* const opp, uint32_t depth) {
switch (opType) {
case VNTypeInfo::OP_UNUSED: //
break;
case VNTypeInfo::OP_USED: //
m_os << ' ';
render(opp, depth);
break;
case VNTypeInfo::OP_LIST:
m_os << " [";
for (const AstNode* nodep = opp; nodep; nodep = nodep->nextp()) {
if (nodep != opp) m_os << ", ";
render(opp, depth);
}
m_os << ']';
break;
case VNTypeInfo::OP_OPTIONAL:
if (opp) {
m_os << " ";
render(opp, depth);
} else {
m_os << " nil";
}
break;
}
}
// Render the node into the stream.
void render(const AstNode* nodep, uint32_t depth) {
if (const AstConst* const constp = VN_CAST(nodep, Const)) {
// Base case 1: constant
if (constp->isZero()) {
m_os << "(CONST ZERO)";
} else if (constp->isEqAllOnes()) {
m_os << "(CONST ONES)";
} else {
m_os << "(CONST #" << internConst(*constp) << ')';
}
} else if (isLeaf(nodep)) {
// Base case 2: expression with no operands (e.g. a variable reference)
m_os << '(' << nodep->typeName() << ')';
} else if (depth == 0) {
// Base case 3: deep expression
m_os << '_';
} else {
// Recursively print an S-expression for the expression
m_os << '(';
// Name
m_os << nodep->typeName();
// Operands
const VNTypeInfo& typeInfo = VNType::typeInfo(nodep->type());
renderOperand(typeInfo.m_opType[0], nodep->op1p(), depth - 1);
renderOperand(typeInfo.m_opType[1], nodep->op2p(), depth - 1);
renderOperand(typeInfo.m_opType[2], nodep->op3p(), depth - 1);
renderOperand(typeInfo.m_opType[3], nodep->op4p(), depth - 1);
// S-expression end
m_os << ')';
}
// Annotate type
m_os << ':';
const AstNodeDType* const dtypep = nodep->dtypep() ? nodep->dtypep()->skipRefp() : nullptr;
if (!dtypep) {
m_os << '?';
} else if (dtypep->isCompound() || VN_IS(dtypep, UnpackArrayDType)) {
dtypep->dumpSmall(m_os);
} else {
const int width = nodep->width();
if (width == 1) {
m_os << '1';
} else if (width <= VL_QUADSIZE) {
m_os << internWordWidth(width);
} else {
m_os << internWideWidth(width);
}
if (m_dumpWidthMin) {
m_os << '/';
const int widthMin = nodep->widthMin();
if (widthMin == 1) {
m_os << '1';
} else if (widthMin <= VL_QUADSIZE) {
m_os << internWordWidth(widthMin);
} else {
m_os << internWideWidth(widthMin);
}
}
}
}
public:
VNPatternString(std::ostream& os, const AstNode* nodep, uint32_t depth)
: m_os{os} {
render(nodep, depth);
}
};
std::string AstNodeExpr::patternString(uint32_t depth) const {
std::ostringstream oss;
VNPatternString{oss, this, depth};
return oss.str();
}
//######################################################################
// VNDeleter

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@ -73,6 +73,9 @@ public:
// Returns an error message if widthMin() is not correct otherwise returns nullptr like
// broken()
virtual const char* widthMismatch() const VL_MT_STABLE { return nullptr; }
// S-expression inspired dump of node and operands for debugging
std::string patternString(uint32_t depth = 0) const;
};
class AstNodeBiop VL_NOT_FINAL : public AstNodeExpr {
// Binary expression

34
src/V3AstPatterns.h Normal file
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@ -0,0 +1,34 @@
// -*- mode: C++; c-file-style: "cc-mode" -*-
//*************************************************************************
// DESCRIPTION: Verilator: Dump AstNodeExpr patterns for analysis
//
// Code available from: https://verilator.org
//
//*************************************************************************
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of either the GNU Lesser General Public License Version 3
// or the Perl Artistic License Version 2.0.
// SPDX-FileCopyrightText: 2003-2026 Wilson Snyder
// SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
//
//*************************************************************************
#ifndef VERILATOR_V3ASTPATTERNS_H_
#define VERILATOR_V3ASTPATTERNS_H_
#include "config_build.h"
#include "verilatedos.h"
class AstNetlist;
//============================================================================
class V3AstPatterns final {
public:
// Accumulate the patterns in the netlist, and dump the collected
// statistics to '<prefix>__ast_patterns_<suffix>.txt'.
static void dumpAll(const AstNetlist* nodep, const std::string& suffix) VL_MT_DISABLED;
};
#endif // Guard

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@ -959,6 +959,9 @@ void DfgVertex::unlinkDelete(DfgGraph& dfg) {
delete this;
}
//######################################################################
// Renders the canonical pattern S-expression for a single DfgVertex
class DfgPatternString final {
std::ostream& m_os;

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@ -1,92 +0,0 @@
// -*- mode: C++; c-file-style: "cc-mode" -*-
//*************************************************************************
// DESCRIPTION: Verilator: Implementations of simple passes over DfgGraph
//
// Code available from: https://verilator.org
//
//*************************************************************************
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of either the GNU Lesser General Public License Version 3
// or the Perl Artistic License Version 2.0.
// SPDX-FileCopyrightText: 2003-2026 Wilson Snyder
// SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
//
//*************************************************************************
#ifndef VERILATOR_V3DFGPATTERNSTATS_H_
#define VERILATOR_V3DFGPATTERNSTATS_H_
#include "V3Dfg.h"
#include "V3DfgPasses.h"
#include "V3File.h"
#include <unordered_map>
class V3DfgPatternStats final {
static constexpr uint32_t MIN_PATTERN_DEPTH = 1;
static constexpr uint32_t MAX_PATTERN_DEPTH = 4;
// Maps from pattern to the number of times it appears, for each pattern depth
std::vector<std::unordered_map<std::string, size_t>> m_patterCounts{MAX_PATTERN_DEPTH + 1};
void dump(std::ostream& os) {
using Line = std::pair<std::string, size_t>;
for (uint32_t i = MIN_PATTERN_DEPTH; i <= MAX_PATTERN_DEPTH; ++i) {
os << "DFG patterns with depth " << i << '\n';
// Pick up pattern accumulators with given depth
auto& patternCounts = m_patterCounts[i];
// Remove patterns also present at shallower depths
for (uint32_t j = MIN_PATTERN_DEPTH; j < i; ++j) {
for (const auto& pair : m_patterCounts[j]) patternCounts.erase(pair.first);
}
// Sort patterns, first by descending frequency, then lexically
std::vector<Line> lines;
lines.reserve(patternCounts.size());
for (const auto& pair : patternCounts) lines.emplace_back(pair);
std::sort(lines.begin(), lines.end(), [](const Line& a, const Line& b) {
if (a.second != b.second) return a.second > b.second;
return a.first < b.first;
});
// Print each pattern
for (const auto& line : lines) {
os << ' ' << std::setw(12) << std::right << line.second;
os << ' ' << std::left << line.first << '\n';
}
// Trailing new-line to separate sections
os << '\n';
}
}
public:
V3DfgPatternStats() = default;
~V3DfgPatternStats() {
// File to dump to
const std::string filename
= v3Global.opt.hierTopDataDir() + "/" + v3Global.opt.prefix() + "__dfg_patterns.txt";
// Open, write, close
const std::unique_ptr<std::ofstream> ofp{V3File::new_ofstream(filename)};
if (ofp->fail()) v3fatal("Can't write file: " << filename);
dump(*ofp);
}
void accumulate(const DfgGraph& dfg) {
dfg.forEachVertex([&](const DfgVertex& vtx) {
for (uint32_t i = MIN_PATTERN_DEPTH; i <= MAX_PATTERN_DEPTH; ++i) {
m_patterCounts[i][vtx.patternString(i)] += 1;
}
});
}
};
void V3DfgPasses::dumpPatterns(const std::vector<std::unique_ptr<DfgGraph>>& graphs) {
V3DfgPatternStats patternStats;
for (auto& cp : graphs) patternStats.accumulate(*cp);
}
#endif

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@ -67,7 +67,8 @@ void regularize(DfgGraph&, V3DfgRegularizeContext&) VL_MT_DISABLED;
// Convert DfgGraph back into Ast, and insert converted graph back into the Ast.
void dfgToAst(DfgGraph&, V3DfgContext&) VL_MT_DISABLED;
// Dump the patterns in the given graphs
void dumpPatterns(const std::vector<std::unique_ptr<DfgGraph>>&) VL_MT_DISABLED;
void dumpPatterns(const std::vector<std::unique_ptr<DfgGraph>>&,
const std::string& suffix = "") VL_MT_DISABLED;
//===========================================================================
// Intermediate/internal operations

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@ -552,6 +552,9 @@ public:
bool decorationNodes() const VL_MT_SAFE { return m_decorationNodes; }
bool diagnosticsSarif() const VL_MT_SAFE { return m_diagnosticsSarif; }
bool dpiHdrOnly() const { return m_dpiHdrOnly; }
bool dumpAstPatterns() const {
return m_dumpLevel.count("ast-patterns") && m_dumpLevel.at("ast-patterns");
}
bool dumpDefines() const { return m_dumpLevel.count("defines") && m_dumpLevel.at("defines"); }
bool dumpDfgPatterns() const {
return m_dumpLevel.count("dfg-patterns") && m_dumpLevel.at("dfg-patterns");

129
src/V3PatternStats.cpp Normal file
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@ -0,0 +1,129 @@
// -*- mode: C++; c-file-style: "cc-mode" -*-
//*************************************************************************
// DESCRIPTION: Verilator: Dump data structure pattern frequencies for analysis
//
// Code available from: https://verilator.org
//
//*************************************************************************
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of either the GNU Lesser General Public License Version 3
// or the Perl Artistic License Version 2.0.
// SPDX-FileCopyrightText: 2003-2026 Wilson Snyder
// SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
//
//*************************************************************************
#include "V3PchAstNoMT.h"
#include "V3Ast.h"
#include "V3AstPatterns.h"
#include "V3Dfg.h"
#include "V3DfgPasses.h"
#include "V3File.h"
#include <memory>
#include <unordered_map>
#include <vector>
VL_DEFINE_DEBUG_FUNCTIONS;
//============================================================================
// Accumulates and dumps the pattern statistics
class V3PatternStats VL_NOT_FINAL {
public:
static constexpr uint32_t MIN_PATTERN_DEPTH = 1;
static constexpr uint32_t MAX_PATTERN_DEPTH = 4;
private:
const std::string m_what; // Description of what is being dumped
// Maps from pattern to the number of times it appears, for each pattern depth
std::vector<std::unordered_map<std::string, size_t>> m_patternCounts{MAX_PATTERN_DEPTH + 1};
void dump(std::ostream& os) {
using Line = std::pair<std::string, size_t>;
for (uint32_t i = MIN_PATTERN_DEPTH; i <= MAX_PATTERN_DEPTH; ++i) {
os << m_what << " patterns with depth " << i << '\n';
// Pick up pattern accumulators with given depth
auto& patternCounts = m_patternCounts[i];
// Remove patterns also present at shallower depths
for (uint32_t j = MIN_PATTERN_DEPTH; j < i; ++j) {
for (const auto& pair : m_patternCounts[j]) patternCounts.erase(pair.first);
}
// Sort patterns, first by descending frequency, then lexically
std::vector<Line> lines;
lines.reserve(patternCounts.size());
for (const auto& pair : patternCounts) lines.emplace_back(pair);
std::sort(lines.begin(), lines.end(), [](const Line& a, const Line& b) {
if (a.second != b.second) return a.second > b.second;
return a.first < b.first;
});
// Print each pattern
for (const auto& line : lines) {
os << ' ' << std::setw(12) << std::right << line.second;
os << ' ' << std::left << line.first << '\n';
}
// Trailing new-line to separate sections
os << '\n';
}
}
public:
V3PatternStats(const std::string& what)
: m_what{what} {}
~V3PatternStats() = default;
void accumulate(const std::string& pattern, uint32_t depth) {
m_patternCounts[depth][pattern] += 1;
}
void dumpToFile(const std::string& filename) {
// Open, write, close
const std::unique_ptr<std::ofstream> ofp{V3File::new_ofstream(filename)};
if (ofp->fail()) v3fatal("Can't write file: " << filename);
dump(*ofp);
}
};
//============================================================================
// V3AstPatterns top level
void V3AstPatterns::dumpAll(const AstNetlist* nodep, const std::string& suffix) {
UINFO(2, __FUNCTION__ << ":");
V3PatternStats patternStats{"AST"};
nodep->foreach([&](const AstNodeExpr* exprp) {
for (uint32_t i = V3PatternStats::MIN_PATTERN_DEPTH;
i <= V3PatternStats::MAX_PATTERN_DEPTH; ++i) {
patternStats.accumulate(exprp->patternString(i), i);
}
});
const std::string fileName = v3Global.opt.hierTopDataDir() + "/" + v3Global.opt.prefix()
+ "__ast_patterns_" + suffix + ".txt";
patternStats.dumpToFile(fileName);
V3Global::dumpCheckGlobalTree("astpatterns", 0, false, false);
}
//============================================================================
// V3DfgPasses top level
void V3DfgPasses::dumpPatterns(const std::vector<std::unique_ptr<DfgGraph>>& graphs,
const std::string& suffix) {
V3PatternStats patternStats{"DFG"};
for (auto& cp : graphs) {
cp->forEachVertex([&](const DfgVertex& vtx) {
for (uint32_t i = V3PatternStats::MIN_PATTERN_DEPTH;
i <= V3PatternStats::MAX_PATTERN_DEPTH; ++i) {
patternStats.accumulate(vtx.patternString(i), i);
}
});
}
const std::string fileName = v3Global.opt.hierTopDataDir() + "/" + v3Global.opt.prefix()
+ "__dfg_patterns" + suffix + ".txt";
patternStats.dumpToFile(fileName);
}

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@ -35,15 +35,12 @@ class StatsVisitor final : public VNVisitorConst {
struct Counters final {
// Nodes of given type
std::array<uint64_t, VNType::NUM_TYPES()> m_statTypeCount{};
// Nodes of given type with given type immediate child
std::array<std::array<uint64_t, VNType::NUM_TYPES()>, VNType::NUM_TYPES()> m_statAbove{};
// Prediction of given type
std::array<uint64_t, VBranchPred::_ENUM_END> m_statPred{};
};
// STATE
const bool m_fastOnly; // When true, consider only fast functions
const AstNodeExpr* m_parentExprp = nullptr; // Parent expression
Counters m_counters; // The actual counts we will display
Counters m_dumpster; // Alternate buffer to make discarding parts of the tree easier
Counters* m_accump; // The currently active accumulator
@ -75,14 +72,6 @@ class StatsVisitor final : public VNVisitorConst {
countThenIterateChildren(nodep);
}
void visit(AstNodeExpr* nodep) override {
// Count expression combinations
if (m_parentExprp) ++m_accump->m_statAbove[m_parentExprp->type()][nodep->type()];
VL_RESTORER(m_parentExprp);
m_parentExprp = nodep;
countThenIterateChildren(nodep);
}
void visit(AstNodeIf* nodep) override {
// Track prediction
++m_accump->m_statPred[nodep->branchPred()];
@ -148,15 +137,6 @@ public:
}
}
// Expression combinations
for (size_t t1 = 0; t1 < VNType::NUM_TYPES(); ++t1) {
for (size_t t2 = 0; t2 < VNType::NUM_TYPES(); ++t2) {
if (const uint64_t c = m_counters.m_statAbove[t1][t2]) {
addStat("Expr combination, " + typeName(t1) + " over " + typeName(t2), c);
}
}
}
// Branch predictions
for (int t = 0; t < VBranchPred::_ENUM_END; ++t) {
if (const uint64_t c = m_counters.m_statPred[t]) {

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@ -22,6 +22,7 @@
#include "V3AssertNfa.h"
#include "V3AssertPre.h"
#include "V3Ast.h"
#include "V3AstPatterns.h"
#include "V3Begin.h"
#include "V3Branch.h"
#include "V3Broken.h"
@ -541,6 +542,8 @@ static void process() {
V3Const::constifyAll(v3Global.rootp());
V3Dead::deadifyAll(v3Global.rootp());
if (v3Global.opt.dumpAstPatterns()) V3AstPatterns::dumpAll(v3Global.rootp(), "prec");
// Here down, widthMin() is the Verilog width, and width() is the C++ width
// Bits between widthMin() and width() are irrelevant, but may be non-zero.
v3Global.widthMinUsage(VWidthMinUsage::VERILOG_WIDTH);
@ -635,6 +638,8 @@ static void process() {
}
}
if (v3Global.opt.dumpAstPatterns()) V3AstPatterns::dumpAll(v3Global.rootp(), "emit");
// Output the text
if (!v3Global.opt.lintOnly() && !v3Global.opt.serializeOnly()
&& !v3Global.opt.dpiHdrOnly()) {

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@ -0,0 +1,251 @@
AST patterns with depth 1
126 (CONST #A):a/a
54 (VARREF):a/b
36 (CCAST (VARREF):a/b):a/b
34 (AND (CONST #A):a/a _:a/1):a/1
29 (VARREF):a/a
23 (CONST ZERO):a/a
21 (VARREF):(w64)u[1:0]
20 (CCAST _:a/1):a/1
18 (AND (CONST #A):a/a _:a/a):a/a
18 (SHIFTR _:a/b (CONST #A):a/a):a/1
17 (VARREF):a/1
15 (SHIFTL _:a/1 (CONST #A):a/a):a/a
14 (NEGATE _:a/1):a/a
12 (AND (CONST #A):a/a _:a/b):a/b
12 (ARRAYSEL (VARREF):(w64)u[1:0] (CONST ZERO):a/a):b/b
12 (NOT _:a/b):a/b
12 (VARREF):(w64)u[0:0]
11 (OR _:a/a _:a/b):a/c
9 (OR _:a/a _:a/1):a/b
9 (VARREF):(G/str)
8 (CCAST _:a/a):a/a
8 (CCAST _:a/a):b/b
8 (CRESET):a/a
8 (NOT _:a/a):a/a
8 (REDXOR _:a/b):a/1
7 (SHIFTL _:a/b (CONST #A):a/a):a/a
6 (AND _:a/b _:a/b):a/b
6 (REDXOR _:a/a):b/1
5 (CCAST _:a/a):b/1
5 (OR _:a/a _:a/a):a/a
4 (ADD _:a/a (VARREF):a/a):a/a
4 (ARRAYSEL (VARREF):(w64)u[0:0] (CONST ZERO):a/a):b/b
4 (CCAST (CONST #A):a/a):a/a
4 (CCAST (VARREF):a/1):a/1
4 (CCAST _:a/1):b/1
4 (CONST #A):(G/str)
4 (CONST #A):a/1
4 (NEGATE _:a/1):a/b
4 (SHIFTL _:a/a (CONST #A):b/b):a/a
3 (AND (VARREF):a/a (CONST #A):b/b):a/a
3 (CONST ZERO):a/1
3 (CRESET):(w64)u[0:0]
3 (CRESET):(w64)u[1:0]
3 (NOT _:a/1):a/1
3 (OR (CONST #A):a/a _:a/a):a/a
2 (CCALL [(VARREF):(w64)u[0:0], (VARREF):(w64)u[0:0]]):a/a
2 (CCALL [(VARREF):(w64)u[0:0]]):a/1
2 (CCALL [(VARREF):(w64)u[1:0], (VARREF):(w64)u[1:0]]):a/a
2 (CCALL [(VARREF):(w64)u[1:0]]):a/1
2 (CCALL []):a/1
2 (CRESET):(G/str)
2 (GT (CONST #A):a/a (VARREF):a/a):a/1
2 (LT (CONST #A):a/a (VARREF):a/a):a/1
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2 (REDXOR (OR (SHIFTL (CCAST _:a/a):b/b (CONST #A):a/a):b/b (CCAST (CCAST _:a/a):a/a):b/b):b/b):a/1
2 (SHIFTL (OR (AND (CONST #A):a/a (SHIFTL _:a/1 (CONST #B):a/a):a/a):a/a (OR (AND (CONST #B):a/a _:a/a):a/a (AND (CONST #C):a/a _:a/1):a/1):a/b):a/c (CONST #B):a/a):a/a
2 (SHIFTL (REDXOR (AND (CONST #A):a/a (AND _:a/b _:a/b):a/b):a/b):a/1 (CONST #B):a/a):a/a
2 (SHIFTL (REDXOR (AND (CONST #A):a/a (NEGATE _:a/1):a/b):a/b):a/1 (CONST #B):a/a):a/a
2 (SHIFTL (REDXOR (AND (CONST #A):a/a (OR _:a/a _:a/a):a/b):a/b):c/1 (CONST #B):c/c):c/c
2 (SHIFTL (REDXOR (NEGATE (CCAST _:a/1):a/1):a/a):a/1 (CONST #A):a/a):a/a
2 (SHIFTL (REDXOR (NEGATE (CCAST _:a/1):b/1):b/b):a/1 (CONST #A):a/a):a/a
1 (AND (CONST #A):a/a (CCAST (SHIFTR (ARRAYSEL (VARREF):(w64)u[1:0] (CONST ZERO):a/a):b/b (CONST #A):a/a):b/b):a/1):a/1
1 (AND (CONST #A):a/a (CCAST (SHIFTR (ARRAYSEL (VARREF):(w64)u[1:0] (CONST ZERO):a/a):b/b (CONST #B):a/a):b/b):a/1):a/1
1 (AND (CONST #A):a/a (NOT (CCAST (CCALL [(VARREF):(w64)u[0:0]]):a/1):a/1):a/1):a/1
1 (AND (CONST #A):a/a (NOT (CCAST (CCALL [(VARREF):(w64)u[1:0]]):a/1):a/1):a/1):a/1
1 (CCAST (CCAST (OR (SHIFTL _:a/b (CONST #A):a/a):a/a (OR _:a/a _:a/1):a/b):a/c):a/c):d/d
1 (CCAST (OR (SHIFTL (NEQ _:a/b _:a/b):a/c (CONST #A):a/a):a/a (OR (SHIFTL _:a/1 (CONST #B):a/a):a/a (NEQ _:a/b _:a/b):a/1):a/c):a/b):a/b
1 (OR (SHIFTL (NEQ (CCAST (VARREF):a/b):a/b (CCAST (VARREF):a/b):a/b):a/1 (CONST #A):a/a):a/a (NEQ (CCAST (VARREF):a/b):a/b (CCAST (VARREF):a/b):a/b):a/1):a/c
1 (OR (SHIFTL (NEQ (CCAST (VARREF):a/b):a/b (CCAST (VARREF):a/b):a/b):a/c (CONST #A):a/a):a/a (OR (SHIFTL (NEQ _:a/b _:a/b):a/1 (CONST #B):a/a):a/a (NEQ (CCAST (VARREF):a/b):a/b (CCAST (VARREF):a/b):a/b):a/1):a/c):a/b

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#!/usr/bin/env python3
# DESCRIPTION: Verilator: Verilog Test driver/expect definition
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of either the GNU Lesser General Public License Version 3
# or the Perl Artistic License Version 2.0.
# SPDX-FileCopyrightText: 2026 Wilson Snyder
# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
import vltest_bootstrap
test.scenarios('vlt')
test.compile(verilator_flags2=["--dump-ast-patterns", "--no-skip-identical"])
test.files_identical(test.obj_dir + "/" + test.vm_prefix + "__ast_patterns_emit.txt",
test.golden_filename)
test.passes()

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// DESCRIPTION: Verilator: Verilog Test module
//
// This file ONLY is placed under the Creative Commons Public Domain.
// SPDX-FileCopyrightText: 2026 Wilson Snyder
// SPDX-License-Identifier: CC0-1.0
module t (
input wire [3:0] a,
input wire [3:0] b,
input wire [3:0] c,
output wire [10:0] o
);
wire [3:0] x = ~a & ~b;
wire [3:0] y = ~b & ~c;
wire [3:0] z = ~c & ~a;
wire [0:0] w1 = x[0];
wire [7:0] w8 = {8{x[1]}};
wire [15:0] w16 = {2{w8}};
wire [31:0] w32 = {2{w16}};
wire [63:0] w64a = {2{w32}};
wire [63:0] w64b = {2{~w32}};
wire [62:0] w63 = 63'({2{~w32}});
wire [95:0] w96 = 96'(w64a);
assign o = {^x, ^y, ^z, ^w1, ^w8, ^w16, ^w32, ^w64a, ^w64b, ^w63, ^w96};
endmodule