Improve V3Combine
- Always use a fast function to replace a slow one if available - Iterate to fixed point (i.e.: if combining made more functions identical, combine those too). This will be more useful in the future. - Use only single, const traversal
This commit is contained in:
Geza Lore
parent
665fa140a8
commit
5b9806ae6d
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@ -2877,6 +2877,7 @@ public:
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virtual bool isPure() const override;
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virtual bool isOutputter() const override { return !isPure(); }
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AstCFunc* funcp() const { return m_funcp; }
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void funcp(AstCFunc* funcp) { m_funcp = funcp; }
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void argTypes(const string& str) { m_argTypes = str; }
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string argTypes() const { return m_argTypes; }
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// op1p reserved for AstCMethodCall
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@ -8956,7 +8956,7 @@ public:
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AstScope* scopep() const { return m_scopep; }
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void scopep(AstScope* nodep) { m_scopep = nodep; }
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string rtnTypeVoid() const { return ((m_rtnType == "") ? "void" : m_rtnType); }
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bool dontCombine() const { return m_dontCombine || isTrace(); }
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bool dontCombine() const { return m_dontCombine || isTrace() || entryPoint(); }
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void dontCombine(bool flag) { m_dontCombine = flag; }
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bool dontInline() const { return dontCombine() || slow() || funcPublic(); }
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bool declPrivate() const { return m_declPrivate; }
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@ -27,193 +27,203 @@
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#include "V3DupFinder.h"
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#include "V3Stats.h"
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#include "V3Ast.h"
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#include "V3AstUserAllocator.h"
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#include <algorithm>
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#include <map>
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#include <list>
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#include <vector>
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//######################################################################
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class CombBaseVisitor VL_NOT_FINAL : public VNVisitor {
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protected:
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// STATE
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// METHODS
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virtual ~CombBaseVisitor() override = default;
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VL_DEBUG_FUNC; // Declare debug()
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};
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//######################################################################
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// Combine replacement function
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class CombCallVisitor final : CombBaseVisitor {
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// Find all CCALLS of each CFUNC, so that we can later rename them
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private:
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class CombineVisitor final : VNVisitor {
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// NODE STATE
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std::multimap<AstCFunc*, AstCCall*> m_callMmap; // Associative array of {function}{call}
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// METHODS
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public:
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void replaceFunc(AstCFunc* oldfuncp, AstCFunc* newfuncp) {
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if (oldfuncp == newfuncp) return;
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if (newfuncp) {
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UINFO(4, " Replace " << oldfuncp << " -WITH-> " << newfuncp << endl);
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} else {
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UINFO(4, " Remove " << oldfuncp << endl);
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}
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// Note: m_callMmap modified in loop, so not using equal_range.
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for (auto it = m_callMmap.find(oldfuncp); it != m_callMmap.end();
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it = m_callMmap.find(oldfuncp)) {
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AstCCall* const oldp = it->second;
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UINFO(4, " Called " << oldp << endl);
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UASSERT_OBJ(oldp->funcp() == oldfuncp, oldp,
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"Call list broken, points to call w/different func");
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if (newfuncp) {
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// Replace call to oldfuncp with call to newfuncp
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AstNode* const argsp
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= oldp->argsp() ? oldp->argsp()->unlinkFrBackWithNext() : nullptr;
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AstCCall* const newp = new AstCCall(oldp->fileline(), newfuncp, argsp);
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newp->selfPointer(oldp->selfPointer());
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newp->argTypes(oldp->argTypes());
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addCall(newp); // Fix the table, in case the newfuncp itself gets replaced
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oldp->replaceWith(newp);
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} else {
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// Just deleting empty function
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oldp->unlinkFrBack();
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}
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VL_DO_DANGLING(pushDeletep(oldp), oldp);
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m_callMmap.erase(it); // Fix the table, This call has been replaced
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}
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}
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// METHODS
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void addCall(AstCCall* nodep) { m_callMmap.emplace(nodep->funcp(), nodep); }
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// AstNodeModule::user1() List of AstCFuncs in this module (via m_cfuncs)
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// AstCFunc::user1() List of AstCCalls to this function (via m_callSites)
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// AstCFunc::user2() bool: Already replaced (in 'process')
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// AstCFunc::user3() bool: Marks functions earlier in iteration order (in 'combinePass')
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// *::user4() Used by V3Hasher
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const VNUser1InUse m_user1InUse;
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private:
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// VISITORS
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virtual void visit(AstCCall* nodep) override {
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if (nodep->funcp()->dontCombine()) return;
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addCall(nodep);
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}
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// LCOV_EXCL_START
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virtual void visit(AstAddrOfCFunc* nodep) override {
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// We cannot yet handle references via AstAddrOfCFunc, but currently those are
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// only used in tracing functions, which are not combined. Blow up in case this changes.
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if (nodep->funcp()->dontCombine()) return;
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nodep->v3fatalSrc(
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"Don't know how to combine functions that are referenced via AstAddrOfCFunc");
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}
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// LCOV_EXCL_END
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virtual void visit(AstNode* nodep) override { iterateChildren(nodep); }
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public:
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// CONSTRUCTORS
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CombCallVisitor() = default;
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virtual ~CombCallVisitor() override = default;
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void main(AstNetlist* nodep) { iterate(nodep); }
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};
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//######################################################################
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// Combine state, as a visitor of each AstNode
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class CombineVisitor final : CombBaseVisitor {
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private:
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// NODE STATE
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// Entire netlist:
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const VNUser3InUse m_user3InUse; // Marks replaced AstCFuncs
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// VNUser4InUse part of V3Hasher in V3DupFinder
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// TYPES
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using funcit_t = std::list<AstCFunc*>::iterator;
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struct CFuncs {
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std::list<AstCFunc*> m_fast;
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std::list<AstCFunc*> m_slow;
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};
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// STATE
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AstUser1Allocator<AstNodeModule, CFuncs> m_cfuncs; // AstCFuncs under module
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AstUser1Allocator<AstCFunc, std::vector<AstCCall*>> m_callSites; // Call sites of the AstCFunc
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AstNodeModule* m_modp = nullptr; // Current module
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const V3Hasher m_hasher; // For hashing
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VDouble0 m_cfuncsCombined; // Statistic tracking
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CombCallVisitor m_call; // Tracking of function call users
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V3DupFinder m_dupFinder; // Duplicate finder for CFuncs in module
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// METHODS
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void walkEmptyFuncs() {
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for (const auto& itr : m_dupFinder) {
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AstCFunc* const oldfuncp = VN_AS(itr.second, CFunc);
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UASSERT_OBJ(oldfuncp, itr.second, "Not a CFunc in hash");
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if (!oldfuncp->emptyBody()) continue;
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UASSERT_OBJ(!oldfuncp->dontCombine(), oldfuncp,
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"dontCombine function should not be in hash");
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VL_DEBUG_FUNC; // Declare debug()
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// Remove calls to empty function
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UASSERT_OBJ(!oldfuncp->user3(), oldfuncp, "Should not be processed yet");
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UINFO(5, " Drop empty CFunc " << itr.first << " " << oldfuncp << endl);
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oldfuncp->user3SetOnce(); // Mark replaced
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m_call.replaceFunc(oldfuncp, nullptr);
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oldfuncp->unlinkFrBack();
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VL_DO_DANGLING(pushDeletep(oldfuncp), oldfuncp);
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void removeEmptyFunctions(std::list<AstCFunc*>& funcps) {
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for (funcit_t it = funcps.begin(), nit; it != funcps.end(); it = nit) {
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AstCFunc* const funcp = *it;
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nit = it;
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++nit;
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if (funcp->emptyBody()) {
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// Delete call sites
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for (AstCCall* const callp : m_callSites(funcp)) {
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VL_DO_DANGLING(callp->unlinkFrBack()->deleteTree(), callp);
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}
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m_callSites(funcp).clear();
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// Remove from list
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funcps.erase(it);
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// Delete function
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VL_DO_DANGLING(funcp->unlinkFrBack()->deleteTree(), funcp);
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}
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}
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}
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void walkDupFuncs() {
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// Do non-slow first as then favors naming functions based on fast name
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for (const bool slow : {false, true}) {
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for (auto newIt = m_dupFinder.begin(); newIt != m_dupFinder.end(); ++newIt) {
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AstCFunc* const newfuncp = VN_AS(newIt->second, CFunc);
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UASSERT_OBJ(newfuncp, newIt->second, "Not a CFunc in hash");
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if (newfuncp->user3()) continue; // Already replaced
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if (newfuncp->slow() != slow) continue;
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auto oldIt = newIt;
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++oldIt; // Skip over current position
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for (; oldIt != m_dupFinder.end(); ++oldIt) {
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AstCFunc* const oldfuncp = VN_AS(oldIt->second, CFunc);
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UASSERT_OBJ(oldfuncp, oldIt->second, "Not a CFunc in hash");
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UASSERT_OBJ(newfuncp != oldfuncp, newfuncp,
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"Same function hashed multiple times");
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if (newIt->first != oldIt->first) break; // Iterate over same hashes only
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if (oldfuncp->user3()) continue; // Already replaced
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if (!newfuncp->sameTree(oldfuncp)) continue; // Different functions
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// One pass of combining. Returns true if did replacement.
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bool combinePass(std::list<AstCFunc*>& funcps, V3DupFinder& dupFinder) {
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const VNUser3InUse user3InUse;
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// Replace calls to oldfuncp with calls to newfuncp
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UINFO(5, " Replace CFunc " << newIt->first << " " << newfuncp << endl);
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UINFO(5, " with " << oldIt->first << " " << oldfuncp << endl);
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++m_cfuncsCombined;
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oldfuncp->user3SetOnce(); // Mark replaced
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m_call.replaceFunc(oldfuncp, newfuncp);
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oldfuncp->unlinkFrBack();
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// Replacement may promote a slow routine to fast path
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if (!oldfuncp->slow()) newfuncp->slow(false);
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VL_DO_DANGLING(pushDeletep(oldfuncp), oldfuncp);
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bool replaced = false;
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// Replace all identical functions with the first function in the list
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for (funcit_t it = funcps.begin(), nit; it != funcps.end(); it = nit) {
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AstCFunc* const funcp = *it;
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nit = it;
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++nit;
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// Remove functions already replaced in the previous iteration
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if (funcp->user2()) {
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funcps.erase(it);
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VL_DO_DANGLING(funcp->unlinkFrBack()->deleteTree(), funcp);
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continue;
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}
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while (true) {
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auto dit = dupFinder.findDuplicate(funcp);
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if (dit == dupFinder.end()) break;
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AstCFunc* oldp = VN_AS(dit->second, CFunc);
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AstCFunc* newp = funcp;
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UASSERT_OBJ(!oldp->user2(), oldp, "Should have been removed from dupFinder");
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// Swap them, if the duplicate is earlier in the list of functions. This is
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// necessary because replacing a call site in a later function might have made that
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// function equivalent to an earlier function, but we want the first equivalent
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// function in the list to be the canonical one.
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if (oldp->user3()) std::swap(oldp, newp);
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// Something is being replaced
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UINFO(9, "Replacing " << oldp << endl);
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UINFO(9, " with " << newp << endl);
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++m_cfuncsCombined;
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replaced = true;
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// Mark as replaced
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oldp->user2(true);
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// Redirect the calls
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for (AstCCall* const callp : m_callSites(oldp)) {
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// For sanity check only
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const V3Hash oldHash = m_hasher(callp);
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// Redirect the call
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callp->funcp(newp);
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// When redirecting a call to an equivalent function, we do not need to re-hash
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// the caller, because the hash of the two calls must be the same, and hence
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// the hash of the caller should not change.
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UASSERT_OBJ(oldHash == m_hasher.rehash(callp), callp, "Hash changed");
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}
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// Erase the replaced duplicate
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UASSERT_OBJ(dupFinder.erase(oldp) == 1, oldp, "Replaced node not in dupFinder");
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// If we just replaced the function we are iterating (because there was an
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// equivalent earlier in the list), then move on, as this is on longer a candidate
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if (oldp == funcp) break;
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}
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// Mark as function earlier in list of functions.
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funcp->user3(true);
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}
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return replaced;
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}
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void process(AstNetlist* netlistp) {
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// First, remove empty functions. We need to do this separately, because removing
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// calls can change the hashes of the callers.
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for (AstNodeModule* modulep = netlistp->modulesp(); modulep;
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modulep = VN_AS(modulep->nextp(), NodeModule)) {
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removeEmptyFunctions(m_cfuncs(modulep).m_fast);
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removeEmptyFunctions(m_cfuncs(modulep).m_slow);
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}
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// Combine functions within each module
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for (AstNodeModule* modulep = netlistp->modulesp(); modulep;
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modulep = VN_AS(modulep->nextp(), NodeModule)) {
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// Put fast functions first, so they are preferred over slow functions
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auto funcps = std::move(m_cfuncs(modulep).m_fast);
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funcps.splice(funcps.end(), m_cfuncs(modulep).m_slow);
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V3DupFinder dupFinder{m_hasher};
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// First, hash all functions
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for (AstCFunc* const funcp : funcps) dupFinder.insert(funcp);
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// Iterate to fixed point
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{
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const VNUser2InUse user2InUse;
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while (combinePass(funcps, dupFinder)) {}
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}
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}
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}
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// VISITORS
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virtual void visit(AstNetlist* nodep) override {
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m_call.main(nodep); // Track all call sites of each function
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iterateChildren(nodep);
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// Gather functions and references
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iterateChildrenConst(nodep);
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// Combine functions
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process(nodep);
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}
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virtual void visit(AstNodeModule* nodep) override {
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UINFO(4, " MOD " << nodep << endl);
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m_dupFinder.clear();
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// Compute hash of all CFuncs in the module
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iterateChildren(nodep);
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if (debug() >= 9) m_dupFinder.dumpFilePrefixed("combine");
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// Walk the hashes removing empty functions
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walkEmptyFuncs();
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// Walk the hashes looking for duplicate functions
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walkDupFuncs();
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UASSERT_OBJ(!m_modp, nodep, "Should not nest");
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m_modp = nodep;
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iterateChildrenConst(nodep);
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m_modp = nullptr;
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}
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virtual void visit(AstCFunc* nodep) override {
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iterateChildrenConst(nodep);
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if (nodep->dontCombine()) return;
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// Hash the entire function
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m_dupFinder.insert(nodep);
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auto& coll = nodep->slow() ? m_cfuncs(m_modp).m_slow : m_cfuncs(m_modp).m_fast;
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coll.emplace_back(nodep);
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}
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virtual void visit(AstCCall* nodep) override {
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iterateChildrenConst(nodep);
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AstCFunc* const funcp = nodep->funcp();
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if (funcp->dontCombine()) return;
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m_callSites(funcp).emplace_back(nodep);
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}
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virtual void visit(AstAddrOfCFunc* nodep) override {
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iterateChildrenConst(nodep);
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if (nodep->funcp()->dontCombine()) return;
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// LCOV_EXCL_START
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// We cannot yet handle references via AstAddrOfCFunc, but currently those are
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// only used in tracing functions, which are not combined. Blow up in case this changes.
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nodep->v3fatalSrc(
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"Don't know how to combine functions that are referenced via AstAddrOfCFunc");
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// LCOV_EXCL_END
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}
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//--------------------
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// Default: Just iterate
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virtual void visit(AstVar*) override {} // Accelerate
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virtual void visit(AstNodeStmt* nodep) override {} // Accelerate
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virtual void visit(AstNode* nodep) override { iterateChildren(nodep); }
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virtual void visit(AstNode* nodep) override { iterateChildrenConst(nodep); }
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public:
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// CONSTRUCTORS
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explicit CombineVisitor(AstNetlist* nodep) { iterate(nodep); }
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virtual ~CombineVisitor() override {
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V3Stats::addStat("Optimizations, Combined CFuncs", m_cfuncsCombined);
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}
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~CombineVisitor() { V3Stats::addStat("Optimizations, Combined CFuncs", m_cfuncsCombined); }
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public:
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static void apply(AstNetlist* netlistp) { CombineVisitor{netlistp}; }
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};
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//######################################################################
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@ -221,6 +231,6 @@ public:
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void V3Combine::combineAll(AstNetlist* nodep) {
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UINFO(2, __FUNCTION__ << ": " << endl);
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{ CombineVisitor{nodep}; } // Destruct before checking
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CombineVisitor::apply(nodep);
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V3Global::dumpCheckGlobalTree("combine", 0, v3Global.opt.dumpTreeLevel(__FILE__) >= 3);
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}
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@ -30,6 +30,17 @@
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//######################################################################
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// V3DupFinder class functions
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V3DupFinder::size_type V3DupFinder::erase(AstNode* nodep) {
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const auto& er = equal_range(m_hasher(nodep));
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for (iterator it = er.first; it != er.second; ++it) {
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if (nodep == it->second) {
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erase(it);
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return 1;
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}
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}
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return 0;
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}
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V3DupFinder::iterator V3DupFinder::findDuplicate(AstNode* nodep, V3DupFinderUserSame* checkp) {
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const auto& er = equal_range(m_hasher(nodep));
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for (iterator it = er.first; it != er.second; ++it) {
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@ -37,7 +48,7 @@ V3DupFinder::iterator V3DupFinder::findDuplicate(AstNode* nodep, V3DupFinderUser
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if (nodep == node2p) continue; // Same node is not a duplicate
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if (checkp && !checkp->isSame(nodep, node2p)) continue; // User says it is not a duplicate
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if (!nodep->sameTree(node2p)) continue; // Not the same trees
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// Found duplicate!
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// Found duplicate
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return it;
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}
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return end();
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@ -28,6 +28,7 @@
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#include "V3Hasher.h"
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||||
|
||||
#include <map>
|
||||
#include <memory>
|
||||
|
||||
//============================================================================
|
||||
|
||||
|
|
@ -43,12 +44,20 @@ class V3DupFinder final : private std::multimap<V3Hash, AstNode*> {
|
|||
using Super = std::multimap<V3Hash, AstNode*>;
|
||||
|
||||
// MEMBERS
|
||||
const V3Hasher m_hasher;
|
||||
const V3Hasher* const m_hasherp; // Pointer to owned hasher
|
||||
const V3Hasher& m_hasher; // Reference to hasher
|
||||
|
||||
public:
|
||||
// CONSTRUCTORS
|
||||
V3DupFinder(){};
|
||||
~V3DupFinder() = default;
|
||||
V3DupFinder()
|
||||
: m_hasherp{new V3Hasher}
|
||||
, m_hasher{*m_hasherp} {}
|
||||
V3DupFinder(const V3Hasher& hasher)
|
||||
: m_hasherp{nullptr}
|
||||
, m_hasher{hasher} {}
|
||||
~V3DupFinder() {
|
||||
if (m_hasherp) delete m_hasherp;
|
||||
}
|
||||
|
||||
// METHODS
|
||||
VL_DEBUG_FUNC; // Declare debug()
|
||||
|
|
@ -63,10 +72,14 @@ public:
|
|||
using Super::end;
|
||||
using Super::erase;
|
||||
using Super::iterator;
|
||||
using Super::size_type;
|
||||
|
||||
// Insert node into data structure
|
||||
iterator insert(AstNode* nodep) { return emplace(m_hasher(nodep), nodep); }
|
||||
|
||||
// Erase node from data structure
|
||||
size_type erase(AstNode* nodep);
|
||||
|
||||
// Return duplicate, if one was inserted, with optional user check for sameness
|
||||
iterator findDuplicate(AstNode* nodep, V3DupFinderUserSame* checkp = nullptr);
|
||||
|
||||
|
|
|
|||
|
|
@ -516,6 +516,12 @@ V3Hash V3Hasher::operator()(AstNode* nodep) const {
|
|||
return V3Hash(nodep->user4());
|
||||
}
|
||||
|
||||
V3Hash V3Hasher::rehash(AstNode* nodep) const {
|
||||
nodep->user4(0);
|
||||
HasherVisitor{nodep};
|
||||
return V3Hash(nodep->user4());
|
||||
}
|
||||
|
||||
V3Hash V3Hasher::uncachedHash(const AstNode* nodep) {
|
||||
const HasherVisitor visitor{nodep, HasherVisitor::Uncached{}};
|
||||
return visitor.finalHash();
|
||||
|
|
|
|||
|
|
@ -45,6 +45,9 @@ public:
|
|||
// Compute hash of node. This method caches the hash in the node's user4().
|
||||
V3Hash operator()(AstNode* nodep) const;
|
||||
|
||||
// Re-compute hash of this node, discarding cached value, but used cached hash of children.
|
||||
V3Hash rehash(AstNode* nodep) const;
|
||||
|
||||
// Compute hash of node, without caching in user4.
|
||||
static V3Hash uncachedHash(const AstNode* nodep);
|
||||
};
|
||||
|
|
|
|||
Loading…
Reference in New Issue