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Optimize temporary insertion in DfgPeephole

This commit is contained in:
Geza Lore 2026-04-15 13:46:45 +01:00
parent 93d7d9c417
commit ffd2c5c69e
1 changed files with 5 additions and 3 deletions
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8
src/V3DfgPeephole.cpp
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@ -208,6 +208,9 @@ class V3DfgPeephole final : public DfgVisitor {
size_t m_currentGeneration = 0; // Current generation number size_t m_currentGeneration = 0; // Current generation number
size_t m_lastId = 0; // Last unique vertex ID assigned size_t m_lastId = 0; // Last unique vertex ID assigned
size_t m_nTemps = 0; // Number of temporary variables created size_t m_nTemps = 0; // Number of temporary variables created
// Scope for transient temporariy variables cerated in this pass. They should all be
// eliminated wihtin this pass, so anything should be ok, pick the top scope as easy to find.
AstScope* const m_tmpScopep = v3Global.rootp()->topScopep()->scopep();
// STATIC STATE // STATIC STATE
static V3DebugBisect s_debugBisect; // Debug aid static V3DebugBisect s_debugBisect; // Debug aid
@ -1847,10 +1850,9 @@ class V3DfgPeephole final : public DfgVisitor {
DfgSplicePacked* const sp = new DfgSplicePacked{m_dfg, flp, vtxp->dtype()}; DfgSplicePacked* const sp = new DfgSplicePacked{m_dfg, flp, vtxp->dtype()};
m_vInfo[sp].m_id = ++m_lastId; m_vInfo[sp].m_id = ++m_lastId;
sp->addDriver(catp, lsb, flp); sp->addDriver(catp, lsb, flp);
DfgVertex::ScopeCache scopeCache;
AstScope* const scopep = vtxp->scopep(scopeCache, true);
const std::string name = m_dfg.makeUniqueName("PeepholeNarrow", m_nTemps++); const std::string name = m_dfg.makeUniqueName("PeepholeNarrow", m_nTemps++);
DfgVertexVar* const varp = m_dfg.makeNewVar(flp, name, vtxp->dtype(), scopep); DfgVertexVar* const varp
= m_dfg.makeNewVar(flp, name, vtxp->dtype(), m_tmpScopep);
varp->tmpForp(varp->vscp()); varp->tmpForp(varp->vscp());
m_vInfo[varp].m_id = ++m_lastId; m_vInfo[varp].m_id = ++m_lastId;
varp->vscp()->varp()->isInternal(true); varp->vscp()->varp()->isInternal(true);