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Optimize Dfg only once, after V3Scope (#7362)

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This commit is contained in:
Geza Lore
2026-04-09 08:31:12 -04:00
committed by GitHub
parent e63c4f563e
commit 9f9532ff78
54 changed files with 752 additions and 1399 deletions
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src/Verilator.cpp
+9 -23
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@@ -307,15 +307,8 @@ static void process() {
v3Global.constRemoveXs(true);
}
if (v3Global.opt.fDfgPreInline() || v3Global.opt.fDfgPostInline()) {
// If doing DFG optimization, extract some additional candidates
V3DfgOptimizer::extract(v3Global.rootp());
}
if (v3Global.opt.fDfgPreInline()) {
// Pre inline DFG optimization
V3DfgOptimizer::optimize(v3Global.rootp(), "pre inline");
}
// If doing DFG optimization, extract some additional candidates
if (v3Global.opt.fDfg()) V3DfgOptimizer::extract(v3Global.rootp());
if (!(v3Global.opt.serializeOnly() && !v3Global.opt.flatten())) {
// Module inlining
@@ -329,15 +322,10 @@ static void process() {
if (v3Global.opt.trace()) V3Interface::interfaceAll(v3Global.rootp());
if (v3Global.opt.fDfgPostInline()) {
// Post inline DFG optimization
V3DfgOptimizer::optimize(v3Global.rootp(), "post inline");
}
// --PRE-FLAT OPTIMIZATIONS------------------
// Initial const/dead to reduce work for ordering code
V3Const::constifyAll(v3Global.rootp());
if (v3Global.opt.fConstBeforeDfg()) V3Const::constifyAll(v3Global.rootp());
v3Global.checkTree();
V3Dead::deadifyDTypes(v3Global.rootp());
@@ -355,7 +343,7 @@ static void process() {
V3Inst::instAll(v3Global.rootp());
// Inst may have made lots of concats; fix them
V3Const::constifyAll(v3Global.rootp());
if (v3Global.opt.fConstBeforeDfg()) V3Const::constifyAll(v3Global.rootp());
// Flatten hierarchy, creating a SCOPE for each module's usage as a cell
// No more AstAlias after linkDotScope
@@ -370,7 +358,7 @@ static void process() {
if (!(v3Global.opt.serializeOnly() && !v3Global.opt.flatten())) {
// Cleanup
V3Const::constifyAll(v3Global.rootp());
if (v3Global.opt.fConstBeforeDfg()) V3Const::constifyAll(v3Global.rootp());
V3Dead::deadifyDTypesScoped(v3Global.rootp());
v3Global.checkTree();
}
@@ -398,7 +386,7 @@ static void process() {
V3Slice::sliceAll(v3Global.rootp());
// Push constants across variables and remove redundant assignments
V3Const::constifyAll(v3Global.rootp());
if (v3Global.opt.fConstBeforeDfg()) V3Const::constifyAll(v3Global.rootp());
if (v3Global.opt.fLife()) V3Life::lifeAll(v3Global.rootp());
@@ -409,7 +397,7 @@ static void process() {
}
// Cleanup
V3Const::constifyAll(v3Global.rootp());
if (v3Global.opt.fConstBeforeDfg()) V3Const::constifyAll(v3Global.rootp());
V3Dead::deadifyDTypesScoped(v3Global.rootp());
v3Global.checkTree();
@@ -429,10 +417,8 @@ static void process() {
// forcing.
V3Force::forceAll(v3Global.rootp());
if (v3Global.opt.fDfgScoped()) {
// Scoped DFG optimization
V3DfgOptimizer::optimize(v3Global.rootp(), "scoped");
}
// DFG optimization
if (v3Global.opt.fDfg()) V3DfgOptimizer::optimize(v3Global.rootp());
// Gate-based logic elimination; eliminate signals and push constant across cell
// boundaries Instant propagation makes lots-o-constant reduction possibilities.