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Internals: Optimize updates of Vtogcov signals. No functional change intended. (#6110)

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This commit is contained in:
Ryszard Rozak
2025-08-04 13:29:56 +01:00
committed by GitHub
parent 52ac3b3a0d
commit 7d2b6bd921
22 changed files with 448 additions and 158 deletions
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src/V3EmitCImp.cpp
+47 -6
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@@ -103,7 +103,7 @@ class EmitCGatherDependencies final : VNVisitorConst {
addSelfDependency(nodep->selfPointer(), nodep->varp());
iterateChildrenConst(nodep);
}
void visit(AstCoverDecl* nodep) override {
void visit(AstNodeCoverDecl* nodep) override {
addSymsDependency();
iterateChildrenConst(nodep);
}
@@ -307,17 +307,16 @@ class EmitCImp final : EmitCFunc {
splitSizeInc(10);
}
void emitCoverageImp() {
// Rather than putting out VL_COVER_INSERT calls directly, we do it via this
// function. This gets around gcc slowness constructing all of the template
// arguments.
if (v3Global.opt.coverage()) {
puts("\n// Coverage\n");
// Rather than putting out VL_COVER_INSERT calls directly, we do it via this
// function. This gets around gcc slowness constructing all of the template
// arguments.
puts("void " + prefixNameProtect(m_modp) + "::__vlCoverInsert(");
puts(v3Global.opt.threads() > 1 ? "std::atomic<uint32_t>" : "uint32_t");
puts("* countp, bool enable, const char* filenamep, int lineno, int column,\n");
puts("const char* hierp, const char* pagep, const char* commentp, const char* "
"linescovp) "
"{\n");
"linescovp) {\n");
if (v3Global.opt.threads() > 1) {
puts("assert(sizeof(uint32_t) == sizeof(std::atomic<uint32_t>));\n");
puts("uint32_t* count32p = reinterpret_cast<uint32_t*>(countp);\n");
@@ -343,6 +342,48 @@ class EmitCImp final : EmitCFunc {
puts("}\n");
splitSizeInc(10);
}
if (v3Global.opt.coverageToggle()) {
puts("\n// Toggle Coverage\n");
puts("void " + prefixNameProtect(m_modp) + "::__vlCoverToggleInsert(");
puts("int begin, int end, bool ranged, ");
puts(v3Global.opt.threads() > 1 ? "std::atomic<uint32_t>" : "uint32_t");
puts("* countp, bool enable, const char* filenamep, int lineno, int column,\n");
puts("const char* hierp, const char* pagep, const char* commentp) {\n");
if (v3Global.opt.threads() > 1) {
puts("assert(sizeof(uint32_t) == sizeof(std::atomic<uint32_t>));\n");
}
puts("int step = (end >= begin) ? 1 : -1;\n");
// range is inclusive
puts("for (int i = begin; i != end + step; i += step) {\n");
if (v3Global.opt.threads() > 1) {
puts("uint32_t* count32p = reinterpret_cast<uint32_t*>(countp);\n");
} else {
puts("uint32_t* count32p = countp;\n");
}
// static doesn't need save-restore as is constant
puts("static uint32_t fake_zero_count = 0;\n");
puts("std::string fullhier = std::string{VerilatedModule::name()} + hierp;\n");
puts("if (!fullhier.empty() && fullhier[0] == '.') fullhier = fullhier.substr(1);\n");
puts("std::string commentWithIndex = commentp;\n");
puts("if (ranged) commentWithIndex += '[' + std::to_string(i) + ']';\n");
// Used for second++ instantiation of identical bin
puts("if (!enable) count32p = &fake_zero_count;\n");
puts("*count32p = 0;\n");
puts("VL_COVER_INSERT(vlSymsp->_vm_contextp__->coveragep(), VerilatedModule::name(), "
"count32p,");
puts(" \"filename\",filenamep,");
puts(" \"lineno\",lineno,");
puts(" \"column\",column,\n");
puts("\"hier\",fullhier,");
puts(" \"page\",pagep,");
puts(" \"comment\",commentWithIndex.c_str(),");
puts(" \"\", \"\");\n"); // linescov argument, but in toggle coverage it is always
// empty
puts("++countp;\n");
puts("}\n");
puts("}\n");
splitSizeInc(10);
}
}
void emitDestructorImp(const AstNodeModule* modp) {
puts("\n");