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Improve hierarchical DPI wrapper scheduling performance (#2583) (#5734)

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This commit is contained in:
Bartłomiej Chmiel
2025-01-20 14:24:09 -05:00
committed by GitHub
parent f4a01eb452
commit 0507fb4655
12 changed files with 456 additions and 9 deletions
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src/V3ProtectLib.cpp
+30
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@@ -19,6 +19,7 @@
#include "V3ProtectLib.h"
#include "V3Hasher.h"
#include "V3InstrCount.h"
#include "V3String.h"
#include "V3Task.h"
@@ -98,6 +99,32 @@ class ProtectVisitor final : public VNVisitor {
txtp->addNodesp(new AstComment{fl, comment});
}
void configSection(AstNodeModule* modp, AstTextBlock* txtp, FileLine* fl) {
txtp->addText(fl, "\n`ifdef VERILATOR\n");
txtp->addText(fl, "`verilator_config\n");
// The `eval` function is called inside both update functions. As those functions
// are created by text bashing, we need to find cost of `_eval` which is the first function
// with a real cost in AST.
uint32_t cost = 0;
modp->foreach([&cost](AstCFunc* cfuncp) {
if (cfuncp->name() == "_eval") cost = V3InstrCount::count(cfuncp, false);
});
txtp->addText(fl, "profile_data -hier-dpi \"" + m_libName
+ "_protectlib_combo_update\" -cost 64'd" + std::to_string(cost)
+ "\n");
txtp->addText(fl, "profile_data -hier-dpi \"" + m_libName
+ "_protectlib_seq_update\" -cost 64'd" + std::to_string(cost)
+ "\n");
// Mark remaining NDA protectlib wrapper DPIs as non-hazardous by deliberately forwarding
// them with non-zero cost.
txtp->addText(fl, "profile_data -hier-dpi \"" + m_libName
+ "_protectlib_combo_ignore\" -cost 64'd1\n");
txtp->addText(fl, "`verilog\n");
txtp->addText(fl, "`endif\n");
}
void hashComment(AstTextBlock* txtp, FileLine* fl) {
addComment(txtp, fl, "Checks to make sure the .sv wrapper and library agree");
}
@@ -283,6 +310,9 @@ class ProtectVisitor final : public VNVisitor {
txtp->addText(fl, "final " + m_libName + "_protectlib_final(handle__V);\n\n");
txtp->addText(fl, "endmodule\n");
configSection(modp, txtp, fl);
m_vfilep->tblockp(txtp);
}