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Optimize DPI import argument passing (#7704)

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Pass inputs to DPI import wrappers by reference (unless fits in a
register). This eliminates a lot of temporary constructors/destructors.
This commit is contained in:
Geza Lore
2026-06-03 08:41:33 +01:00
committed by GitHub
parent 7664bbb3ef
commit 0026a73ca0
1 changed files with 7 additions and 0 deletions
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src/V3Task.cpp
+7
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@@ -1405,6 +1405,13 @@ class TaskVisitor final : public VNVisitor {
unlinkAndClone(nodep, portp, false);
portp->funcLocal(true);
cfuncp->addArgsp(portp);
// Pass inputs to DPI import wrappers by reference, unless fits in register
if (cfuncp->dpiImportWrapper() && portp->isReadOnly()) {
AstNodeDType* const dtypep = portp->dtypep()->skipRefp();
if (dtypep->isCompound() || dtypep->isWide()) {
portp->direction(VDirection::CONSTREF);
}
}
} else {
// "Normal" variable, mark inside function
portp->funcLocal(true);