luke/verilator
1
0
Fork 0
mirror of https://github.com/verilator/verilator.git synced 2026-09-08 02:28:43 +02:00
Code Issues Packages Projects Releases Wiki Activity

Support basic constrained queue randomization (#5413)

Browse Source 
Signed-off-by: Arkadiusz Kozdra <[email protected]>
This commit is contained in:
Arkadiusz Kozdra
2024-09-10 09:33:14 -04:00
committed by GitHub
parent ef259f63ca
commit 4a58997604
6 changed files with 190 additions and 40 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/V3Randomize.cpp
+20 -12
View File
@@ -595,8 +595,11 @@ class ConstraintExprVisitor final : public VNVisitor {
= new AstVarRef{varp->fileline(), classp, varp, VAccess::WRITE};
varRefp->classOrPackagep(classOrPackagep);
methodp->addPinsp(varRefp);
methodp->addPinsp(new AstConst{varp->dtypep()->fileline(), AstConst::Unsized64{},
(size_t)varp->width()});
size_t width = varp->width();
if (VN_IS(varp->dtypep(), DynArrayDType) || VN_IS(varp->dtypep(), QueueDType))
width = varp->dtypep()->subDTypep()->width();
methodp->addPinsp(
new AstConst{varp->dtypep()->fileline(), AstConst::Unsized64{}, width});
AstNodeExpr* const varnamep
= new AstCExpr{varp->fileline(), "\"" + smtName + "\"", varp->width()};
varnamep->dtypep(varp->dtypep());
@@ -744,18 +747,23 @@ class ConstraintExprVisitor final : public VNVisitor {
void visit(AstCMethodHard* nodep) override {
if (editFormat(nodep)) return;
UASSERT_OBJ(nodep->name() == "size", nodep, "Non-size method call in constraints");
if (nodep->name() == "at" && nodep->fromp()->user1()) {
iterateChildren(nodep);
AstNodeExpr* const argsp
= AstNode::addNext(nodep->fromp()->unlinkFrBack(), nodep->pinsp()->unlinkFrBack());
AstSFormatF* const newp
= new AstSFormatF{nodep->fileline(), "(select %@ %@)", false, argsp};
nodep->replaceWith(newp);
VL_DO_DANGLING(nodep->deleteTree(), nodep);
return;
}
AstNode* fromp = nodep->fromp();
// Warn early while the dtype is still there
fromp->v3warn(E_UNSUPPORTED, "Unsupported: random member variable with type "
<< fromp->dtypep()->prettyDTypeNameQ());
nodep->v3warn(CONSTRAINTIGN,
"Unsupported: randomizing this expression, treating as state");
nodep->user1(false);
iterateChildren(nodep); // Might change fromp
fromp = nodep->fromp()->unlinkFrBack();
fromp->dtypep(nodep->dtypep());
nodep->replaceWith(fromp);
VL_DO_DANGLING(pushDeletep(nodep), nodep);
if (editFormat(nodep)) return;
nodep->v3fatalSrc("Method not handled in constraints? " << nodep);
}
void visit(AstNodeExpr* nodep) override {
if (editFormat(nodep)) return;