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Support class srandom and class random stability.

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This commit is contained in:
Wilson Snyder
2023-04-01 10:50:27 -04:00
parent 28eadded87
commit 69121633cf
21 changed files with 361 additions and 22 deletions
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src/V3Randomize.cpp
+30 -4
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@@ -188,15 +188,15 @@ private:
AstVarRef* const tabRefp
= new AstVarRef{fl, enumValueTabp(enumDtp), VAccess::READ};
tabRefp->classOrPackagep(v3Global.rootp()->dollarUnitPkgAddp());
AstRand* const randp = new AstRand{fl, nullptr, false};
AstRandRNG* const randp
= new AstRandRNG{fl, varrefp->findBasicDType(VBasicDTypeKwd::UINT32)};
AstNodeExpr* const moddivp = new AstModDiv{
fl, randp, new AstConst{fl, static_cast<uint32_t>(enumDtp->itemCount())}};
randp->dtypep(varrefp->findBasicDType(VBasicDTypeKwd::UINT32));
moddivp->dtypep(enumDtp);
valp = new AstArraySel{fl, tabRefp, moddivp};
} else {
valp = new AstRand{fl, nullptr, false};
valp->dtypep(memberp ? memberp->dtypep() : varrefp->varp()->dtypep());
valp = new AstRandRNG{fl,
(memberp ? memberp->dtypep() : varrefp->varp()->dtypep())};
}
return new AstAssign{fl,
new AstSel{fl, varrefp, offset + (memberp ? memberp->lsb() : 0),
@@ -374,6 +374,7 @@ void V3Randomize::randomizeNetlist(AstNetlist* nodep) {
AstFunc* V3Randomize::newRandomizeFunc(AstClass* nodep) {
AstFunc* funcp = VN_AS(nodep->findMember("randomize"), Func);
if (!funcp) {
v3Global.useRandomizeMethods(true);
AstNodeDType* const dtypep
= nodep->findBitDType(32, 32, VSigning::SIGNED); // IEEE says int return of 0/1
AstVar* const fvarp = new AstVar{nodep->fileline(), VVarType::MEMBER, "randomize", dtypep};
@@ -387,6 +388,31 @@ AstFunc* V3Randomize::newRandomizeFunc(AstClass* nodep) {
funcp->isVirtual(nodep->isExtended());
nodep->addMembersp(funcp);
nodep->repairCache();
AstClass* const basep = nodep->baseMostClassp();
basep->needRNG(true);
}
return funcp;
}
AstFunc* V3Randomize::newSRandomFunc(AstClass* nodep) {
AstClass* const basep = nodep->baseMostClassp();
AstFunc* funcp = VN_AS(basep->findMember("srandom"), Func);
if (!funcp) {
v3Global.useRandomizeMethods(true);
AstNodeDType* const dtypep
= basep->findBitDType(32, 32, VSigning::SIGNED); // IEEE says argument 0/1
AstVar* const ivarp = new AstVar{basep->fileline(), VVarType::MEMBER, "seed", dtypep};
ivarp->lifetime(VLifetime::AUTOMATIC);
ivarp->funcLocal(true);
ivarp->direction(VDirection::INPUT);
funcp = new AstFunc{basep->fileline(), "srandom", ivarp, nullptr};
funcp->dtypep(basep->findVoidDType());
funcp->classMethod(true);
funcp->isVirtual(false);
basep->addMembersp(funcp);
basep->repairCache();
funcp->addStmtsp(new AstCStmt{basep->fileline(), "__Vm_rng.srandom(seed);\n"});
basep->needRNG(true);
}
return funcp;
}