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Fix little endian interface pin swizzling (#2475).

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This commit is contained in:
Wilson Snyder
2021-02-20 22:11:20 -05:00
parent 191f76dd90
commit fd6edd90bc
4 changed files with 113 additions and 7 deletions
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src/V3Inst.cpp
+9 -4
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@@ -396,7 +396,8 @@ private:
AstNode* prevPinp = nullptr;
// Clone the var referenced by the pin, and clone each var referenced by the varref
// Clone pin varp:
for (int i = pinArrp->lo(); i <= pinArrp->hi(); ++i) {
for (int in = 0; in < pinArrp->elementsConst(); ++in) {
int i = pinArrp->left() + in * pinArrp->declRange().leftToRightInc();
string varNewName = pinVarp->name() + "__BRA__" + cvtToStr(i) + "__KET__";
AstVar* varNewp = nullptr;
@@ -429,16 +430,20 @@ private:
newp->modVarp(varNewp);
newp->name(newp->name() + "__BRA__" + cvtToStr(i) + "__KET__");
// And replace exprp with a new varxref
int offset = 0;
const AstVarRef* varrefp = VN_CAST(newp->exprp(), VarRef);
int offset = 0;
if (varrefp) {
} else if (AstSliceSel* slicep = VN_CAST(newp->exprp(), SliceSel)) {
varrefp = VN_CAST(slicep->fromp(), VarRef);
UASSERT(VN_IS(slicep->rhsp(), Const), "Slices should be constant");
offset = VN_CAST(slicep->rhsp(), Const)->toSInt();
}
if (!varrefp) { newp->exprp()->v3error("Unexpected connection to arrayed port"); }
string newname = varrefp->name() + "__BRA__" + cvtToStr(i + offset) + "__KET__";
int expr_i = i;
if (auto* exprArrp = VN_CAST(newp->exprp()->dtypep(), UnpackArrayDType))
expr_i = exprArrp->left()
+ (in + offset) * exprArrp->declRange().leftToRightInc();
if (!varrefp) newp->exprp()->v3error("Unexpected connection to arrayed port");
string newname = varrefp->name() + "__BRA__" + cvtToStr(expr_i) + "__KET__";
AstVarXRef* newVarXRefp
= new AstVarXRef(nodep->fileline(), newname, "", VAccess::WRITE);
newVarXRefp->varp(newp->modVarp());