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Support zero-width constants in concatenations.

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This commit is contained in:
Wilson Snyder
2009-06-30 11:54:07 -04:00
parent 18dc947fa9
commit be1a3f427e
5 changed files with 128 additions and 8 deletions
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src/V3Width.cpp
+19 -1
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@@ -202,6 +202,22 @@ private:
nodep->rhsp()->iterateAndNext(*this,WidthVP(ANYSIZE,0,BOTH).p());
nodep->width(nodep->lhsp()->width() + nodep->rhsp()->width(),
nodep->lhsp()->widthMin() + nodep->rhsp()->widthMin());
// Cleanup zero width Verilog2001 {x,{0{foo}}} now,
// otherwise having width(0) will cause later assertions to fire
if (AstReplicate* repp=nodep->lhsp()->castReplicate()) {
if (repp->width()==0) { // Keep rhs
nodep->replaceWith(nodep->rhsp()->unlinkFrBack());
pushDeletep(nodep); nodep=NULL;
return;
}
}
if (AstReplicate* repp=nodep->rhsp()->castReplicate()) {
if (repp->width()==0) { // Keep lhs
nodep->replaceWith(nodep->lhsp()->unlinkFrBack());
pushDeletep(nodep); nodep=NULL;
return;
}
}
}
if (vup->c()->final()) {
if (!nodep->widthSized()) {
@@ -218,7 +234,9 @@ private:
AstConst* constp = nodep->rhsp()->castConst();
if (!constp) { nodep->v3error("Replication value isn't a constant."); return; }
uint32_t times = constp->toUInt();
if (times==0) { nodep->v3error("Replication value is 0."); times=1; }
if (times==0 && !nodep->backp()->castConcat()) { // Concat Visitor will clean it up.
nodep->v3error("Replication value of 0 is only legal under a concatenation."); times=1;
}
nodep->width((nodep->lhsp()->width() * times),
(nodep->lhsp()->widthMin() * times));
}