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DFG: handle simple always blocks

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This commit is contained in:
Geza Lore
2022-10-01 16:46:58 +01:00
parent 84b9502af4
commit 2a12b052f2
6 changed files with 76 additions and 12 deletions
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src/V3Delayed.cpp
+9 -2
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@@ -109,6 +109,11 @@ private:
// METHODS
const AstNode* containingAssignment(const AstNode* nodep) {
while (nodep && !VN_IS(nodep, NodeAssign)) nodep = nodep->backp();
return nodep;
}
void markVarUsage(AstNodeVarRef* nodep, bool blocking) {
// Ignore if warning is disabled on this reference (used by V3Force).
if (nodep->fileline()->warnIsOff(V3ErrorCode::BLKANDNBLK)) return;
@@ -122,8 +127,10 @@ private:
} else {
const bool last_was_blocking = lastrefp->user5();
if (last_was_blocking != blocking) {
const AstNode* const nonblockingp = blocking ? nodep : lastrefp;
const AstNode* const blockingp = blocking ? lastrefp : nodep;
const AstNode* nonblockingp = blocking ? nodep : lastrefp;
if (const AstNode* np = containingAssignment(nonblockingp)) nonblockingp = np;
const AstNode* blockingp = blocking ? lastrefp : nodep;
if (const AstNode* np = containingAssignment(blockingp)) blockingp = np;
vscp->v3warn(
BLKANDNBLK,
"Unsupported: Blocked and non-blocking assignments to same variable: "