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Fix spv.branch-return.vert.

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This commit is contained in:
Dejan Mircevski 2016-01-18 17:33:25 -05:00
parent baa55a1591
commit 9c591487ad
1 changed files with 10 additions and 6 deletions
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16
SPIRV/InReadableOrder.cpp
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@ -39,7 +39,7 @@ void spv::inReadableOrder(Block* root, std::function<void(Block*)> callback) {
// Prerequisites for a merge block; must be completed prior to visiting the
// merge block.
std::unordered_map<Id, BlockSet> prereqs;
IdToBool visited; // Whether a block has already been visited.
IdToBool visited; // Whether a block has already been visited.
std::deque<Block*> worklist; // DFS worklist
worklist.push_back(root);
while (!worklist.empty()) {
@ -48,18 +48,22 @@ void spv::inReadableOrder(Block* root, std::function<void(Block*)> callback) {
// Nodes may be pushed repeadetly (before they're first visited) if they
// have multiple predecessors. Skip the already-visited ones.
if (visited[current->getId()]) continue;
if (delay(prereqs[current->getId()], visited)) {
// Not every prerequisite has been visited -- push it off for later.
worklist.push_back(current);
continue;
}
callback(current);
visited[current->getId()] = true;
if (auto merge = current->getMergeInstruction()) {
auto& mergePrereqs = prereqs[merge->getIdOperand(0)];
Id mergeId = merge->getIdOperand(0);
auto& mergePrereqs = prereqs[mergeId];
// Delay visiting merge blocks until all branches are visited.
for (const auto succ : current->getSuccessors())
mergePrereqs.insert(succ->getId());
if (succ->getId() != mergeId) mergePrereqs.insert(succ->getId());
}
for (auto succ : current->getSuccessors()) {
if (!visited[succ->getId()] && !delay(prereqs[succ->getId()], visited)) {
worklist.push_back(succ);
}
if (!visited[succ->getId()]) worklist.push_back(succ);
}
}
}