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Fix scheduler not to connect final merge block in the graph to its inputs.

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R=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/667953002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24780 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
titzer@chromium.org 2014-10-21 15:12:45 +00:00
parent 1c5fafe890
commit 0c4f8bc6c4
1 changed files with 9 additions and 4 deletions
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13
src/compiler/scheduler.cc
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@ -283,6 +283,9 @@ class CFGBuilder {
}
void ConnectMerge(Node* merge) {
// Don't connect the special merge at the end to its predecessors.
if (IsFinalMerge(merge)) return;
BasicBlock* block = schedule_->block(merge);
DCHECK(block != NULL);
// For all of the merge's control inputs, add a goto at the end to the
@ -290,10 +293,8 @@ class CFGBuilder {
for (InputIter j = merge->inputs().begin(); j != merge->inputs().end();
++j) {
BasicBlock* predecessor_block = schedule_->block(*j);
if ((*j)->opcode() != IrOpcode::kReturn) {
TraceConnect(merge, predecessor_block, block);
schedule_->AddGoto(predecessor_block, block);
}
TraceConnect(merge, predecessor_block, block);
schedule_->AddGoto(predecessor_block, block);
}
}
@ -314,6 +315,10 @@ class CFGBuilder {
block->id().ToInt(), succ->id().ToInt());
}
}
bool IsFinalMerge(Node* node) {
return (node == scheduler_->graph_->end()->InputAt(0));
}
};