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[turbofan] Instruction scheduler: keep ready nodes list sorted by latency.

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This significantly speed-up the instruction scheduler when the ready list
contains a large number of instruction.

R=jarin@chromium.org, bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/2281523002
Cr-Commit-Position: refs/heads/master@{#38919}
This commit is contained in:
baptiste.afsa 2016-08-25 11:04:58 -07:00 committed by Commit bot
parent 51c186dd98
commit f93ca29cac
2 changed files with 14 additions and 18 deletions
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21
src/compiler/instruction-scheduler.cc
View File

@ -11,11 +11,16 @@ namespace v8 {
namespace internal {
namespace compiler {
// Compare the two nodes and return true if node1 is a better candidate than
// node2 (i.e. node1 should be scheduled before node2).
bool InstructionScheduler::CriticalPathFirstQueue::CompareNodes(
ScheduleGraphNode *node1, ScheduleGraphNode *node2) const {
return node1->total_latency() > node2->total_latency();
void InstructionScheduler::SchedulingQueueBase::AddNode(
ScheduleGraphNode* node) {
// We keep the ready list sorted by total latency so that we can quickly find
// the next best candidate to schedule.
auto it = nodes_.begin();
while ((it != nodes_.end()) &&
((*it)->total_latency() > node->total_latency())) {
++it;
}
nodes_.insert(it, node);
}
@ -24,12 +29,10 @@ InstructionScheduler::CriticalPathFirstQueue::PopBestCandidate(int cycle) {
DCHECK(!IsEmpty());
auto candidate = nodes_.end();
for (auto iterator = nodes_.begin(); iterator != nodes_.end(); ++iterator) {
// We only consider instructions that have all their operands ready and
// we try to schedule the critical path first.
// We only consider instructions that have all their operands ready.
if (cycle >= (*iterator)->start_cycle()) {
if ((candidate == nodes_.end()) || CompareNodes(*iterator, *candidate)) {
candidate = iterator;
}
break;
}
}

9
src/compiler/instruction-scheduler.h
View File

@ -101,9 +101,7 @@ class InstructionScheduler final : public ZoneObject {
nodes_(scheduler->zone()) {
}
void AddNode(ScheduleGraphNode* node) {
nodes_.push_back(node);
}
void AddNode(ScheduleGraphNode* node);
bool IsEmpty() const {
return nodes_.empty();
@ -125,11 +123,6 @@ class InstructionScheduler final : public ZoneObject {
// Look for the best candidate to schedule, remove it from the queue and
// return it.
ScheduleGraphNode* PopBestCandidate(int cycle);
private:
// Compare the two nodes and return true if node1 is a better candidate than
// node2 (i.e. node1 should be scheduled before node2).
bool CompareNodes(ScheduleGraphNode *node1, ScheduleGraphNode *node2) const;
};
// A queue which pop a random node from the queue to perform stress tests on