Reviewers: Jarin, Benedikt Meurer,
Description:
Revert "Revert of [turbofan] greedy: heuristic for memory operands
(patchset #2 id:40001 of https://codereview.chromium.org/1306823005/ )"
This reverts commit f68cd33bdd342819abd5b091591ac78383c2e79d.
BUG=
Please review this at https://codereview.chromium.org/1314423006/
Base URL: https://chromium.googlesource.com/v8/v8.git@master
Affected files (+9, -7 lines):
M src/compiler/greedy-allocator.cc
Index: src/compiler/greedy-allocator.cc
diff --git a/src/compiler/greedy-allocator.cc
b/src/compiler/greedy-allocator.cc
index
44f2d4f8160a4893cc3964e21fc0ecb6dd7629e5..aad322e3588eb90823fd05d51a09699fc20b78f5
100644
--- a/src/compiler/greedy-allocator.cc
+++ b/src/compiler/greedy-allocator.cc
@@ -256,7 +256,7 @@ void
GreedyAllocator::SplitAndSpillRangesDefinedByMemoryOperand() {
for (size_t i = 0; i < initial_range_count; ++i) {
auto range = data()->live_ranges()[i];
if (!CanProcessRange(range)) continue;
- if (range->HasNoSpillType()) continue;
+ if (!range->HasSpillOperand()) continue;
LifetimePosition start = range->Start();
TRACE("Live range %d:%d is defined by a spill operand.\n",
@@ -273,12 +273,14 @@ void
GreedyAllocator::SplitAndSpillRangesDefinedByMemoryOperand() {
} else if (pos->pos() > range->Start().NextStart()) {
// Do not spill live range eagerly if use position that can benefit
from
// the register is too close to the start of live range.
- auto split_pos = pos->pos();
- if (data()->IsBlockBoundary(split_pos.Start())) {
- split_pos = split_pos.Start();
- } else {
- split_pos = split_pos.PrevStart().End();
- }
+ auto split_pos = GetSplitPositionForInstruction(
+ range, data()->code(), pos->pos().ToInstructionIndex());
+ // There is no place to split, so we can't split and spill.
+ if (!split_pos.IsValid()) continue;
+
+ split_pos =
+ FindOptimalSplitPos(range->Start().NextFullStart(), split_pos);
+
Split(range, data(), split_pos);
Spill(range);
}
--
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