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[reg-alloc] Propagate control-flow hint after splits

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Change-Id: I01199e24c4bb5d8496c13077342e03a41943cdbd
Bug: v8:9088
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1684074
Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62481}
This commit is contained in:
Sigurd Schneider 2019-07-01 18:28:10 +02:00 committed by Commit Bot
parent 30c1bee848
commit d9861b2969
1 changed files with 8 additions and 0 deletions
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8
src/compiler/backend/register-allocator.cc
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@ -4559,6 +4559,14 @@ void LinearScanAllocator::SpillBetweenUntil(LiveRange* range,
LiveRange* third_part =
SplitBetween(second_part, split_start, third_part_end);
if (GetInstructionBlock(data()->code(), second_part->Start())
->IsDeferred()) {
// Try to use the same register as before.
TRACE("Setting control flow hint for %d:%d to %s\n",
third_part->TopLevel()->vreg(), third_part->relative_id(),
RegisterName(range->controlflow_hint()));
third_part->set_controlflow_hint(range->controlflow_hint());
}
AddToUnhandled(third_part);
// This can happen, even if we checked for start < end above, as we fiddle