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[arm64] Set min jumpable size to 4 for Switch

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This CL avoid lowering Switch to jumptable if the case count is small enough(4).

Change-Id: Ida632807558c7403171e803947e7484908e0e028
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1605357
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Martyn Capewell <martyn.capewell@arm.com>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61954}
This commit is contained in:
Jun Lim 2019-05-10 12:51:18 -05:00 committed by Commit Bot
parent 48483df07d
commit 777bed9697
1 changed files with 1 additions and 1 deletions
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2
src/compiler/backend/arm64/instruction-selector-arm64.cc
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@ -2451,7 +2451,7 @@ void InstructionSelector::VisitSwitch(Node* node, const SwitchInfo& sw) {
size_t table_time_cost = 3;
size_t lookup_space_cost = 3 + 2 * sw.case_count();
size_t lookup_time_cost = sw.case_count();
if (sw.case_count() > 0 &&
if (sw.case_count() > 4 &&
table_space_cost + 3 * table_time_cost <=
lookup_space_cost + 3 * lookup_time_cost &&
sw.min_value() > std::numeric_limits<int32_t>::min() &&