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[ptr-compr] Use branchful pointer decompression in generated code

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Locally tested, octane results are the same or better when using
branchful decompression in generated code.

The biggest one is DeltaBlue in x64 which improves about 25%.
x64's EarleyBoyer is another important one with ~10% improvement.

Bug: v8:7703
Change-Id: Ie1edd6e216b307a1f5263b22472c0a64f76400fc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1690955
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62577}
This commit is contained in:
Santiago Aboy Solanes 2019-07-08 15:42:46 +01:00 committed by Commit Bot
parent e9169905ab
commit 6ad6dd1a7a
1 changed files with 1 additions and 1 deletions
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2
src/common/globals.h
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@ -240,7 +240,7 @@ using AtomicTagged_t = base::AtomicWord;
// Defines whether the branchless or branchful implementation of pointer
// decompression should be used.
constexpr bool kUseBranchlessPtrDecompressionInRuntime = false;
constexpr bool kUseBranchlessPtrDecompressionInGeneratedCode = true;
constexpr bool kUseBranchlessPtrDecompressionInGeneratedCode = false;
STATIC_ASSERT(kTaggedSize == (1 << kTaggedSizeLog2));
STATIC_ASSERT((kTaggedSize == 8) == TAGGED_SIZE_8_BYTES);