1. 17 Feb, 2021 1 commit
    • Seth Brenith's avatar
      Reland "[interpreter] Short Star bytecode" · 7be64db4
      Seth Brenith authored
      This is a reland of cf93071c
      
      Original change's description:
      > [interpreter] Short Star bytecode
      >
      > Design doc:
      > https://docs.google.com/document/d/1g_NExMT78II_KnIYNa9MvyPYIj23qAiFUEsyemY5KRk/edit
      >
      > This change adds 16 new interpreter opcodes, kStar0 through kStar15, so
      > that we can use a single byte to represent the common operation of
      > storing to a low-numbered register. This generally reduces the quantity
      > of bytecode generated on web sites by 8-9%.
      >
      > In order to not degrade speed, a couple of other changes are required:
      >
      > The existing lookahead logic to check for Star after certain other
      > bytecode handlers is updated to check for these new short Star codes
      > instead. Furthermore, that lookahead logic is updated to contain its own
      > copy of the dispatch jump rather than merging control flow with the
      > lookahead-failed case, to improve branch prediction.
      >
      > A bunch of constants use bytecode size in bytes as a proxy for the size
      > or complexity of a function, and are adjusted downward proportionally to
      > the decrease in generated bytecode size.
      >
      > Other small drive-by fix: update generate-bytecode-expectations to emit
      > \n instead of \r\n on Windows.
      >
      > Change-Id: I6307c2b0f5794a3a1088bb0fb94f6e1615441ed5
      > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2641180
      > Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
      > Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
      > Cr-Commit-Position: refs/heads/master@{#72773}
      
      Change-Id: I1afb670c25694498b3989de615858f984a8c7f6f
      Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2698057
      Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
      Reviewed-by: 's avatarRoss McIlroy <rmcilroy@chromium.org>
      Reviewed-by: 's avatarMythri Alle <mythria@chromium.org>
      Cr-Commit-Position: refs/heads/master@{#72821}
      7be64db4
  2. 16 Feb, 2021 2 commits
    • Leszek Swirski's avatar
      Revert "[interpreter] Short Star bytecode" · 08a49bbe
      Leszek Swirski authored
      This reverts commit cf93071c.
      
      Reason for revert: Speculative revert because of Mac4 GC stress failure: https://ci.chromium.org/ui/p/v8/builders/ci/V8%20Mac64%20GC%20Stress/16697/overview
      
      Original change's description:
      > [interpreter] Short Star bytecode
      >
      > Design doc:
      > https://docs.google.com/document/d/1g_NExMT78II_KnIYNa9MvyPYIj23qAiFUEsyemY5KRk/edit
      >
      > This change adds 16 new interpreter opcodes, kStar0 through kStar15, so
      > that we can use a single byte to represent the common operation of
      > storing to a low-numbered register. This generally reduces the quantity
      > of bytecode generated on web sites by 8-9%.
      >
      > In order to not degrade speed, a couple of other changes are required:
      >
      > The existing lookahead logic to check for Star after certain other
      > bytecode handlers is updated to check for these new short Star codes
      > instead. Furthermore, that lookahead logic is updated to contain its own
      > copy of the dispatch jump rather than merging control flow with the
      > lookahead-failed case, to improve branch prediction.
      >
      > A bunch of constants use bytecode size in bytes as a proxy for the size
      > or complexity of a function, and are adjusted downward proportionally to
      > the decrease in generated bytecode size.
      >
      > Other small drive-by fix: update generate-bytecode-expectations to emit
      > \n instead of \r\n on Windows.
      >
      > Change-Id: I6307c2b0f5794a3a1088bb0fb94f6e1615441ed5
      > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2641180
      > Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
      > Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
      > Cr-Commit-Position: refs/heads/master@{#72773}
      
      TBR=rmcilroy@chromium.org,mythria@chromium.org,seth.brenith@microsoft.com
      
      Change-Id: I0162b9400861b90bacef27cca9aebc8ab9d74c10
      No-Presubmit: true
      No-Tree-Checks: true
      No-Try: true
      Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2697350Reviewed-by: 's avatarLeszek Swirski <leszeks@chromium.org>
      Commit-Queue: Leszek Swirski <leszeks@chromium.org>
      Cr-Commit-Position: refs/heads/master@{#72777}
      08a49bbe
    • Seth Brenith's avatar
      [interpreter] Short Star bytecode · cf93071c
      Seth Brenith authored
      Design doc:
      https://docs.google.com/document/d/1g_NExMT78II_KnIYNa9MvyPYIj23qAiFUEsyemY5KRk/edit
      
      This change adds 16 new interpreter opcodes, kStar0 through kStar15, so
      that we can use a single byte to represent the common operation of
      storing to a low-numbered register. This generally reduces the quantity
      of bytecode generated on web sites by 8-9%.
      
      In order to not degrade speed, a couple of other changes are required:
      
      The existing lookahead logic to check for Star after certain other
      bytecode handlers is updated to check for these new short Star codes
      instead. Furthermore, that lookahead logic is updated to contain its own
      copy of the dispatch jump rather than merging control flow with the
      lookahead-failed case, to improve branch prediction.
      
      A bunch of constants use bytecode size in bytes as a proxy for the size
      or complexity of a function, and are adjusted downward proportionally to
      the decrease in generated bytecode size.
      
      Other small drive-by fix: update generate-bytecode-expectations to emit
      \n instead of \r\n on Windows.
      
      Change-Id: I6307c2b0f5794a3a1088bb0fb94f6e1615441ed5
      Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2641180Reviewed-by: 's avatarRoss McIlroy <rmcilroy@chromium.org>
      Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
      Cr-Commit-Position: refs/heads/master@{#72773}
      cf93071c
  3. 10 Feb, 2020 1 commit
  4. 08 Nov, 2018 1 commit
  5. 05 Jul, 2018 1 commit
  6. 02 Mar, 2018 1 commit
  7. 27 Jul, 2017 1 commit
  8. 25 Jul, 2017 1 commit
  9. 17 Jul, 2017 1 commit
    • Leszek Swirski's avatar
      Revert "[runtime] Move profiler ticks from SFI to feedback vector" · 14c5c4fd
      Leszek Swirski authored
      This reverts commit a2fcdc7c.
      
      Reason for revert: Large regressions in RCS (https://chromeperf.appspot.com/group_report?bug_id=740126)
      
      Original change's description:
      > [runtime] Move profiler ticks from SFI to feedback vector
      > 
      > Instead of counting profiler ticks on the shared function info (which is
      > shared between native contexts), count them on the feedback vector
      > (which is not). This allows us to continue pushing optimization
      > decisions off the SFI, onto the feedback vector.
      > 
      > Note that a side-effect of this is that ICs don't have to walk the stack
      > to reset profiler ticks, as they can access the feedback vector directly
      > from their feedback nexus.
      > 
      > Change-Id: I232ae9e759fca75cd89d393148a4ff42caa2646f
      > Reviewed-on: https://chromium-review.googlesource.com/544888
      > Reviewed-by: Igor Sheludko <ishell@chromium.org>
      > Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
      > Commit-Queue: Leszek Swirski <leszeks@chromium.org>
      > Cr-Commit-Position: refs/heads/master@{#46411}
      
      TBR=rmcilroy@chromium.org,leszeks@chromium.org,ishell@chromium.org
      
      # Not skipping CQ checks because original CL landed > 1 day ago.
      
      Change-Id: Id587e4172e300c420f93c49744a2a0e66696edf8
      Reviewed-on: https://chromium-review.googlesource.com/574227
      Commit-Queue: Leszek Swirski <leszeks@chromium.org>
      Reviewed-by: 's avatarLeszek Swirski <leszeks@chromium.org>
      Cr-Commit-Position: refs/heads/master@{#46702}
      14c5c4fd
  10. 14 Jul, 2017 1 commit
    • Alexey Kozyatinskiy's avatar
      [inspector] improve return position of explicit return in non-async function · 08965860
      Alexey Kozyatinskiy authored
      Goal of this CL: explicit return from non-async function has position after
      return expression as return position (will unblock [1]).
      
      BytecodeArrayBuilder has SetStatementPosition and SetExpressionPosition methods.
      If one of these methods is called then next generated bytecode will get passed
      position. It's general treatment for most cases.
      Unfortunately it doesn't work for Returns:
      - debugger requires source positions exactly on kReturn bytecode in stepping
        implementation,
      - BytecodeGenerator::BuildReturn and BytecodeGenerator::BuildAsyncReturn
        generates more then one bytecode and general solution will put return position
        on first generated bytecode,
      - it's not easy to split BuildReturn function into two parts to allow something
        like following in BytecodeGenerator::VisitReturnStatement since generated
        bytecodes are actually controlled by execution_control().
      ..->BuildReturnPrologue();
      ..->SetReturnPosition(stmt);
      ..->Return();
      
      In this CL we pass ReturnStatement through ExecutionControl and use it for
      position when we emit return bytecode right here.
      
      So this CL only will improve return position for returns inside of non-async
      functions, I'll address async functions later.
      
      [1] https://chromium-review.googlesource.com/c/543161/
      
      Change-Id: Iede512c120b00c209990bf50c20e7d23dc0d65db
      Reviewed-on: https://chromium-review.googlesource.com/560738
      Commit-Queue: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
      Reviewed-by: 's avatarAdam Klein <adamk@chromium.org>
      Reviewed-by: 's avatarMichael Starzinger <mstarzinger@chromium.org>
      Reviewed-by: 's avatarRoss McIlroy <rmcilroy@chromium.org>
      Reviewed-by: 's avatarJakob Gruber <jgruber@chromium.org>
      Cr-Commit-Position: refs/heads/master@{#46687}
      08965860
  11. 12 Jul, 2017 1 commit
  12. 05 Jul, 2017 1 commit
  13. 16 Jun, 2017 1 commit
  14. 29 May, 2017 1 commit
  15. 10 May, 2017 1 commit
  16. 08 May, 2017 1 commit
    • Ross McIlroy's avatar
      Revert "Reland: [TypeFeedbackVector] Store optimized code in the vector" · fd749344
      Ross McIlroy authored
      This reverts commit 662aa425.
      
      Reason for revert: Crashing on Canary
      BUG=chromium:718891
      
      Original change's description:
      > Reland: [TypeFeedbackVector] Store optimized code in the vector
      > 
      > Since the feedback vector is itself a native context structure, why
      > not store optimized code for a function in there rather than in
      > a map from native context to code? This allows us to get rid of
      > the optimized code map in the SharedFunctionInfo, saving a pointer,
      > and making lookup of any optimized code quicker.
      > 
      > Original patch by Michael Stanton <mvstanton@chromium.org>
      > 
      > BUG=v8:6246
      > TBR=yangguo@chromium.org,ulan@chromium.org
      > 
      > Change-Id: Ic83e4011148164ef080c63215a0c77f1dfb7f327
      > Reviewed-on: https://chromium-review.googlesource.com/494487
      > Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
      > Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
      > Cr-Commit-Position: refs/heads/master@{#45084}
      
      TBR=ulan@chromium.org,rmcilroy@chromium.org,yangguo@chromium.org,jarin@chromium.org
      # Not skipping CQ checks because original CL landed > 1 day ago.
      BUG=v8:6246
      
      Change-Id: Idab648d6fe260862c2a0e35366df19dcecf13a82
      Reviewed-on: https://chromium-review.googlesource.com/498633Reviewed-by: 's avatarRoss McIlroy <rmcilroy@chromium.org>
      Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
      Cr-Commit-Position: refs/heads/master@{#45174}
      fd749344
  17. 04 May, 2017 1 commit
    • Ross McIlroy's avatar
      Reland: [TypeFeedbackVector] Store optimized code in the vector · 662aa425
      Ross McIlroy authored
      Since the feedback vector is itself a native context structure, why
      not store optimized code for a function in there rather than in
      a map from native context to code? This allows us to get rid of
      the optimized code map in the SharedFunctionInfo, saving a pointer,
      and making lookup of any optimized code quicker.
      
      Original patch by Michael Stanton <mvstanton@chromium.org>
      
      BUG=v8:6246
      TBR=yangguo@chromium.org,ulan@chromium.org
      
      Change-Id: Ic83e4011148164ef080c63215a0c77f1dfb7f327
      Reviewed-on: https://chromium-review.googlesource.com/494487Reviewed-by: 's avatarJaroslav Sevcik <jarin@chromium.org>
      Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
      Cr-Commit-Position: refs/heads/master@{#45084}
      662aa425
  18. 02 May, 2017 2 commits
  19. 05 Apr, 2017 1 commit
  20. 03 Apr, 2017 1 commit
    • rmcilroy's avatar
      [Interpreter] Optimize code of the form 'if (x === undefined)'. · f4f58e31
      rmcilroy authored
      Translates code of the form 'if (x === undefined)' into the JumpIfUndefined
      bytecode, and similarly for comparisons with null. Also adds bytecodes for
      JumpIfNotUndefined / Null.
      
      Moves the peephole optimization for CompareUndefined out of the peephole
      optimizer and into the BytecodeGenerator, having the side-effect of enabling
      it for comparisons with undefined on both side of the compare operation.
      
      BUG=v8:6107
      
      Review-Url: https://codereview.chromium.org/2793923002
      Cr-Commit-Position: refs/heads/master@{#44341}
      f4f58e31
  21. 30 Jan, 2017 1 commit
    • mvstanton's avatar
      [TypeFeedbackVector] Combine the literals array and the feedback vector. · 93f05b64
      mvstanton authored
      They have the same lifetime. It's a match!
      
      Both structures are native context dependent and dealt with (creation,
      clearing, gathering feedback) at the same time. By treating the spaces used
      for literal boilerplates as feedback vector slots, we no longer have to keep
      track of the materialized literal count elsewhere.
      
      A follow-on CL removes even more parser infrastructure related to this count.
      
      BUG=v8:5456
      
      Review-Url: https://codereview.chromium.org/2655853010
      Cr-Commit-Position: refs/heads/master@{#42771}
      93f05b64
  22. 25 Jan, 2017 1 commit
  23. 16 Dec, 2016 1 commit
  24. 06 Dec, 2016 1 commit
    • mythria's avatar
      [Interpreter] Optimize equality check with null/undefined with a check on the map. · 9119d169
      mythria authored
      Equality with null/undefined is equivalent to a check on the undetectable bit
      on the map of the object. This would be more efficient than performing the entire
      comparison operation.
      
      This cl introduces:
      1. A new bytecode called TestUndetectable that checks if the object is null/undefined.
      2. Updates peeophole optimizer to emit TestUndetectable when a LdaNull/Undefined
      precedes equality check.
      4. TestUndetectable is transformed to ObjectIsUndetectable operator when building
      turbofan graph.
      
      BUG=v8:4280
      
      Review-Url: https://codereview.chromium.org/2547043002
      Cr-Commit-Position: refs/heads/master@{#41514}
      9119d169