1. 25 Jun, 2021 1 commit
  2. 26 Apr, 2021 1 commit
    • Jakob Gruber's avatar
      [compiler] Remove --turbo-direct-heap-access · 4f2f14f8
      Jakob Gruber authored
      On a per-job basis, --turbo-direct-heap-access should be equal to
      whether concurrent inlining is enabled. We simplify involved logic by
      removing the flag, and replacing all access to
      
      - FLAG_turbo_direct_heap_access, and
      - FLAG_concurrent_inlining
      
      inside compiler/ with
      OptimizedCompilationInfo::is_concurrent_inlining() (or derived values).
      
      Bug: v8:7790
      Change-Id: I64818e0e1004dded08c784ef1c4bdfd2af990a59
      Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2843345
      Commit-Queue: Jakob Gruber <jgruber@chromium.org>
      Auto-Submit: Jakob Gruber <jgruber@chromium.org>
      Reviewed-by: 's avatarGeorg Neis <neis@chromium.org>
      Cr-Commit-Position: refs/heads/master@{#74166}
      4f2f14f8
  3. 03 Dec, 2020 1 commit
    • Leszek Swirski's avatar
      [compiler] Remove disallow scopes · a6f465d4
      Leszek Swirski authored
      TurboFan creates DisallowHeapAccess scopes, to prevent heap access in
      the concurrent parts of the compiler. Then, for parts of the compiler
      that do want to access the heap, it either creates Allow* scopes (which
      should be avoided since they "punch a hole" in the Disallow* scopes), or
      relies on a weakening of Handle::IsDereferenceAllowed which allows
      handles owned by a LocalHeap to be dereferenced even if there is a
      DisallowHeapDereference scope.
      
      This patch:
      
        a) Strengthens the implicit requirements around handle dereferencing
           to require a running heap on this thread (either main-thread heap
           or an un-parked, un-safepointed LocalHeap).
        b) Removes the overly strict Disallow scopes in TurboFan, relying
           instead on implicit requirements for allocation/handle
           dereferencing in off-thread code.
        c) Cleans up the "should_disallow_heap_access" predicate to be more
           explicit about what should be disallowed (e.g. property accesses
           can't be computed concurrently)
      
      Change-Id: Icb56b7764913ac17e2db197a70bb189af88a6978
      Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2554617
      Commit-Queue: Leszek Swirski <leszeks@chromium.org>
      Auto-Submit: Leszek Swirski <leszeks@chromium.org>
      Reviewed-by: 's avatarDominik Inführ <dinfuehr@chromium.org>
      Reviewed-by: 's avatarGeorg Neis <neis@chromium.org>
      Reviewed-by: 's avatarSantiago Aboy Solanes <solanes@chromium.org>
      Cr-Commit-Position: refs/heads/master@{#71600}
      a6f465d4
  4. 26 Feb, 2019 1 commit
  5. 15 Oct, 2018 1 commit
  6. 25 Sep, 2018 1 commit
  7. 17 Sep, 2018 1 commit
  8. 23 Jul, 2018 1 commit
  9. 10 Jul, 2018 1 commit
  10. 09 Jul, 2018 1 commit
  11. 07 Jun, 2018 1 commit
  12. 25 May, 2018 1 commit
  13. 08 May, 2018 1 commit
    • Jaroslav Sevcik's avatar
      [turbofan] Optimize array destructuring · 3fe7d698
      Jaroslav Sevcik authored
      This CL introduces type narrowing and constant folding reducers
      to constant fold code that comes out of inlined destructuring
      of arrays. In particular, array iterator introduces code that
      contains a phi of a temporary array that blocks escape analysis.
      The phi comes from conditional that can be evaluated statically
      (i.e., constant folded), so with better constant folding we
      allow escape analysis to get rid of the temporary array.
      
      On a quick micro-benchmark below, we see more than 6x improvement.
      This is close to the hand-optimized version - if we replace
      body of f with 'return b + a', we get 220ms (versus 218ms with
      destructuring).
      
      function f(a, b) {
        [b, a] = [a, b];
        return a + b;
      }
      
      function sum(count) {
        let s = 0;
        for (let i = 0; i < count; i++) {
          s += f(1, 2);
        }
        return s;
      }
      
      // Warm up
      sum(1e5); sum(1e5);
      console.time("destructure array");
      sum(1e8);
      console.timeEnd("destructure array");
      
      console.timeEnd: destructure array, 213.526000
      
      console.timeEnd: destructure array, 1503.537000
      
      Bug: v8:7728
      Change-Id: Ib7aec1d5897989e6adb1af1eddd516d8b3866db5
      Reviewed-on: https://chromium-review.googlesource.com/1047672Reviewed-by: 's avatarBenedikt Meurer <bmeurer@chromium.org>
      Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
      Cr-Commit-Position: refs/heads/master@{#53048}
      3fe7d698