0bc4b452af
ML-TF tiering remains very similar to Ignition-TF tiering: - When the interrupt budget is exhausted, enter the TieringManager which potentially decides to tier up and sets the appropriate TieringState on the FeedbackVector. - The prologue on ML function entry recognizes the TieringState (and also available cached TF code) and starts compilation and/or jumps into optimized code. TODOs: - ML-to-TF OSR is not yet supported. - ML code is no longer cached on the FeedbackVector. - Tracing is rudimentary. - The generated function-entry prologue is fairly large and must be either minimized or extracted into a builtin. - Tiering involving Sparkplug is not entirely robust yet (Sparkplug code may be installed with unexpected timing). Bug: v8:7700 Change-Id: I86b0692477f51b9967f318a4093bc874344120b3 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3629149 Reviewed-by: Victor Gomes <victorgomes@chromium.org> Commit-Queue: Jakob Linke <jgruber@chromium.org> Cr-Commit-Position: refs/heads/main@{#82351}
47 lines
1.1 KiB
JavaScript
47 lines
1.1 KiB
JavaScript
// Copyright 2022 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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//
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// Flags: --allow-natives-syntax --maglev --no-stress-opt
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function f(x) {
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var y = 0;
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for (var i = 0; i < x; i++) {
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y = 1;
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}
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return y;
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}
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let keep_going = 100000; // A counter to avoid test hangs on failure.
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function g() {
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// Test that normal tiering (without OptimizeFooOnNextCall) works.
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// We test the entire pipeline, i.e. Ignition-SP-ML-TF.
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f(10);
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// TODO(v8:7700): Enable.
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/*
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if (%IsSparkplugEnabled()) {
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while (!%ActiveTierIsSparkplug(f) && --keep_going) f(10);
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assertTrue(%ActiveTierIsSparkplug(f));
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}
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if (%IsMaglevEnabled()) {
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while (!%ActiveTierIsMaglev(f) && --keep_going) f(10);
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assertTrue(%ActiveTierIsMaglev(f));
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}
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*/
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if (%IsTurbofanEnabled()) {
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while (!%ActiveTierIsTurbofan(f) && --keep_going) f(10);
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assertTrue(%ActiveTierIsTurbofan(f));
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f(10);
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assertTrue(%ActiveTierIsTurbofan(f));
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}
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}
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%NeverOptimizeFunction(g);
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g();
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