597a9c7bcf
Bug: v8:7748 Change-Id: Ifdc661d3f4f95d8bd0dbacdface6aed15b9f1942 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2960210 Commit-Queue: Manos Koukoutos <manoskouk@chromium.org> Reviewed-by: Jakob Kummerow <jkummerow@chromium.org> Cr-Commit-Position: refs/heads/master@{#75156}
110 lines
3.9 KiB
JavaScript
110 lines
3.9 KiB
JavaScript
// Copyright 2021 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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// Flags: --experimental-wasm-gc-experiments --no-liftoff
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d8.file.execute("test/mjsunit/wasm/wasm-module-builder.js");
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// This is benchmark to investigate at which point it is more efficient to call
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// a memcpy-based builtin for array.copy, rather than copying
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// element-by-element.
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// How to run:
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// - Set {iterations} to a high number to get better measurements
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// - Change the value of {length} to find point at which the builtin becomes
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// faster.
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// - Change {array_type} if you want to test different types.
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// Right now, the limit is found to be in the 25-30 range.
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// TODO(7748): Measure again if we implement array.copy with a fast C call.
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(function ArrayCopyBenchmark() {
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let array_length = 27;
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let iterations = 1;
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var builder = new WasmModuleBuilder();
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let struct_index = builder.addStruct([makeField(kWasmI32, true),
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makeField(kWasmI8, false)]);
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let array_type = kWasmI32; // Also try kWasmI64, wasmOptRefType(struct_index)
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var array_index = builder.addArray(array_type, true);
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var from = builder.addGlobal(wasmOptRefType(array_index), true);
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var to = builder.addGlobal(wasmOptRefType(array_index), true);
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builder.addFunction("init", kSig_v_v)
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.addBody([
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...wasmI32Const(array_length),
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kGCPrefix, kExprRttCanon, array_index,
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kGCPrefix, kExprArrayNewDefault, array_index,
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kExprGlobalSet, from.index,
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...wasmI32Const(array_length),
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kGCPrefix, kExprRttCanon, array_index,
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kGCPrefix, kExprArrayNewDefault, array_index,
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kExprGlobalSet, to.index
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])
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.exportFunc();
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builder.addFunction("array_copy", kSig_v_v)
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.addLocals(kWasmI32, 1)
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.addBody([
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kExprLoop, kWasmVoid,
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kExprGlobalGet, to.index,
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...wasmI32Const(0),
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kExprGlobalGet, from.index,
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...wasmI32Const(0),
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...wasmI32Const(array_length),
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kGCPrefix, kExprArrayCopy, array_index, array_index,
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// Outer loop: run everything {iterations} times.
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kExprLocalGet, 0, kExprI32Const, 1, kExprI32Add, kExprLocalSet, 0,
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kExprLocalGet, 0, ...wasmI32Const(iterations), kExprI32LtS,
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kExprBrIf, 0,
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kExprEnd])
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.exportFunc();
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builder.addFunction("loop_copy", kSig_v_v)
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.addLocals(kWasmI32, 2)
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.addBody([
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kExprLoop, kWasmVoid,
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...wasmI32Const(0),
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kExprLocalSet, 0,
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kExprGlobalGet, from.index, kExprRefAsNonNull,
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kExprGlobalGet, to.index, kExprRefAsNonNull,
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kExprLet, kWasmVoid, 1, 2, kWasmRef, array_index,
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kExprLoop, kWasmVoid,
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kExprLocalGet, 1, // array
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kExprLocalGet, 2, // index
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// value
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kExprLocalGet, 0, kExprLocalGet, 2,
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kGCPrefix, kExprArrayGet, array_index,
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// array.set
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kGCPrefix, kExprArraySet, array_index,
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// index++
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kExprLocalGet, 2, kExprI32Const, 1, kExprI32Add, kExprLocalSet, 2,
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// if (index < array_length) goto loop;
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kExprLocalGet, 2, ...wasmI32Const(array_length), kExprI32LtU,
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kExprBrIf, 0,
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kExprEnd,
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kExprEnd,
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// Outer loop: run everything {iterations} times.
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kExprLocalGet, 1, kExprI32Const, 1, kExprI32Add, kExprLocalSet, 1,
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kExprLocalGet, 1, ...wasmI32Const(iterations), kExprI32LtS,
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kExprBrIf, 0,
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kExprEnd])
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.exportFunc();
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var instance = builder.instantiate({});
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instance.exports.init();
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print("Array length: " + array_length + ", #iterations: " + iterations);
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{
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let before = Date.now();
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instance.exports.array_copy();
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let after = Date.now();
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print("array.copy: " + (after - before) + "ms");
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}
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{
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let before = Date.now();
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instance.exports.loop_copy();
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let after = Date.now();
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print("loop copy: " + (after - before) + "ms");
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}
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})();
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