c01bfa9af9
This CL implements an assembly order optimization that moves blocks that end a loop with an unconditional backedge to the beginning of the loop, saving a branch. R=jarin@chromium.org,mstarzinger@chromium.org BUG=v8:8423 Change-Id: I8a5d25f5472d71227af0f623277ea8d0a8d69867 Reviewed-on: https://chromium-review.googlesource.com/c/1335944 Commit-Queue: Ben Titzer <titzer@chromium.org> Reviewed-by: Michael Starzinger <mstarzinger@chromium.org> Cr-Commit-Position: refs/heads/master@{#57572}
78 lines
2.1 KiB
JavaScript
78 lines
2.1 KiB
JavaScript
// Copyright 2018 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: --turbo-loop-rotation --noliftoff --nowasm-tier-up
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load("test/mjsunit/wasm/wasm-constants.js");
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load("test/mjsunit/wasm/wasm-module-builder.js");
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(function TestTrivialLoop1() {
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print(arguments.callee.name);
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var builder = new WasmModuleBuilder();
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builder.addFunction("main", kSig_v_i)
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.addBody([
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kExprLoop, kWasmStmt,
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kExprGetLocal, 0,
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kExprI32Const, 1,
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kExprI32Sub,
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kExprTeeLocal, 0,
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kExprBrIf, 0,
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kExprEnd,
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])
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.exportFunc();
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let module = new WebAssembly.Module(builder.toBuffer());
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let instance = new WebAssembly.Instance(module);
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instance.exports.main(1);
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instance.exports.main(10);
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instance.exports.main(100);
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})();
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(function TestTrivialLoop2() {
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print(arguments.callee.name);
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var builder = new WasmModuleBuilder();
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builder.addFunction("main", kSig_v_i)
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.addBody([
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kExprLoop, kWasmStmt,
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kExprGetLocal, 0,
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kExprI32Const, 1,
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kExprI32Sub,
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kExprTeeLocal, 0,
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kExprBrIf, 1,
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kExprBr, 0,
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kExprEnd,
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])
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.exportFunc();
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let module = new WebAssembly.Module(builder.toBuffer());
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let instance = new WebAssembly.Instance(module);
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instance.exports.main(1);
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instance.exports.main(10);
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instance.exports.main(100);
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})();
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(function TestNonRotatedLoopWithStore() {
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print(arguments.callee.name);
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var builder = new WasmModuleBuilder();
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builder.addMemory(1, undefined, false);
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builder.addFunction("main", kSig_v_i)
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.addBody([
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kExprLoop, kWasmStmt,
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kExprGetLocal, 0,
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kExprI32Const, 1,
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kExprI32Sub,
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kExprTeeLocal, 0,
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kExprBrIf, 1,
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kExprI32Const, 0,
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kExprI32Const, 0,
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kExprI32StoreMem, 0, 0,
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kExprBr, 0,
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kExprEnd,
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])
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.exportFunc();
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let module = new WebAssembly.Module(builder.toBuffer());
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let instance = new WebAssembly.Instance(module);
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instance.exports.main(1);
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instance.exports.main(10);
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instance.exports.main(100);
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})();
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