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// Copyright 2021 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Flags: --experimental-wasm-gc --no-liftoff
d8.file.execute("test/mjsunit/wasm/wasm-module-builder.js");
// Test that comparisons with array length in a loop get optimized away.
(function ArrayLoopOptimizationTest() {
var builder = new WasmModuleBuilder();
var array_index = builder.addArray(kWasmI32, true);
// Increase these parameters to measure performance.
let array_size = 10; // 100000000;
let iterations = 1; // 50;
builder.addFunction("array_inc", kSig_v_v)
.addLocals(wasmRefType(array_index), 1)
.addLocals(kWasmI32, 2)
// Locals: 0 -> array, 1 -> length, 2 -> index
.addBody([
...wasmI32Const(array_size),
kExprCallFunction, 1,
kExprLocalSet, 0,
// length = array.length
kExprLocalGet, 0,
kGCPrefix, kExprArrayLen,
kExprLocalSet, 1,
// while (true) {
kExprLoop, kWasmVoid,
// if (index < length) {
kExprLocalGet, 2,
kExprLocalGet, 1,
kExprI32LtU,
kExprIf, kWasmVoid,
// array[index] = array[index] + 5;
kExprLocalGet, 0,
kExprLocalGet, 2,
kExprLocalGet, 0,
kExprLocalGet, 2,
kGCPrefix, kExprArrayGet, array_index,
kExprI32Const, 5,
kExprI32Add,
kGCPrefix, kExprArraySet, array_index,
// index = index + 1;
kExprLocalGet, 2,
kExprI32Const, 1,
kExprI32Add,
kExprLocalSet, 2,
// continue;
kExprBr, 1,
// }
// break;
kExprEnd,
// }
kExprEnd])
.exportFunc();
builder.addFunction("make_array",
makeSig([kWasmI32], [wasmRefType(array_index)]))
.addBody([kExprLocalGet, 0, kGCPrefix, kExprArrayNewDefault, array_index])
var instance = builder.instantiate({});
let before = Date.now();
for (let i = 0; i < iterations; i++) {
instance.exports.array_inc();
}
let after = Date.now();
print(
"Average of " + iterations + " runs: " +
(after - before)/iterations + "ms");
})();
(function ImmutableLoadThroughEffect() {
var builder = new WasmModuleBuilder();
var struct = builder.addStruct([
makeField(kWasmI32, false), makeField(kWasmI32, true)]);
let effect = builder.addImport('m', 'f', kSig_v_v);
builder.addFunction("main", kSig_i_i)
.addLocals(wasmRefType(struct), 1)
.addBody([
// Initialize an object
kExprLocalGet, 0,
kExprLocalGet, 0, kExprI32Const, 1, kExprI32Add,
kGCPrefix, kExprStructNew, struct,
kExprLocalSet, 1,
// Introduce unknown effect
kExprCallFunction, effect,
// TF should be able to eliminate this load...
kExprLocalGet, 1,
kGCPrefix, kExprStructGet, struct, 0,
// ... but not this one.
kExprLocalGet, 1,
kGCPrefix, kExprStructGet, struct, 1,
kExprI32Add
])
.exportFunc();
var instance = builder.instantiate({m : { f: function () {} }});
assertEquals(85, instance.exports.main(42));
})();
(function FunctionTypeCheckThroughEffect() {
var builder = new WasmModuleBuilder();
var sig = builder.addType(kSig_i_i);
let effect = builder.addImport('m', 'f', kSig_v_v);
builder.addFunction("input", sig)
.addBody([kExprLocalGet, 0])
.exportFunc();
builder.addFunction("main", makeSig([wasmRefType(kWasmFuncRef)], [kWasmI32]))
.addBody([
// Type check the function
kExprLocalGet, 0, kGCPrefix, kExprRefCast, sig,
kExprDrop,
// Introduce unknown effect
kExprCallFunction, effect,
// TF should be able to eliminate the second type check, and return the
// constant 1.
kExprLocalGet, 0,
kGCPrefix, kExprRefTestDeprecated, sig])
.exportFunc();
var instance = builder.instantiate({m : { f: function () {} }});
assertEquals(1, instance.exports.main(instance.exports.input));
})();
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