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// Copyright 2019 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.
"use strict";
d8.file.execute('bigint-util.js');
let initial_diff = 0n;
let a = 0n;
let random_bigints = [];
// This dummy ensures that the feedback for benchmark.run() in the Measure
// function from base.js is not monomorphic, thereby preventing the benchmarks
// below from being inlined. This ensures consistent behavior and comparable
// results.
new BenchmarkSuite('Prevent-Inline-Dummy', [10000], [
new Benchmark('Prevent-Inline-Dummy', true, false, 0, () => {})
]);
new BenchmarkSuite('Subtract-Zero', [1000], [
new Benchmark('Subtract-Zero', true, false, 0, TestSubtractZero,
SetUpTestSubtractZero)
]);
BITS_CASES.forEach((d) => {
new BenchmarkSuite(`Subtract-SameSign-${d}`, [1000], [
new Benchmark(`Subtract-SameSign-${d}`, true, false, 0,
TestSubtractSameSign, () => SetUpTestSubtractSameSign(d))
]);
});
BITS_CASES.forEach((d) => {
new BenchmarkSuite(`Subtract-DifferentSign-${d}`, [1000], [
new Benchmark(`Subtract-DifferentSign-${d}`, true, false, 0,
TestSubtractDifferentSign, () => SetUpTestSubtractDifferentSign(d))
]);
});
new BenchmarkSuite('Subtract-Random', [1000], [
new Benchmark('Subtract-Random', true, false, 0, TestSubtractRandom,
SetUpTestSubtractRandom)
]);
function SetUpTestSubtractSameSign(bits) {
// Subtract a small random negative value from the maximal negative number to
// make sure the result stays negative.
initial_diff = -MaxBigIntWithBits(bits);
a = -SmallRandomBigIntWithBits(bits);
}
function TestSubtractSameSign() {
let diff = initial_diff;
for (let i = 0; i < TEST_ITERATIONS; ++i) {
diff = diff - a;
}
return diff;
}
function SetUpTestSubtractDifferentSign(bits) {
// Subtract a small random negative value from a small positive value so that
// the differnce stays positive but does not grow in digits.
initial_diff = SmallRandomBigIntWithBits(bits);
a = -SmallRandomBigIntWithBits(bits);
}
function TestSubtractDifferentSign() {
let diff = initial_diff;
for (let i = 0; i < TEST_ITERATIONS; ++i) {
diff = diff - a;
}
return diff;
}
function SetUpTestSubtractRandom() {
random_bigints = [];
// RandomBigIntWithBits needs multiples of 4 bits.
const max_in_4bits = RANDOM_BIGINTS_MAX_BITS / 4;
for (let i = 0; i < TEST_ITERATIONS; ++i) {
const bits = Math.floor(Math.random() * max_in_4bits) * 4;
const bigint = RandomBigIntWithBits(bits);
random_bigints.push(Math.random() < 0.5 ? -bigint : bigint);
}
}
function TestSubtractRandom() {
let diff = 0n;
for (let i = 0; i < TEST_ITERATIONS; ++i) {
diff = diff - random_bigints[i];
}
return diff;
}
function SetUpTestSubtractZero() {
initial_diff = 42n;
}
function TestSubtractZero() {
let diff = initial_diff;
for (let i = 0; i < TEST_ITERATIONS; ++i) {
diff = diff - 0n;
}
return diff;
}
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