Stephen Adams
8f3b2e1853
Various algebraic simplifications of bitwise operations. Together they allow the Flutter Color class to be well optimized. Change-Id: Icf7f4f14f77045f943cdec41c6a526a42c179538 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/150268 Commit-Queue: Stephen Adams <sra@google.com> Reviewed-by: Joshua Litt <joshualitt@google.com>
99 lines
2.2 KiB
Dart
99 lines
2.2 KiB
Dart
// Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// @dart = 2.7
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library bitops2_test;
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import 'dart:async';
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import 'package:async_helper/async_helper.dart';
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import '../helpers/compiler_helper.dart';
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const COMMON = r"""
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int g1 = 0, g2 = 0;
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int sink1 = 0, sink2 = 0;
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main() {
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for (int i = 0; i < 0x100000000; i = i + (i >> 4) + 1) {
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g1 = g2 = i;
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sink1 = callFoo(i, 1 - i, i);
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sink2 = callFoo(2 - i, i, 3 - i);
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}
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}
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""";
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const String TEST1 = r"""
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int foo(int param) {
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return (param & 0xFF0000) >> 16;
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// Shift mask reduction.
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// present: 'return param >>> 16 & 255;'
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// absent: 'FF0000'
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// absent: '16711680'
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}
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""";
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const String TEST2 = r"""
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int foo(int param) {
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param &= 0xFFFFFFFF;
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if (param == 0) return -1;
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return param << 0;
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// Shift-by-zero reduction.
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// present: 'return param;'
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}
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""";
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const String TEST3 = r"""
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int foo(int param) {
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param &= 0xFFFFFFFF;
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if (param == 0) return -1;
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return ((param >> 8) & 7) << 8;
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// Shift-mask-unshift reduction.
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// present: 'return param & 1792;'
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}
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""";
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const String TEST4 = r"""
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foo(int color) {
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int alpha = 100;
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int red = (color & 0xFF0000) >> 16;
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int green = (color & 0xFF00) >> 8;
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int blue = (color & 0xFF) >> 0;
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return (alpha & 255) << 24 |
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(red & 255) << 16 |
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(green & 255) << 8 |
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(blue & 255) << 0;
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// present: 'color & 16777215 | 1677721600'
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// absent: '<<'
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// absent: '>>'
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}
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""";
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main() {
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runTests() async {
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Future check(String test) {
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String program = COMMON + '\n\n' + test;
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if (!test.contains('callFoo')) {
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program += 'int callFoo(int a, int b, int c) => foo(a);\n';
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}
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return compile(program,
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entry: 'main',
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methodName: 'foo',
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disableTypeInference: false,
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check: checkerForAbsentPresent(test));
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}
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await check(TEST1);
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await check(TEST2);
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await check(TEST3);
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await check(TEST4);
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}
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asyncTest(() async {
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print('--test from kernel------------------------------------------------');
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await runTests();
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});
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}
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