1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 /** 18 * Tests for SAD (sum of absolute differences). 19 */ 20 public class Main { 21 22 /// CHECK-START: long Main.sad1(long, long) instruction_simplifier$after_gvn (before) 23 /// CHECK-DAG: <<Select:j\d+>> Select 24 /// CHECK-DAG: Return [<<Select>>] 25 // 26 /// CHECK-START: long Main.sad1(long, long) instruction_simplifier$after_gvn (after) 27 /// CHECK-DAG: <<Select:j\d+>> Select 28 /// CHECK-DAG: Return [<<Select>>] 29 // 30 /// CHECK-START: long Main.sad1(long, long) instruction_simplifier$after_gvn (after) 31 /// CHECK-NOT: Abs 32 // 33 // NOTE: for direct 64-bit operands, this is not an ABS. 34 static long sad1(long x, long y) { 35 return x >= y ? x - y : y - x; 36 } 37 38 /// CHECK-START: long Main.sad2(long, long) instruction_simplifier$after_gvn (before) 39 /// CHECK-DAG: <<Select:j\d+>> Select 40 /// CHECK-DAG: Return [<<Select>>] 41 // 42 /// CHECK-START: long Main.sad2(long, long) instruction_simplifier$after_gvn (after) 43 /// CHECK-DAG: <<Intrin:j\d+>> Abs 44 /// CHECK-DAG: Return [<<Intrin>>] 45 static long sad2(long x, long y) { 46 long diff = x - y; 47 if (diff < 0) diff = -diff; 48 return diff; 49 } 50 51 /// CHECK-START: long Main.sad3(long, long) instruction_simplifier$after_gvn (before) 52 /// CHECK-DAG: <<Select:j\d+>> Select 53 /// CHECK-DAG: Return [<<Select>>] 54 // 55 /// CHECK-START: long Main.sad3(long, long) instruction_simplifier$after_gvn (after) 56 /// CHECK-DAG: <<Intrin:j\d+>> Abs 57 /// CHECK-DAG: Return [<<Intrin>>] 58 static long sad3(long x, long y) { 59 long diff = x - y; 60 return diff >= 0 ? diff : -diff; 61 } 62 63 /// CHECK-START: long Main.sad3Alt(long, long) instruction_simplifier$after_gvn (before) 64 /// CHECK-DAG: <<Select:j\d+>> Select 65 /// CHECK-DAG: Return [<<Select>>] 66 // 67 /// CHECK-START: long Main.sad3Alt(long, long) instruction_simplifier$after_gvn (after) 68 /// CHECK-DAG: <<Intrin:j\d+>> Abs 69 /// CHECK-DAG: Return [<<Intrin>>] 70 static long sad3Alt(long x, long y) { 71 long diff = x - y; 72 return 0 <= diff ? diff : -diff; 73 } 74 75 public static void main(String[] args) { 76 // Use cross-values for the interesting values. 77 long[] interesting = { 78 0x0000000000000000L, 0x0000000000000001L, 0x000000007fffffffL, 79 0x0000000080000000L, 0x0000000080000001L, 0x00000000ffffffffL, 80 0x0000000100000000L, 0x0000000100000001L, 0x000000017fffffffL, 81 0x0000000180000000L, 0x0000000180000001L, 0x00000001ffffffffL, 82 0x7fffffff00000000L, 0x7fffffff00000001L, 0x7fffffff7fffffffL, 83 0x7fffffff80000000L, 0x7fffffff80000001L, 0x7fffffffffffffffL, 84 0x8000000000000000L, 0x8000000000000001L, 0x800000007fffffffL, 85 0x8000000080000000L, 0x8000000080000001L, 0x80000000ffffffffL, 86 0x8000000100000000L, 0x8000000100000001L, 0x800000017fffffffL, 87 0x8000000180000000L, 0x8000000180000001L, 0x80000001ffffffffL, 88 0xffffffff00000000L, 0xffffffff00000001L, 0xffffffff7fffffffL, 89 0xffffffff80000000L, 0xffffffff80000001L, 0xffffffffffffffffL 90 }; 91 for (int i = 0; i < interesting.length; i++) { 92 for (int j = 0; j < interesting.length; j++) { 93 long x = interesting[i]; 94 long y = interesting[j]; 95 long e1 = x >= y ? x - y : y - x; // still select 96 expectEquals(e1, sad1(x, y)); 97 long e2 = Math.abs(x - y); // pure abs 98 expectEquals(e2, sad2(x, y)); 99 expectEquals(e2, sad3(x, y)); 100 expectEquals(e2, sad3Alt(x, y)); 101 } 102 } 103 System.out.println("passed"); 104 } 105 106 private static void expectEquals(long expected, long result) { 107 if (expected != result) { 108 throw new Error("Expected: " + expected + ", found: " + result); 109 } 110 } 111 } 112
