/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Tests for SAD (sum of absolute differences).
*/
public class Main {
// TODO: lower precision still coming, b/64091002
// TODO: consider unsigned SAD too, b/64091002
private static char sadChar2Char(char[] s1, char[] s2) {
int min_length = Math.min(s1.length, s2.length);
char sad = 0;
for (int i = 0; i < min_length; i++) {
sad += Math.abs(s1[i] - s2[i]);
}
return sad;
}
private static char sadChar2CharAlt(char[] s1, char[] s2) {
int min_length = Math.min(s1.length, s2.length);
char sad = 0;
for (int i = 0; i < min_length; i++) {
char s = s1[i];
char p = s2[i];
sad += s >= p ? s - p : p - s;
}
return sad;
}
private static char sadChar2CharAlt2(char[] s1, char[] s2) {
int min_length = Math.min(s1.length, s2.length);
char sad = 0;
for (int i = 0; i < min_length; i++) {
char s = s1[i];
char p = s2[i];
int x = s - p;
if (x < 0) x = -x;
sad += x;
}
return sad;
}
/// CHECK-START: int Main.sadChar2Int(char[], char[]) loop_optimization (before)
/// CHECK-DAG: <<Cons0:i\d+>> IntConstant 0 loop:none
/// CHECK-DAG: <<Cons1:i\d+>> IntConstant 1 loop:none
/// CHECK-DAG: <<Phi2:i\d+>> Phi [<<Cons0>>,{{i\d+}}] loop:<<Loop:B\d+>> outer_loop:none
/// CHECK-DAG: <<Phi1:i\d+>> Phi [<<Cons0>>,{{i\d+}}] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: <<Get1:c\d+>> ArrayGet [{{l\d+}},<<Phi1>>] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: <<Get2:c\d+>> ArrayGet [{{l\d+}},<<Phi1>>] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: <<Sub:i\d+>> Sub [<<Get1>>,<<Get2>>] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: <<Intrin:i\d+>> Abs [<<Sub>>] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: Add [<<Phi2>>,<<Intrin>>] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: Add [<<Phi1>>,<<Cons1>>] loop:<<Loop>> outer_loop:none
//
/// CHECK-START: int Main.sadChar2Int(char[], char[]) loop_optimization (after)
/// CHECK-NOT: VecSADAccumulate
private static int sadChar2Int(char[] s1, char[] s2) {
int min_length = Math.min(s1.length, s2.length);
int sad = 0;
for (int i = 0; i < min_length; i++) {
sad += Math.abs(s1[i] - s2[i]);
}
return sad;
}
/// CHECK-START: int Main.sadChar2IntAlt(char[], char[]) loop_optimization (before)
/// CHECK-DAG: <<Cons0:i\d+>> IntConstant 0 loop:none
/// CHECK-DAG: <<Cons1:i\d+>> IntConstant 1 loop:none
/// CHECK-DAG: <<Phi2:i\d+>> Phi [<<Cons0>>,{{i\d+}}] loop:<<Loop:B\d+>> outer_loop:none
/// CHECK-DAG: <<Phi1:i\d+>> Phi [<<Cons0>>,{{i\d+}}] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: <<Get1:c\d+>> ArrayGet [{{l\d+}},<<Phi1>>] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: <<Get2:c\d+>> ArrayGet [{{l\d+}},<<Phi1>>] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: <<Sub:i\d+>> Sub [<<Get2>>,<<Get1>>] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: <<Intrin:i\d+>> Abs [<<Sub>>] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: Add [<<Phi2>>,<<Intrin>>] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: Add [<<Phi1>>,<<Cons1>>] loop:<<Loop>> outer_loop:none
//
/// CHECK-START: int Main.sadChar2IntAlt(char[], char[]) loop_optimization (after)
/// CHECK-NOT: VecSADAccumulate
private static int sadChar2IntAlt(char[] s1, char[] s2) {
int min_length = Math.min(s1.length, s2.length);
int sad = 0;
for (int i = 0; i < min_length; i++) {
char s = s1[i];
char p = s2[i];
sad += s >= p ? s - p : p - s;
}
return sad;
}
/// CHECK-START: int Main.sadChar2IntAlt2(char[], char[]) loop_optimization (before)
/// CHECK-DAG: <<Cons0:i\d+>> IntConstant 0 loop:none
/// CHECK-DAG: <<Cons1:i\d+>> IntConstant 1 loop:none
/// CHECK-DAG: <<Phi2:i\d+>> Phi [<<Cons0>>,{{i\d+}}] loop:<<Loop:B\d+>> outer_loop:none
/// CHECK-DAG: <<Phi1:i\d+>> Phi [<<Cons0>>,{{i\d+}}] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: <<Get1:c\d+>> ArrayGet [{{l\d+}},<<Phi1>>] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: <<Get2:c\d+>> ArrayGet [{{l\d+}},<<Phi1>>] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: <<Sub:i\d+>> Sub [<<Get1>>,<<Get2>>] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: <<Intrin:i\d+>> Abs [<<Sub>>] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: Add [<<Phi2>>,<<Intrin>>] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: Add [<<Phi1>>,<<Cons1>>] loop:<<Loop>> outer_loop:none
//
/// CHECK-START: int Main.sadChar2IntAlt2(char[], char[]) loop_optimization (after)
/// CHECK-NOT: VecSADAccumulate
private static int sadChar2IntAlt2(char[] s1, char[] s2) {
int min_length = Math.min(s1.length, s2.length);
int sad = 0;
for (int i = 0; i < min_length; i++) {
char s = s1[i];
char p = s2[i];
int x = s - p;
if (x < 0) x = -x;
sad += x;
}
return sad;
}
/// CHECK-START: long Main.sadChar2Long(char[], char[]) loop_optimization (before)
/// CHECK-DAG: <<Cons0:i\d+>> IntConstant 0 loop:none
/// CHECK-DAG: <<Cons1:i\d+>> IntConstant 1 loop:none
/// CHECK-DAG: <<ConsL:j\d+>> LongConstant 0 loop:none
/// CHECK-DAG: <<Phi1:i\d+>> Phi [<<Cons0>>,{{i\d+}}] loop:<<Loop:B\d+>> outer_loop:none
/// CHECK-DAG: <<Phi2:j\d+>> Phi [<<ConsL>>,{{j\d+}}] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: <<Get1:c\d+>> ArrayGet [{{l\d+}},<<Phi1>>] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: <<Get2:c\d+>> ArrayGet [{{l\d+}},<<Phi1>>] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: <<Cnv1:j\d+>> TypeConversion [<<Get1>>] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: <<Cnv2:j\d+>> TypeConversion [<<Get2>>] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: <<Sub:j\d+>> Sub [<<Cnv1>>,<<Cnv2>>] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: <<Intrin:j\d+>> Abs [<<Sub>>] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: Add [<<Phi2>>,<<Intrin>>] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: Add [<<Phi1>>,<<Cons1>>] loop:<<Loop>> outer_loop:none
//
/// CHECK-START: long Main.sadChar2Long(char[], char[]) loop_optimization (after)
/// CHECK-NOT: VecSADAccumulate
private static long sadChar2Long(char[] s1, char[] s2) {
int min_length = Math.min(s1.length, s2.length);
long sad = 0;
for (int i = 0; i < min_length; i++) {
long x = s1[i];
long y = s2[i];
sad += Math.abs(x - y);
}
return sad;
}
/// CHECK-START: long Main.sadChar2LongAt1(char[], char[]) loop_optimization (before)
/// CHECK-DAG: <<Cons0:i\d+>> IntConstant 0 loop:none
/// CHECK-DAG: <<Cons1:i\d+>> IntConstant 1 loop:none
/// CHECK-DAG: <<ConsL:j\d+>> LongConstant 1 loop:none
/// CHECK-DAG: <<Phi1:i\d+>> Phi [<<Cons0>>,{{i\d+}}] loop:<<Loop:B\d+>> outer_loop:none
/// CHECK-DAG: <<Phi2:j\d+>> Phi [<<ConsL>>,{{j\d+}}] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: <<Get1:c\d+>> ArrayGet [{{l\d+}},<<Phi1>>] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: <<Get2:c\d+>> ArrayGet [{{l\d+}},<<Phi1>>] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: <<Cnv1:j\d+>> TypeConversion [<<Get1>>] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: <<Cnv2:j\d+>> TypeConversion [<<Get2>>] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: <<Sub:j\d+>> Sub [<<Cnv1>>,<<Cnv2>>] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: <<Intrin:j\d+>> Abs [<<Sub>>] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: Add [<<Phi2>>,<<Intrin>>] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: Add [<<Phi1>>,<<Cons1>>] loop:<<Loop>> outer_loop:none
//
/// CHECK-START: long Main.sadChar2LongAt1(char[], char[]) loop_optimization (after)
/// CHECK-NOT: VecSADAccumulate
private static long sadChar2LongAt1(char[] s1, char[] s2) {
int min_length = Math.min(s1.length, s2.length);
long sad = 1; // starts at 1
for (int i = 0; i < min_length; i++) {
long x = s1[i];
long y = s2[i];
sad += Math.abs(x - y);
}
return sad;
}
public static void main(String[] args) {
// Cross-test the two most extreme values individually.
char[] s1 = { 0, 0x8000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
char[] s2 = { 0, 0x7fff, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
expectEquals(1, sadChar2Char(s1, s2));
expectEquals(1, sadChar2Char(s2, s1));
expectEquals(1, sadChar2CharAlt(s1, s2));
expectEquals(1, sadChar2CharAlt(s2, s1));
expectEquals(1, sadChar2CharAlt2(s1, s2));
expectEquals(1, sadChar2CharAlt2(s2, s1));
expectEquals(1, sadChar2Int(s1, s2));
expectEquals(1, sadChar2Int(s2, s1));
expectEquals(1, sadChar2IntAlt(s1, s2));
expectEquals(1, sadChar2IntAlt(s2, s1));
expectEquals(1, sadChar2IntAlt2(s1, s2));
expectEquals(1, sadChar2IntAlt2(s2, s1));
expectEquals(1L, sadChar2Long(s1, s2));
expectEquals(1L, sadChar2Long(s2, s1));
expectEquals(2L, sadChar2LongAt1(s1, s2));
expectEquals(2L, sadChar2LongAt1(s2, s1));
// Use cross-values to test all cases.
char[] interesting = {
(char) 0x0000,
(char) 0x0001,
(char) 0x0002,
(char) 0x1234,
(char) 0x8000,
(char) 0x8001,
(char) 0x7fff,
(char) 0xffff
};
int n = interesting.length;
int m = n * n + 1;
s1 = new char[m];
s2 = new char[m];
int k = 0;
for (int i = 0; i < n; i++) {
for (int j = 0; j < n; j++) {
s1[k] = interesting[i];
s2[k] = interesting[j];
k++;
}
}
s1[k] = 10;
s2[k] = 2;
expectEquals(56196, sadChar2Char(s1, s2));
expectEquals(56196, sadChar2CharAlt(s1, s2));
expectEquals(56196, sadChar2CharAlt2(s1, s2));
expectEquals(1497988, sadChar2Int(s1, s2));
expectEquals(1497988, sadChar2IntAlt(s1, s2));
expectEquals(1497988, sadChar2IntAlt2(s1, s2));
expectEquals(1497988L, sadChar2Long(s1, s2));
expectEquals(1497989L, sadChar2LongAt1(s1, s2));
System.out.println("passed");
}
private static void expectEquals(int expected, int result) {
if (expected != result) {
throw new Error("Expected: " + expected + ", found: " + result);
}
}
private static void expectEquals(long expected, long result) {
if (expected != result) {
throw new Error("Expected: " + expected + ", found: " + result);
}
}
}