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/*
* 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 SadLong {
/// CHECK-START: long SadLong.sad1(long, long) instruction_simplifier$after_gvn (before)
/// CHECK-DAG: <<Select:j\d+>> Select
/// CHECK-DAG: Return [<<Select>>]
//
/// CHECK-START: long SadLong.sad1(long, long) instruction_simplifier$after_gvn (after)
/// CHECK-DAG: <<Select:j\d+>> Select
/// CHECK-DAG: Return [<<Select>>]
//
/// CHECK-START: long SadLong.sad1(long, long) instruction_simplifier$after_gvn (after)
/// CHECK-NOT: Abs
//
// NOTE: for direct 64-bit operands, this is not an ABS.
static long sad1(long x, long y) {
return x >= y ? x - y : y - x;
}
/// CHECK-START: long SadLong.sad2(long, long) instruction_simplifier$after_gvn (before)
/// CHECK-DAG: <<Select:j\d+>> Select
/// CHECK-DAG: Return [<<Select>>]
//
/// CHECK-START: long SadLong.sad2(long, long) instruction_simplifier$after_gvn (after)
/// CHECK-DAG: <<Intrin:j\d+>> Abs
/// CHECK-DAG: Return [<<Intrin>>]
static long sad2(long x, long y) {
long diff = x - y;
if (diff < 0) diff = -diff;
return diff;
}
/// CHECK-START: long SadLong.sad3(long, long) instruction_simplifier$after_gvn (before)
/// CHECK-DAG: <<Select:j\d+>> Select
/// CHECK-DAG: Return [<<Select>>]
//
/// CHECK-START: long SadLong.sad3(long, long) instruction_simplifier$after_gvn (after)
/// CHECK-DAG: <<Intrin:j\d+>> Abs
/// CHECK-DAG: Return [<<Intrin>>]
static long sad3(long x, long y) {
long diff = x - y;
return diff >= 0 ? diff : -diff;
}
/// CHECK-START: long SadLong.sad3Alt(long, long) instruction_simplifier$after_gvn (before)
/// CHECK-DAG: <<Select:j\d+>> Select
/// CHECK-DAG: Return [<<Select>>]
//
/// CHECK-START: long SadLong.sad3Alt(long, long) instruction_simplifier$after_gvn (after)
/// CHECK-DAG: <<Intrin:j\d+>> Abs
/// CHECK-DAG: Return [<<Intrin>>]
static long sad3Alt(long x, long y) {
long diff = x - y;
return 0 <= diff ? diff : -diff;
}
public static void main() {
// Use cross-values for the interesting values.
long[] interesting = {
0x0000000000000000L, 0x0000000000000001L, 0x000000007fffffffL,
0x0000000080000000L, 0x0000000080000001L, 0x00000000ffffffffL,
0x0000000100000000L, 0x0000000100000001L, 0x000000017fffffffL,
0x0000000180000000L, 0x0000000180000001L, 0x00000001ffffffffL,
0x7fffffff00000000L, 0x7fffffff00000001L, 0x7fffffff7fffffffL,
0x7fffffff80000000L, 0x7fffffff80000001L, 0x7fffffffffffffffL,
0x8000000000000000L, 0x8000000000000001L, 0x800000007fffffffL,
0x8000000080000000L, 0x8000000080000001L, 0x80000000ffffffffL,
0x8000000100000000L, 0x8000000100000001L, 0x800000017fffffffL,
0x8000000180000000L, 0x8000000180000001L, 0x80000001ffffffffL,
0xffffffff00000000L, 0xffffffff00000001L, 0xffffffff7fffffffL,
0xffffffff80000000L, 0xffffffff80000001L, 0xffffffffffffffffL
};
for (int i = 0; i < interesting.length; i++) {
for (int j = 0; j < interesting.length; j++) {
long x = interesting[i];
long y = interesting[j];
long e1 = x >= y ? x - y : y - x; // still select
expectEquals(e1, sad1(x, y));
long e2 = Math.abs(x - y); // pure abs
expectEquals(e2, sad2(x, y));
expectEquals(e2, sad3(x, y));
expectEquals(e2, sad3Alt(x, y));
}
}
System.out.println("SadLong passed");
}
private static void expectEquals(long expected, long result) {
if (expected != result) {
throw new Error("Expected: " + expected + ", found: " + result);
}
}
}