xref: /aosp_15_r20/art/test/660-checker-simd-sad/src/SimdSadShort2.java (revision 795d594fd825385562da6b089ea9b2033f3abf5a)

/*
 * 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).
 *
 * Special case, char array that is first cast to short, forcing sign extension.
 */
public class SimdSadShort2 {

  // TODO: lower precision still coming, b/64091002

  private static short sadCastChar2Short(char[] s1, char[] s2) {
      int min_length = Math.min(s1.length, s2.length);
      short sad = 0;
      for (int i = 0; i < min_length; i++) {
          sad += Math.abs(((short) s1[i]) - ((short) s2[i]));
      }
      return sad;
  }

  private static short sadCastChar2ShortAlt(char[] s1, char[] s2) {
      int min_length = Math.min(s1.length, s2.length);
      short sad = 0;
      for (int i = 0; i < min_length; i++) {
          short s = (short) s1[i];
          short p = (short) s2[i];
          sad += s >= p ? s - p : p - s;
      }
      return sad;
  }

  private static short sadCastChar2ShortAlt2(char[] s1, char[] s2) {
      int min_length = Math.min(s1.length, s2.length);
      short sad = 0;
      for (int i = 0; i < min_length; i++) {
          short s = (short) s1[i];
          short p = (short) s2[i];
          int x = s - p;
          if (x < 0)
              x = -x;
          sad += x;
      }
      return sad;
  }

  /// CHECK-START: int SimdSadShort2.sadCastChar2Int(char[], char[]) instruction_simplifier (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: <<BC1:i\d+>>    BoundsCheck [<<Phi1>>,{{i\d+}}] loop:<<Loop>>     outer_loop:none
  /// CHECK-DAG: <<BC2:i\d+>>    BoundsCheck [<<Phi1>>,{{i\d+}}] loop:<<Loop>>     outer_loop:none
  /// CHECK-DAG: <<Get1:c\d+>>   ArrayGet [{{l\d+}},<<BC1>>]    loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Get2:c\d+>>   ArrayGet [{{l\d+}},<<BC2>>]    loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Cnv1:s\d+>>   TypeConversion [<<Get1>>]      loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Cnv2:s\d+>>   TypeConversion [<<Get2>>]      loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Sub:i\d+>>    Sub [<<Cnv1>>,<<Cnv2>>]        loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Abs:i\d+>>    Abs [<<Sub>>]                  loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG:                 Add [<<Phi2>>,<<Abs>>]         loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG:                 Add [<<Phi1>>,<<Cons1>>]       loop:<<Loop>>      outer_loop:none
  //
  /// CHECK-START: int SimdSadShort2.sadCastChar2Int(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:s\d+>>   ArrayGet [{{l\d+}},<<Phi1>>]   loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Get2:s\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: <<Abs:i\d+>>    Abs [<<Sub>>]                  loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG:                 Add [<<Phi2>>,<<Abs>>]         loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG:                 Add [<<Phi1>>,<<Cons1>>]       loop:<<Loop>>      outer_loop:none
  //
  /// CHECK-START-ARM64: int SimdSadShort2.sadCastChar2Int(char[], char[]) loop_optimization (after)
  /// CHECK-DAG: <<Cons0:i\d+>>  IntConstant 0                  loop:none
  /// CHECK-IF:     hasIsaFeature("sve") and os.environ.get('ART_FORCE_TRY_PREDICATED_SIMD') == 'true'
  //
  //      SAD idiom is not supported for SVE.
  ///     CHECK-NOT: VecSADAccumulate
  //
  /// CHECK-ELSE:
  //
  ///     CHECK-DAG: <<Cons8:i\d+>>  IntConstant 8                  loop:none
  ///     CHECK-DAG: <<Set:d\d+>>    VecSetScalars [<<Cons0>>]      loop:none
  ///     CHECK-DAG: <<Phi1:i\d+>>   Phi [<<Cons0>>,{{i\d+}}]       loop:<<Loop:B\d+>> outer_loop:none
  ///     CHECK-DAG: <<Phi2:d\d+>>   Phi [<<Set>>,{{d\d+}}]         loop:<<Loop>>      outer_loop:none
  ///     CHECK-DAG: <<Load1:d\d+>>  VecLoad [{{l\d+}},<<Phi1>>]    loop:<<Loop>>      outer_loop:none
  ///     CHECK-DAG: <<Load2:d\d+>>  VecLoad [{{l\d+}},<<Phi1>>]    loop:<<Loop>>      outer_loop:none
  ///     CHECK-DAG: <<SAD:d\d+>>    VecSADAccumulate [<<Phi2>>,<<Load1>>,<<Load2>>] loop:<<Loop>> outer_loop:none
  ///     CHECK-DAG:                 Add [<<Phi1>>,<<Cons8>>]       loop:<<Loop>>      outer_loop:none
  //
  /// CHECK-FI:
  private static int sadCastChar2Int(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(((short) s1[i]) - ((short) s2[i]));
      }
      return sad;
  }

  /// CHECK-START: int SimdSadShort2.sadCastChar2IntAlt(char[], char[]) instruction_simplifier (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: <<BC1:i\d+>>    BoundsCheck [<<Phi1>>,{{i\d+}}] loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<BC2:i\d+>>    BoundsCheck [<<Phi1>>,{{i\d+}}] loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Get1:c\d+>>   ArrayGet [{{l\d+}},<<BC1>>]    loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Get2:c\d+>>   ArrayGet [{{l\d+}},<<BC2>>]    loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Cnv1:s\d+>>   TypeConversion [<<Get1>>]      loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Cnv2:s\d+>>   TypeConversion [<<Get2>>]      loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Sub1:i\d+>>   Sub [<<Cnv2>>,<<Cnv1>>]        loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Sub2:i\d+>>   Sub [<<Cnv1>>,<<Cnv2>>]        loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Phi3:i\d+>>   Phi [<<Sub2>>,<<Sub1>>]        loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG:                 Add [<<Phi2>>,<<Phi3>>]        loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG:                 Add [<<Phi1>>,<<Cons1>>]       loop:<<Loop>>      outer_loop:none
  //
  /// CHECK-START: int SimdSadShort2.sadCastChar2IntAlt(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:s\d+>>   ArrayGet [{{l\d+}},<<Phi1>>]   loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Get2:s\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-ARM64: int SimdSadShort2.sadCastChar2IntAlt(char[], char[]) loop_optimization (after)
  /// CHECK-DAG: <<Cons0:i\d+>>  IntConstant 0                  loop:none
  /// CHECK-IF:     hasIsaFeature("sve") and os.environ.get('ART_FORCE_TRY_PREDICATED_SIMD') == 'true'
  //
  //      SAD idiom is not supported for SVE.
  ///     CHECK-NOT: VecSADAccumulate
  //
  /// CHECK-ELSE:
  //
  ///     CHECK-DAG: <<Cons8:i\d+>>  IntConstant 8                  loop:none
  ///     CHECK-DAG: <<Set:d\d+>>    VecSetScalars [<<Cons0>>]      loop:none
  ///     CHECK-DAG: <<Phi1:i\d+>>   Phi [<<Cons0>>,{{i\d+}}]       loop:<<Loop:B\d+>> outer_loop:none
  ///     CHECK-DAG: <<Phi2:d\d+>>   Phi [<<Set>>,{{d\d+}}]         loop:<<Loop>>      outer_loop:none
  ///     CHECK-DAG: <<Load1:d\d+>>  VecLoad [{{l\d+}},<<Phi1>>]    loop:<<Loop>>      outer_loop:none
  ///     CHECK-DAG: <<Load2:d\d+>>  VecLoad [{{l\d+}},<<Phi1>>]    loop:<<Loop>>      outer_loop:none
  ///     CHECK-DAG: <<SAD:d\d+>>    VecSADAccumulate [<<Phi2>>,<<Load2>>,<<Load1>>] loop:<<Loop>> outer_loop:none
  ///     CHECK-DAG:                 Add [<<Phi1>>,<<Cons8>>]       loop:<<Loop>>      outer_loop:none
  //
  /// CHECK-FI:
  private static int sadCastChar2IntAlt(char[] s1, char[] s2) {
      int min_length = Math.min(s1.length, s2.length);
      int sad = 0;
      for (int i = 0; i < min_length; i++) {
          short s = (short) s1[i];
          short p = (short) s2[i];
          sad += s >= p ? s - p : p - s;
      }
      return sad;
  }

  /// CHECK-START: int SimdSadShort2.sadCastChar2IntAlt2(char[], char[]) instruction_simplifier (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: <<BC1:i\d+>>    BoundsCheck [<<Phi1>>,{{i\d+}}] loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<BC2:i\d+>>    BoundsCheck [<<Phi1>>,{{i\d+}}] loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Get1:c\d+>>   ArrayGet [{{l\d+}},<<BC1>>]    loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Get2:c\d+>>   ArrayGet [{{l\d+}},<<BC2>>]    loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Cnv1:s\d+>>   TypeConversion [<<Get1>>]      loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Cnv2:s\d+>>   TypeConversion [<<Get2>>]      loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Sub:i\d+>>    Sub [<<Cnv1>>,<<Cnv2>>]        loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Neg:i\d+>>    Neg [<<Sub>>]                  loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Phi3:i\d+>>   Phi [<<Sub>>,<<Neg>>]          loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG:                 Add [<<Phi2>>,<<Phi3>>]        loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG:                 Add [<<Phi1>>,<<Cons1>>]       loop:<<Loop>>      outer_loop:none
  //
  /// CHECK-START: int SimdSadShort2.sadCastChar2IntAlt2(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:s\d+>>   ArrayGet [{{l\d+}},<<Phi1>>]   loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Get2:s\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-ARM64: int SimdSadShort2.sadCastChar2IntAlt2(char[], char[]) loop_optimization (after)
  /// CHECK-DAG: <<Cons0:i\d+>>  IntConstant 0                  loop:none
  /// CHECK-IF:     hasIsaFeature("sve") and os.environ.get('ART_FORCE_TRY_PREDICATED_SIMD') == 'true'
  //
  //      SAD idiom is not supported for SVE.
  ///     CHECK-NOT: VecSADAccumulate
  //
  /// CHECK-ELSE:
  //
  ///     CHECK-DAG: <<Cons8:i\d+>>  IntConstant 8                  loop:none
  ///     CHECK-DAG: <<Set:d\d+>>    VecSetScalars [<<Cons0>>]      loop:none
  ///     CHECK-DAG: <<Phi1:i\d+>>   Phi [<<Cons0>>,{{i\d+}}]       loop:<<Loop:B\d+>> outer_loop:none
  ///     CHECK-DAG: <<Phi2:d\d+>>   Phi [<<Set>>,{{d\d+}}]         loop:<<Loop>>      outer_loop:none
  ///     CHECK-DAG: <<Load1:d\d+>>  VecLoad [{{l\d+}},<<Phi1>>]    loop:<<Loop>>      outer_loop:none
  ///     CHECK-DAG: <<Load2:d\d+>>  VecLoad [{{l\d+}},<<Phi1>>]    loop:<<Loop>>      outer_loop:none
  ///     CHECK-DAG: <<SAD:d\d+>>    VecSADAccumulate [<<Phi2>>,<<Load1>>,<<Load2>>] loop:<<Loop>> outer_loop:none
  ///     CHECK-DAG:                 Add [<<Phi1>>,<<Cons8>>]       loop:<<Loop>>      outer_loop:none
  //
  /// CHECK-FI:
  private static int sadCastChar2IntAlt2(char[] s1, char[] s2) {
      int min_length = Math.min(s1.length, s2.length);
      int sad = 0;
      for (int i = 0; i < min_length; i++) {
          short s = (short) s1[i];
          short p = (short) s2[i];
          int x = s - p;
          if (x < 0)
              x = -x;
          sad += x;
      }
      return sad;
  }

  /// CHECK-START: long SimdSadShort2.sadCastChar2Long(char[], char[]) instruction_simplifier (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: <<BC1:i\d+>>    BoundsCheck [<<Phi1>>,{{i\d+}}] loop:<<Loop>>     outer_loop:none
  /// CHECK-DAG: <<BC2:i\d+>>    BoundsCheck [<<Phi1>>,{{i\d+}}] loop:<<Loop>>     outer_loop:none
  /// CHECK-DAG: <<Get1:c\d+>>   ArrayGet [{{l\d+}},<<BC1>>]    loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Get2:c\d+>>   ArrayGet [{{l\d+}},<<BC2>>]    loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Cnv1:s\d+>>   TypeConversion [<<Get1>>]      loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Cnv2:s\d+>>   TypeConversion [<<Get2>>]      loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Cnv3:j\d+>>   TypeConversion [<<Cnv1>>]      loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Cnv4:j\d+>>   TypeConversion [<<Cnv2>>]      loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Sub:j\d+>>    Sub [<<Cnv3>>,<<Cnv4>>]        loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Abs:j\d+>>    Abs [<<Sub>>]                  loop:<<Loop>> outer_loop:none
  /// CHECK-DAG:                 Add [<<Phi2>>,<<Abs>>]         loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG:                 Add [<<Phi1>>,<<Cons1>>]       loop:<<Loop>>      outer_loop:none
  //
  /// CHECK-START: long SimdSadShort2.sadCastChar2Long(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:s\d+>>   ArrayGet [{{l\d+}},<<Phi1>>]   loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Get2:s\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: <<Abs:j\d+>>    Abs [<<Sub>>]                  loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG:                 Add [<<Phi2>>,<<Abs>>]         loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG:                 Add [<<Phi1>>,<<Cons1>>]       loop:<<Loop>>      outer_loop:none
  //
  /// CHECK-START-ARM64: long SimdSadShort2.sadCastChar2Long(char[], char[]) loop_optimization (after)
  /// CHECK-DAG: <<Cons0:i\d+>>  IntConstant 0                  loop:none
  /// CHECK-DAG: <<ConsL:j\d+>>  LongConstant 0                 loop:none
  /// CHECK-IF:     hasIsaFeature("sve") and os.environ.get('ART_FORCE_TRY_PREDICATED_SIMD') == 'true'
  //
  //      SAD idiom is not supported for SVE.
  ///     CHECK-NOT: VecSADAccumulate
  //
  /// CHECK-ELSE:
  //
  ///     CHECK-DAG: <<Cons8:i\d+>>  IntConstant 8                  loop:none
  ///     CHECK-DAG: <<Set:d\d+>>    VecSetScalars [<<ConsL>>]      loop:none
  ///     CHECK-DAG: <<Phi1:i\d+>>   Phi [<<Cons0>>,{{i\d+}}]       loop:<<Loop:B\d+>> outer_loop:none
  ///     CHECK-DAG: <<Phi2:d\d+>>   Phi [<<Set>>,{{d\d+}}]         loop:<<Loop>>      outer_loop:none
  ///     CHECK-DAG: <<Load1:d\d+>>  VecLoad [{{l\d+}},<<Phi1>>]    loop:<<Loop>>      outer_loop:none
  ///     CHECK-DAG: <<Load2:d\d+>>  VecLoad [{{l\d+}},<<Phi1>>]    loop:<<Loop>>      outer_loop:none
  ///     CHECK-DAG: <<SAD:d\d+>>    VecSADAccumulate [<<Phi2>>,<<Load1>>,<<Load2>>] loop:<<Loop>> outer_loop:none
  ///     CHECK-DAG:                 Add [<<Phi1>>,<<Cons8>>]       loop:<<Loop>>      outer_loop:none
  //
  /// CHECK-FI:
  private static long sadCastChar2Long(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 = (short) s1[i];
          long y = (short) s2[i];
          sad += Math.abs(x - y);
      }
      return sad;
  }

  /// CHECK-START: long SimdSadShort2.sadCastChar2LongAt1(char[], char[]) instruction_simplifier (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: <<BC1:i\d+>>    BoundsCheck [<<Phi1>>,{{i\d+}}] loop:<<Loop>>     outer_loop:none
  /// CHECK-DAG: <<BC2:i\d+>>    BoundsCheck [<<Phi1>>,{{i\d+}}] loop:<<Loop>>     outer_loop:none
  /// CHECK-DAG: <<Get1:c\d+>>   ArrayGet [{{l\d+}},<<BC1>>]    loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Get2:c\d+>>   ArrayGet [{{l\d+}},<<BC2>>]    loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Cnv1:s\d+>>   TypeConversion [<<Get1>>]      loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Cnv2:s\d+>>   TypeConversion [<<Get2>>]      loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Cnv3:j\d+>>   TypeConversion [<<Cnv1>>]      loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Cnv4:j\d+>>   TypeConversion [<<Cnv2>>]      loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Sub:j\d+>>    Sub [<<Cnv3>>,<<Cnv4>>]        loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Abs:j\d+>>    Abs [<<Sub>>]                  loop:<<Loop>> outer_loop:none
  /// CHECK-DAG:                 Add [<<Phi2>>,<<Abs>>]         loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG:                 Add [<<Phi1>>,<<Cons1>>]       loop:<<Loop>>      outer_loop:none
  //
  /// CHECK-START: long SimdSadShort2.sadCastChar2LongAt1(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:s\d+>>   ArrayGet [{{l\d+}},<<Phi1>>]   loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: <<Get2:s\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: <<Abs:j\d+>>    Abs [<<Sub>>]                  loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG:                 Add [<<Phi2>>,<<Abs>>]         loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG:                 Add [<<Phi1>>,<<Cons1>>]       loop:<<Loop>>      outer_loop:none
  //
  /// CHECK-START-ARM64: long SimdSadShort2.sadCastChar2LongAt1(char[], char[]) loop_optimization (after)
  /// CHECK-DAG: <<Cons0:i\d+>>  IntConstant 0                  loop:none
  /// CHECK-DAG: <<ConsL:j\d+>>  LongConstant 1                 loop:none
  /// CHECK-IF:     hasIsaFeature("sve") and os.environ.get('ART_FORCE_TRY_PREDICATED_SIMD') == 'true'
  //
  //      SAD idiom is not supported for SVE.
  ///     CHECK-NOT: VecSADAccumulate
  //
  /// CHECK-ELSE:
  //
  ///     CHECK-DAG: <<Cons8:i\d+>>  IntConstant 8                  loop:none
  ///     CHECK-DAG: <<Set:d\d+>>    VecSetScalars [<<ConsL>>]      loop:none
  ///     CHECK-DAG: <<Phi1:i\d+>>   Phi [<<Cons0>>,{{i\d+}}]       loop:<<Loop:B\d+>> outer_loop:none
  ///     CHECK-DAG: <<Phi2:d\d+>>   Phi [<<Set>>,{{d\d+}}]         loop:<<Loop>>      outer_loop:none
  ///     CHECK-DAG: <<Load1:d\d+>>  VecLoad [{{l\d+}},<<Phi1>>]    loop:<<Loop>>      outer_loop:none
  ///     CHECK-DAG: <<Load2:d\d+>>  VecLoad [{{l\d+}},<<Phi1>>]    loop:<<Loop>>      outer_loop:none
  ///     CHECK-DAG: <<SAD:d\d+>>    VecSADAccumulate [<<Phi2>>,<<Load1>>,<<Load2>>] loop:<<Loop>> outer_loop:none
  ///     CHECK-DAG:                 Add [<<Phi1>>,<<Cons8>>]       loop:<<Loop>>      outer_loop:none
  //
  /// CHECK-FI:
  private static long sadCastChar2LongAt1(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 = (short) s1[i];
          long y = (short) s2[i];
          sad += Math.abs(x - y);
      }
      return sad;
  }

  public static void main() {
    // 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, sadCastChar2Short(s1, s2));
    expectEquals(-1, sadCastChar2Short(s2, s1));
    expectEquals(-1, sadCastChar2ShortAlt(s1, s2));
    expectEquals(-1, sadCastChar2ShortAlt(s2, s1));
    expectEquals(-1, sadCastChar2ShortAlt2(s1, s2));
    expectEquals(-1, sadCastChar2ShortAlt2(s2, s1));
    expectEquals(65535, sadCastChar2Int(s1, s2));
    expectEquals(65535, sadCastChar2Int(s2, s1));
    expectEquals(65535, sadCastChar2IntAlt(s1, s2));
    expectEquals(65535, sadCastChar2IntAlt(s2, s1));
    expectEquals(65535, sadCastChar2IntAlt2(s1, s2));
    expectEquals(65535, sadCastChar2IntAlt2(s2, s1));
    expectEquals(65535L, sadCastChar2Long(s1, s2));
    expectEquals(65535L, sadCastChar2Long(s2, s1));
    expectEquals(65536L, sadCastChar2LongAt1(s1, s2));
    expectEquals(65536L, sadCastChar2LongAt1(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(-18932, sadCastChar2Short(s1, s2));
    expectEquals(-18932, sadCastChar2ShortAlt(s1, s2));
    expectEquals(-18932, sadCastChar2ShortAlt2(s1, s2));
    expectEquals(1291788, sadCastChar2Int(s1, s2));
    expectEquals(1291788, sadCastChar2IntAlt(s1, s2));
    expectEquals(1291788, sadCastChar2IntAlt2(s1, s2));
    expectEquals(1291788L, sadCastChar2Long(s1, s2));
    expectEquals(1291789L, sadCastChar2LongAt1(s1, s2));

    System.out.println("SimdSadShort2 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);
    }
  }
}