content: /*
   * 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 last value of a few periodic sequences
   * (found by fuzz testing).
   */
  public class Main {
  
    /// CHECK-START: int Main.doitUpInt(int) loop_optimization (before)
    /// CHECK-DAG: <<Phi:i\d+>> Phi  loop:<<Loop:B\d+>> outer_loop:none
    /// CHECK-DAG:              Phi  loop:<<Loop>>      outer_loop:none
    //
    /// CHECK-START: int Main.doitUpInt(int) loop_optimization (after)
    /// CHECK-NOT: Phi
    static int doitUpInt(int n) {
      // Complete loop is replaced by last-value.
      int lI = 1;
      for (int i1 = 0; i1  < n; i1++) {
        lI = (1486662021 - lI);
      }
      return lI;
    }
  
    /// CHECK-START: int Main.doitDownInt(int) loop_optimization (before)
    /// CHECK-DAG: <<Phi:i\d+>> Phi  loop:<<Loop:B\d+>> outer_loop:none
    /// CHECK-DAG:              Phi  loop:<<Loop>>      outer_loop:none
    //
    /// CHECK-START: int Main.doitDownInt(int) loop_optimization (after)
    /// CHECK-NOT: Phi
    static int doitDownInt(int n) {
      // Complete loop is replaced by last-value.
      int lI = 1;
      for (int i1 = n - 1; i1 >= 0; i1--) {
        lI = (1486662021 - lI);
      }
      return lI;
    }
  
    /// CHECK-START: float Main.doitUpFloat(int) loop_optimization (before)
    /// CHECK-DAG: <<Phi:i\d+>> Phi  loop:<<Loop:B\d+>> outer_loop:none
    /// CHECK-DAG:              Phi  loop:<<Loop>>      outer_loop:none
    //
    /// CHECK-START: float Main.doitUpFloat(int) loop_optimization (after)
    /// CHECK-DAG: <<Phi:i\d+>> Phi  loop:<<Loop:B\d+>> outer_loop:none
    /// CHECK-DAG:              Phi  loop:<<Loop>>      outer_loop:none
    static float doitUpFloat(int n) {
      // FP arithmetic is not sufficiently precise.
      // The loop remains.
      float lF = 1.0f;
      for (int i1 = 0; i1  < n; i1++) {
        lF = (1486662021.0f - lF);
      }
      return lF;
    }
  
    /// CHECK-START: float Main.doitDownFloat(int) loop_optimization (before)
    /// CHECK-DAG: <<Phi:i\d+>> Phi  loop:<<Loop:B\d+>> outer_loop:none
    /// CHECK-DAG:              Phi  loop:<<Loop>>      outer_loop:none
    //
    /// CHECK-START: float Main.doitDownFloat(int) loop_optimization (after)
    /// CHECK-DAG: <<Phi:i\d+>> Phi  loop:<<Loop:B\d+>> outer_loop:none
    /// CHECK-DAG:              Phi  loop:<<Loop>>      outer_loop:none
    static float doitDownFloat(int n) {
      // FP arithmetic is not sufficiently precise.
      // The loop remains.
      float lF = 1.0f;
      for (int i1 = n - 1; i1 >= 0; i1--) {
        lF = (1486662021.0f - lF);
      }
      return lF;
    }
  
    /// CHECK-START: float Main.doitUpFloatAlt(int) loop_optimization (before)
    /// CHECK-DAG: <<Phi:i\d+>> Phi  loop:<<Loop:B\d+>> outer_loop:none
    /// CHECK-DAG:              Phi  loop:<<Loop>>      outer_loop:none
    //
    /// CHECK-START: float Main.doitUpFloatAlt(int) loop_optimization (after)
    /// CHECK-NOT: Phi
    static float doitUpFloatAlt(int n) {
      // Complete loop is replaced by last-value
      // since the values are now precise.
      float lF = 1.0f;
      float l2 = 1486662020.0f;
      for (int i1 = 0; i1  < n; i1++) {
        float old = lF;
        lF = l2;
        l2 = old;
      }
      return lF;
    }
  
    /// CHECK-START: float Main.doitDownFloatAlt(int) loop_optimization (before)
    /// CHECK-DAG: <<Phi:i\d+>> Phi  loop:<<Loop:B\d+>> outer_loop:none
    /// CHECK-DAG:              Phi  loop:<<Loop>>      outer_loop:none
    //
    /// CHECK-START: float Main.doitDownFloatAlt(int) loop_optimization (after)
    /// CHECK-NOT: Phi
    static float doitDownFloatAlt(int n) {
      // Complete loop is replaced by last-value
      // since the values are now precise.
      float lF = 1.0f;
      float l2 = 1486662020.0f;
      for (int i1 = n - 1; i1 >= 0; i1--) {
        float old = lF;
        lF = l2;
        l2 = old;
      }
      return lF;
    }
  
    // Main driver.
    public static void main(String[] args) {
      for (int i = 0; i < 10; i++) {
        int ei = (i & 1) == 0 ? 1 : 1486662020;
        int ci = doitUpInt(i);
        expectEquals(ei, ci);
      }
      for (int i = 0; i < 10; i++) {
        int ei = (i & 1) == 0 ? 1 : 1486662020;
        int ci = doitDownInt(i);
        expectEquals(ei, ci);
      }
      for (int i = 0; i < 10; i++) {
        float ef = i == 0 ? 1.0f : ((i & 1) == 0 ? 0.0f : 1486662021.0f);
        float cf = doitUpFloat(i);
        expectEquals(ef, cf);
      }
      for (int i = 0; i < 10; i++) {
        float ef = i == 0 ? 1.0f : ((i & 1) == 0 ? 0.0f : 1486662021.0f);
        float cf = doitDownFloat(i);
        expectEquals(ef, cf);
      }
      for (int i = 0; i < 10; i++) {
        float ef = (i & 1) == 0 ? 1.0f : 1486662020.0f;
        float cf = doitUpFloatAlt(i);
        expectEquals(ef, cf);
      }
      for (int i = 0; i < 10; i++) {
        float ef = (i & 1) == 0 ? 1.0f : 1486662020.0f;
        float cf = doitDownFloatAlt(i);
        expectEquals(ef, cf);
      }
      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(float expected, float result) {
      if (expected != result) {
        throw new Error("Expected: " + expected + ", found: " + result);
      }
    }
  }
  
  
  