1 /* 2 * Copyright (C) 2015 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 public class Main { 19 public static int FIBCOUNT = 64; 20 public static int[] fibs; 21 22 /// CHECK-START-X86_64: int Main.test() disassembly (after) 23 /// CHECK-DAG: <<Zero:i\d+>> IntConstant 0 24 // 25 /// CHECK: If 26 /// CHECK-NEXT: cmp 27 /// CHECK-NEXT: jle/ng 28 // 29 /// CHECK-DAG: <<Fibs:l\d+>> StaticFieldGet 30 /// CHECK-DAG: NullCheck [<<Fibs>>] 31 /// CHECK-NOT: jmp 32 /// CHECK-DAG: <<FibsAtZero:i\d+>> ArrayGet [<<Fibs>>,<<Zero>>] 33 /// CHECK-DAG: Return [<<FibsAtZero>>] 34 // 35 // Checks that there is no conditional jump over a `jmp` 36 // instruction. The `ArrayGet` instruction is in the next block. 37 // 38 // Note that the `StaticFieldGet` HIR instruction above (captured as 39 // `Fibs`) can produce a `jmp` x86-64 instruction when read barriers 40 // are enabled (to jump into the read barrier slow path), which is 41 // different from the `jmp` in the `CHECK-NOT` assertion. test()42 public static int test() { 43 for (int i = 1; ; i++) { 44 if (i >= FIBCOUNT) { 45 return fibs[0]; 46 } 47 fibs[i] = (i + fibs[(i - 1)]); 48 } 49 } 50 main(String[] args)51 public static void main(String[] args) { 52 fibs = new int[FIBCOUNT]; 53 fibs[0] = 1; 54 test(); 55 } 56 } 57