1 /*
   2  * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 
  25 package org.graalvm.compiler.hotspot.amd64.test;
  26 
  27 import org.junit.Test;
  28 import org.junit.Assert;
  29 
  30 /**
  31  * Tests Bit Manipulation Instruction blsi pattern matching and result.
  32  */
  33 public class BmiBlsi extends BmiCompilerTest {
  34     // from Intel manual VEX.NDD.LZ.0F38.W0 F3 /3, example c4e260f2c2
  35     private final byte[] instrMask = new byte[]{
  36                     (byte) 0xFF,
  37                     (byte) 0x1F,
  38                     (byte) 0x00,
  39                     (byte) 0xFF,
  40                     (byte) 0b0011_1000};
  41     private final byte[] instrPattern = new byte[]{
  42                     (byte) 0xC4, // prefix for 3-byte VEX instruction
  43                     (byte) 0x02, // 00010 implied 0F 38 leading opcode bytes
  44                     (byte) 0x00,
  45                     (byte) 0xF3,
  46                     (byte) 0b0001_1000}; // bits 543 == 011 (3)
  47 
  48     public int blsii(int n1) {
  49         return (n1 & (-n1));
  50     }
  51 
  52     public long blsil(long n1) {
  53         return (n1 & (-n1));
  54     }
  55 
  56     // Pattern matching check for blsii
  57     @Test
  58     public void test1() {
  59         Assert.assertTrue(verifyPositive("blsii", instrMask, instrPattern));
  60     }
  61 
  62     // Pattern matching check for blsil
  63     @Test
  64     public void test2() {
  65         Assert.assertTrue(verifyPositive("blsil", instrMask, instrPattern));
  66     }
  67 
  68     // Result correctness check
  69     @Test
  70     public void test3() {
  71         int n1 = 42;
  72         test("blsii", n1);
  73     }
  74 
  75     @Test
  76     public void test4() {
  77         long n1 = 420000000;
  78         test("blsil", n1);
  79     }
  80 }