1 /*
   2  * Copyright (c) 2016, 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 package org.graalvm.compiler.hotspot.replacements;
  24 
  25 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.arrayStart;
  26 
  27 import org.graalvm.compiler.api.directives.GraalDirectives;
  28 import org.graalvm.compiler.api.replacements.ClassSubstitution;
  29 import org.graalvm.compiler.api.replacements.MethodSubstitution;
  30 import org.graalvm.compiler.hotspot.HotSpotBackend;
  31 
  32 @ClassSubstitution(className = "java.math.BigInteger", optional = true)
  33 public class BigIntegerSubstitutions {
  34 
  35     @MethodSubstitution(isStatic = false)
  36     static int[] multiplyToLen(@SuppressWarnings("unused") Object receiver, int[] x, int xlen, int[] y, int ylen, int[] zIn) {
  37         return multiplyToLenStatic(x, xlen, y, ylen, zIn);
  38     }
  39 
  40     @MethodSubstitution(isStatic = true)
  41     static int[] multiplyToLenStatic(int[] x, int xlen, int[] y, int ylen, int[] zIn) {
  42         int[] zResult = zIn;
  43         int zLen;
  44         if (zResult == null || zResult.length < (xlen + ylen)) {
  45             zLen = xlen + ylen;
  46             zResult = new int[xlen + ylen];
  47         } else {
  48             zLen = zIn.length;
  49         }
  50         HotSpotBackend.multiplyToLenStub(arrayStart(x), xlen, arrayStart(y), ylen, arrayStart(zResult), zLen);
  51         return zResult;
  52     }
  53 
  54     @MethodSubstitution(isStatic = true)
  55     static int mulAdd(int[] out, int[] in, int offset, int len, int k) {
  56         int[] outNonNull = GraalDirectives.guardingNonNull(out);
  57         int newOffset = outNonNull.length - offset;
  58         return HotSpotBackend.mulAddStub(arrayStart(outNonNull), arrayStart(in), newOffset, len, k);
  59     }
  60 
  61     @MethodSubstitution(isStatic = true)
  62     static int implMulAdd(int[] out, int[] in, int offset, int len, int k) {
  63         int[] outNonNull = GraalDirectives.guardingNonNull(out);
  64         int newOffset = outNonNull.length - offset;
  65         return HotSpotBackend.mulAddStub(arrayStart(outNonNull), arrayStart(in), newOffset, len, k);
  66     }
  67 
  68     @MethodSubstitution(isStatic = true)
  69     static int[] implMontgomeryMultiply(int[] a, int[] b, int[] n, int len, long inv, int[] product) {
  70         HotSpotBackend.implMontgomeryMultiply(arrayStart(a), arrayStart(b), arrayStart(n), len, inv, arrayStart(product));
  71         return product;
  72 
  73     }
  74 
  75     @MethodSubstitution(isStatic = true)
  76     static int[] implMontgomerySquare(int[] a, int[] n, int len, long inv, int[] product) {
  77         HotSpotBackend.implMontgomerySquare(arrayStart(a), arrayStart(n), len, inv, arrayStart(product));
  78         return product;
  79     }
  80 
  81     @MethodSubstitution(isStatic = true)
  82     static int[] implSquareToLen(int[] x, int len, int[] z, int zLen) {
  83         HotSpotBackend.implSquareToLen(arrayStart(x), len, arrayStart(z), zLen);
  84         return z;
  85     }
  86 
  87 }