1 /*
   2  * Copyright (c) 2013, 2015, 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 package org.graalvm.compiler.lir.aarch64;
  25 
  26 import static jdk.vm.ci.code.ValueUtil.asRegister;
  27 
  28 import org.graalvm.compiler.asm.aarch64.AArch64MacroAssembler;
  29 import org.graalvm.compiler.lir.LIRInstructionClass;
  30 import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
  31 
  32 import jdk.vm.ci.aarch64.AArch64Kind;
  33 import jdk.vm.ci.code.Register;
  34 import jdk.vm.ci.meta.AllocatableValue;
  35 
  36 /**
  37  * Instruction that reinterprets some bit pattern as a different type. It is possible to reinterpret
  38  * the following: - int <-> float - long <-> double
  39  */
  40 public class AArch64ReinterpretOp extends AArch64LIRInstruction {
  41     private static final LIRInstructionClass<AArch64ReinterpretOp> TYPE = LIRInstructionClass.create(AArch64ReinterpretOp.class);
  42 
  43     @Def protected AllocatableValue resultValue;
  44     @Use protected AllocatableValue inputValue;
  45 
  46     public AArch64ReinterpretOp(AllocatableValue resultValue, AllocatableValue inputValue) {
  47         super(TYPE);
  48         AArch64Kind from = (AArch64Kind) inputValue.getPlatformKind();
  49         AArch64Kind to = (AArch64Kind) resultValue.getPlatformKind();
  50         assert from.getSizeInBytes() == to.getSizeInBytes() && from.isInteger() ^ to.isInteger();
  51         this.resultValue = resultValue;
  52         this.inputValue = inputValue;
  53     }
  54 
  55     @Override
  56     public void emitCode(CompilationResultBuilder crb, AArch64MacroAssembler masm) {
  57         Register result = asRegister(resultValue);
  58         Register input = asRegister(inputValue);
  59         AArch64Kind to = (AArch64Kind) resultValue.getPlatformKind();
  60         final int size = to.getSizeInBytes() * Byte.SIZE;
  61         masm.fmov(size, result, input);
  62     }
  63 }