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.lir.amd64;
  24 
  25 import static jdk.vm.ci.code.ValueUtil.asRegister;
  26 import static jdk.vm.ci.code.ValueUtil.isRegister;
  27 
  28 import java.util.BitSet;
  29 
  30 import org.graalvm.compiler.asm.amd64.AMD64MacroAssembler;
  31 import org.graalvm.compiler.lir.LIRInstructionClass;
  32 import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
  33 
  34 import jdk.vm.ci.amd64.AMD64;
  35 import jdk.vm.ci.code.Register;
  36 import jdk.vm.ci.code.RegisterValue;
  37 import jdk.vm.ci.meta.Value;
  38 
  39 public class AMD64VZeroUpper extends AMD64LIRInstruction {
  40 
  41     public static final LIRInstructionClass<AMD64VZeroUpper> TYPE = LIRInstructionClass.create(AMD64VZeroUpper.class);
  42 
  43     @Temp protected final RegisterValue[] xmmRegisters;
  44 
  45     public AMD64VZeroUpper(Value[] exclude) {
  46         super(TYPE);
  47         xmmRegisters = initRegisterValues(exclude);
  48     }
  49 
  50     private static RegisterValue[] initRegisterValues(Value[] exclude) {
  51         BitSet skippedRegs = new BitSet();
  52         int numSkipped = 0;
  53         if (exclude != null) {
  54             for (Value value : exclude) {
  55                 if (isRegister(value) && asRegister(value).getRegisterCategory().equals(AMD64.XMM)) {
  56                     skippedRegs.set(asRegister(value).number);
  57                     numSkipped++;
  58                 }
  59             }
  60         }
  61         RegisterValue[] regs = new RegisterValue[AMD64.xmmRegistersAVX512.length - numSkipped];
  62         for (int i = 0, j = 0; i < AMD64.xmmRegistersAVX512.length; i++) {
  63             Register reg = AMD64.xmmRegistersAVX512[i];
  64             if (!skippedRegs.get(reg.number)) {
  65                 regs[j++] = reg.asValue();
  66             }
  67         }
  68         return regs;
  69     }
  70 
  71     @Override
  72     public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler asm) {
  73         asm.vzeroupper();
  74     }
  75 }