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/*
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* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package org.graalvm.compiler.replacements.amd64;
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import static org.graalvm.compiler.replacements.NodeIntrinsificationProvider.INJECTED_TARGET;
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import org.graalvm.compiler.api.replacements.ClassSubstitution;
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import org.graalvm.compiler.api.replacements.Fold;
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import org.graalvm.compiler.api.replacements.MethodSubstitution;
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import org.graalvm.compiler.core.common.SuppressFBWarnings;
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import org.graalvm.compiler.replacements.nodes.BitScanForwardNode;
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import org.graalvm.compiler.replacements.nodes.BitScanReverseNode;
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import jdk.vm.ci.amd64.AMD64;
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import jdk.vm.ci.code.TargetDescription;
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@ClassSubstitution(Integer.class)
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public class AMD64IntegerSubstitutions {
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@Fold
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static boolean lzcnt(@Fold.InjectedParameter TargetDescription target) {
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AMD64 arch = (AMD64) target.arch;
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return arch.getFeatures().contains(AMD64.CPUFeature.LZCNT) && arch.getFlags().contains(AMD64.Flag.UseCountLeadingZerosInstruction);
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}
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@Fold
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static boolean tzcnt(@Fold.InjectedParameter TargetDescription target) {
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AMD64 arch = (AMD64) target.arch;
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return arch.getFeatures().contains(AMD64.CPUFeature.BMI1) && arch.getFlags().contains(AMD64.Flag.UseCountTrailingZerosInstruction);
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}
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@MethodSubstitution
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@SuppressFBWarnings(value = "NP_NULL_PARAM_DEREF_NONVIRTUAL", justification = "foldable method parameters are injected")
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public static int numberOfLeadingZeros(int i) {
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if (lzcnt(INJECTED_TARGET)) {
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return AMD64CountLeadingZerosNode.countLeadingZeros(i);
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}
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if (i == 0) {
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return 32;
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}
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return 31 - BitScanReverseNode.unsafeScan(i);
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}
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@MethodSubstitution
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@SuppressFBWarnings(value = "NP_NULL_PARAM_DEREF_NONVIRTUAL", justification = "foldable method parameters are injected")
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public static int numberOfTrailingZeros(int i) {
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if (tzcnt(INJECTED_TARGET)) {
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return AMD64CountTrailingZerosNode.countTrailingZeros(i);
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}
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if (i == 0) {
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return 32;
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}
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return BitScanForwardNode.unsafeScan(i);
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}
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}
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