/*
 * Copyright (c) 2017, Oracle and/or its affiliates.
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of
 * conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other materials provided
 * with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors may be used to
 * endorse or promote products derived from this software without specific prior written
 * permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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 */
package com.oracle.truffle.llvm.runtime.memory;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
import com.oracle.truffle.llvm.runtime.LLVMAddress;

public class LLVMProfiledMemSet {
    protected static final long MAX_JAVA_LEN = 256;

    @CompilationFinal private boolean inJava = true;

    public void memset(LLVMAddress address, byte value, long length) {
        if (inJava) {
            if (length <= MAX_JAVA_LEN) {
                long current = address.getVal();
                long i64ValuesToWrite = length >> 3;
                if (CompilerDirectives.injectBranchProbability(CompilerDirectives.LIKELY_PROBABILITY, i64ValuesToWrite > 0)) {
                    long v16 = ((long) value) << 8 | ((long) value & 0xFF);
                    long v32 = v16 << 16 | v16;
                    long v64 = v32 << 32 | v32;

                    for (int i = 0; CompilerDirectives.injectBranchProbability(CompilerDirectives.LIKELY_PROBABILITY, i < i64ValuesToWrite); i++) {
                        LLVMMemory.putI64(current, v64);
                        current += 8;
                    }
                }

                long i8ValuesToWrite = length & 0x07;
                for (int i = 0; CompilerDirectives.injectBranchProbability(CompilerDirectives.LIKELY_PROBABILITY, i < i8ValuesToWrite); i++) {
                    LLVMMemory.putI8(current, value);
                    current++;
                }
                return;
            } else {
                CompilerDirectives.transferToInterpreterAndInvalidate();
                inJava = false;
            }
        }

        nativeMemSet(address, value, length);
    }

    @SuppressWarnings("deprecation")
    private static void nativeMemSet(LLVMAddress address, byte value, long length) {
        LLVMMemory.memset(address, length, value);
    }
}