jdk8-mips64-public/hotspot: src/cpu/x86/vm/copy

6603011: RFE: Optimize long division
Summary: Transform long division by constant into multiply
Reviewed-by: never, kvn

     1 /*

     2  * Copyright 2003-2004 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    25 // Inline functions for memory copy and fill.

    27 // Contains inline asm implementations

    28 #include "incls/_copy_pd.inline.hpp.incl"

    30 static void pd_fill_to_words(HeapWord* tohw, size_t count, juint value) {

    31 #ifdef AMD64

    32   julong* to = (julong*) tohw;

    33   julong  v  = ((julong) value << 32) | value;

    34   while (count-- > 0) {

    35     *to++ = v;

    36   }

    37 #else

    38   juint* to = (juint*)tohw;

    39   count *= HeapWordSize / BytesPerInt;

    40   while (count-- > 0) {

    41     *to++ = value;

    42   }

    43 #endif // AMD64

    44 }

    46 static void pd_fill_to_aligned_words(HeapWord* tohw, size_t count, juint value) {

    47   pd_fill_to_words(tohw, count, value);

    48 }

    50 static void pd_fill_to_bytes(void* to, size_t count, jubyte value) {

    51   (void)memset(to, value, count);

    52 }

    54 static void pd_zero_to_words(HeapWord* tohw, size_t count) {

    55   pd_fill_to_words(tohw, count, 0);

    56 }

    58 static void pd_zero_to_bytes(void* to, size_t count) {

    59   (void)memset(to, 0, count);

    60 }

src/cpu/x86/vm/copy_x86.hpp@f3de1255b035