jdk8-mips64-public/hotspot: src/cpu/x86/vm/assembler_x86

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

     1 /*

     2  * Copyright 2003-2005 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 void Assembler::emit_long64(jlong x) {

    26   *(jlong*) _code_pos = x;

    27   _code_pos += sizeof(jlong);

    28   code_section()->set_end(_code_pos);

    29 }

    31 inline void MacroAssembler::pd_patch_instruction(address branch, address target) {

    32   unsigned char op = branch[0];

    33   assert(op == 0xE8 /* call */ ||

    34          op == 0xE9 /* jmp */ ||

    35          op == 0xEB /* short jmp */ ||

    36          (op & 0xF0) == 0x70 /* short jcc */ ||

    37          op == 0x0F && (branch[1] & 0xF0) == 0x80 /* jcc */,

    38          "Invalid opcode at patch point");

    40   if (op == 0xEB || (op & 0xF0) == 0x70) {

    41     // short offset operators (jmp and jcc)

    42     char* disp = (char*) &branch[1];

    43     int imm8 = target - (address) &disp[1];

    44     guarantee(this->is8bit(imm8), "Short forward jump exceeds 8-bit offset");

    45     *disp = imm8;

    46   } else {

    47     int* disp = (int*) &branch[(op == 0x0F)? 2: 1];

    48     int imm32 = target - (address) &disp[1];

    49     *disp = imm32;

    50   }

    51 }

    53 #ifndef PRODUCT

    54 inline void MacroAssembler::pd_print_patched_instruction(address branch) {

    55   const char* s;

    56   unsigned char op = branch[0];

    57   if (op == 0xE8) {

    58     s = "call";

    59   } else if (op == 0xE9 || op == 0xEB) {

    60     s = "jmp";

    61   } else if ((op & 0xF0) == 0x70) {

    62     s = "jcc";

    63   } else if (op == 0x0F) {

    64     s = "jcc";

    65   } else {

    66     s = "????";

    67   }

    68   tty->print("%s (unresolved)", s);

    69 }

    70 #endif // ndef PRODUCT

    72 inline void MacroAssembler::movptr(Address dst, intptr_t src) {

    73 #ifdef _LP64

    74   Assembler::mov64(dst, src);

    75 #else

    76   Assembler::movl(dst, src);

    77 #endif // _LP64

    78 }

    80 inline void MacroAssembler::movptr(Register dst, intptr_t src) {

    81 #ifdef _LP64

    82   Assembler::mov64(dst, src);

    83 #else

    84   Assembler::movl(dst, src);

    85 #endif // _LP64

    86 }

src/cpu/x86/vm/assembler_x86_64.inline.hpp@f3de1255b035