1 /*
   2  * Copyright (c) 1997, 2006, 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  */
  24 
  25 #include "incls/_precompiled.incl"
  26 #include "incls/_regmask.cpp.incl"













  27 
  28 #define RM_SIZE _RM_SIZE /* a constant private to the class RegMask */
  29 
  30 //-------------Non-zero bit search methods used by RegMask---------------------
  31 // Find lowest 1, or return 32 if empty
  32 int find_lowest_bit( uint32 mask ) {
  33   int n = 0;
  34   if( (mask & 0xffff) == 0 ) {
  35     mask >>= 16;
  36     n += 16;
  37   }
  38   if( (mask & 0xff) == 0 ) {
  39     mask >>= 8;
  40     n += 8;
  41   }
  42   if( (mask & 0xf) == 0 ) {
  43     mask >>= 4;
  44     n += 4;
  45   }
  46   if( (mask & 0x3) == 0 ) {

   1 /*
   2  * Copyright (c) 1997, 2010, 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  */
  24 
  25 #include "precompiled.hpp"
  26 #include "opto/compile.hpp"
  27 #include "opto/regmask.hpp"
  28 #ifdef TARGET_ARCH_MODEL_x86_32
  29 # include "adfiles/ad_x86_32.hpp"
  30 #endif
  31 #ifdef TARGET_ARCH_MODEL_x86_64
  32 # include "adfiles/ad_x86_64.hpp"
  33 #endif
  34 #ifdef TARGET_ARCH_MODEL_sparc
  35 # include "adfiles/ad_sparc.hpp"
  36 #endif
  37 #ifdef TARGET_ARCH_MODEL_zero
  38 # include "adfiles/ad_zero.hpp"
  39 #endif
  40 
  41 #define RM_SIZE _RM_SIZE /* a constant private to the class RegMask */
  42 
  43 //-------------Non-zero bit search methods used by RegMask---------------------
  44 // Find lowest 1, or return 32 if empty
  45 int find_lowest_bit( uint32 mask ) {
  46   int n = 0;
  47   if( (mask & 0xffff) == 0 ) {
  48     mask >>= 16;
  49     n += 16;
  50   }
  51   if( (mask & 0xff) == 0 ) {
  52     mask >>= 8;
  53     n += 8;
  54   }
  55   if( (mask & 0xf) == 0 ) {
  56     mask >>= 4;
  57     n += 4;
  58   }
  59   if( (mask & 0x3) == 0 ) {