jdk8-mips64-public/hotspot: src/share/vm/opto/regmask.cpp@f90c822e73f8 (annotated)

src/share/vm/opto/regmask.cpp@f90c822e73f8 (annotated)

src/share/vm/opto/regmask.cpp

Wed, 27 Apr 2016 01:25:04 +0800

author: aoqi
date: Wed, 27 Apr 2016 01:25:04 +0800
changeset 0: f90c822e73f8
child 1: 2d8a650513c2
permissions: -rw-r--r--

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http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

 /*
  * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "opto/compile.hpp"
 #include "opto/regmask.hpp"
 #ifdef TARGET_ARCH_MODEL_x86_32
 # include "adfiles/ad_x86_32.hpp"
 #endif
 #ifdef TARGET_ARCH_MODEL_x86_64
 # include "adfiles/ad_x86_64.hpp"
 #endif
 #ifdef TARGET_ARCH_MODEL_sparc
 # include "adfiles/ad_sparc.hpp"
 #endif
 #ifdef TARGET_ARCH_MODEL_zero
 # include "adfiles/ad_zero.hpp"
 #endif
 #ifdef TARGET_ARCH_MODEL_arm
 # include "adfiles/ad_arm.hpp"
 #endif
 #ifdef TARGET_ARCH_MODEL_ppc_32
 # include "adfiles/ad_ppc_32.hpp"
 #endif
 #ifdef TARGET_ARCH_MODEL_ppc_64
 # include "adfiles/ad_ppc_64.hpp"
 #endif
 #define RM_SIZE _RM_SIZE /* a constant private to the class RegMask */
 //-------------Non-zero bit search methods used by RegMask---------------------
 // Find lowest 1, or return 32 if empty
 int find_lowest_bit( uint32 mask ) {
   int n = 0;
   if( (mask & 0xffff) == 0 ) {
     mask >>= 16;
     n += 16;
   }
   if( (mask & 0xff) == 0 ) {
     mask >>= 8;
     n += 8;
   }
   if( (mask & 0xf) == 0 ) {
     mask >>= 4;
     n += 4;
   }
   if( (mask & 0x3) == 0 ) {
     mask >>= 2;
     n += 2;
   }
   if( (mask & 0x1) == 0 ) {
     mask >>= 1;
      n += 1;
   }
   if( mask == 0 ) {
     n = 32;
   }
   return n;
 }
 // Find highest 1, or return 32 if empty
 int find_hihghest_bit( uint32 mask ) {
   int n = 0;
   if( mask > 0xffff ) {
     mask >>= 16;
     n += 16;
   }
   if( mask > 0xff ) {
     mask >>= 8;
     n += 8;
   }
   if( mask > 0xf ) {
     mask >>= 4;
     n += 4;
   }
   if( mask > 0x3 ) {
     mask >>= 2;
     n += 2;
   }
   if( mask > 0x1 ) {
     mask >>= 1;
     n += 1;
   }
   if( mask == 0 ) {
     n = 32;
   }
   return n;
 }
 //------------------------------dump-------------------------------------------
 #ifndef PRODUCT
 void OptoReg::dump(int r, outputStream *st) {
   switch (r) {
   case Special: st->print("r---"); break;
   case Bad:     st->print("rBAD"); break;
   default:
     if (r < _last_Mach_Reg) st->print("%s", Matcher::regName[r]);
     else st->print("rS%d",r);
     break;
   }
 }
 #endif
 //=============================================================================
 const RegMask RegMask::Empty(
 # define BODY(I) 0,
   FORALL_BODY
 # undef BODY
 
 );
 //=============================================================================
 bool RegMask::is_vector(uint ireg) {
   return (ireg == Op_VecS || ireg == Op_VecD || ireg == Op_VecX || ireg == Op_VecY);
 }
 int RegMask::num_registers(uint ireg) {
     switch(ireg) {
       case Op_VecY:
         return 8;
       case Op_VecX:
         return 4;
       case Op_VecD:
       case Op_RegD:
       case Op_RegL:
 #ifdef _LP64
       case Op_RegP:
 #endif
         return 2;
     }
     // Op_VecS and the rest ideal registers.
     return 1;
 }
 //------------------------------find_first_pair--------------------------------
 // Find the lowest-numbered register pair in the mask.  Return the
 // HIGHEST register number in the pair, or BAD if no pairs.
 OptoReg::Name RegMask::find_first_pair() const {
   verify_pairs();
   for( int i = 0; i < RM_SIZE; i++ ) {
     if( _A[i] ) {               // Found some bits
       int bit = _A[i] & -_A[i]; // Extract low bit
       // Convert to bit number, return hi bit in pair
       return OptoReg::Name((i<<_LogWordBits)+find_lowest_bit(bit)+1);
     }
   }
   return OptoReg::Bad;
 }
 //------------------------------ClearToPairs-----------------------------------
 // Clear out partial bits; leave only bit pairs
 void RegMask::clear_to_pairs() {
   for( int i = 0; i < RM_SIZE; i++ ) {
     int bits = _A[i];
     bits &= ((bits & 0x55555555)<<1); // 1 hi-bit set for each pair
     bits |= (bits>>1);          // Smear 1 hi-bit into a pair
     _A[i] = bits;
   }
   verify_pairs();
 }
 //------------------------------SmearToPairs-----------------------------------
 // Smear out partial bits; leave only bit pairs
 void RegMask::smear_to_pairs() {
   for( int i = 0; i < RM_SIZE; i++ ) {
     int bits = _A[i];
     bits |= ((bits & 0x55555555)<<1); // Smear lo bit hi per pair
     bits |= ((bits & 0xAAAAAAAA)>>1); // Smear hi bit lo per pair
     _A[i] = bits;
   }
   verify_pairs();
 }
 //------------------------------is_aligned_pairs-------------------------------
 bool RegMask::is_aligned_pairs() const {
   // Assert that the register mask contains only bit pairs.
   for( int i = 0; i < RM_SIZE; i++ ) {
     int bits = _A[i];
     while( bits ) {             // Check bits for pairing
       int bit = bits & -bits;   // Extract low bit
       // Low bit is not odd means its mis-aligned.
       if( (bit & 0x55555555) == 0 ) return false;
       bits -= bit;              // Remove bit from mask
       // Check for aligned adjacent bit
       if( (bits & (bit<<1)) == 0 ) return false;
       bits -= (bit<<1);         // Remove other halve of pair
     }
   }
   return true;
 }
 //------------------------------is_bound1--------------------------------------
 // Return TRUE if the mask contains a single bit
 int RegMask::is_bound1() const {
   if( is_AllStack() ) return false;
   int bit = -1;                 // Set to hold the one bit allowed
   for( int i = 0; i < RM_SIZE; i++ ) {
     if( _A[i] ) {               // Found some bits
       if( bit != -1 ) return false; // Already had bits, so fail
       bit = _A[i] & -_A[i];     // Extract 1 bit from mask
       if( bit != _A[i] ) return false; // Found many bits, so fail
     }
   }
   // True for both the empty mask and for a single bit
   return true;
 }
 //------------------------------is_bound2--------------------------------------
 // Return TRUE if the mask contains an adjacent pair of bits and no other bits.
 int RegMask::is_bound_pair() const {
   if( is_AllStack() ) return false;
   int bit = -1;                 // Set to hold the one bit allowed
   for( int i = 0; i < RM_SIZE; i++ ) {
     if( _A[i] ) {               // Found some bits
       if( bit != -1 ) return false; // Already had bits, so fail
       bit = _A[i] & -(_A[i]);   // Extract 1 bit from mask
       if( (bit << 1) != 0 ) {   // Bit pair stays in same word?
         if( (bit | (bit<<1)) != _A[i] )
           return false;         // Require adjacent bit pair and no more bits
       } else {                  // Else its a split-pair case
         if( bit != _A[i] ) return false; // Found many bits, so fail
         i++;                    // Skip iteration forward
         if( i >= RM_SIZE || _A[i] != 1 )
           return false; // Require 1 lo bit in next word
       }
     }
   }
   // True for both the empty mask and for a bit pair
   return true;
 }
 static int low_bits[3] = { 0x55555555, 0x11111111, 0x01010101 };
 //------------------------------find_first_set---------------------------------
 // Find the lowest-numbered register set in the mask.  Return the
 // HIGHEST register number in the set, or BAD if no sets.
 // Works also for size 1.
 OptoReg::Name RegMask::find_first_set(const int size) const {
   verify_sets(size);
   for (int i = 0; i < RM_SIZE; i++) {
     if (_A[i]) {                // Found some bits
       int bit = _A[i] & -_A[i]; // Extract low bit
       // Convert to bit number, return hi bit in pair
       return OptoReg::Name((i<<_LogWordBits)+find_lowest_bit(bit)+(size-1));
     }
   }
   return OptoReg::Bad;
 }
 //------------------------------clear_to_sets----------------------------------
 // Clear out partial bits; leave only aligned adjacent bit pairs
 void RegMask::clear_to_sets(const int size) {
   if (size == 1) return;
   assert(2 <= size && size <= 8, "update low bits table");
   assert(is_power_of_2(size), "sanity");
   int low_bits_mask = low_bits[size>>2];
   for (int i = 0; i < RM_SIZE; i++) {
     int bits = _A[i];
     int sets = (bits & low_bits_mask);
     for (int j = 1; j < size; j++) {
       sets = (bits & (sets<<1)); // filter bits which produce whole sets
     }
     sets |= (sets>>1);           // Smear 1 hi-bit into a set
     if (size > 2) {
       sets |= (sets>>2);         // Smear 2 hi-bits into a set
       if (size > 4) {
         sets |= (sets>>4);       // Smear 4 hi-bits into a set
       }
     }
     _A[i] = sets;
   }
   verify_sets(size);
 }
 //------------------------------smear_to_sets----------------------------------
 // Smear out partial bits to aligned adjacent bit sets
 void RegMask::smear_to_sets(const int size) {
   if (size == 1) return;
   assert(2 <= size && size <= 8, "update low bits table");
   assert(is_power_of_2(size), "sanity");
   int low_bits_mask = low_bits[size>>2];
   for (int i = 0; i < RM_SIZE; i++) {
     int bits = _A[i];
     int sets = 0;
     for (int j = 0; j < size; j++) {
       sets |= (bits & low_bits_mask);  // collect partial bits
       bits  = bits>>1;
     }
     sets |= (sets<<1);           // Smear 1 lo-bit  into a set
     if (size > 2) {
       sets |= (sets<<2);         // Smear 2 lo-bits into a set
       if (size > 4) {
         sets |= (sets<<4);       // Smear 4 lo-bits into a set
       }
     }
     _A[i] = sets;
   }
   verify_sets(size);
 }
 //------------------------------is_aligned_set--------------------------------
 bool RegMask::is_aligned_sets(const int size) const {
   if (size == 1) return true;
   assert(2 <= size && size <= 8, "update low bits table");
   assert(is_power_of_2(size), "sanity");
   int low_bits_mask = low_bits[size>>2];
   // Assert that the register mask contains only bit sets.
   for (int i = 0; i < RM_SIZE; i++) {
     int bits = _A[i];
     while (bits) {              // Check bits for pairing
       int bit = bits & -bits;   // Extract low bit
       // Low bit is not odd means its mis-aligned.
       if ((bit & low_bits_mask) == 0) return false;
       // Do extra work since (bit << size) may overflow.
       int hi_bit = bit << (size-1); // high bit
       int set = hi_bit + ((hi_bit-1) & ~(bit-1));
       // Check for aligned adjacent bits in this set
       if ((bits & set) != set) return false;
       bits -= set;  // Remove this set
     }
   }
   return true;
 }
 //------------------------------is_bound_set-----------------------------------
 // Return TRUE if the mask contains one adjacent set of bits and no other bits.
 // Works also for size 1.
 int RegMask::is_bound_set(const int size) const {
   if( is_AllStack() ) return false;
   assert(1 <= size && size <= 8, "update low bits table");
   int bit = -1;                 // Set to hold the one bit allowed
   for (int i = 0; i < RM_SIZE; i++) {
     if (_A[i] ) {               // Found some bits
       if (bit != -1)
        return false;            // Already had bits, so fail
       bit = _A[i] & -_A[i];     // Extract low bit from mask
       int hi_bit = bit << (size-1); // high bit
       if (hi_bit != 0) {        // Bit set stays in same word?
         int set = hi_bit + ((hi_bit-1) & ~(bit-1));
         if (set != _A[i])
           return false;         // Require adjacent bit set and no more bits
       } else {                  // Else its a split-set case
         if (((-1) & ~(bit-1)) != _A[i])
           return false;         // Found many bits, so fail
         i++;                    // Skip iteration forward and check high part
         // The lower 24 bits should be 0 since it is split case and size <= 8.
         int set = bit>>24;
         set = set & -set; // Remove sign extension.
         set = (((set << size) - 1) >> 8);
         if (i >= RM_SIZE || _A[i] != set)
           return false; // Require expected low bits in next word
       }
     }
   }
   // True for both the empty mask and for a bit set
   return true;
 }
 //------------------------------is_UP------------------------------------------
 // UP means register only, Register plus stack, or stack only is DOWN
 bool RegMask::is_UP() const {
   // Quick common case check for DOWN (any stack slot is legal)
   if( is_AllStack() )
     return false;
   // Slower check for any stack bits set (also DOWN)
   if( overlap(Matcher::STACK_ONLY_mask) )
     return false;
   // Not DOWN, so must be UP
   return true;
 }
 //------------------------------Size-------------------------------------------
 // Compute size of register mask in bits
 uint RegMask::Size() const {
   extern uint8 bitsInByte[256];
   uint sum = 0;
   for( int i = 0; i < RM_SIZE; i++ )
     sum +=
       bitsInByte[(_A[i]>>24) & 0xff] +
       bitsInByte[(_A[i]>>16) & 0xff] +
       bitsInByte[(_A[i]>> 8) & 0xff] +
       bitsInByte[ _A[i]      & 0xff];
   return sum;
 }
 #ifndef PRODUCT
 //------------------------------print------------------------------------------
 void RegMask::dump(outputStream *st) const {
   st->print("[");
   RegMask rm = *this;           // Structure copy into local temp
   OptoReg::Name start = rm.find_first_elem(); // Get a register
   if (OptoReg::is_valid(start)) { // Check for empty mask
     rm.Remove(start);           // Yank from mask
     OptoReg::dump(start, st);   // Print register
     OptoReg::Name last = start;
     // Now I have printed an initial register.
     // Print adjacent registers as "rX-rZ" instead of "rX,rY,rZ".
     // Begin looping over the remaining registers.
     while (1) {                 //
       OptoReg::Name reg = rm.find_first_elem(); // Get a register
       if (!OptoReg::is_valid(reg))
         break;                  // Empty mask, end loop
       rm.Remove(reg);           // Yank from mask
       if (last+1 == reg) {      // See if they are adjacent
         // Adjacent registers just collect into long runs, no printing.
         last = reg;
       } else {                  // Ending some kind of run
         if (start == last) {    // 1-register run; no special printing
         } else if (start+1 == last) {
           st->print(",");       // 2-register run; print as "rX,rY"
           OptoReg::dump(last, st);
         } else {                // Multi-register run; print as "rX-rZ"
           st->print("-");
           OptoReg::dump(last, st);
         }
         st->print(",");         // Seperate start of new run
         start = last = reg;     // Start a new register run
         OptoReg::dump(start, st); // Print register
       } // End of if ending a register run or not
     } // End of while regmask not empty
     if (start == last) {        // 1-register run; no special printing
     } else if (start+1 == last) {
       st->print(",");           // 2-register run; print as "rX,rY"
       OptoReg::dump(last, st);
     } else {                    // Multi-register run; print as "rX-rZ"
       st->print("-");
       OptoReg::dump(last, st);
     }
     if (rm.is_AllStack()) st->print("...");
   }
   st->print("]");
 }
 #endif

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/opto/regmask.cpp@f90c822e73f8 (annotated)

src/share/vm/opto/regmask.cpp