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-rw-r--r--base/compression/lzss_compression.cc166
-rw-r--r--base/compression/lzss_compression.hh100
-rw-r--r--base/compression/null_compression.hh72
-rw-r--r--base/hybrid_pred.cc273
-rw-r--r--base/hybrid_pred.hh203
-rw-r--r--base/loader/aout_object.cc (renamed from base/aout_object.cc)0
-rw-r--r--base/loader/aout_object.hh (renamed from base/aout_object.hh)0
-rw-r--r--base/loader/coff_sym.h (renamed from base/coff_sym.h)0
-rw-r--r--base/loader/coff_symconst.h (renamed from base/coff_symconst.h)0
-rw-r--r--base/loader/ecoff_object.cc (renamed from base/ecoff_object.cc)0
-rw-r--r--base/loader/ecoff_object.hh (renamed from base/ecoff_object.hh)0
-rw-r--r--base/loader/elf_object.cc (renamed from base/elf_object.cc)0
-rw-r--r--base/loader/elf_object.hh (renamed from base/elf_object.hh)0
-rw-r--r--base/loader/exec_aout.h (renamed from base/exec_aout.h)0
-rw-r--r--base/loader/exec_ecoff.h (renamed from base/exec_ecoff.h)0
-rw-r--r--base/loader/object_file.cc (renamed from base/object_file.cc)0
-rw-r--r--base/loader/object_file.hh (renamed from base/object_file.hh)0
-rw-r--r--base/loader/symtab.cc (renamed from base/symtab.cc)0
-rw-r--r--base/loader/symtab.hh (renamed from base/symtab.hh)0
-rw-r--r--base/predictor.hh62
-rw-r--r--base/sat_counter.cc269
-rw-r--r--base/sat_counter.hh192
22 files changed, 1337 insertions, 0 deletions
diff --git a/base/compression/lzss_compression.cc b/base/compression/lzss_compression.cc
new file mode 100644
index 000000000..a1933215a
--- /dev/null
+++ b/base/compression/lzss_compression.cc
@@ -0,0 +1,166 @@
+/*
+ * Copyright (c) 2003 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * 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;
+ * neither the name of the copyright holders 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
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @file
+ * LZSSCompression definitions.
+ */
+
+#include <assert.h>
+
+#include "lzss_compression.hh"
+
+#include "misc.hh" //for fatal
+
+int
+LZSSCompression::findSubString(uint8_t *src, int front, int back, int size)
+{
+ int subSize = 0;
+ int max_length = 2048;
+ if (size - back < max_length) {
+ max_length = size - back;
+ }
+ for (int i = 0; i < max_length; ++i) {
+ if (src[front+i] != src[back+i]) {
+ return subSize;
+ }
+ ++subSize;
+ }
+ return subSize;
+}
+
+int
+LZSSCompression::emitByte(uint8_t *dest, uint8_t byte)
+{
+ if ((byte >> 5 & 0x7) == 0 || (byte >> 5 & 0x7) == 7) {
+ // If the top 3 bits are the same, emit 00<6bits>
+ dest[0] = byte & 0x3f;
+ return 1;
+ } else {
+ // emit 01XXXXXX <8 bits>
+ dest[0] = 0x40;
+ dest[1] = byte;
+ return 2;
+ }
+}
+
+void
+LZSSCompression::emitString(uint8_t *dest, uint16_t P, uint16_t L)
+{
+ // Emit 1<7P> <5P><3L> <8L>
+ dest[0] = 1<<7 | (P >> 5 & 0x7f);
+ dest[1] = ((P & 0x1f) << 3) | (L>>8 & 0x3);
+ dest[2] = L & 0xFF;
+}
+
+int
+LZSSCompression::compress(uint8_t *dest, uint8_t *src, int size)
+{
+ if (size > 4096) {
+ fatal("Compression can only handle block sizes of 4096 bytes or less");
+ }
+
+ // Encode the first byte.
+ int dest_index = emitByte(dest, src[0]);
+ int i = 1;
+ // A 11 bit field
+ uint16_t L;
+ // A 12 bit field
+ uint16_t P = 0;
+
+ while (i < size && dest_index < size) {
+ L = 0;
+
+ if (dest_index+3 >= size) {
+ dest_index = size;
+ continue;
+ }
+
+ if (i == size - 1) {
+ // Output the character
+ dest_index += emitByte(&dest[dest_index], src[i]);
+ ++i;
+ continue;
+ }
+ for (int j = 0; j < i; ++j) {
+ int sub_size = findSubString(src, j, i, size);
+ if (sub_size >= L) {
+ L = sub_size;
+ P = j;
+ }
+ }
+ if (L > 1) {
+ // Output the string reference
+ emitString(&dest[dest_index], P, L);
+ dest_index += 3;
+ i = i+L;
+ } else {
+ // Output the character
+ dest_index += emitByte(&dest[dest_index], src[i]);
+ ++i;
+ }
+ }
+
+ if (dest_index >= size) {
+ // Have expansion instead of compression, just copy.
+ memcpy(dest,src,size);
+ return size;
+ }
+ return dest_index;
+}
+
+int
+LZSSCompression::uncompress(uint8_t *dest, uint8_t *src, int size)
+{
+ int index = 0;
+ int i = 0;
+ while (i < size) {
+ if (src[i] & 1<<7 ) {
+ // We have a string
+ // Extract P
+ int start = (src[i] & 0x3f)<<5 | ((src[i+1] >> 3) & 0x1f);
+ // Extract L
+ int len = (src[i+1] & 0x07)<<8 | src[i+2];
+ i += 3;
+ for (int j = start; j < start+len; ++j) {
+ dest[index++] = dest[j];
+ }
+ } else {
+ // We have a character
+ if (src[i] & 1<<6) {
+ // Value is in the next byte
+ dest[index++] = src[i+1];
+ i += 2;
+ } else {
+ // just extend the lower 6 bits
+ dest[index++] = (src[i] & 0x3f) | ((src[i] & 1<<5) ? 0xC0 : 0);
+ ++i;
+ }
+ }
+ }
+ return index;
+}
diff --git a/base/compression/lzss_compression.hh b/base/compression/lzss_compression.hh
new file mode 100644
index 000000000..5fb47d3f1
--- /dev/null
+++ b/base/compression/lzss_compression.hh
@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 2003 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * 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;
+ * neither the name of the copyright holders 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
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __LZSS_COMPRESSION_HH__
+#define __LZSS_COMPRESSION_HH__
+
+/** @file
+ * LZSSCompression declarations.
+ */
+
+#include "host.hh" // for uint8_t
+
+/**
+ * Simple LZSS compression scheme.
+ */
+class LZSSCompression
+{
+ /**
+ * Finds the longest substrings that start at the given offsets.
+ * @param src The source block that we search for substrings.
+ * @param front The smaller offset.
+ * @param back The larger offset.
+ * @param size The size of the source block.
+ * @return The size of the longest substring.
+ */
+ int findSubString(uint8_t *src, int front, int back, int size);
+
+ /**
+ * Emit an encoded byte to the compressed data array. If the 2 high
+ * order bits can be signed extended, use 1 byte encoding, if not use 2
+ * bytes.
+ * @param dest The compressed data.
+ * @param byte The byte to emit.
+ * @return The number of bytes used to encode.
+ */
+ int emitByte(uint8_t *dest, uint8_t byte);
+
+ /**
+ * Emit a string reference to the compressed data array. A string reference
+ * always uses 3 bytes. 1 flag bit, 12 bits for the starting position, and
+ * 11 bits for the length of the string. This allows compression of 4096
+ * byte blocks with string lengths of up to 2048 bytes.
+ * @param dest The compressed data.
+ * @param P The starting position in the uncompressed data.
+ * @param L The length in bytes of the string.
+ */
+ void emitString(uint8_t *dest, uint16_t P, uint16_t L);
+
+ public:
+ /**
+ * Compresses the source block and stores it in the destination block. If
+ * the compressed block grows to larger than the source block, it aborts
+ * and just performs a copy.
+ * @param dest The destination block.
+ * @param src The block to be compressed.
+ * @param size The size of the source block.
+ * @return The size of the compressed block.
+ *
+ * @pre Destination has enough storage to hold the compressed block.
+ */
+ int compress(uint8_t *dest, uint8_t *src, int size);
+
+ /**
+ * Unompresses the source block and stores it in the destination block.
+ * @param dest The destination block.
+ * @param src The block to be uncompressed.
+ * @param size The size of the source block.
+ * @return The size of the uncompressed block.
+ *
+ * @pre Destination has enough storage to hold the uncompressed block.
+ */
+ int uncompress(uint8_t *dest, uint8_t *src, int size);
+};
+
+#endif //__LZSS_COMPRESSION_HH__
diff --git a/base/compression/null_compression.hh b/base/compression/null_compression.hh
new file mode 100644
index 000000000..d2bc76eef
--- /dev/null
+++ b/base/compression/null_compression.hh
@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2003 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * 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;
+ * neither the name of the copyright holders 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
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __NULL_COMPRESSION_HH__
+#define __NULL_COMPRESSION_HH__
+
+/**
+ * @file
+ * This file defines a doNothing compression algorithm.
+ */
+
+/**
+ * A dummy compression class to use when no data compression is desired.
+ */
+class NullCompression
+{
+ public:
+ /**
+ * Uncompress the data, causes a fatal since no data should be compressed.
+ * @param dest The output buffer.
+ * @param src The compressed data.
+ * @param size The number of bytes in src.
+ *
+ * @retval The size of the uncompressed data.
+ */
+ static int uncompress(uint8_t * dest, uint8_t *src, int size)
+ {
+ fatal("Can't uncompress data");
+ }
+
+ /**
+ * Compress the data, just returns the source data.
+ * @param dest The output buffer.
+ * @param src The data to be compressed.
+ * @param size The number of bytes in src.
+ *
+ * @retval The size of the compressed data.
+ */
+
+ static int compress(uint8_t *dest, uint8_t *src, int size)
+ {
+ memcpy(dest,src,size);
+ return size;
+ }
+};
+
+#endif //__NULL_COMPRESSION_HH__
diff --git a/base/hybrid_pred.cc b/base/hybrid_pred.cc
new file mode 100644
index 000000000..ed7f781b2
--- /dev/null
+++ b/base/hybrid_pred.cc
@@ -0,0 +1,273 @@
+/*
+ * Copyright (c) 2003 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * 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;
+ * neither the name of the copyright holders 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
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <string>
+#include <sstream>
+
+#include "hybrid_pred.hh"
+#include "statistics.hh"
+#include "sim_stats.hh"
+
+using namespace std;
+
+HybridPredictor::HybridPredictor(const char *_p_name, const char *_z_name,
+ const char *_o_name,
+ unsigned _index_bits, unsigned _counter_bits,
+ unsigned _zero_change, unsigned _one_change,
+ unsigned _thresh,
+ unsigned _global_bits,
+ unsigned _global_thresh,
+ bool _reg_individual_stats)
+{
+ stringstream local_name, global_name;
+
+ pred_name = _p_name;
+ one_name = _o_name;
+ zero_name = _z_name;
+ reg_individual_stats = _reg_individual_stats;
+
+ local_name << pred_name.c_str() << ":L";
+ local = new SaturatingCounterPred(local_name.str(), zero_name, one_name,
+ _index_bits, _counter_bits,
+ _zero_change, _one_change, _thresh);
+
+ global_name << pred_name.c_str() << ":G";
+ global = new SaturatingCounterPred(global_name.str(), zero_name, one_name,
+ 0, _global_bits, 1, 1, _global_thresh);
+}
+
+void HybridPredictor::regStats()
+{
+ using namespace Statistics;
+
+ string p_name;
+ stringstream description;
+
+ if (reg_individual_stats)
+ p_name = pred_name + ":A";
+ else
+ p_name = pred_name;
+
+
+ //
+ // Number of predictions
+ //
+ stringstream num_zero_preds;
+ num_zero_preds << p_name << ":" << zero_name << ":preds";
+ description << "number of predictions of " << zero_name;
+ pred_zero
+ .name(num_zero_preds.str())
+ .desc(description.str());
+ description.str("");
+
+ stringstream num_one_preds;
+ num_one_preds << p_name << ":" << one_name << ":preds";
+ description << "number of predictions of " << one_name;
+ pred_one
+ .name(num_one_preds.str())
+ .desc(description.str())
+ ;
+ description.str("");
+
+ //
+ // Count the number of correct predictions
+ //
+ stringstream num_zero_correct;
+ num_zero_correct << p_name << ":" << zero_name << ":corr_preds";
+ description << "number of correct " << zero_name << " preds" ;
+ correct_pred_zero
+ .name(num_zero_correct.str())
+ .desc(description.str())
+ ;
+ description.str("");
+
+ stringstream num_one_correct;
+ num_one_correct << p_name << ":" << one_name << ":corr_preds";
+ description << "number of correct " << one_name << " preds" ;
+ correct_pred_one
+ .name(num_one_correct.str())
+ .desc(description.str())
+ ;
+ description.str("");
+
+
+ //
+ // Number of predictor updates
+ //
+ stringstream num_zero_updates;
+ num_zero_updates << p_name << ":" << zero_name << ":updates" ;
+ description << "number of actual " << zero_name << "s" ;
+ record_zero
+ .name(num_zero_updates.str())
+ .desc(description.str())
+ ;
+ description.str("");
+
+ stringstream num_one_updates;
+ num_one_updates << p_name << ":" << one_name << ":updates" ;
+ description << "number of actual " << one_name << "s" ;
+ record_one
+ .name(num_one_updates.str())
+ .desc(description.str())
+ ;
+ description.str("");
+
+ //
+ // Local & Global predictor stats
+ //
+ if (reg_individual_stats) {
+ local->regStats();
+ global->regStats();
+ }
+}
+
+void HybridPredictor::regFormulas()
+{
+ using namespace Statistics;
+
+ string p_name;
+ stringstream description;
+ stringstream name;
+
+ if (reg_individual_stats)
+ p_name = pred_name + ":A";
+ else
+ p_name = pred_name;
+
+ //
+ // Number of predictions
+ //
+ name << p_name << ":predictions" ;
+ total_preds
+ .name(name.str())
+ .desc("total number of predictions made")
+ ;
+ total_preds = pred_one + pred_zero;
+ name.str("");
+
+ //
+ // Fraction of all predictions that are one or zero
+ //
+ name << p_name << ":" << zero_name << ":pred_frac";
+ description << "fraction of all preds that were " << zero_name ;
+ frac_preds_zero
+ .name(name.str())
+ .desc(description.str())
+ ;
+ frac_preds_zero = 100 * record_zero / total_preds;
+ description.str("");
+ name.str("");
+
+ name << p_name << ":" << one_name << ":pred_frac";
+ description << "fraction of all preds that were " << one_name ;
+ frac_preds_one
+ .name(name.str())
+ .desc(description.str())
+ ;
+ frac_preds_one = 100 * record_one / total_preds;
+ description.str("");
+ name.str("");
+
+ //
+ // Count the number of correct predictions
+ //
+ name << p_name << ":correct_preds" ;
+ total_correct
+ .name(name.str())
+ .desc("total number of correct predictions made")
+ ;
+ total_correct = correct_pred_one + correct_pred_zero;
+ name.str("");
+
+
+ //
+ // Prediction accuracy rates
+ //
+ name << p_name << ":pred_rate";
+ total_accuracy
+ .name(name.str())
+ .desc("fraction of all preds that were correct")
+ ;
+ total_accuracy = 100 * total_correct / total_preds;
+ name.str("");
+
+ name << p_name << ":" << zero_name << ":pred_rate" ;
+ description << "fraction of "<< zero_name <<" preds that were correct";
+ zero_accuracy
+ .name(name.str())
+ .desc(description.str())
+ ;
+ zero_accuracy = 100 * correct_pred_zero / pred_zero;
+ description.str("");
+ name.str("");
+
+ name << p_name << ":" << one_name << ":pred_rate" ;
+ description << "fraction of "<< one_name <<" preds that were correct";
+ one_accuracy
+ .name(name.str())
+ .desc(description.str())
+ ;
+ one_accuracy = 100 * correct_pred_one / pred_one;
+ description.str("");
+ name.str("");
+
+ //
+ // Coverage
+ //
+ name << p_name << ":" << zero_name << ":coverage";
+ description << "fraction of " << zero_name
+ << "s that were predicted correctly";
+ zero_coverage
+ .name(name.str())
+ .desc(description.str())
+ ;
+ zero_coverage = 100 * correct_pred_zero / record_zero;
+ description.str("");
+ name.str("");
+
+ name << p_name << ":" << one_name << ":coverage";
+ description << "fraction of " << one_name
+ << "s that were predicted correctly";
+ one_coverage
+ .name(name.str())
+ .desc(description.str())
+ ;
+ one_coverage = 100 * correct_pred_one / record_one;
+ description.str("");
+ name.str("");
+
+ //
+ // Local & Global predictor stats
+ //
+ if (reg_individual_stats) {
+ local->regFormulas();
+ global->regFormulas();
+ }
+
+}
+
diff --git a/base/hybrid_pred.hh b/base/hybrid_pred.hh
new file mode 100644
index 000000000..f6e14e3e3
--- /dev/null
+++ b/base/hybrid_pred.hh
@@ -0,0 +1,203 @@
+/*
+ * Copyright (c) 2003 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * 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;
+ * neither the name of the copyright holders 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
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+//==========================================================================
+//
+// This predictor takes the AND of a "local" and a "global" predictor
+// in order to determine its prediction.
+//
+//
+//
+//
+
+#ifndef __HYBRID_PRED_HH__
+#define __HYBRID_PRED_HH__
+
+#include <string>
+
+#include "sat_counter.hh"
+
+#include "statistics.hh"
+#include "sim_stats.hh"
+
+class HybridPredictor : public GenericPredictor
+{
+ private:
+ std::string pred_name;
+ std::string one_name;
+ std::string zero_name;
+ bool reg_individual_stats;
+
+ SaturatingCounterPred *local;
+ SaturatingCounterPred *global;
+
+ unsigned long max_index;
+
+ //
+ // Stats
+ //
+ Statistics::Scalar<> pred_one; //num_one_preds
+ Statistics::Scalar<> pred_zero; //num_zero_preds
+ Statistics::Scalar<> correct_pred_one; //num_one_correct
+ Statistics::Scalar<> correct_pred_zero; //num_zero_correct
+ Statistics::Scalar<> record_one; //num_one_updates
+ Statistics::Scalar<> record_zero; //num_zero_updates
+
+ Statistics::Formula total_preds;
+ Statistics::Formula frac_preds_zero;
+ Statistics::Formula frac_preds_one;
+ Statistics::Formula total_correct;
+ Statistics::Formula total_accuracy;
+ Statistics::Formula zero_accuracy;
+ Statistics::Formula one_accuracy;
+ Statistics::Formula zero_coverage;
+ Statistics::Formula one_coverage;
+
+ public:
+ HybridPredictor(const char *_p_name, const char *_z_name,
+ const char *_o_name,
+ unsigned _index_bits, unsigned _counter_bits,
+ unsigned _zero_change, unsigned _one_change,
+ unsigned _thresh,
+ unsigned _global_bits, unsigned _global_thresh,
+ bool _reg_individual_stats = false);
+
+ void clear() {
+ global->clear();
+ local->clear();
+ }
+
+ unsigned peek(unsigned long _index) {
+ unsigned l = local->peek(_index);
+ unsigned g = global->peek(_index);
+
+ if (l && g)
+ return 1;
+
+ return 0;
+ }
+
+ unsigned value(unsigned long _index) {
+ unsigned l = local->peek(_index);
+ unsigned g = global->peek(_index);
+
+ l = l & 0xFFFF;
+ g = g & 0xFFFF;
+
+ return (l << 16) | g;
+
+ }
+
+ unsigned predict(unsigned long _index) {
+ unsigned l = local->predict(_index);
+ unsigned g = global->predict(_index);
+
+ if (l && g) {
+ ++pred_one;
+ return 1;
+ }
+
+ ++pred_zero;
+ return 0;
+ }
+
+
+ //
+ // This version need only be used if local/global statistics
+ // will be maintained
+ //
+ unsigned predict(unsigned long _index, unsigned &_pdata) {
+ unsigned l = local->predict(_index);
+ unsigned g = global->predict(_index);
+
+ //
+ // bit 0 => local predictor result
+ // bit 1 => global predictor result
+ //
+ _pdata = 0;
+ if (l)
+ _pdata |= 1;
+ if (g)
+ _pdata |= 2;
+ if (l && g) {
+ ++pred_one;
+ return 1;
+ }
+
+ ++pred_zero;
+ return 0;
+ }
+
+ void record(unsigned long _index, unsigned _val, unsigned _predicted) {
+
+ if (_val) {
+ local->record(_index, _val, 0);
+ global->record(_index, _val, 0);
+ ++record_one;
+
+ if (_val == _predicted) {
+ ++correct_pred_one;
+ }
+ } else {
+ local->record(_index, _val, 0);
+ global->record(_index, _val, 0);
+ ++record_zero;
+
+ if (_val == _predicted)
+ ++correct_pred_zero;
+ }
+ }
+
+ void record(unsigned long _index, unsigned _val, unsigned _predicted,
+ unsigned _pdata)
+ {
+
+ local->record(_index, _val, (_pdata & 1));
+ global->record(_index, _val, ((_pdata & 2) ? 1 : 0));
+
+
+ if (_val) {
+ ++record_one;
+
+ if (_val == _predicted)
+ ++correct_pred_one;
+ } else {
+ ++record_zero;
+
+ if (_val == _predicted)
+ ++correct_pred_zero;
+ }
+ }
+
+ void regStats();
+ void regFormulas();
+};
+
+
+#endif // _HYBRID_PRED_HH__
+
diff --git a/base/aout_object.cc b/base/loader/aout_object.cc
index c0f43a687..c0f43a687 100644
--- a/base/aout_object.cc
+++ b/base/loader/aout_object.cc
diff --git a/base/aout_object.hh b/base/loader/aout_object.hh
index baa8904a8..baa8904a8 100644
--- a/base/aout_object.hh
+++ b/base/loader/aout_object.hh
diff --git a/base/coff_sym.h b/base/loader/coff_sym.h
index dae9d8590..dae9d8590 100644
--- a/base/coff_sym.h
+++ b/base/loader/coff_sym.h
diff --git a/base/coff_symconst.h b/base/loader/coff_symconst.h
index caed413c2..caed413c2 100644
--- a/base/coff_symconst.h
+++ b/base/loader/coff_symconst.h
diff --git a/base/ecoff_object.cc b/base/loader/ecoff_object.cc
index 87ad6fdca..87ad6fdca 100644
--- a/base/ecoff_object.cc
+++ b/base/loader/ecoff_object.cc
diff --git a/base/ecoff_object.hh b/base/loader/ecoff_object.hh
index af757cd0e..af757cd0e 100644
--- a/base/ecoff_object.hh
+++ b/base/loader/ecoff_object.hh
diff --git a/base/elf_object.cc b/base/loader/elf_object.cc
index 97f50e289..97f50e289 100644
--- a/base/elf_object.cc
+++ b/base/loader/elf_object.cc
diff --git a/base/elf_object.hh b/base/loader/elf_object.hh
index c90f6ebd5..c90f6ebd5 100644
--- a/base/elf_object.hh
+++ b/base/loader/elf_object.hh
diff --git a/base/exec_aout.h b/base/loader/exec_aout.h
index baed30c42..baed30c42 100644
--- a/base/exec_aout.h
+++ b/base/loader/exec_aout.h
diff --git a/base/exec_ecoff.h b/base/loader/exec_ecoff.h
index 8c559ab90..8c559ab90 100644
--- a/base/exec_ecoff.h
+++ b/base/loader/exec_ecoff.h
diff --git a/base/object_file.cc b/base/loader/object_file.cc
index 07b10b5ee..07b10b5ee 100644
--- a/base/object_file.cc
+++ b/base/loader/object_file.cc
diff --git a/base/object_file.hh b/base/loader/object_file.hh
index 1e37b7b70..1e37b7b70 100644
--- a/base/object_file.hh
+++ b/base/loader/object_file.hh
diff --git a/base/symtab.cc b/base/loader/symtab.cc
index 7beee182b..7beee182b 100644
--- a/base/symtab.cc
+++ b/base/loader/symtab.cc
diff --git a/base/symtab.hh b/base/loader/symtab.hh
index 073325eba..073325eba 100644
--- a/base/symtab.hh
+++ b/base/loader/symtab.hh
diff --git a/base/predictor.hh b/base/predictor.hh
new file mode 100644
index 000000000..7c446f26c
--- /dev/null
+++ b/base/predictor.hh
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2003 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * 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;
+ * neither the name of the copyright holders 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
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+//
+// Abstract base class for a generic predictor
+//
+//
+
+#ifndef __PREDICTOR_HH__
+#define __PREDICTOR_HH__
+
+struct stat_sdb_t;
+
+class GenericPredictor {
+
+ public:
+ virtual void clear() = 0;
+
+ virtual unsigned predict(unsigned long _index) = 0;
+ virtual unsigned predict(unsigned long _index, unsigned &pdata) = 0;
+
+ virtual unsigned peek(unsigned long _index) = 0;
+
+ virtual void record(unsigned long _index, unsigned _actual_value,
+ unsigned _pred_value) = 0;
+ virtual void record(unsigned long _index, unsigned _actual_value,
+ unsigned _pred_value, unsigned _pdata) = 0;
+
+ virtual unsigned value(unsigned long _index) = 0;
+
+ virtual void regStats() = 0;
+ virtual void regFormulas() = 0;
+
+ virtual ~GenericPredictor() {};
+};
+
+#endif // __PREDICTOR_HH__
diff --git a/base/sat_counter.cc b/base/sat_counter.cc
new file mode 100644
index 000000000..dc365f0f3
--- /dev/null
+++ b/base/sat_counter.cc
@@ -0,0 +1,269 @@
+/*
+ * Copyright (c) 2003 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * 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;
+ * neither the name of the copyright holders 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
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sstream>
+
+#include "sat_counter.hh"
+
+#include "statistics.hh"
+#include "sim_stats.hh"
+
+
+using namespace std;
+
+
+SaturatingCounterPred::SaturatingCounterPred(string p_name,
+ string z_name,
+ string o_name,
+ unsigned _index_bits,
+ unsigned _counter_bits,
+ unsigned _zero_change,
+ unsigned _one_change,
+ unsigned _thresh,
+ unsigned _init_value)
+{
+ pred_name = p_name;
+ zero_name = z_name;
+ one_name = o_name;
+
+ index_bits = _index_bits;
+ counter_bits = _counter_bits;
+ zero_change = _zero_change;
+ one_change = _one_change;
+ thresh = _thresh;
+ init_value = _init_value;
+
+ max_index = (1 << index_bits) - 1;
+ max_value = (1 << counter_bits) - 1;
+
+ table = new unsigned[max_index + 1];
+
+ // Initialize with the right parameters & clear the counter
+ for (int i = 0; i <= max_index; ++i)
+ table[i] = init_value;
+}
+
+void SaturatingCounterPred::regStats()
+{
+ using namespace Statistics;
+ stringstream name, description;
+
+ //
+ // Number of predictions
+ //
+ name << pred_name << ":" << zero_name << ":preds";
+ description << "number of predictions of " << zero_name;
+ predicted_zero
+ .name(name.str())
+ .desc(description.str())
+ ;
+ description.str("");
+ name.str("");
+
+ name << pred_name << ":" << one_name << ":preds";
+ description << "number of predictions of " << one_name;
+ predicted_one
+ .name(name.str())
+ .desc(description.str())
+ ;
+ description.str("");
+ name.str("");
+
+ //
+ // Count the number of correct predictions
+ //
+ name << pred_name << ":" << zero_name << ":corr_preds";
+ description << "number of correct " << zero_name << " preds";
+ correct_pred_zero
+ .name(name.str())
+ .desc(description.str())
+ ;
+ description.str("");
+ name.str("");
+
+ name << pred_name << ":" << one_name << ":corr_preds";
+ description << "number of correct " << one_name << " preds";
+ correct_pred_one
+ .name(name.str())
+ .desc(description.str())
+ ;
+ description.str("");
+ name.str("");
+
+ //
+ // Number of predictor updates
+ //
+ name << pred_name << ":" << zero_name << ":updates";
+ description << "number of actual " << zero_name << "s";
+ record_zero
+ .name(name.str())
+ .desc(description.str())
+ ;
+ description.str("");
+ name.str("");
+
+ name << pred_name << ":" << one_name << ":updates";
+ description << "number of actual " << one_name << "s";
+ record_one
+ .name(name.str())
+ .desc(description.str())
+ ;
+ description.str("");
+ name.str("");
+}
+
+void SaturatingCounterPred::regFormulas()
+{
+ using namespace Statistics;
+ stringstream name, description;
+
+ //
+ // Number of predictions
+ //
+ name << pred_name << ":predictions";
+ preds_total
+ .name(name.str())
+ .desc("total number of predictions made")
+ ;
+ preds_total = predicted_zero + predicted_one;
+ name.str("");
+
+ //
+ // Fraction of all predictions that are one or zero
+ //
+ name << pred_name << ":" << zero_name << ":pred_frac";
+ description << "fraction of all preds that were " << zero_name;
+ pred_frac_zero
+ .name(name.str())
+ .desc(description.str())
+ ;
+ pred_frac_zero = 100 * predicted_zero / preds_total;
+ description.str("");
+ name.str("");
+
+ name << pred_name << ":" << one_name << ":pred_frac";
+ description << "fraction of all preds that were " << one_name;
+ pred_frac_one
+ .name(name.str())
+ .desc(description.str())
+ ;
+ pred_frac_one = 100 * predicted_one / preds_total;
+ description.str("");
+ name.str("");
+
+
+ //
+ // Count the number of correct predictions
+ //
+ name << pred_name << ":correct_preds";
+ correct_total
+ .name(name.str())
+ .desc("total correct predictions made")
+ ;
+ correct_total = correct_pred_one + correct_pred_zero;
+ name.str("");
+
+ //
+ // Number of predictor updates
+ //
+ name << pred_name << ":updates";
+ updates_total
+ .name(name.str())
+ .desc("total number of updates")
+ ;
+ updates_total = record_zero + record_one;
+ name.str("");
+
+ //
+ // Prediction accuracy rates
+ //
+ name << pred_name << ":pred_rate";
+ pred_rate
+ .name(name.str())
+ .desc("correct fraction of all preds")
+ ;
+ pred_rate = correct_total / updates_total;
+ name.str("");
+
+ name << pred_name << ":" << zero_name << ":pred_rate";
+ description << "fraction of " << zero_name << " preds that were correct";
+ frac_correct_zero
+ .name(name.str())
+ .desc(description.str())
+ ;
+ frac_correct_zero = 100 * correct_pred_zero /
+ (correct_pred_zero + record_one - correct_pred_one);
+ description.str("");
+ name.str("");
+
+ name << pred_name << ":" << one_name << ":pred_rate";
+ description << "fraction of " << one_name << " preds that were correct";
+ frac_correct_one
+ .name(name.str())
+ .desc(description.str())
+ ;
+ frac_correct_one = 100 * correct_pred_one /
+ (correct_pred_one + record_zero - correct_pred_zero);
+ description.str("");
+ name.str("");
+
+ //
+ // Coverage
+ //
+ name << pred_name << ":" << zero_name << ":coverage";
+ description << "fraction of " << zero_name
+ << "s that were predicted correctly";
+ coverage_zero
+ .name(name.str())
+ .desc(description.str())
+ ;
+ coverage_zero = 100 * correct_pred_zero / record_zero;
+ description.str("");
+ name.str("");
+
+ name << pred_name << ":" << one_name << ":coverage";
+ description << "fraction of " << one_name
+ << "s that were predicted correctly";
+ coverage_one
+ .name(name.str())
+ .desc(description.str())
+ ;
+ coverage_one = 100 * correct_pred_one / record_one;
+ description.str("");
+ name.str("");
+}
+
+
+
+
+
+
+
+
+
+
diff --git a/base/sat_counter.hh b/base/sat_counter.hh
new file mode 100644
index 000000000..18eab3574
--- /dev/null
+++ b/base/sat_counter.hh
@@ -0,0 +1,192 @@
+/*
+ * Copyright (c) 2003 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * 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;
+ * neither the name of the copyright holders 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
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __SAT_COUNTER_HH__
+#define __SAT_COUNTER_HH__
+
+#include <string>
+
+#include "predictor.hh"
+
+#include "statistics.hh"
+#include "sim_stats.hh"
+
+struct stat_sdb_t;
+
+//
+//
+// A simple saturating counter predictor
+//
+//
+class SaturatingCounterPred : public GenericPredictor
+{
+ private:
+ std::string pred_name;
+ std::string zero_name;
+ std::string one_name;
+
+ unsigned index_bits;
+ unsigned counter_bits;
+ unsigned zero_change;
+ unsigned one_change;
+ unsigned thresh;
+ unsigned init_value;
+
+ unsigned max_value; // maximum counter value
+
+ unsigned long max_index; // also the index mask value
+ unsigned *table;
+
+ // Statistics
+ Statistics::Scalar<> predicted_one; // Total predictions of one, preds_one
+ Statistics::Scalar<> predicted_zero; // Total predictions of zero, preds_zero
+ Statistics::Scalar<> correct_pred_one; // Total correct predictions of one, correct_one
+ Statistics::Scalar<> correct_pred_zero; // Total correct predictions of zero, correct_zero
+
+ Statistics::Scalar<> record_zero; //updates_zero
+ Statistics::Scalar<> record_one; //updates_one
+
+ Statistics::Formula preds_total;
+ Statistics::Formula pred_frac_zero;
+ Statistics::Formula pred_frac_one;
+ Statistics::Formula correct_total;
+ Statistics::Formula updates_total;
+ Statistics::Formula pred_rate;
+ Statistics::Formula frac_correct_zero;
+ Statistics::Formula frac_correct_one;
+ Statistics::Formula coverage_zero;
+ Statistics::Formula coverage_one;
+
+ private:
+ bool pred_one(unsigned &counter) { return counter > thresh; }
+ bool pred_zero(unsigned &counter) { return counter <= thresh; }
+
+ void update_one(unsigned &counter) {
+
+ if (one_change)
+ counter += one_change;
+ else
+ counter = 0;
+
+ // check for wrap
+ if (counter > max_value)
+ counter = max_value;
+ }
+
+ void update_zero(unsigned &counter) {
+ if (zero_change) {
+ // check for wrap
+ if (counter < zero_change)
+ counter = 0;
+ else
+ counter -= zero_change;
+ } else
+ counter = 0;
+ }
+
+
+ public:
+
+ SaturatingCounterPred(std::string p_name,
+ std::string z_name, std::string o_name,
+ unsigned _index_bits, unsigned _counter_bits = 2,
+ unsigned _zero_change = 1, unsigned _one_change = 1,
+ unsigned _thresh = 1, unsigned _init_value = 0);
+
+ void clear() {
+ for (int i = 0; i <= max_index; ++i)
+ table[i] = init_value;
+ }
+
+ // Record the ACTUAL result... and indicate whether the prediction
+ // corresponding to this event was correct
+ void record(unsigned long _index, unsigned _val, unsigned _predicted,
+ unsigned _pdata)
+ {
+ record(_index, _val, _predicted);
+ }
+
+ void record(unsigned long _index, unsigned _val, unsigned _predicted) {
+ unsigned long index = _index & max_index;
+
+ if (_val) {
+ update_one(table[index]);
+ ++record_one;
+
+ if (_predicted)
+ ++correct_pred_one;
+ } else {
+ update_zero(table[index]);
+ ++record_zero;
+
+ if (!_predicted)
+ ++correct_pred_zero;
+ }
+ }
+
+ unsigned value(unsigned long _index) {
+ unsigned long index = _index & max_index;
+
+ return table[index];
+ }
+
+
+ unsigned predict(unsigned long _index, unsigned &pdata) {
+ return predict(_index);
+ }
+
+ unsigned predict(unsigned long _index) {
+ unsigned long index = _index & max_index;
+
+ if (pred_one(table[index])) {
+ ++predicted_one;
+ return 1;
+ }
+
+ ++predicted_zero;
+ return 0;
+ }
+
+ // No internal state is changed here
+ unsigned peek(unsigned long _index) {
+ unsigned long index = _index & max_index;
+
+ if (pred_one(table[index]))
+ return 1;
+
+ return 0;
+ }
+
+
+ //=======================================================
+ void regStats();
+ void regFormulas();
+};
+
+
+#endif // __SAT_COUNTER_HH__
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