mem-cache: Rename Encoder namespace as encoder

As part of recent decisions regarding namespace
naming conventions, all namespaces will be changed
to snake case.

compression::Encoder became compression::encoder.

Change-Id: I3ff2693fbbfc366952cf0f03414a00debae27635
Signed-off-by: Daniel R. Carvalho <odanrc@yahoo.com.br>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/45408
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Hoa Nguyen <hoanguyen@ucdavis.edu>

src/mem/cache/compressors/encoders/base.hh

@@ -36,7 +36,9 @@
 GEM5_DEPRECATED_NAMESPACE(Compressor, compression);
 namespace compression
 {
-namespace Encoder {
+GEM5_DEPRECATED_NAMESPACE(Encoder, encoder);
+namespace encoder
+{
 
 struct Code
 {
@@ -77,7 +79,7 @@ class Base
     virtual uint64_t decode(const uint64_t code) const = 0;
 };
 
-} // namespace Encoder
+} // namespace encoder
 } // namespace compression
 
 #endif //__MEM_CACHE_COMPRESSORS_ENCODERS_BASE_HH__

src/mem/cache/compressors/encoders/huffman.cc

@@ -35,7 +35,9 @@
 GEM5_DEPRECATED_NAMESPACE(Compressor, compression);
 namespace compression
 {
-namespace Encoder {
+GEM5_DEPRECATED_NAMESPACE(Encoder, encoder);
+namespace encoder
+{
 
 Huffman::Huffman(uint64_t max_code_length)
   : Base(), maxCodeLength(max_code_length)
@@ -132,5 +134,5 @@ Huffman::decode(const uint64_t code) const
     return it->second;
 }
 
-} // namespace Encoder
+} // namespace encoder
 } // namespace compression

src/mem/cache/compressors/encoders/huffman.hh

@@ -36,12 +36,15 @@
 #include <queue>
 #include <vector>
 
+#include "base/compiler.hh"
 #include "mem/cache/compressors/encoders/base.hh"
 
 GEM5_DEPRECATED_NAMESPACE(Compressor, compression);
 namespace compression
 {
-namespace Encoder {
+GEM5_DEPRECATED_NAMESPACE(Encoder, encoder);
+namespace encoder
+{
 
 /**
  * This encoder builds a Huffman tree using the frequency of each value to
@@ -176,7 +179,7 @@ class Huffman : public Base
     void generateCodes(const Node* node, const Code& current_code);
 };
 
-} // namespace Encoder
+} // namespace encoder
 } // namespace compression
 
 #endif //__MEM_CACHE_COMPRESSORS_ENCODERS_HUFFMAN_HH__

src/mem/cache/compressors/frequent_values.cc

@@ -70,7 +70,7 @@ FrequentValues::compress(const std::vector<Chunk>& chunks, Cycles& comp_lat,
     // Compress every value sequentially. The compressed values are then
     // added to the final compressed data.
     for (const auto& chunk : chunks) {
-        Encoder::Code code;
+        encoder::Code code;
         int length = 0;
         if (phase == COMPRESSING) {
             VFTEntry* entry = VFT.findEntry(chunk, false);
@@ -144,7 +144,7 @@ FrequentValues::decompress(const CompressionData* comp_data, uint64_t* data)
                 // its corresponding value, in order to make life easier we
                 // search for the value and verify that the stored code
                 // matches the table's
-                GEM5_VAR_USED const Encoder::Code code =
+                GEM5_VAR_USED const encoder::Code code =
                     indexEncoder.encode(comp_chunk.value);
 
                 // Either the value will be found and the codes match, or the

src/mem/cache/compressors/frequent_values.hh

@@ -82,7 +82,7 @@ class FrequentValues : public Base
     const bool useHuffmanEncoding;
 
     /** The encoder applied to the VFT indices. */
-    Encoder::Huffman indexEncoder;
+    encoder::Huffman indexEncoder;
 
     /** Number of bits in the saturating counters. */
     const int counterBits;
@@ -199,7 +199,7 @@ class FrequentValues::CompData : public CompressionData
     struct CompressedValue
     {
         /** The codeword.*/
-        Encoder::Code code;
+        encoder::Code code;
 
         /**
          * Original value, stored both for when the codeword marks an
@@ -207,7 +207,7 @@ class FrequentValues::CompData : public CompressionData
          */
         uint64_t value;
 
-        CompressedValue(Encoder::Code _code, uint64_t _value)
+        CompressedValue(encoder::Code _code, uint64_t _value)
           : code(_code), value(_value)
         {
         }