FPGA: reduce snappy decompression simulation duration (#1478)

When using Questa FSE, the simulation time of the snappy decompression of Stratix 10 was excessively long, This PR reduces the problem size when running in simulation to speed up the execution time. This PR is a port of #1475.

Author: yuguen

DirectProgramming/C++SYCL_FPGA/ReferenceDesigns/decompress/data/snappy/alice29_small.txt.sz

@@ -0,0 +1,23 @@
+
+
+
+
+                ALICE'S ADVENTURES IN WONDERLAND
+
+                          Lewis Carroll
+
+               THE MILLENNIUM FULCRUM EDITION 2.9
+
+
+
+
+                            CHAPTER I
+
+                      Down the Rabbit-Hole
+
+
+  Alice was beginning to get very tired of sitting by her sister
+on the bank, and of having nothing to do:  once or twice she had
+peeped into the book her sister was reading, but it had no
+pictures or conversations in it, `and what is the use of a book,'
+thought Alice `without pictures or conversation?'

DirectProgramming/C++SYCL_FPGA/ReferenceDesigns/decompress/data/snappy/alice29_small_ref.txt

@@ -240,23 +240,37 @@ bool RunGzipTest(sycl::queue& q, GzipDecompressorT decompressor,
 bool RunSnappyTest(sycl::queue& q, SnappyDecompressorT decompressor,
                    const std::string test_dir) {
 
+
+#ifdef FPGA_SIMULATOR
   std::cout << ">>>>> Alice In Wonderland Test <<<<<" << std::endl;
-  std::string alice_in_file = test_dir + "/alice29.txt.sz";
+  std::string alice_in_file = test_dir + "/alice29_small.txt.sz";
   auto in_bytes = ReadInputFile(alice_in_file);
   auto result = decompressor.DecompressBytes(q, in_bytes, 1, false);
 
-  std::string alice_ref_file = test_dir + "/alice29.ref.txt";
+  std::string alice_ref_file = test_dir + "/alice29_small_ref.txt";
   auto ref_bytes = ReadInputFile(alice_ref_file);
   bool alice_test_pass =
       (result != std::nullopt) && (result.value() == ref_bytes);
 
   PrintTestResults("Alice In Wonderland Test", alice_test_pass);
   std::cout << std::endl;
 
-#ifdef FPGA_SIMULATOR
   return alice_test_pass;
 #else
 
+  std::cout << ">>>>> Alice In Wonderland Test <<<<<" << std::endl;
+  std::string alice_in_file = test_dir + "/alice29.txt.sz";
+  auto in_bytes = ReadInputFile(alice_in_file);
+  auto result = decompressor.DecompressBytes(q, in_bytes, 1, false);
+
+  std::string alice_ref_file = test_dir + "/alice29.ref.txt";
+  auto ref_bytes = ReadInputFile(alice_ref_file);
+  bool alice_test_pass =
+      (result != std::nullopt) && (result.value() == ref_bytes);
+
+  PrintTestResults("Alice In Wonderland Test", alice_test_pass);
+  std::cout << std::endl;
+
   std::cout << ">>>>> Only Literal Strings Test <<<<<" << std::endl;
   auto test1_bytes = GenerateSnappyCompressedData(333, 3, 0, 0, 3);
   auto test1_ret = decompressor.DecompressBytes(q, test1_bytes, 1, false);