Add benchmark for small integers

This benchmark is a sample of 1 million "small" integers
in range [-1000000 1000000) sampled from uniform distribution.

benchmarks/CMakeLists.txt

@@ -19,6 +19,7 @@ file(COPY ${CMAKE_SOURCE_DIR}/data DESTINATION .)
 file(COPY ${CMAKE_SOURCE_DIR}/../test/data/regression/floats.json
           ${CMAKE_SOURCE_DIR}/../test/data/regression/unsigned_ints.json
           ${CMAKE_SOURCE_DIR}/../test/data/regression/signed_ints.json
+          ${CMAKE_SOURCE_DIR}/../test/data/regression/small_signed_ints.json
     DESTINATION data/numbers)
 
 # benchmark binary

benchmarks/src/benchmarks.cpp

@@ -35,7 +35,7 @@ BENCHMARK_CAPTURE(ParseFile, twitter,       "data/nativejson-benchmark/twitter.j
 BENCHMARK_CAPTURE(ParseFile, floats,                "data/numbers/floats.json");
 BENCHMARK_CAPTURE(ParseFile, signed_ints,           "data/numbers/signed_ints.json");
 BENCHMARK_CAPTURE(ParseFile, unsigned_ints,         "data/numbers/unsigned_ints.json");
-
+BENCHMARK_CAPTURE(ParseFile, small_signed_ints,     "data/numbers/small_signed_ints.json");
 
 //////////////////////////////////////////////////////////////////////////////
 // parse JSON from string
@@ -68,6 +68,7 @@ BENCHMARK_CAPTURE(ParseString, twitter,       "data/nativejson-benchmark/twitter
 BENCHMARK_CAPTURE(ParseString, floats,              "data/numbers/floats.json");
 BENCHMARK_CAPTURE(ParseString, signed_ints,         "data/numbers/signed_ints.json");
 BENCHMARK_CAPTURE(ParseString, unsigned_ints,       "data/numbers/unsigned_ints.json");
+BENCHMARK_CAPTURE(ParseString, small_signed_ints,   "data/numbers/small_signed_ints.json");
 
 
 //////////////////////////////////////////////////////////////////////////////
@@ -101,6 +102,8 @@ BENCHMARK_CAPTURE(Dump, signed_ints / -,   "data/numbers/signed_ints.json",
 BENCHMARK_CAPTURE(Dump, signed_ints / 4,   "data/numbers/signed_ints.json",               4);
 BENCHMARK_CAPTURE(Dump, unsigned_ints / -, "data/numbers/unsigned_ints.json",             -1);
 BENCHMARK_CAPTURE(Dump, unsigned_ints / 4, "data/numbers/unsigned_ints.json",             4);
+BENCHMARK_CAPTURE(Dump, small_signed_ints / -,   "data/numbers/small_signed_ints.json",   -1);
+BENCHMARK_CAPTURE(Dump, small_signed_ints / 4,   "data/numbers/small_signed_ints.json",   4);
 
 
 BENCHMARK_MAIN();

test/src/unit-regression.cpp

@@ -669,7 +669,8 @@ TEST_CASE("regression tests")
                 {
                     "test/data/regression/floats.json",
                     "test/data/regression/signed_ints.json",
-                    "test/data/regression/unsigned_ints.json"
+                    "test/data/regression/unsigned_ints.json",
+                    "test/data/regression/small_signed_ints.json"
                 })
         {
             CAPTURE(filename)