core: new benchmark snippet for operations on reals.

test/Makefile.am

@@ -25,7 +25,8 @@ testsuite_LDFLAGS = $(top_builddir)/src/liblol.a @LOL_LIBS@ @PIPI_LIBS@
 testsuite_DEPENDENCIES = $(top_builddir)/src/liblol.a
 
 benchsuite_SOURCES = benchsuite.cpp \
-    benchmark/matrix.cpp benchmark/half.cpp benchmark/trig.cpp
+    benchmark/matrix.cpp benchmark/half.cpp benchmark/trig.cpp \
+    benchmark/real.cpp
 benchsuite_CPPFLAGS = @LOL_CFLAGS@ @PIPI_CFLAGS@
 benchsuite_LDFLAGS = $(top_builddir)/src/liblol.a @LOL_LIBS@ @PIPI_LIBS@
 benchsuite_DEPENDENCIES = $(top_builddir)/src/liblol.a

test/benchmark/real.cpp

@@ -0,0 +1,69 @@
+//
+// Lol Engine - Benchmark program
+//
+// Copyright: (c) 2005-2011 Sam Hocevar <sam@hocevar.net>
+//   This program is free software; you can redistribute it and/or
+//   modify it under the terms of the Do What The Fuck You Want To
+//   Public License, Version 2, as published by Sam Hocevar. See
+//   http://sam.zoy.org/projects/COPYING.WTFPL for more details.
+//
+
+#if defined HAVE_CONFIG_H
+#   include "config.h"
+#endif
+
+#include <cstdio>
+
+#include "core.h"
+
+using namespace std;
+using namespace lol;
+
+static size_t const REAL_TABLE_SIZE = 10000;
+static size_t const REAL_RUNS = 50;
+
+void bench_real(int mode)
+{
+    float result[12] = { 0.0f };
+    Timer timer;
+
+    for (size_t run = 0; run < REAL_RUNS; run++)
+    {
+        switch (mode)
+        {
+        case 1:
+            break;
+        }
+
+        real fib1 = 1.0, fib2 = 1.0;
+        timer.GetMs();
+        for (size_t i = 0; i < REAL_TABLE_SIZE; i++)
+        {
+            real tmp = fib1 + fib2;
+            fib1 = fib2;
+            fib2 = tmp;
+        }
+        result[0] += timer.GetMs();
+
+        real fact = 1.0;
+        timer.GetMs();
+        for (size_t i = 0; i < REAL_TABLE_SIZE; i++)
+            fact = fact * real(1.0 + i);
+        result[1] += timer.GetMs();
+
+        real invfact = 1.0;
+        timer.GetMs();
+        for (size_t i = 0; i < REAL_TABLE_SIZE; i++)
+            invfact = invfact / real(1.0 + i);
+        result[2] += timer.GetMs();
+    }
+
+    for (size_t i = 0; i < sizeof(result) / sizeof(*result); i++)
+        result[i] *= 1000000.0f / (REAL_TABLE_SIZE * REAL_RUNS);
+
+    Log::Info("                              ns/elem\n");
+    Log::Info("real = real + real           %7.3f\n", result[0]);
+    Log::Info("real = real * real           %7.3f\n", result[1]);
+    Log::Info("real = real / real           %7.3f\n", result[2]);
+}
+

test/benchsuite.cpp

@@ -23,12 +23,18 @@
 using namespace std;
 using namespace lol;
 
+void bench_real(int mode);
 void bench_trig(int mode);
 void bench_matrix(int mode);
 void bench_half(int mode);
 
 int main(int argc, char **argv)
 {
+    Log::Info("-----------------------\n");
+    Log::Info(" High precision floats\n");
+    Log::Info("-----------------------\n");
+    bench_real(1);
+
     Log::Info("--------------------------\n");
     Log::Info(" Trigonometry [-1e5, 1e5]\n");
     Log::Info("--------------------------\n");