1 files changed, 103 insertions, 0 deletions
diff --git a/gnuradio-runtime/lib/qa_gr_fxpt.cc b/gnuradio-runtime/lib/qa_gr_fxpt.cc
new file mode 100644
index 0000000000..7eac0d8964
--- /dev/null
+++ b/gnuradio-runtime/lib/qa_gr_fxpt.cc
@@ -0,0 +1,103 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <qa_gr_fxpt.h>
+#include <gr_fxpt.h>
+#include <cppunit/TestAssert.h>
+#include <iostream>
+#include <stdio.h>
+#include <unistd.h>
+#include <math.h>
+
+static const float SIN_COS_TOLERANCE = 1e-5;
+
+void
+qa_gr_fxpt::t0 ()
+{
+  CPPUNIT_ASSERT_DOUBLES_EQUAL (M_PI/2, gr_fxpt::fixed_to_float (0x40000000), SIN_COS_TOLERANCE);
+  CPPUNIT_ASSERT_DOUBLES_EQUAL (0.0,    gr_fxpt::fixed_to_float (0x00000000), SIN_COS_TOLERANCE);
+  CPPUNIT_ASSERT_DOUBLES_EQUAL (-M_PI,  gr_fxpt::fixed_to_float (0x80000000), SIN_COS_TOLERANCE);
+
+  if (0){
+    /*
+     * These are disabled because of some precision issues.
+     *
+     * Different compilers seem to have different opinions on whether
+     * the calulations are done single or double (or extended)
+     * precision.  Any of the answers are fine for our real purpose, but
+     * sometimes the answer is off by a few bits at the bottom.
+     * Hence, the disabled check.
+     */
+    CPPUNIT_ASSERT_EQUAL ((gr_int32) 0x40000000, gr_fxpt::float_to_fixed (M_PI/2));
+    CPPUNIT_ASSERT_EQUAL ((gr_int32) 0,          gr_fxpt::float_to_fixed (0));
+    CPPUNIT_ASSERT_EQUAL ((gr_int32) 0x80000000, gr_fxpt::float_to_fixed (-M_PI));
+  }
+}
+
+void
+qa_gr_fxpt::t1 ()
+{
+
+  CPPUNIT_ASSERT_DOUBLES_EQUAL ( 0,           gr_fxpt::sin (0x00000000), SIN_COS_TOLERANCE);
+  CPPUNIT_ASSERT_DOUBLES_EQUAL ( 0.707106781, gr_fxpt::sin (0x20000000), SIN_COS_TOLERANCE);
+  CPPUNIT_ASSERT_DOUBLES_EQUAL ( 1,           gr_fxpt::sin (0x40000000), SIN_COS_TOLERANCE);
+  CPPUNIT_ASSERT_DOUBLES_EQUAL ( 0.707106781, gr_fxpt::sin (0x60000000), SIN_COS_TOLERANCE);
+  CPPUNIT_ASSERT_DOUBLES_EQUAL ( 0,           gr_fxpt::sin (0x7fffffff), SIN_COS_TOLERANCE);
+  CPPUNIT_ASSERT_DOUBLES_EQUAL ( 0,           gr_fxpt::sin (0x80000000), SIN_COS_TOLERANCE);
+  CPPUNIT_ASSERT_DOUBLES_EQUAL ( 0,           gr_fxpt::sin (0x80000001), SIN_COS_TOLERANCE);
+  CPPUNIT_ASSERT_DOUBLES_EQUAL (-1,           gr_fxpt::sin (-0x40000000), SIN_COS_TOLERANCE);
+  CPPUNIT_ASSERT_DOUBLES_EQUAL (-0.707106781, gr_fxpt::sin (-0x20000000), SIN_COS_TOLERANCE);
+
+
+  for (float p = -M_PI; p < M_PI; p += 2 * M_PI / 3600){
+    float expected = sin (p);
+    float actual = gr_fxpt::sin (gr_fxpt::float_to_fixed (p));
+    CPPUNIT_ASSERT_DOUBLES_EQUAL (expected, actual, SIN_COS_TOLERANCE);
+  }
+}
+
+void
+qa_gr_fxpt::t2 ()
+{
+  for (float p = -M_PI; p < M_PI; p += 2 * M_PI / 3600){
+    float expected = cos (p);
+    float actual = gr_fxpt::cos (gr_fxpt::float_to_fixed (p));
+    CPPUNIT_ASSERT_DOUBLES_EQUAL (expected, actual, SIN_COS_TOLERANCE);
+  }
+}
+
+void
+qa_gr_fxpt::t3 ()
+{
+  for (float p = -M_PI; p < M_PI; p += 2 * M_PI / 3600){
+    float expected_sin = sin (p);
+    float expected_cos = cos (p);
+    float actual_sin;
+    float actual_cos;
+    gr_fxpt::sincos (gr_fxpt::float_to_fixed (p), &actual_sin, &actual_cos);
+    CPPUNIT_ASSERT_DOUBLES_EQUAL (expected_sin, actual_sin, SIN_COS_TOLERANCE);
+    CPPUNIT_ASSERT_DOUBLES_EQUAL (expected_cos, actual_cos, SIN_COS_TOLERANCE);
+  }
+}