changeset 16634:f7facf65bb70

log* tests: More tests. * tests/test-log.h: New file. * tests/test-log.c: Include <float.h>, minus-zero.h, test-log.h. (main): Invoke test_function. * tests/test-logf.c: Include <float.h>, minus-zero.h, test-log.h. (main): Invoke test_function. * tests/test-logl.c: Include <float.h>, minus-zero.h, test-log.h. (main): Invoke test_function. * modules/log-tests (Files): Add tests/test-log.h, tests/minus-zero.h, tests/randomd.c. (Makefile.am): Add randomd.c to test_log_SOURCES. * modules/logf-tests (Files): Add tests/test-log.h, tests/minus-zero.h, tests/randomf.c. (Makefile.am): Add randomf.c to test_logf_SOURCES. * modules/logl-tests (Files): Add tests/test-log.h, tests/minus-zero.h, tests/randoml.c. (Depends-on): Add 'float'. (Makefile.am): Add randoml.c to test_logl_SOURCES.
author Bruno Haible <bruno@clisp.org>
date Sat, 10 Mar 2012 10:56:05 +0100
parents 833042aa7d55
children a0aac1eb3f2d
files ChangeLog modules/log-tests modules/logf-tests modules/logl-tests tests/test-log.c tests/test-log.h tests/test-logf.c tests/test-logl.c
diffstat 8 files changed, 176 insertions(+), 6 deletions(-) [+]
line wrap: on
line diff
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,24 @@
+2012-03-10  Bruno Haible  <bruno@clisp.org>
+
+	log* tests: More tests.
+	* tests/test-log.h: New file.
+	* tests/test-log.c: Include <float.h>, minus-zero.h, test-log.h.
+	(main): Invoke test_function.
+	* tests/test-logf.c: Include <float.h>, minus-zero.h, test-log.h.
+	(main): Invoke test_function.
+	* tests/test-logl.c: Include <float.h>, minus-zero.h, test-log.h.
+	(main): Invoke test_function.
+	* modules/log-tests (Files): Add tests/test-log.h, tests/minus-zero.h,
+	tests/randomd.c.
+	(Makefile.am): Add randomd.c to test_log_SOURCES.
+	* modules/logf-tests (Files): Add tests/test-log.h, tests/minus-zero.h,
+	tests/randomf.c.
+	(Makefile.am): Add randomf.c to test_logf_SOURCES.
+	* modules/logl-tests (Files): Add tests/test-log.h, tests/minus-zero.h,
+	tests/randoml.c.
+	(Depends-on): Add 'float'.
+	(Makefile.am): Add randoml.c to test_logl_SOURCES.
+
 2012-03-09  Bruno Haible  <bruno@clisp.org>
 
 	logl: Work around OSF/1 5.1 bug.
--- a/modules/log-tests
+++ b/modules/log-tests
@@ -1,7 +1,10 @@
 Files:
 tests/test-log.c
+tests/test-log.h
+tests/minus-zero.h
 tests/signature.h
 tests/macros.h
+tests/randomd.c
 
 Depends-on:
 
@@ -10,4 +13,5 @@
 Makefile.am:
 TESTS += test-log
 check_PROGRAMS += test-log
+test_log_SOURCES = test-log.c randomd.c
 test_log_LDADD = $(LDADD) @LOG_LIBM@
--- a/modules/logf-tests
+++ b/modules/logf-tests
@@ -1,7 +1,10 @@
 Files:
 tests/test-logf.c
+tests/test-log.h
+tests/minus-zero.h
 tests/signature.h
 tests/macros.h
+tests/randomf.c
 
 Depends-on:
 
@@ -10,4 +13,5 @@
 Makefile.am:
 TESTS += test-logf
 check_PROGRAMS += test-logf
+test_logf_SOURCES = test-logf.c randomf.c
 test_logf_LDADD = $(LDADD) @LOGF_LIBM@
--- a/modules/logl-tests
+++ b/modules/logl-tests
@@ -1,14 +1,19 @@
 Files:
 tests/test-logl.c
+tests/test-log.h
+tests/minus-zero.h
 tests/signature.h
 tests/macros.h
+tests/randoml.c
 
 Depends-on:
 fpucw
+float
 
 configure.ac:
 
 Makefile.am:
 TESTS += test-logl
 check_PROGRAMS += test-logl
+test_logl_SOURCES = test-logl.c randoml.c
 test_logl_LDADD = $(LDADD) @LOGL_LIBM@
--- a/tests/test-log.c
+++ b/tests/test-log.c
@@ -23,10 +23,19 @@
 #include "signature.h"
 SIGNATURE_CHECK (log, double, (double));
 
+#include <float.h>
+
+#include "minus-zero.h"
 #include "macros.h"
 
-volatile double x;
-double y;
+#define DOUBLE double
+#define HUGEVAL HUGE_VAL
+#define L_(literal) literal
+#define MANT_DIG DBL_MANT_DIG
+#define MINUS_ZERO minus_zerod
+#define LOG log
+#define RANDOM randomd
+#include "test-log.h"
 
 int
 main ()
@@ -36,5 +45,7 @@
   y = log (x);
   ASSERT (y >= -0.5108256238 && y <= -0.5108256237);
 
+  test_function ();
+
   return 0;
 }
new file mode 100644
--- /dev/null
+++ b/tests/test-log.h
@@ -0,0 +1,103 @@
+/* Test of log*() function family.
+   Copyright (C) 2012 Free Software Foundation, Inc.
+
+   This program 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 of the License, or
+   (at your option) any later version.
+
+   This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+static void
+test_function (void)
+{
+  int i;
+  int j;
+  const DOUBLE TWO_MANT_DIG =
+    /* Assume MANT_DIG <= 5 * 31.
+       Use the identity
+         n = floor(n/5) + floor((n+1)/5) + ... + floor((n+4)/5).  */
+    (DOUBLE) (1U << ((MANT_DIG - 1) / 5))
+    * (DOUBLE) (1U << ((MANT_DIG - 1 + 1) / 5))
+    * (DOUBLE) (1U << ((MANT_DIG - 1 + 2) / 5))
+    * (DOUBLE) (1U << ((MANT_DIG - 1 + 3) / 5))
+    * (DOUBLE) (1U << ((MANT_DIG - 1 + 4) / 5));
+
+  {
+    DOUBLE z = LOG (L_(0.0));
+    ASSERT (z == - HUGEVAL);
+  }
+  {
+    DOUBLE z = LOG (MINUS_ZERO);
+    ASSERT (z == - HUGEVAL);
+  }
+
+  /* Randomized tests.  */
+  {
+    /* Error bound, in ulps.  */
+    const DOUBLE err_bound =
+      (sizeof (DOUBLE) == sizeof (long double) ?
+#if defined __i386__ && defined __FreeBSD__
+       /* On FreeBSD/x86 6.4, the 'long double' type really has only 53 bits of
+          precision in the compiler but 64 bits of precision at runtime.  See
+          <http://lists.gnu.org/archive/html/bug-gnulib/2008-07/msg00063.html>.
+          The compiler has truncated all 'long double' literals in logl.c to
+          53 bits of precision.  */
+       L_(40.0)
+#else
+       L_(3.0)
+#endif
+       : L_(3.0));
+
+    for (i = 0; i < SIZEOF (RANDOM); i++)
+      {
+        DOUBLE x = L_(16.0) * RANDOM[i] + L_(1.0); /* 1.0 <= x <= 17.0 */
+        DOUBLE y = LOG (x);
+        DOUBLE z = LOG (L_(1.0) / x);
+        DOUBLE err = y + z;
+        ASSERT (y >= L_(0.0));
+        ASSERT (z <= L_(0.0));
+        ASSERT (err > - err_bound / TWO_MANT_DIG
+                && err < err_bound / TWO_MANT_DIG);
+      }
+  }
+
+  {
+    /* Error bound, in ulps.  */
+    const DOUBLE err_bound =
+      (sizeof (DOUBLE) == sizeof (long double) ?
+#if defined __i386__ && defined __FreeBSD__
+       /* On FreeBSD/x86 6.4, the 'long double' type really has only 53 bits of
+          precision in the compiler but 64 bits of precision at runtime.  See
+          <http://lists.gnu.org/archive/html/bug-gnulib/2008-07/msg00063.html>.
+          The compiler has truncated all 'long double' literals in logl.c to
+          53 bits of precision.  */
+       L_(85.0)
+#else
+       L_(7.0)
+#endif
+       : L_(7.0));
+
+    for (i = 0; i < SIZEOF (RANDOM) / 5; i++)
+      for (j = 0; j < SIZEOF (RANDOM) / 5; j++)
+        {
+          DOUBLE x = L_(17.0) / (L_(16.0) - L_(15.0) * RANDOM[i]) - L_(1.0);
+          DOUBLE y = L_(17.0) / (L_(16.0) - L_(15.0) * RANDOM[j]) - L_(1.0);
+          /* 1/16 <= x,y <= 16 */
+          DOUBLE z = L_(1.0) / (x * y);
+          /* Approximately  x * y * z = 1.  */
+          DOUBLE err = LOG (x) + LOG (y) + LOG (z);
+          ASSERT (err > - err_bound / TWO_MANT_DIG
+                  && err < err_bound / TWO_MANT_DIG);
+        }
+  }
+}
+
+volatile DOUBLE x;
+DOUBLE y;
--- a/tests/test-logf.c
+++ b/tests/test-logf.c
@@ -23,10 +23,19 @@
 #include "signature.h"
 SIGNATURE_CHECK (logf, float, (float));
 
+#include <float.h>
+
+#include "minus-zero.h"
 #include "macros.h"
 
-volatile float x;
-float y;
+#define DOUBLE float
+#define HUGEVAL HUGE_VALF
+#define L_(literal) literal##f
+#define MANT_DIG FLT_MANT_DIG
+#define MINUS_ZERO minus_zerof
+#define LOG logf
+#define RANDOM randomf
+#include "test-log.h"
 
 int
 main ()
@@ -36,5 +45,7 @@
   y = logf (x);
   ASSERT (y >= -0.5108257f && y <= -0.5108256f);
 
+  test_function ();
+
   return 0;
 }
--- a/tests/test-logl.c
+++ b/tests/test-logl.c
@@ -23,11 +23,20 @@
 #include "signature.h"
 SIGNATURE_CHECK (logl, long double, (long double));
 
+#include <float.h>
+
 #include "fpucw.h"
+#include "minus-zero.h"
 #include "macros.h"
 
-volatile long double x;
-long double y;
+#define DOUBLE long double
+#define HUGEVAL HUGE_VALL
+#define L_(literal) literal##L
+#define MANT_DIG LDBL_MANT_DIG
+#define MINUS_ZERO minus_zerol
+#define LOG logl
+#define RANDOM randoml
+#include "test-log.h"
 
 int
 main ()
@@ -41,5 +50,7 @@
   y = logl (x);
   ASSERT (y >= -0.5108256238L && y <= -0.5108256237L);
 
+  test_function ();
+
   return 0;
 }