Set errno for log1p on pole/domain error.

According to bug 6792, errno is not set to ERANGE/EDOM
by calling log1p/log1pf/log1pl with x = -1 or x < -1.

This patch adds a wrapper which sets errno in those cases
and returns the value of the existing __log1p function.
The log1p is now an alias to the wrapper function
instead of __log1p.

The files in sysdeps are reflecting these changes.
The ia64 implementation sets errno by itself,
thus the wrapper-file is empty.

The libm-test is adjusted for log1p-tests to check errno.

	[BZ #6792]
	* math/w_log1p.c: New file.
	* math/w_log1pf.c: Likewise.
	* math/w_log1pl.c: Likewise.
	* math/Makefile (libm-calls): Add w_log1p.
	* math/s_log1pl.c (log1pl): Remove weak_alias.
	* sysdeps/i386/fpu/s_log1p.S (log1p): Likewise.
	* sysdeps/i386/fpu/s_log1pf.S (log1pf): Likewise.
	* sysdeps/i386/fpu/s_log1pl.S (log1pl): Likewise.
	* sysdeps/x86_64/fpu/s_log1pl.S (log1pl): Likewise.
	* sysdeps/ieee754/dbl-64/s_log1p.c (log1p): Likewise.
	[NO_LONG_DOUBLE] (log1pl): Likewise.
	* sysdeps/ieee754/flt-32/s_log1pf.c (log1pf): Likewise.
	* sysdeps/ieee754/ldbl-128/s_log1pl.c (log1pl): Likewise.
	* sysdeps/ieee754/ldbl-64-128/s_log1pl.c
	(log1p): Remove long_double_symbol.
	* sysdeps/ieee754/ldbl-128ibm/s_log1pl.c (log1pl): Likewise.
	* sysdeps/ieee754/ldbl-64-128/w_log1pl.c: New file.
	* sysdeps/ieee754/ldbl-128ibm/w_log1pl.c: Likewise.
	* sysdeps/m68k/m680x0/fpu/s_log1p.c: Define empty weak_alias to
	remove weak_alias for corresponding log1p function.
	* sysdeps/m68k/m680x0/fpu/s_log1pf.c: Likewise.
	* sysdeps/m68k/m680x0/fpu/s_log1pl.c: Likewise.
	* sysdeps/ia64/fpu/w_log1p.c: New file.
	* sysdeps/ia64/fpu/w_log1pf.c: Likewise.
	* sysdeps/ia64/fpu/w_log1pl.c: Likewise.
	* math/libm-test.inc (log1p_test_data):	Add errno expectations.

ChangeLog

@@ -1,3 +1,33 @@
+2015-04-13  Stefan Liebler  <stli@linux.vnet.ibm.com>
+
+	[BZ #6792]
+	* math/w_log1p.c: New file.
+	* math/w_log1pf.c: Likewise.
+	* math/w_log1pl.c: Likewise.
+	* math/Makefile (libm-calls): Add w_log1p.
+	* math/s_log1pl.c (log1pl): Remove weak_alias.
+	* sysdeps/i386/fpu/s_log1p.S (log1p): Likewise.
+	* sysdeps/i386/fpu/s_log1pf.S (log1pf): Likewise.
+	* sysdeps/i386/fpu/s_log1pl.S (log1pl): Likewise.
+	* sysdeps/x86_64/fpu/s_log1pl.S (log1pl): Likewise.
+	* sysdeps/ieee754/dbl-64/s_log1p.c (log1p): Likewise.
+	[NO_LONG_DOUBLE] (log1pl): Likewise.
+	* sysdeps/ieee754/flt-32/s_log1pf.c (log1pf): Likewise.
+	* sysdeps/ieee754/ldbl-128/s_log1pl.c (log1pl): Likewise.
+	* sysdeps/ieee754/ldbl-64-128/s_log1pl.c
+	(log1p): Remove long_double_symbol.
+	* sysdeps/ieee754/ldbl-128ibm/s_log1pl.c (log1pl): Likewise.
+	* sysdeps/ieee754/ldbl-64-128/w_log1pl.c: New file.
+	* sysdeps/ieee754/ldbl-128ibm/w_log1pl.c: Likewise.
+	* sysdeps/m68k/m680x0/fpu/s_log1p.c: Define empty weak_alias to
+	remove weak_alias for corresponding log1p function.
+	* sysdeps/m68k/m680x0/fpu/s_log1pf.c: Likewise.
+	* sysdeps/m68k/m680x0/fpu/s_log1pl.c: Likewise.
+	* sysdeps/ia64/fpu/w_log1p.c: New file.
+	* sysdeps/ia64/fpu/w_log1pf.c: Likewise.
+	* sysdeps/ia64/fpu/w_log1pl.c: Likewise.
+	* math/libm-test.inc (log1p_test_data):	Add errno expectations.
+
 2015-04-10  Joseph Myers  <joseph@codesourcery.com>
 
 	[BZ #18247]

NEWS

@@ -9,7 +9,7 @@ Version 2.22
 
 * The following bugs are resolved with this release:
 
-  4719, 13064, 14094, 14841, 14906, 15319, 15467, 15790, 15969, 16351,
+  4719, 6792, 13064, 14094, 14841, 14906, 15319, 15467, 15790, 15969, 16351,
   16512, 16560, 16783, 16850, 17090, 17195, 17269, 17523, 17542, 17569,
   17588, 17596, 17620, 17621, 17628, 17631, 17711, 17776, 17779, 17792,
   17836, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965, 17967,

math/Makefile

@@ -47,7 +47,7 @@ libm-calls = e_acos e_acosh e_asin e_atan2 e_atanh e_cosh e_exp e_fmod	\
 	     e_ilogb							\
 	     k_cos k_rem_pio2 k_sin k_tan s_asinh s_atan s_cbrt		\
 	     s_ceil s_cos s_erf s_expm1 s_fabs				\
-	     s_floor s_log1p s_logb					\
+	     s_floor s_log1p w_log1p s_logb				\
 	     s_nextafter s_nexttoward s_rint s_scalbln w_scalbln	\
 	     s_significand s_sin s_tan s_tanh w_acos w_acosh w_asin	\
 	     w_atan2 w_atanh w_cosh w_drem w_exp w_exp2 w_exp10 w_fmod	\

math/libm-test.inc

@@ -7798,10 +7798,10 @@ log10_test (void)
 
 static const struct test_f_f_data log1p_test_data[] =
   {
-    TEST_f_f (log1p, -1, minus_infty, DIVIDE_BY_ZERO_EXCEPTION),
-    TEST_f_f (log1p, -2, qnan_value, INVALID_EXCEPTION),
-    TEST_f_f (log1p, -max_value, qnan_value, INVALID_EXCEPTION),
-    TEST_f_f (log1p, minus_infty, qnan_value, INVALID_EXCEPTION),
+    TEST_f_f (log1p, -1, minus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
+    TEST_f_f (log1p, -2, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
+    TEST_f_f (log1p, -max_value, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
+    TEST_f_f (log1p, minus_infty, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
 
     TEST_f_f (log1p, plus_infty, plus_infty),
     TEST_f_f (log1p, qnan_value, qnan_value, NO_INEXACT_EXCEPTION),

math/s_log1pl.c

@@ -9,6 +9,5 @@ __log1pl (long double x)
   __set_errno (ENOSYS);
   return 0.0;
 }
-weak_alias (__log1pl, log1pl)
 
 stub_warning (log1pl)

math/w_log1p.c

@@ -0,0 +1,41 @@
+/* Wrapper for __log1p that handles setting errno.
+   Copyright (C) 2015 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <math.h>
+#include <math_private.h>
+
+double
+__w_log1p (double x)
+{
+  if (__glibc_unlikely (islessequal (x, -1.0)))
+    {
+      if (x == -1.0)
+	__set_errno (ERANGE);
+      else
+	__set_errno (EDOM);
+    }
+
+  return __log1p (x);
+}
+weak_alias (__w_log1p, log1p)
+
+#ifdef NO_LONG_DOUBLE
+strong_alias (__w_log1p, __log1pl)
+weak_alias (__w_log1p, log1pl)
+#endif

math/w_log1pf.c

@@ -0,0 +1,36 @@
+/* Wrapper for __log1pf that handles setting errno.
+   Copyright (C) 2015 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <math.h>
+#include <math_private.h>
+
+float
+__w_log1pf (float x)
+{
+  if (__glibc_unlikely (islessequal (x, -1.0f)))
+    {
+      if (x == -1.0f)
+	__set_errno (ERANGE);
+      else
+	__set_errno (EDOM);
+    }
+
+  return __log1pf (x);
+}
+weak_alias (__w_log1pf, log1pf)

math/w_log1pl.c

@@ -0,0 +1,36 @@
+/* Wrapper for __log1pl that handles setting errno.
+   Copyright (C) 2015 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <math.h>
+#include <math_private.h>
+
+long double
+__w_log1pl (long double x)
+{
+  if (__glibc_unlikely (islessequal (x, -1.0L)))
+    {
+      if (x == -1.0L)
+	__set_errno (ERANGE);
+      else
+	__set_errno (EDOM);
+    }
+
+  return __log1pl (x);
+}
+weak_alias (__w_log1pl, log1pl)

sysdeps/i386/fpu/s_log1p.S

@@ -63,4 +63,3 @@ ENTRY(__log1p)
 	ret
 
 END (__log1p)
-weak_alias (__log1p, log1p)

sysdeps/i386/fpu/s_log1pf.S

@@ -63,4 +63,3 @@ ENTRY(__log1pf)
 	ret
 
 END (__log1pf)
-weak_alias (__log1pf, log1pf)

sysdeps/i386/fpu/s_log1pl.S

@@ -75,4 +75,3 @@ ENTRY(__log1pl)
 	ret
 
 END (__log1pl)
-weak_alias (__log1pl, log1pl)

sysdeps/ia64/fpu/w_log1p.c

@@ -0,0 +1,20 @@
+/* Wrapper for __log1p that handles setting errno.
+   Copyright (C) 2015 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* Nothing to do.
+   errno is set in sysdeps/ia64/fpu/s_log1p.S.  */

sysdeps/ia64/fpu/w_log1pf.c

@@ -0,0 +1,20 @@
+/* Wrapper for __log1pf that handles setting errno.
+   Copyright (C) 2015 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* Nothing to do.
+   errno is set in sysdeps/ia64/fpu/s_log1pf.S.  */

sysdeps/ia64/fpu/w_log1pl.c

@@ -0,0 +1,20 @@
+/* Wrapper for __log1pl that handles setting errno.
+   Copyright (C) 2015 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* Nothing to do.
+   errno is set in sysdeps/ia64/fpu/s_log1pl.S.  */

sysdeps/ieee754/dbl-64/s_log1p.c

@@ -189,8 +189,3 @@ __log1p (double x)
   else
     return k * ln2_hi - ((hfsq - (s * (hfsq + R) + (k * ln2_lo + c))) - f);
 }
-weak_alias (__log1p, log1p)
-#ifdef NO_LONG_DOUBLE
-strong_alias (__log1p, __log1pl)
-weak_alias (__log1p, log1pl)
-#endif

sysdeps/ieee754/flt-32/s_log1pf.c

@@ -96,4 +96,3 @@ __log1pf(float x)
 	if(k==0) return f-(hfsq-s*(hfsq+R)); else
 		 return k*ln2_hi-((hfsq-(s*(hfsq+R)+(k*ln2_lo+c)))-f);
 }
-weak_alias (__log1pf, log1pf)

sysdeps/ieee754/ldbl-128/s_log1pl.c

@@ -253,5 +253,3 @@ __log1pl (long double xm1)
   z = z + e * C1;
   return (z);
 }
-
-weak_alias (__log1pl, log1pl)

sysdeps/ieee754/ldbl-128ibm/s_log1pl.c

@@ -249,5 +249,3 @@ __log1pl (long double xm1)
   z = z + e * C1;
   return (z);
 }
-
-long_double_symbol (libm, __log1pl, log1pl);

sysdeps/ieee754/ldbl-128ibm/w_log1pl.c

@@ -0,0 +1,23 @@
+/* Wrapper for __log1pl that handles setting errno.
+   Copyright (C) 2015 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <math_ldbl_opt.h>
+#undef weak_alias
+#define weak_alias(n,a)
+#include <math/w_log1pl.c>
+long_double_symbol (libm, __w_log1pl, log1pl);

sysdeps/ieee754/ldbl-64-128/s_log1pl.c

@@ -1,5 +1,2 @@
 #include <math_ldbl_opt.h>
-#undef weak_alias
-#define weak_alias(n,a)
 #include <sysdeps/ieee754/ldbl-128/s_log1pl.c>
-long_double_symbol (libm, __log1pl, log1pl);

sysdeps/ieee754/ldbl-64-128/w_log1pl.c

@@ -0,0 +1,23 @@
+/* Wrapper for __log1pl that handles setting errno.
+   Copyright (C) 2015 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <math_ldbl_opt.h>
+#undef weak_alias
+#define weak_alias(n,a)
+#include <math/w_log1pl.c>
+long_double_symbol (libm, __w_log1pl, log1pl);

sysdeps/m68k/m680x0/fpu/s_log1p.c

@@ -1,2 +1,4 @@
 #define	FUNC	log1p
+#undef weak_alias
+#define weak_alias(a,b)
 #include <s_atan.c>

sysdeps/m68k/m680x0/fpu/s_log1pf.c

@@ -1,2 +1,4 @@
 #define	FUNC	log1pf
+#undef weak_alias
+#define weak_alias(a,b)
 #include <s_atanf.c>

sysdeps/m68k/m680x0/fpu/s_log1pl.c

@@ -1,2 +1,4 @@
 #define FUNC log1pl
+#undef weak_alias
+#define weak_alias(a,b)
 #include <s_atanl.c>

sysdeps/x86_64/fpu/s_log1pl.S

@@ -71,4 +71,3 @@ ENTRY(__log1pl)
 	ret
 
 END (__log1pl)
-weak_alias (__log1pl, log1pl)