Fix Bessel function error handling (bug 6807, bug 15901).

17 files changed, 156 insertions, 49 deletions

diff --git a/ChangeLog b/ChangeLog
index dc2fd4c9e9..cf60c7741d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,31 @@
+2013-12-04  Joseph Myers  <joseph@codesourcery.com>
+
+	[BZ #6807]
+	[BZ #15901]
+	* math/w_j0.c (y0): Raise FE_DIVBYZERO on zero argument.
+	* math/w_j0f.c (y0f): Likewise.
+	* math/w_j0l.c (__y0l): Likewise.
+	* math/w_j1.c (y1): Likewise.
+	* math/w_j1f.c (y1f): Likewise.
+	* math/w_j1l.c (__y1l): Likewise
+	* math/w_jn.c (yn): Likewise.
+	* math/w_jnf.c (ynf): Likewise.
+	* sysdeps/ieee754/k_standard.c (__kernel_standard): Use ERANGE for
+	Bessel function pole errors in _POSIX_ mode.  Use NAN as return
+	value for Bessel function domain errors outside _SVID_ mode.
+	Adjust sign of return value for yn (negative integer, 0).
+	* sysdeps/ieee754/ldbl-128/e_jnl.c (__ieee754_ynl): Use division
+	by zero in return for negative x and set sign appropriately for
+	negative n.
+	* sysdeps/ieee754/ldbl-128ibm/e_jnl.c (__ieee754_ynl): Likewise.
+	* sysdeps/ieee754/ldbl-96/e_jnl.c (__ieee754_ynl): Likewise.
+	* math/libm-test.inc (y0_test_data): Add more tests and adjust
+	expectations in error cases.
+	(y1_test_data): Likewise.
+	(yn_test_data): Likewise.
+	* sysdeps/i386/fpu/libm-test-ulps: Update.
+	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
+
 2013-11-12  Ulrich Weigand  <Ulrich.Weigand@de.ibm.com>
 
 	* sysdeps/unix/sysv/linux/powerpc/Makefile (abi-variants): Rename
diff --git a/NEWS b/NEWS
index 146333099d..8da4f4b872 100644
--- a/NEWS
+++ b/NEWS
@@ -9,18 +9,18 @@ Version 2.19
 
 * The following bugs are resolved with this release:
 
-  156, 387, 431, 832, 2801, 6786, 6787, 7003, 9954, 10253, 10278, 11087,
-  11157, 11214, 13028, 13982, 13985, 14029, 14032, 14143, 14155, 14547,
-  14699, 14752, 14876, 14910, 15004, 15048, 15218, 15268, 15277, 15308,
-  15362, 15374, 15400, 15425, 15427, 15483, 15522, 15531, 15532, 15601,
-  15608, 15609, 15610, 15632, 15640, 15670, 15672, 15680, 15681, 15723,
-  15734, 15735, 15736, 15748, 15749, 15754, 15760, 15763, 15764, 15797,
-  15799, 15825, 15844, 15847, 15849, 15855, 15856, 15857, 15859, 15867,
-  15886, 15887, 15890, 15892, 15893, 15895, 15897, 15905, 15909, 15917,
-  15919, 15921, 15923, 15939, 15948, 15963, 15966, 15985, 15988, 15997,
-  16032, 16034, 16036, 16037, 16041, 16055, 16071, 16072, 16074, 16077,
-  16078, 16103, 16112, 16143, 16144, 16146, 16150, 16151, 16153, 16167,
-  16172, 16195, 16214, 16245, 16271, 16283, 16289.
+  156, 387, 431, 832, 2801, 6786, 6787, 6807, 7003, 9954, 10253, 10278,
+  11087, 11157, 11214, 13028, 13982, 13985, 14029, 14032, 14143, 14155,
+  14547, 14699, 14752, 14876, 14910, 15004, 15048, 15218, 15268, 15277,
+  15308, 15362, 15374, 15400, 15425, 15427, 15483, 15522, 15531, 15532,
+  15601, 15608, 15609, 15610, 15632, 15640, 15670, 15672, 15680, 15681,
+  15723, 15734, 15735, 15736, 15748, 15749, 15754, 15760, 15763, 15764,
+  15797, 15799, 15825, 15844, 15847, 15849, 15855, 15856, 15857, 15859,
+  15867, 15886, 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905,
+  15909, 15917, 15919, 15921, 15923, 15939, 15948, 15963, 15966, 15985,
+  15988, 15997, 16032, 16034, 16036, 16037, 16041, 16055, 16071, 16072,
+  16074, 16077, 16078, 16103, 16112, 16143, 16144, 16146, 16150, 16151,
+  16153, 16167, 16172, 16195, 16214, 16245, 16271, 16283, 16289.
 
 * The public headers no longer use __unused nor __block.  This change is to
   support compiling programs that are derived from BSD sources and use
diff --git a/math/libm-test.inc b/math/libm-test.inc
index 2e3e684ca3..a4b2d51ef9 100644
--- a/math/libm-test.inc
+++ b/math/libm-test.inc
@@ -14278,9 +14278,11 @@ trunc_test (void)
 static const struct test_f_f_data y0_test_data[] =
   {
     /* y0 is the Bessel function of the second kind of order 0 */
-    TEST_f_f (y0, -1.0, minus_infty, INVALID_EXCEPTION|ERRNO_EDOM),
-    TEST_f_f (y0, -max_value, minus_infty, INVALID_EXCEPTION|ERRNO_EDOM),
-    TEST_f_f (y0, 0.0, minus_infty),
+    TEST_f_f (y0, -1.0, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
+    TEST_f_f (y0, -max_value, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
+    TEST_f_f (y0, minus_infty, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
+    TEST_f_f (y0, 0.0, minus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
+    TEST_f_f (y0, -0.0, minus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
     TEST_f_f (y0, qnan_value, qnan_value, NO_INEXACT_EXCEPTION),
     TEST_f_f (y0, plus_infty, 0),
 
@@ -14329,9 +14331,11 @@ y0_test (void)
 static const struct test_f_f_data y1_test_data[] =
   {
     /* y1 is the Bessel function of the second kind of order 1 */
-    TEST_f_f (y1, -1.0, minus_infty, INVALID_EXCEPTION|ERRNO_EDOM),
-    TEST_f_f (y1, -max_value, minus_infty, INVALID_EXCEPTION|ERRNO_EDOM),
-    TEST_f_f (y1, 0.0, minus_infty),
+    TEST_f_f (y1, -1.0, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
+    TEST_f_f (y1, -max_value, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
+    TEST_f_f (y1, minus_infty, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
+    TEST_f_f (y1, 0.0, minus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
+    TEST_f_f (y1, -0.0, minus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
     TEST_f_f (y1, plus_infty, 0),
     TEST_f_f (y1, qnan_value, qnan_value, NO_INEXACT_EXCEPTION),
 
@@ -14381,9 +14385,11 @@ static const struct test_if_f_data yn_test_data[] =
   {
     /* yn is the Bessel function of the second kind of order n */
     /* yn (0, x) == y0 (x)  */
-    TEST_if_f (yn, 0, -1.0, minus_infty, INVALID_EXCEPTION|ERRNO_EDOM),
-    TEST_if_f (yn, 0, -max_value, minus_infty, INVALID_EXCEPTION|ERRNO_EDOM),
-    TEST_if_f (yn, 0, 0.0, minus_infty),
+    TEST_if_f (yn, 0, -1.0, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
+    TEST_if_f (yn, 0, -max_value, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
+    TEST_if_f (yn, 0, minus_infty, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
+    TEST_if_f (yn, 0, 0.0, minus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
+    TEST_if_f (yn, 0, -0.0, minus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
     TEST_if_f (yn, 0, qnan_value, qnan_value, NO_INEXACT_EXCEPTION),
     TEST_if_f (yn, 0, plus_infty, 0),
 
@@ -14396,8 +14402,11 @@ static const struct test_if_f_data yn_test_data[] =
     TEST_if_f (yn, 0, 10.0, 0.0556711672835993914244598774101900481L),
 
     /* yn (1, x) == y1 (x)  */
-    TEST_if_f (yn, 1, -1.0, minus_infty, INVALID_EXCEPTION|ERRNO_EDOM),
-    TEST_if_f (yn, 1, 0.0, minus_infty),
+    TEST_if_f (yn, 1, -1.0, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
+    TEST_if_f (yn, 1, -max_value, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
+    TEST_if_f (yn, 1, minus_infty, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
+    TEST_if_f (yn, 1, 0.0, minus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
+    TEST_if_f (yn, 1, -0.0, minus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
     TEST_if_f (yn, 1, plus_infty, 0),
     TEST_if_f (yn, 1, qnan_value, qnan_value, NO_INEXACT_EXCEPTION),
 
@@ -14409,7 +14418,40 @@ static const struct test_if_f_data yn_test_data[] =
     TEST_if_f (yn, 1, 8.0, -0.158060461731247494255555266187483550L),
     TEST_if_f (yn, 1, 10.0, 0.249015424206953883923283474663222803L),
 
+    /* yn (-1, x) == -y1 (x).  */
+    TEST_if_f (yn, -1, -1.0, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
+    TEST_if_f (yn, -1, -max_value, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
+    TEST_if_f (yn, -1, minus_infty, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
+    TEST_if_f (yn, -1, 0.0, plus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
+    TEST_if_f (yn, -1, -0.0, plus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
+    TEST_if_f (yn, -1, plus_infty, minus_zero),
+    TEST_if_f (yn, -1, qnan_value, qnan_value, NO_INEXACT_EXCEPTION),
+    TEST_if_f (yn, -1, 1.0, 0.781212821300288716547150000047964821L),
+
+    /* yn (2, x).  */
+    TEST_if_f (yn, 2, -1.0, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
+    TEST_if_f (yn, 2, -max_value, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
+    TEST_if_f (yn, 2, minus_infty, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
+    TEST_if_f (yn, 2, 0.0, minus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
+    TEST_if_f (yn, 2, -0.0, minus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
+    TEST_if_f (yn, 2, plus_infty, 0),
+    TEST_if_f (yn, 2, qnan_value, qnan_value, NO_INEXACT_EXCEPTION),
+
+    /* yn (-2, x) == yn (2, x).  */
+    TEST_if_f (yn, -2, -1.0, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
+    TEST_if_f (yn, -2, -max_value, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
+    TEST_if_f (yn, -2, minus_infty, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
+    TEST_if_f (yn, -2, 0.0, minus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
+    TEST_if_f (yn, -2, -0.0, minus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
+    TEST_if_f (yn, -2, plus_infty, 0),
+    TEST_if_f (yn, -2, qnan_value, qnan_value, NO_INEXACT_EXCEPTION),
+
     /* yn (3, x)  */
+    TEST_if_f (yn, 3, -1.0, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
+    TEST_if_f (yn, 3, -max_value, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
+    TEST_if_f (yn, 3, minus_infty, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
+    TEST_if_f (yn, 3, 0.0, minus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
+    TEST_if_f (yn, 3, -0.0, minus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
     TEST_if_f (yn, 3, plus_infty, 0),
     TEST_if_f (yn, 3, qnan_value, qnan_value, NO_INEXACT_EXCEPTION),
 
@@ -14429,6 +14471,8 @@ static const struct test_if_f_data yn_test_data[] =
     TEST_if_f (yn, 10, 2.0, -129184.542208039282635913145923304214L),
     TEST_if_f (yn, 10, 10.0, -0.359814152183402722051986577343560609L),
 
+    TEST_if_f (yn, -10, 1.0, -121618014.278689189288130426667971145L),
+
     /* Check whether yn returns correct value for LDBL_MIN, DBL_MIN,
        and FLT_MIN.  See Bug 14173.  */
     TEST_if_f (yn, 10, min_value, minus_infty, OVERFLOW_EXCEPTION|ERRNO_ERANGE),
diff --git a/math/w_j0.c b/math/w_j0.c
index 53671c3306..0849abbc35 100644
--- a/math/w_j0.c
+++ b/math/w_j0.c
@@ -51,8 +51,11 @@ y0 (double x)
 	  return __kernel_standard (x, x, 9);
 	}
       else if (x == 0.0)
-	/* d = -one/(x-x) */
-	return __kernel_standard (x, x, 8);
+	{
+	  /* d = -one/(x-x) */
+	  feraiseexcept (FE_DIVBYZERO);
+	  return __kernel_standard (x, x, 8);
+	}
       else if (_LIB_VERSION != _POSIX_)
 	/* y0(x>X_TLOSS) */
 	return __kernel_standard (x, x, 35);
diff --git a/math/w_j0f.c b/math/w_j0f.c
index c9a6c53fff..ef309d2092 100644
--- a/math/w_j0f.c
+++ b/math/w_j0f.c
@@ -49,8 +49,11 @@ y0f (float x)
 	  return __kernel_standard_f (x, x, 109);
 	}
       else if (x == 0.0f)
-	/* d = -one/(x-x) */
-	return __kernel_standard_f (x, x, 108);
+	{
+	  /* d = -one/(x-x) */
+	  feraiseexcept (FE_DIVBYZERO);
+	  return __kernel_standard_f (x, x, 108);
+	}
       else if (_LIB_VERSION != _POSIX_)
 	/* y0(x>X_TLOSS) */
 	return __kernel_standard_f (x, x, 135);
diff --git a/math/w_j0l.c b/math/w_j0l.c
index 717253c001..01cd91cdb7 100644
--- a/math/w_j0l.c
+++ b/math/w_j0l.c
@@ -49,8 +49,11 @@ __y0l (long double x)
 	  return __kernel_standard_l (x, x, 209);
 	}
       else if (x == 0.0L)
-	/* d = -one/(x-x) */
-	return __kernel_standard_l (x, x, 208);
+	{
+	  /* d = -one/(x-x) */
+	  feraiseexcept (FE_DIVBYZERO);
+	  return __kernel_standard_l (x, x, 208);
+	}
       else if (_LIB_VERSION != _POSIX_)
 	/* y0(x>X_TLOSS) */
 	return __kernel_standard_l (x, x, 235);
diff --git a/math/w_j1.c b/math/w_j1.c
index 743c940b14..a9fb7aebbe 100644
--- a/math/w_j1.c
+++ b/math/w_j1.c
@@ -51,8 +51,11 @@ y1 (double x)
 	  return __kernel_standard (x, x, 11);
 	}
       else if (x == 0.0)
-	/* d = -one/(x-x) */
-	return __kernel_standard (x, x, 10);
+	{
+	  /* d = -one/(x-x) */
+	  feraiseexcept (FE_DIVBYZERO);
+	  return __kernel_standard (x, x, 10);
+	}
       else if (_LIB_VERSION != _POSIX_)
 	/* y1(x>X_TLOSS) */
 	return __kernel_standard (x, x, 37);
diff --git a/math/w_j1f.c b/math/w_j1f.c
index bf7deb09f7..f70913d5ae 100644
--- a/math/w_j1f.c
+++ b/math/w_j1f.c
@@ -49,8 +49,11 @@ y1f (float x)
 	  return __kernel_standard_f (x, x, 111);
 	}
       else if (x == 0.0f)
-	/* d = -one/(x-x) */
-	return __kernel_standard_f (x, x, 110);
+	{
+	  /* d = -one/(x-x) */
+	  feraiseexcept (FE_DIVBYZERO);
+	  return __kernel_standard_f (x, x, 110);
+	}
       else if (_LIB_VERSION != _POSIX_)
 	/* y1(x>X_TLOSS) */
 	return __kernel_standard_f (x, x, 137);
diff --git a/math/w_j1l.c b/math/w_j1l.c
index c4f8111ca2..e4242ec218 100644
--- a/math/w_j1l.c
+++ b/math/w_j1l.c
@@ -49,8 +49,11 @@ __y1l (long double x)
 	  return __kernel_standard_l (x, x, 211);
 	}
       else if (x == 0.0L)
-	/* d = -one/(x-x) */
-	return __kernel_standard_l (x, x, 210);
+	{
+	  /* d = -one/(x-x) */
+	  feraiseexcept (FE_DIVBYZERO);
+	  return __kernel_standard_l (x, x, 210);
+	}
       else if (_LIB_VERSION != _POSIX_)
 	/* y1(x>X_TLOSS) */
 	return __kernel_standard_l (x, x, 237);
diff --git a/math/w_jn.c b/math/w_jn.c
index e2e69b4239..e9179835ba 100644
--- a/math/w_jn.c
+++ b/math/w_jn.c
@@ -51,8 +51,11 @@ yn (int n, double x)
 	  return __kernel_standard (n, x, 13);
 	}
       else if (x == 0.0)
-	/* d = -one/(x-x) */
-	return __kernel_standard (n, x, 12);
+	{
+	  /* d = -one/(x-x) */
+	  feraiseexcept (FE_DIVBYZERO);
+	  return __kernel_standard (n, x, 12);
+	}
       else if (_LIB_VERSION != _POSIX_)
 	/* yn(n,x>X_TLOSS) */
 	return __kernel_standard (n, x, 39);
diff --git a/math/w_jnf.c b/math/w_jnf.c
index c9114e7b09..cb1aab8e73 100644
--- a/math/w_jnf.c
+++ b/math/w_jnf.c
@@ -49,8 +49,11 @@ ynf (int n, float x)
 	  return __kernel_standard_f (n, x, 113);
 	}
       else if (x == 0.0)
-	/* d = -one/(x-x) */
-	return __kernel_standard_f (n, x, 112);
+	{
+	  /* d = -one/(x-x) */
+	  feraiseexcept (FE_DIVBYZERO);
+	  return __kernel_standard_f (n, x, 112);
+	}
       else if (_LIB_VERSION != _POSIX_)
 	/* yn(n,x>X_TLOSS) */
 	return __kernel_standard_f (n, x, 139);
diff --git a/sysdeps/i386/fpu/libm-test-ulps b/sysdeps/i386/fpu/libm-test-ulps
index 4ed02a2797..cf7c5e83bf 100644
--- a/sysdeps/i386/fpu/libm-test-ulps
+++ b/sysdeps/i386/fpu/libm-test-ulps
@@ -7563,6 +7563,9 @@ float: 2
 ifloat: 2
 
 # yn
+Test "yn (-10, 1.0)":
+float: 2
+ifloat: 2
 Test "yn (0, 0.125)":
 ildouble: 1
 ldouble: 1
diff --git a/sysdeps/ieee754/k_standard.c b/sysdeps/ieee754/k_standard.c
index 4a0d82d1a6..5399c6682d 100644
--- a/sysdeps/ieee754/k_standard.c
+++ b/sysdeps/ieee754/k_standard.c
@@ -248,7 +248,7 @@ __kernel_standard(double x, double y, int type)
 		else
 		  exc.retval = -HUGE_VAL;
 		if (_LIB_VERSION == _POSIX_)
-		  __set_errno (EDOM);
+		  __set_errno (ERANGE);
 		else if (!matherr(&exc)) {
 		  if (_LIB_VERSION == _SVID_) {
 			(void) WRITE2("y0: DOMAIN error\n", 17);
@@ -265,7 +265,7 @@ __kernel_standard(double x, double y, int type)
 		if (_LIB_VERSION == _SVID_)
 		  exc.retval = -HUGE;
 		else
-		  exc.retval = -HUGE_VAL;
+		  exc.retval = NAN;
 		if (_LIB_VERSION == _POSIX_)
 		  __set_errno (EDOM);
 		else if (!matherr(&exc)) {
@@ -286,7 +286,7 @@ __kernel_standard(double x, double y, int type)
 		else
 		  exc.retval = -HUGE_VAL;
 		if (_LIB_VERSION == _POSIX_)
-		  __set_errno (EDOM);
+		  __set_errno (ERANGE);
 		else if (!matherr(&exc)) {
 		  if (_LIB_VERSION == _SVID_) {
 			(void) WRITE2("y1: DOMAIN error\n", 17);
@@ -303,7 +303,7 @@ __kernel_standard(double x, double y, int type)
 		if (_LIB_VERSION == _SVID_)
 		  exc.retval = -HUGE;
 		else
-		  exc.retval = -HUGE_VAL;
+		  exc.retval = NAN;
 		if (_LIB_VERSION == _POSIX_)
 		  __set_errno (EDOM);
 		else if (!matherr(&exc)) {
@@ -322,9 +322,11 @@ __kernel_standard(double x, double y, int type)
 		if (_LIB_VERSION == _SVID_)
 		  exc.retval = -HUGE;
 		else
-		  exc.retval = -HUGE_VAL;
+		  exc.retval = ((x < 0 && ((int) x & 1) != 0)
+				? HUGE_VAL
+				: -HUGE_VAL);
 		if (_LIB_VERSION == _POSIX_)
-		  __set_errno (EDOM);
+		  __set_errno (ERANGE);
 		else if (!matherr(&exc)) {
 		  if (_LIB_VERSION == _SVID_) {
 			(void) WRITE2("yn: DOMAIN error\n", 17);
@@ -341,7 +343,7 @@ __kernel_standard(double x, double y, int type)
 		if (_LIB_VERSION == _SVID_)
 		  exc.retval = -HUGE;
 		else
-		  exc.retval = -HUGE_VAL;
+		  exc.retval = NAN;
 		if (_LIB_VERSION == _POSIX_)
 		  __set_errno (EDOM);
 		else if (!matherr(&exc)) {
diff --git a/sysdeps/ieee754/ldbl-128/e_jnl.c b/sysdeps/ieee754/ldbl-128/e_jnl.c
index 70d5672fd9..c2a49235c3 100644
--- a/sysdeps/ieee754/ldbl-128/e_jnl.c
+++ b/sysdeps/ieee754/ldbl-128/e_jnl.c
@@ -316,7 +316,7 @@ __ieee754_ynl (int n, long double x)
   if (x <= 0.0L)
     {
       if (x == 0.0L)
-	return -HUGE_VALL + x;
+	return ((n < 0 && (n & 1) != 0) ? 1.0L : -1.0L) / 0.0L;
       if (se & 0x80000000)
 	return zero / (zero * x);
     }
diff --git a/sysdeps/ieee754/ldbl-128ibm/e_jnl.c b/sysdeps/ieee754/ldbl-128ibm/e_jnl.c
index 817977da5b..6761a0d26f 100644
--- a/sysdeps/ieee754/ldbl-128ibm/e_jnl.c
+++ b/sysdeps/ieee754/ldbl-128ibm/e_jnl.c
@@ -316,7 +316,7 @@ __ieee754_ynl (int n, long double x)
   if (x <= 0.0L)
     {
       if (x == 0.0L)
-	return -HUGE_VALL + x;
+	return ((n < 0 && (n & 1) != 0) ? 1.0L : -1.0L) / 0.0L;
       if (se & 0x80000000)
 	return zero / (zero * x);
     }
diff --git a/sysdeps/ieee754/ldbl-96/e_jnl.c b/sysdeps/ieee754/ldbl-96/e_jnl.c
index 58a9107f7d..fa8e27efec 100644
--- a/sysdeps/ieee754/ldbl-96/e_jnl.c
+++ b/sysdeps/ieee754/ldbl-96/e_jnl.c
@@ -302,7 +302,8 @@ __ieee754_ynl (int n, long double x)
   if (__builtin_expect ((ix == 0x7fff) && ((i0 & 0x7fffffff) != 0), 0))
     return x + x;
   if (__builtin_expect ((ix | i0 | i1) == 0, 0))
-    return -HUGE_VALL + x;  /* -inf and overflow exception.  */
+    /* -inf or inf and divide-by-zero exception.  */
+    return ((n < 0 && (n & 1) != 0) ? 1.0L : -1.0L) / 0.0L;
   if (__builtin_expect (se & 0x8000, 0))
     return zero / (zero * x);
   sign = 1;
diff --git a/sysdeps/x86_64/fpu/libm-test-ulps b/sysdeps/x86_64/fpu/libm-test-ulps
index e78514869d..b3b40ef9fc 100644
--- a/sysdeps/x86_64/fpu/libm-test-ulps
+++ b/sysdeps/x86_64/fpu/libm-test-ulps
@@ -8615,6 +8615,11 @@ idouble: 1
 ifloat: 2
 
 # yn
+Test "yn (-10, 1.0)":
+double: 1
+float: 2
+idouble: 1
+ifloat: 2
 Test "yn (0, 0.125)":
 ildouble: 1
 ldouble: 1