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authorJoseph Myers <joseph@codesourcery.com>2013-05-24 20:52:55 +0000
committerJoseph Myers <joseph@codesourcery.com>2013-05-24 20:52:55 +0000
commit0323d08657f111267efa47bd448fbf6cd76befe8 (patch)
tree7ebd164c7460e42866c7fe5e31ab9c4b556f23ab
parentdd4259b9f76fa8fd3690a91608d2e3a94e2d6713 (diff)
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Fix ldbl-96 hypotl of subnormals (bug 15529).
-rw-r--r--ChangeLog5
-rw-r--r--NEWS3
-rw-r--r--math/libm-test.inc13
-rw-r--r--sysdeps/ieee754/ldbl-96/e_hypotl.c2
4 files changed, 21 insertions, 2 deletions
diff --git a/ChangeLog b/ChangeLog
index bddd4d5698..6c5111c792 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2013-05-24  Joseph Myers  <joseph@codesourcery.com>
 
+	[BZ #15529]
+	* sysdeps/ieee754/ldbl-96/e_hypotl.c (__ieee754_hypotl): Set high
+	bit of mantissa of 2^16382.
+	* math/libm-test.inc (hypot_test_data): Add more tests.
+
 	* math/libm-test.inc: Add drem and pow10 to list of tested
 	functions.
 	(pow10_test): New function.
diff --git a/NEWS b/NEWS
index a9377eb5ff..c25b62ee4c 100644
--- a/NEWS
+++ b/NEWS
@@ -18,7 +18,8 @@ Version 2.18
   15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335, 15336, 15337,
   15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381, 15394, 15395,
   15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424, 15426, 15429,
-  15441, 15442, 15448, 15480, 15485, 15488, 15490, 15493, 15497, 15506.
+  15441, 15442, 15448, 15480, 15485, 15488, 15490, 15493, 15497, 15506,
+  15529.
 
 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
   #15078).
diff --git a/math/libm-test.inc b/math/libm-test.inc
index 91af668e94..7a6bf09a66 100644
--- a/math/libm-test.inc
+++ b/math/libm-test.inc
@@ -9387,6 +9387,19 @@ static const struct test_ff_f_data hypot_test_data[] =
 #if defined TEST_LDOUBLE && LDBL_MAX_EXP >= 16384 && !defined TEST_INLINE
     TEST_ff_f (hypot, 0x3p16381L, 0x4p16381L, 0x5p16381L),
 #endif
+
+    TEST_ff_f (hypot, 0x1p-149L, 0x1p-149L, 1.9817352931807469938024533350782879785095e-45L, UNDERFLOW_EXCEPTION_FLOAT),
+
+#ifndef TEST_FLOAT
+    TEST_ff_f (hypot, 0x1p-1074L, 0x1p-1074L, 6.9871433705131320800651344656990806305791e-324L, UNDERFLOW_EXCEPTION_DOUBLE),
+#endif
+
+#if defined TEST_LDOUBLE && LDBL_MIN_EXP <= -16381 && !defined TEST_INLINE
+    TEST_ff_f (hypot, 0x1p-16445L, 0x1p-16445L, 5.1550906155442528702558159159596215039925e-4951L, UNDERFLOW_EXCEPTION),
+# if LDBL_MANT_DIG >= 113
+    TEST_ff_f (hypot, 0x1p-16494L, 0x1p-16494L, 9.1572804726500807075521065242888978445857e-4966L, UNDERFLOW_EXCEPTION),
+# endif
+#endif
   };
 
 static void
diff --git a/sysdeps/ieee754/ldbl-96/e_hypotl.c b/sysdeps/ieee754/ldbl-96/e_hypotl.c
index 306f92924c..7895488848 100644
--- a/sysdeps/ieee754/ldbl-96/e_hypotl.c
+++ b/sysdeps/ieee754/ldbl-96/e_hypotl.c
@@ -85,7 +85,7 @@ long double __ieee754_hypotl(long double x, long double y)
 		u_int32_t high,low;
 		GET_LDOUBLE_WORDS(exp,high,low,b);
 		if((high|low)==0) return a;
-		SET_LDOUBLE_WORDS(t1, 0x7ffd, 0, 0);	/* t1=2^16382 */
+		SET_LDOUBLE_WORDS(t1, 0x7ffd, 0x80000000, 0); /* t1=2^16382 */
 		b *= t1;
 		a *= t1;
 		k -= 16382;