From: Carlos O'Donell <carlos@redhat.com>
Date: Wed, 24 Apr 2013 20:29:33 +0000 (-0400)
Subject: math: Use accurate answers for cos and sincos.
X-Git-Tag: glibc-2.18~377
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=418601aa84a2b5cfa21f27bcb81b5c1d0fdf9ccd;p=thirdparty%2Fglibc.git

math: Use accurate answers for cos and sincos.

Use the most accurate hex literals possible for the answers to the
cos and sincos tests that vary according to the error in the rounding
of PI/2.

---

2013-04-24  Carlos O'Donell  <carlos@redhat.com>

	* math/libm-test.inc (cos_test): Use accurate hex constants.
	(sincost_test): Likewise.
---

diff --git a/ChangeLog b/ChangeLog
index f3efba4002b..e6a9a40d523 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2013-04-24  Carlos O'Donell  <carlos@redhat.com>
+
+	* math/libm-test.inc (cos_test): Use accurate hex constants.
+	(sincost_test): Likewise.
+
 2013-04-24  Joseph Myers  <joseph@codesourcery.com>
 
 	* math/libm-test.inc (catan_test): Add more tests.
diff --git a/math/libm-test.inc b/math/libm-test.inc
index 00edede3160..eb9fa710cd8 100644
--- a/math/libm-test.inc
+++ b/math/libm-test.inc
@@ -5413,23 +5413,23 @@ cos_test (void)
      to each type.  */
 #ifdef TEST_FLOAT
   /* 32-bit float.  */
-  TEST_f_f (cos, M_PI_2l, -4.371139000186241438857289400265215e-8L);
+  TEST_f_f (cos, M_PI_2l, -0x1.777a5cp-25L);
 #endif
 #if defined TEST_DOUBLE || (defined TEST_LDOUBLE && LDBL_MANT_DIG == 53)
   /* 64-bit double or 64-bit long double.  */
-  TEST_f_f (cos, M_PI_2l, 6.123233995736765886130329661375001e-17L);
+  TEST_f_f (cos, M_PI_2l, 0x1.1a62633145c07p-54L);
 #endif
 #if defined TEST_LDOUBLE && LDBL_MANT_DIG == 64
   /* 96-bit long double.  */
-  TEST_f_f (cos, M_PI_2l, -2.50827880633416601177866354016537e-20L);
+  TEST_f_f (cos, M_PI_2l, -0xe.ce675d1fc8f8cbbp-69L);
 #endif
 #if defined TEST_LDOUBLE && LDBL_MANT_DIG == 106
   /* 128-bit IBM long double.  */
-  TEST_f_f (cos, M_PI_2l, 1.082856673921913968223746169860580e-32L);
+  TEST_f_f (cos, M_PI_2l, 0x1.c1cd129024e088a67cc74020bcp-107L);
 #endif
 #if defined TEST_LDOUBLE && LDBL_MANT_DIG == 113
   /* 128-bit long double.  */
-  TEST_f_f (cos, M_PI_2l, 4.335905065061890512398522013021675e-35L);
+  TEST_f_f (cos, M_PI_2l, 0x1.cd129024e088a67cc74020bbea64p-115L);
 #endif
 
   TEST_f_f (cos, 0.75L, 0.731688868873820886311838753000084544L);
@@ -12240,23 +12240,23 @@ sincos_test (void)
      to each type.  */
 #ifdef TEST_FLOAT
   /* 32-bit float.  */
-  TEST_extra (sincos, M_PI_2l, 1, -4.371139000186241438857289400265215e-8L);
+  TEST_extra (sincos, M_PI_2l, 1, -0x1.777a5cp-25L);
 #endif
 #if defined TEST_DOUBLE || (defined TEST_LDOUBLE && LDBL_MANT_DIG == 53)
   /* 64-bit double or 64-bit long double.  */
-  TEST_extra (sincos, M_PI_2l, 1, 6.123233995736765886130329661375001e-17L);
+  TEST_extra (sincos, M_PI_2l, 1, 0x1.1a62633145c07p-54L);
 #endif
 #if defined TEST_LDOUBLE && LDBL_MANT_DIG == 64
   /* 96-bit long double.  */
-  TEST_extra (sincos, M_PI_2l, 1, -2.50827880633416601177866354016537e-20L);
+  TEST_extra (sincos, M_PI_2l, 1, -0xe.ce675d1fc8f8cbbp-69L);
 #endif
 #if defined TEST_LDOUBLE && LDBL_MANT_DIG == 106
   /* 128-bit IBM long double.  */
-  TEST_extra (sincos, M_PI_2l, 1, 1.082856673921913968223746169860580e-32L);
+  TEST_extra (sincos, M_PI_2l, 1, 0x1.c1cd129024e088a67cc74020bcp-107L);
 #endif
 #if defined TEST_LDOUBLE && LDBL_MANT_DIG == 113
   /* 128-bit long double.  */
-  TEST_extra (sincos, M_PI_2l, 1, 4.335905065061890512398522013021675e-35L);
+  TEST_extra (sincos, M_PI_2l, 1, 0x1.cd129024e088a67cc74020bbea64p-115L);
 #endif
 
   TEST_extra (sincos, M_PI_6l, 0.5, 0.86602540378443864676372317075293616L);