GNU C Library master sources branch master updated. glibc-2.22-321-gcec7d28

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Mon Oct 5 22:55:00 GMT 2015


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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=cec7d28af8ccb40dbf82d99efa13a040b31b9387

commit cec7d28af8ccb40dbf82d99efa13a040b31b9387
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Mon Oct 5 22:53:50 2015 +0000

    Fix ldbl-96 lroundl just below powers of 2 (bug 19071).
    
    The ldbl-96 version of lroundl is incorrect for systems with 64-bit
    long when the argument's absolute value is just below a power of 2,
    2^32 or more, and rounds up to the next integer; in such cases, it
    returns 0.  The problem is incrementing the high part of the mantissa
    loses the high bit of the value (which is not an issue for any other
    floating-point format, and is handled specially in lround when the bit
    corresponding to 0.5 was in the high part rather than the low part).
    
    This patch fixes this in a similar way to that used in llroundl:
    storing the high part in an unsigned long variable before incrementing
    it, so problems cannot occur in the case when this code is reachable.
    I improved test coverage for both lround and llround by making them
    use the same test inputs (appropriately conditioned on the size of
    long in the lround case) - complete with the same comments, to make
    comparison as easy as possible.  (This test coverage improvement was
    how I found the lroundl bug.)
    
    Tested for x86_64 and x86.
    
    	[BZ #19071]
    	* sysdeps/ieee754/ldbl-96/s_lroundl.c (__lroundl): Use unsigned
    	long int variable to store possibly incremented high part of
    	mantissa.
    	* math/libm-test.inc (lround_test_data): Add tests used for
    	llround.  Use [LONG_MAX > 0x7fffffff] consistently as condition
    	for tests requiring 64-bit long.  Do not condition tests on
    	[TEST_FLOAT] unnecessarily.
    	(llround_test_data): Add tests used for lround.  Add another
    	expectation for the "inexact" exception.  Do not condition tests
    	on [TEST_FLOAT] unnecessarily.

diff --git a/ChangeLog b/ChangeLog
index a86b74f..77d0652 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,17 @@
 2015-10-05  Joseph Myers  <joseph@codesourcery.com>
 
+	[BZ #19071]
+	* sysdeps/ieee754/ldbl-96/s_lroundl.c (__lroundl): Use unsigned
+	long int variable to store possibly incremented high part of
+	mantissa.
+	* math/libm-test.inc (lround_test_data): Add tests used for
+	llround.  Use [LONG_MAX > 0x7fffffff] consistently as condition
+	for tests requiring 64-bit long.  Do not condition tests on
+	[TEST_FLOAT] unnecessarily.
+	(llround_test_data): Add tests used for lround.  Add another
+	expectation for the "inexact" exception.  Do not condition tests
+	on [TEST_FLOAT] unnecessarily.
+
 	[BZ #887]
 	[BZ #19049]
 	[BZ #19050]
diff --git a/NEWS b/NEWS
index 8d702c7..d14efbd 100644
--- a/NEWS
+++ b/NEWS
@@ -17,7 +17,8 @@ Version 2.23
   18757, 18778, 18781, 18787, 18789, 18790, 18795, 18796, 18803, 18820,
   18823, 18824, 18825, 18857, 18863, 18870, 18872, 18873, 18875, 18887,
   18921, 18951, 18952, 18956, 18961, 18966, 18967, 18969, 18970, 18977,
-  18980, 18981, 18985, 19003, 19016, 19032, 19046, 19049, 19050, 19059.
+  18980, 18981, 18985, 19003, 19016, 19032, 19046, 19049, 19050, 19059,
+  19071.
 
 * The obsolete header <regexp.h> has been removed.  Programs that require
   this header must be updated to use <regex.h> instead.
diff --git a/math/libm-test.inc b/math/libm-test.inc
index ac1fe85..d3964ed 100644
--- a/math/libm-test.inc
+++ b/math/libm-test.inc
@@ -8099,25 +8099,168 @@ static const struct test_f_l_data lround_test_data[] =
     TEST_f_l (lround, 22514.5, 22515, ERRNO_UNCHANGED),
     TEST_f_l (lround, -22514.5, -22515, ERRNO_UNCHANGED),
     TEST_f_l (lround, 1071930.0008, 1071930, ERRNO_UNCHANGED),
+    TEST_f_l (lround, 2097152.5, 2097153, ERRNO_UNCHANGED),
+    TEST_f_l (lround, -2097152.5, -2097153, ERRNO_UNCHANGED),
 #ifndef TEST_FLOAT
     TEST_f_l (lround, 1073741824.01, 1073741824, ERRNO_UNCHANGED),
-# if LONG_MAX > 281474976710656
+# if LONG_MAX > 0x7fffffff
+    TEST_f_l (lround, 34359738368.5, 34359738369ll, ERRNO_UNCHANGED),
+    TEST_f_l (lround, -34359738368.5, -34359738369ll, ERRNO_UNCHANGED),
+    TEST_f_l (lround, -3.65309740835E17, -365309740835000000LL, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
     TEST_f_l (lround, 281474976710656.025, 281474976710656, ERRNO_UNCHANGED),
     TEST_f_l (lround, 18014398509481974, 18014398509481974, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
 # endif
-    TEST_f_l (lround, 2097152.5, 2097153, ERRNO_UNCHANGED),
-    TEST_f_l (lround, -2097152.5, -2097153, ERRNO_UNCHANGED),
+#endif
+
+    /* Test boundary conditions.  */
+    /* 0x1FFFFF */
+    TEST_f_l (lround, 2097151.0, 2097151LL, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    /* 0x800000 */
+    TEST_f_l (lround, 8388608.0, 8388608LL, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    /* 0x1000000 */
+    TEST_f_l (lround, 16777216.0, 16777216LL, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+#if LONG_MAX > 0x7fffffff
+    /* 0x20000000000 */
+    TEST_f_l (lround, 2199023255552.0, 2199023255552LL, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    /* 0x40000000000 */
+    TEST_f_l (lround, 4398046511104.0, 4398046511104LL, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    /* 0x1000000000000 */
+    TEST_f_l (lround, 281474976710656.0, 281474976710656LL, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    /* 0x10000000000000 */
+    TEST_f_l (lround, 4503599627370496.0, 4503599627370496LL, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    /* 0x10000080000000 */
+    TEST_f_l (lround, 4503601774854144.0, 4503601774854144LL, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    /* 0x20000000000000 */
+    TEST_f_l (lround, 9007199254740992.0, 9007199254740992LL, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    /* 0x80000000000000 */
+    TEST_f_l (lround, 36028797018963968.0, 36028797018963968LL, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    /* 0x100000000000000 */
+    TEST_f_l (lround, 72057594037927936.0, 72057594037927936LL, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+#endif
+
+#ifndef TEST_FLOAT
+# if LONG_MAX > 0x7fffffff
+    /* 0x100000000 */
+    TEST_f_l (lround, 4294967295.5, 4294967296LL, ERRNO_UNCHANGED),
+    /* 0x200000000 */
+    TEST_f_l (lround, 8589934591.5, 8589934592LL, ERRNO_UNCHANGED),
+# endif
+
     /* nextafter(0.5,-1)  */
     TEST_f_l (lround, 0x1.fffffffffffffp-2, 0, ERRNO_UNCHANGED),
     /* nextafter(-0.5,1)  */
     TEST_f_l (lround, -0x1.fffffffffffffp-2, 0, ERRNO_UNCHANGED),
-#else
-    /* nextafter(0.5,-1)  */
+# if LONG_MAX > 0x7fffffff
+    /* On PowerPC an exponent of '52' is the largest incrementally
+     * representable sequence of whole-numbers in the 'double' range.  We test
+     * lround to make sure that a guard bit set during the lround operation
+     * hasn't forced an erroneous shift giving us an incorrect result.  The odd
+     * numbers between +-(2^52+1 and 2^53-1) are affected since they have the
+     * rightmost bit set.  */
+    /* +-(2^52+1)  */
+    TEST_f_l (lround, 0x1.0000000000001p+52,4503599627370497LL, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_l (lround, -0x1.0000000000001p+52,-4503599627370497LL, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    /* +-(2^53-1): Input is the last (positive and negative) incrementally
+     * representable whole-number in the 'double' range that might round
+     * erroneously.  */
+    TEST_f_l (lround, 0x1.fffffffffffffp+52, 9007199254740991LL, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_l (lround, -0x1.fffffffffffffp+52, -9007199254740991LL, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+# endif
+#endif
     TEST_f_l (lround, 0x1.fffffp-2, 0, ERRNO_UNCHANGED),
-    /* nextafter(-0.5,1)  */
+    /* nextafter(0.5,-1)  */
+    TEST_f_l (lround, 0x1.fffffep-2, 0, ERRNO_UNCHANGED),
     TEST_f_l (lround, -0x1.fffffp-2, 0, ERRNO_UNCHANGED),
+    /* nextafter(-0.5,1)  */
+    TEST_f_l (lround, -0x1.fffffep-2, 0, ERRNO_UNCHANGED),
     TEST_f_l (lround, 0x1.fffffep+23, 16777215, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
     TEST_f_l (lround, -0x1.fffffep+23, -16777215, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    /* As above, on PowerPC an exponent of '23' is the largest incrementally
+     * representable sequence of whole-numbers in the 'float' range.
+     * Likewise, numbers between +-(2^23+1 and 2^24-1) are affected.  */
+    TEST_f_l (lround, 0x1.000002p+23,8388609, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_l (lround, -0x1.000002p+23,-8388609, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_l (lround, 0x1.fffffep+23, 16777215, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_l (lround, -0x1.fffffep+23, -16777215, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+
+#if LONG_MAX > 0x7fffffff
+# ifdef TEST_LDOUBLE
+    /* The input can only be represented in long double.  */
+    TEST_f_l (lround, 4503599627370495.5L, 4503599627370496LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, 4503599627370496.25L, 4503599627370496LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, 4503599627370496.5L, 4503599627370497LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, 4503599627370496.75L, 4503599627370497LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, 4503599627370497.5L, 4503599627370498LL, ERRNO_UNCHANGED),
+
+#  if LDBL_MANT_DIG > 100
+    TEST_f_l (lround, 4503599627370495.4999999999999L, 4503599627370495LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, 4503599627370496.4999999999999L, 4503599627370496LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, 4503599627370497.4999999999999L, 4503599627370497LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, 4503599627370494.5000000000001L, 4503599627370495LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, 4503599627370495.5000000000001L, 4503599627370496LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, 4503599627370496.5000000000001L, 4503599627370497LL, ERRNO_UNCHANGED),
+
+    TEST_f_l (lround, -4503599627370495.4999999999999L, -4503599627370495LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, -4503599627370496.4999999999999L, -4503599627370496LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, -4503599627370497.4999999999999L, -4503599627370497LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, -4503599627370494.5000000000001L, -4503599627370495LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, -4503599627370495.5000000000001L, -4503599627370496LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, -4503599627370496.5000000000001L, -4503599627370497LL, ERRNO_UNCHANGED),
+#  endif
+
+    TEST_f_l (lround, -4503599627370495.5L, -4503599627370496LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, -4503599627370496.25L, -4503599627370496LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, -4503599627370496.5L, -4503599627370497LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, -4503599627370496.75L, -4503599627370497LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, -4503599627370497.5L, -4503599627370498LL, ERRNO_UNCHANGED),
+
+    TEST_f_l (lround, 9007199254740991.5L, 9007199254740992LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, 9007199254740992.25L, 9007199254740992LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, 9007199254740992.5L, 9007199254740993LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, 9007199254740992.75L, 9007199254740993LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, 9007199254740993.5L, 9007199254740994LL, ERRNO_UNCHANGED),
+
+#  if LDBL_MANT_DIG > 100
+    TEST_f_l (lround, 9007199254740991.4999999999999L, 9007199254740991LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, 9007199254740992.4999999999999L, 9007199254740992LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, 9007199254740993.4999999999999L, 9007199254740993LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, 9007199254740991.5000000000001L, 9007199254740992LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, 9007199254740992.5000000000001L, 9007199254740993LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, 9007199254740993.5000000000001L, 9007199254740994LL, ERRNO_UNCHANGED),
+
+    TEST_f_l (lround, -9007199254740991.4999999999999L, -9007199254740991LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, -9007199254740992.4999999999999L, -9007199254740992LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, -9007199254740993.4999999999999L, -9007199254740993LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, -9007199254740991.5000000000001L, -9007199254740992LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, -9007199254740992.5000000000001L, -9007199254740993LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, -9007199254740993.5000000000001L, -9007199254740994LL, ERRNO_UNCHANGED),
+#  endif
+
+    TEST_f_l (lround, -9007199254740991.5L, -9007199254740992LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, -9007199254740992.25L, -9007199254740992LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, -9007199254740992.5L, -9007199254740993LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, -9007199254740992.75L, -9007199254740993LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, -9007199254740993.5L, -9007199254740994LL, ERRNO_UNCHANGED),
+
+    TEST_f_l (lround, 72057594037927935.5L, 72057594037927936LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, 72057594037927936.25L, 72057594037927936LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, 72057594037927936.5L, 72057594037927937LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, 72057594037927936.75L, 72057594037927937LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, 72057594037927937.5L, 72057594037927938LL, ERRNO_UNCHANGED),
+
+    TEST_f_l (lround, -72057594037927935.5L, -72057594037927936LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, -72057594037927936.25L, -72057594037927936LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, -72057594037927936.5L, -72057594037927937LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, -72057594037927936.75L, -72057594037927937LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, -72057594037927937.5L, -72057594037927938LL, ERRNO_UNCHANGED),
+
+    TEST_f_l (lround, 9223372036854775806.25L, 9223372036854775806LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, -9223372036854775806.25L, -9223372036854775806LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, 9223372036854775806.5L, 9223372036854775807LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, -9223372036854775806.5L, -9223372036854775807LL, ERRNO_UNCHANGED),
+    TEST_f_l (lround, 9223372036854775807.0L, 9223372036854775807LL, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_l (lround, -9223372036854775807.0L, -9223372036854775807LL, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+# endif
 #endif
   };
 
@@ -8147,12 +8290,15 @@ static const struct test_f_L_data llround_test_data[] =
     TEST_f_L (llround, 22514.5, 22515, ERRNO_UNCHANGED),
     TEST_f_L (llround, -22514.5, -22515, ERRNO_UNCHANGED),
     TEST_f_L (llround, 1071930.0008, 1071930, ERRNO_UNCHANGED),
-#ifndef TEST_FLOAT
     TEST_f_L (llround, 2097152.5, 2097153, ERRNO_UNCHANGED),
     TEST_f_L (llround, -2097152.5, -2097153, ERRNO_UNCHANGED),
+#ifndef TEST_FLOAT
+    TEST_f_L (llround, 1073741824.01, 1073741824, ERRNO_UNCHANGED),
     TEST_f_L (llround, 34359738368.5, 34359738369ll, ERRNO_UNCHANGED),
     TEST_f_L (llround, -34359738368.5, -34359738369ll, ERRNO_UNCHANGED),
-    TEST_f_L (llround, -3.65309740835E17, -365309740835000000LL, ERRNO_UNCHANGED),
+    TEST_f_L (llround, -3.65309740835E17, -365309740835000000LL, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_L (llround, 281474976710656.025, 281474976710656, ERRNO_UNCHANGED),
+    TEST_f_L (llround, 18014398509481974, 18014398509481974, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
 #endif
 
     /* Test boundary conditions.  */
@@ -8203,11 +8349,15 @@ static const struct test_f_L_data llround_test_data[] =
      * erroneously.  */
     TEST_f_L (llround, 0x1.fffffffffffffp+52, 9007199254740991LL, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
     TEST_f_L (llround, -0x1.fffffffffffffp+52, -9007199254740991LL, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
-#else
+#endif
+    TEST_f_L (llround, 0x1.fffffp-2, 0, ERRNO_UNCHANGED),
     /* nextafter(0.5,-1)  */
     TEST_f_L (llround, 0x1.fffffep-2, 0, ERRNO_UNCHANGED),
+    TEST_f_L (llround, -0x1.fffffp-2, 0, ERRNO_UNCHANGED),
     /* nextafter(-0.5,1)  */
     TEST_f_L (llround, -0x1.fffffep-2, 0, ERRNO_UNCHANGED),
+    TEST_f_L (llround, 0x1.fffffep+23, 16777215, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_L (llround, -0x1.fffffep+23, -16777215, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
     /* As above, on PowerPC an exponent of '23' is the largest incrementally
      * representable sequence of whole-numbers in the 'float' range.
      * Likewise, numbers between +-(2^23+1 and 2^24-1) are affected.  */
@@ -8215,8 +8365,6 @@ static const struct test_f_L_data llround_test_data[] =
     TEST_f_L (llround, -0x1.000002p+23,-8388609, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
     TEST_f_L (llround, 0x1.fffffep+23, 16777215, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
     TEST_f_L (llround, -0x1.fffffep+23, -16777215, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
-#endif
-
 
 #ifdef TEST_LDOUBLE
     /* The input can only be represented in long double.  */
diff --git a/sysdeps/ieee754/ldbl-96/s_lroundl.c b/sysdeps/ieee754/ldbl-96/s_lroundl.c
index e34edd3..7a59835 100644
--- a/sysdeps/ieee754/ldbl-96/s_lroundl.c
+++ b/sysdeps/ieee754/ldbl-96/s_lroundl.c
@@ -58,13 +58,15 @@ __lroundl (long double x)
       else
 	{
 	  u_int32_t j = i1 + (0x80000000 >> (j0 - 31));
+	  unsigned long int ures = i0;
+
 	  if (j < i1)
-	    ++i0;
+	    ++ures;
 
 	  if (j0 == 31)
-	    result = (long int) i0;
+	    result = ures;
 	  else
-	    result = ((long int) i0 << (j0 - 31)) | (j >> (63 - j0));
+	    result = (ures << (j0 - 31)) | (j >> (63 - j0));
 	}
     }
   else

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                           |   12 +++
 NEWS                                |    3 +-
 math/libm-test.inc                  |  170 ++++++++++++++++++++++++++++++++---
 sysdeps/ieee754/ldbl-96/s_lroundl.c |    8 +-
 4 files changed, 178 insertions(+), 15 deletions(-)


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