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Fix ldbl-96 remquol (finite, Inf) (bug 18244).

Browse Source 
ldbl-96 remquol wrongly handles the case where the first argument is
finite and the second infinite, because the check for the second
argument being a NaN fails to disregard the explicit high mantissa bit
and so wrongly interprets an infinity as being a NaN.  This patch
fixes this by masking off that bit, and improves test coverage for
both remainder and remquo (various cases were missing tests, or, as in
the case of the bug, were tested only for one of the two functions).

Tested for x86_64 and x86.

	[BZ #18244]
	* sysdeps/ieee754/ldbl-96/s_remquol.c (__remquol): Ignore explicit
	high mantissa bit when testing whether P is a NaN.
	* math/libm-test.inc (remainder_test_data): Add more tests.
	(remquo_test_data): Likewise.
This commit is contained in:
Joseph Myers 2015-05-19 23:44:28 +00:00
parent 526af54142
commit 3ce2232efb
4 changed files with 46 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
ChangeLog
View File

@ -1,5 +1,11 @@
2015-05-19 Joseph Myers <joseph@codesourcery.com>
[BZ #18244]
* sysdeps/ieee754/ldbl-96/s_remquol.c (__remquol): Ignore explicit
high mantissa bit when testing whether P is a NaN.
* math/libm-test.inc (remainder_test_data): Add more tests.
(remquo_test_data): Likewise.
[BZ #18049]
* sysdeps/i386/fpu/e_atanhl.S (__ieee754_atanhl): For exponents
below -32, return the argument, with underflow if subnormal.

4
NEWS
View File

@ -17,8 +17,8 @@ Version 2.22
17991, 17996, 17998, 17999, 18007, 18019, 18020, 18029, 18030, 18032,
18036, 18038, 18039, 18042, 18043, 18046, 18047, 18049, 18068, 18080,
18093, 18100, 18104, 18110, 18111, 18125, 18128, 18138, 18185, 18196,
18197, 18206, 18210, 18211, 18217, 18220, 18221, 18247, 18287, 18319,
18333, 18346, 18397, 18409, 18418.
18197, 18206, 18210, 18211, 18217, 18220, 18221, 18244, 18247, 18287,
18319, 18333, 18346, 18397, 18409, 18418.
* Cache information can be queried via sysconf() function on s390 e.g. with
_SC_LEVEL1_ICACHE_SIZE as argument.

37
math/libm-test.inc
View File

@ -8719,17 +8719,31 @@ static const struct test_ff_f_data remainder_test_data[] =
{
TEST_ff_f (remainder, 1, 0, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION|ERRNO_EDOM),
TEST_ff_f (remainder, 1, minus_zero, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION|ERRNO_EDOM),
TEST_ff_f (remainder, plus_zero, plus_zero, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION|ERRNO_EDOM),
TEST_ff_f (remainder, plus_zero, minus_zero, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION|ERRNO_EDOM),
TEST_ff_f (remainder, minus_zero, plus_zero, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION|ERRNO_EDOM),
TEST_ff_f (remainder, minus_zero, minus_zero, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION|ERRNO_EDOM),
TEST_ff_f (remainder, plus_infty, minus_zero, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION|ERRNO_EDOM),
TEST_ff_f (remainder, plus_infty, 0, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION|ERRNO_EDOM),
TEST_ff_f (remainder, plus_infty, 1, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION|ERRNO_EDOM),
TEST_ff_f (remainder, plus_infty, 2, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION|ERRNO_EDOM),
TEST_ff_f (remainder, plus_infty, plus_infty, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION|ERRNO_EDOM),
TEST_ff_f (remainder, plus_infty, minus_infty, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION|ERRNO_EDOM),
TEST_ff_f (remainder, minus_infty, minus_zero, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION|ERRNO_EDOM),
TEST_ff_f (remainder, minus_infty, 0, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION|ERRNO_EDOM),
TEST_ff_f (remainder, minus_infty, 1, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION|ERRNO_EDOM),
TEST_ff_f (remainder, minus_infty, 2, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION|ERRNO_EDOM),
TEST_ff_f (remainder, minus_infty, plus_infty, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION|ERRNO_EDOM),
TEST_ff_f (remainder, minus_infty, minus_infty, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION|ERRNO_EDOM),
TEST_ff_f (remainder, qnan_value, qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (remainder, 0, qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (remainder, qnan_value, 0, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (remainder, 1, qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (remainder, qnan_value, 1, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (remainder, plus_infty, qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (remainder, qnan_value, plus_infty, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (remainder, minus_infty, qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (remainder, qnan_value, minus_infty, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (remainder, 7.0, plus_infty, 7.0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (remainder, 7.0, minus_infty, 7.0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
@ -8763,9 +8777,32 @@ static const struct test_ffI_f1_data remquo_test_data[] =
{
TEST_ffI_f1 (remquo, 1, 0, qnan_value, IGNORE, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
TEST_ffI_f1 (remquo, 1, minus_zero, qnan_value, IGNORE, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
TEST_ffI_f1 (remquo, plus_zero, plus_zero, qnan_value, IGNORE, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
TEST_ffI_f1 (remquo, plus_zero, minus_zero, qnan_value, IGNORE, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
TEST_ffI_f1 (remquo, minus_zero, plus_zero, qnan_value, IGNORE, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
TEST_ffI_f1 (remquo, minus_zero, minus_zero, qnan_value, IGNORE, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
TEST_ffI_f1 (remquo, plus_infty, minus_zero, qnan_value, IGNORE, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
TEST_ffI_f1 (remquo, plus_infty, 0, qnan_value, IGNORE, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
TEST_ffI_f1 (remquo, plus_infty, 1, qnan_value, IGNORE, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
TEST_ffI_f1 (remquo, plus_infty, plus_infty, qnan_value, IGNORE, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
TEST_ffI_f1 (remquo, plus_infty, minus_infty, qnan_value, IGNORE, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
TEST_ffI_f1 (remquo, minus_infty, minus_zero, qnan_value, IGNORE, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
TEST_ffI_f1 (remquo, minus_infty, 0, qnan_value, IGNORE, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
TEST_ffI_f1 (remquo, minus_infty, 1, qnan_value, IGNORE, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
TEST_ffI_f1 (remquo, minus_infty, plus_infty, qnan_value, IGNORE, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
TEST_ffI_f1 (remquo, minus_infty, minus_infty, qnan_value, IGNORE, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
TEST_ffI_f1 (remquo, qnan_value, qnan_value, qnan_value, IGNORE, NO_INEXACT_EXCEPTION),
TEST_ffI_f1 (remquo, 0, qnan_value, qnan_value, IGNORE, NO_INEXACT_EXCEPTION),
TEST_ffI_f1 (remquo, qnan_value, 0, qnan_value, IGNORE, NO_INEXACT_EXCEPTION),
TEST_ffI_f1 (remquo, 1, qnan_value, qnan_value, IGNORE, NO_INEXACT_EXCEPTION),
TEST_ffI_f1 (remquo, qnan_value, 1, qnan_value, IGNORE, NO_INEXACT_EXCEPTION),
TEST_ffI_f1 (remquo, plus_infty, qnan_value, qnan_value, IGNORE, NO_INEXACT_EXCEPTION),
TEST_ffI_f1 (remquo, qnan_value, plus_infty, qnan_value, IGNORE, NO_INEXACT_EXCEPTION),
TEST_ffI_f1 (remquo, minus_infty, qnan_value, qnan_value, IGNORE, NO_INEXACT_EXCEPTION),
TEST_ffI_f1 (remquo, qnan_value, minus_infty, qnan_value, IGNORE, NO_INEXACT_EXCEPTION),
TEST_ffI_f1 (remquo, 7.0, plus_infty, 7.0, 0, NO_INEXACT_EXCEPTION),
TEST_ffI_f1 (remquo, 7.0, minus_infty, 7.0, 0, NO_INEXACT_EXCEPTION),
TEST_ffI_f1 (remquo, 1.625, 1.0, -0.375, 2, NO_INEXACT_EXCEPTION),
TEST_ffI_f1 (remquo, -1.625, 1.0, 0.375, -2, NO_INEXACT_EXCEPTION),

2
sysdeps/ieee754/ldbl-96/s_remquol.c
View File

@ -44,7 +44,7 @@ __remquol (long double x, long double p, int *quo)
return (x * p) / (x * p); /* p = 0 */
if ((ex == 0x7fff) /* x not finite */
|| ((ep == 0x7fff) /* p is NaN */
&& ((hp | lp) != 0)))
&& (((hp & 0x7fffffff) | lp) != 0)))
return (x * p) / (x * p);
if (ep <= 0x7ffb)