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Fix dbl-64 acos (sNaN) (bug 20212).

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The dbl-64 version of acos returns sNaN for sNaN arguments.  This
patch fixes it to add NaN arguments to themselves so that qNaN is
returned in this case.

Tested for x86_64 and x86.

	[BZ #20212]
	* sysdeps/ieee754/dbl-64/e_asin.c (__ieee754_acos): Add NaN
	argument to itself.
	* math/libm-test.inc (acos_test_data): Add sNaN tests.
This commit is contained in:
Joseph Myers 2016-06-06 22:10:11 +00:00
parent c24480ce3b
commit af0cfbaf1d
3 changed files with 10 additions and 1 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2016-06-06 Joseph Myers <joseph@codesourcery.com>
[BZ #20212]
* sysdeps/ieee754/dbl-64/e_asin.c (__ieee754_acos): Add NaN
argument to itself.
* math/libm-test.inc (acos_test_data): Add sNaN tests.
2016-06-06 Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>
* sysdeps/powerpc/powerpc64/power8/strcasestr.S (__strcasestr):

2
math/libm-test.inc
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@ -1799,6 +1799,8 @@ static const struct test_f_f_data acos_test_data[] =
TEST_f_f (acos, minus_infty, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_f_f (acos, qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_f_f (acos, -qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_f_f (acos, snan_value, qnan_value, INVALID_EXCEPTION),
TEST_f_f (acos, -snan_value, qnan_value, INVALID_EXCEPTION),
/* |x| > 1: */
TEST_f_f (acos, 1.125L, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),

2
sysdeps/ieee754/dbl-64/e_asin.c
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@ -633,7 +633,7 @@ __ieee754_acos(double x)
else
if (k==0x3ff00000 && u.i[LOW_HALF]==0) return (m>0)?0:2.0*hp0.x;
else
if (k>0x7ff00000 || (k == 0x7ff00000 && u.i[LOW_HALF] != 0)) return x;
if (k>0x7ff00000 || (k == 0x7ff00000 && u.i[LOW_HALF] != 0)) return x + x;
else {
u.i[HIGH_HALF]=0x7ff00000;
v.i[HIGH_HALF]=0x7ff00000;