diff options
| author | Joseph Myers <joseph@codesourcery.com> | 2016-06-06 22:10:11 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2016-06-06 22:10:11 +0000 |
| commit | af0cfbaf1df1549ca0bc70bd6b4bc54004d11680 (patch) | |
| tree | 098497c0884048b37effc5a287a1a5786c5dd752 | |
| parent | c24480ce3b5fed848243fc9642932ef2fa670109 (diff) | |
| download | glibc-af0cfbaf1df1549ca0bc70bd6b4bc54004d11680.zip glibc-af0cfbaf1df1549ca0bc70bd6b4bc54004d11680.tar.gz glibc-af0cfbaf1df1549ca0bc70bd6b4bc54004d11680.tar.bz2 | |
Fix dbl-64 acos (sNaN) (bug 20212).
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.
| -rw-r--r-- | ChangeLog | 7 | ||||
| -rw-r--r-- | math/libm-test.inc | 2 | ||||
| -rw-r--r-- | sysdeps/ieee754/dbl-64/e_asin.c | 2 |
3 files changed, 10 insertions, 1 deletions
@@ -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): diff --git a/math/libm-test.inc b/math/libm-test.inc index aaa0148..6981720 100644 --- a/math/libm-test.inc +++ b/math/libm-test.inc @@ -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), diff --git a/sysdeps/ieee754/dbl-64/e_asin.c b/sysdeps/ieee754/dbl-64/e_asin.c index d8c012d..5d5fb01 100644 --- a/sysdeps/ieee754/dbl-64/e_asin.c +++ b/sysdeps/ieee754/dbl-64/e_asin.c @@ -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; |