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| author | Joseph Myers <joseph@codesourcery.com> | 2015-09-30 21:44:42 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2015-09-30 21:44:42 +0000 |
| commit | 8c6c9236361fbc077769673c259828216403bc33 (patch) | |
| tree | 04b02cf33c6654bc380d2c2ef986c41c4166d2ee /math | |
| parent | 93e448cbed1095c88133f2a304b1bbba72e480af (diff) | |
| download | glibc-8c6c9236361fbc077769673c259828216403bc33.zip glibc-8c6c9236361fbc077769673c259828216403bc33.tar.gz glibc-8c6c9236361fbc077769673c259828216403bc33.tar.bz2 | |
Fix i386 acosh (-qNaN) spurious "invalid" exception.
The i386 versions of acoshf and acosh raise a spurious "invalid"
exception for an argument that is a quiet NaN with the sign bit set.
The integer arithmetic to detect arguments < 1 also detects -NaN, and
then the computation 0 / 0 in that case raises the exception. This
patch fixes this by using (x - x) / (x - x) as the computation in that
case instead, which will always raise the exception for non-NaN
arguments reaching that code, but not for quiet NaN arguments.
Tested for x86_64 and x86.
[BZ #19032]
* sysdeps/i386/fpu/e_acosh.S (__ieee754_acosh): For arguments < 1,
compute result as (x - x) / (x - x) not as 0 / 0.
* sysdeps/i386/fpu/e_acoshf.S (__ieee754_acoshf): Likewise.
* math/libm-test.inc (acosh_test_data): Add another test of acosh.
Diffstat (limited to 'math')
| -rw-r--r-- | math/libm-test.inc | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/math/libm-test.inc b/math/libm-test.inc index 744c66d..8615957 100644 --- a/math/libm-test.inc +++ b/math/libm-test.inc @@ -1790,6 +1790,7 @@ static const struct test_f_f_data acosh_test_data[] = TEST_f_f (acosh, plus_infty, plus_infty, ERRNO_UNCHANGED), TEST_f_f (acosh, minus_infty, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM), TEST_f_f (acosh, qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), + TEST_f_f (acosh, -qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), /* x < 1: */ TEST_f_f (acosh, 0.75L, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM), |