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| author | Joseph Myers <joseph@codesourcery.com> | 2012-05-25 11:07:07 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2012-05-25 11:07:07 +0000 |
| commit | b65504975c97e1ec7aadaa75dcefb42e7e70fa1f (patch) | |
| tree | d50f67531259ec2ffa0180541613808b60d1c7d9 | |
| parent | b0bc23a1777005ddcd54ec434f0deec88d3468fc (diff) | |
| download | glibc-b65504975c97e1ec7aadaa75dcefb42e7e70fa1f.tar.gz glibc-b65504975c97e1ec7aadaa75dcefb42e7e70fa1f.tar.xz glibc-b65504975c97e1ec7aadaa75dcefb42e7e70fa1f.zip | |
Fix acosf underflow (bug 14153).
| -rw-r--r-- | ChangeLog | 8 | ||||
| -rw-r--r-- | NEWS | 2 | ||||
| -rw-r--r-- | math/libm-test.inc | 3 | ||||
| -rw-r--r-- | sysdeps/ieee754/flt-32/e_acosf.c | 2 |
4 files changed, 11 insertions, 4 deletions
diff --git a/ChangeLog b/ChangeLog index c6c2cad725..ceb3f5af77 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,11 @@ +2012-05-24 Joseph Myers <joseph@codesourcery.com> + + [BZ #14153] + * sysdeps/ieee754/flt-32/e_acosf.c (__ieee754_acosf): Return pi/2 + for |x| <= 2**-26, not 2**-57. + * math/libm-test.inc (acos_test): Do not allow spurious underflow + exception. + 2012-05-24 Jeff Law <law@redhat.com> * stdio-common/Makefile (tests): Add bug25. diff --git a/NEWS b/NEWS index 7ccfb903ef..932934dbc8 100644 --- a/NEWS +++ b/NEWS @@ -28,7 +28,7 @@ Version 2.16 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970, 13973, 13979, 13983, 13986, 14012, 14027, 14033, 14034, 14036, 14040, 14043, 14044, 14049, 14053, 14055, 14059, 14064, 14080, 14083, 14103, 14104, - 14109, 14122, 14123 + 14109, 14122, 14123, 14153 * ISO C11 support: diff --git a/math/libm-test.inc b/math/libm-test.inc index 5946ca890b..ed13f53ec8 100644 --- a/math/libm-test.inc +++ b/math/libm-test.inc @@ -804,8 +804,7 @@ acos_test (void) TEST_f_f (acos, 0.5, M_PI_6l*2.0); TEST_f_f (acos, -0.5, M_PI_6l*4.0); TEST_f_f (acos, 0.75L, 0.722734247813415611178377352641333362L); - /* Bug 14153: spurious exception may occur. */ - TEST_f_f (acos, 2e-17L, 1.57079632679489659923132169163975144L, UNDERFLOW_EXCEPTION_OK_FLOAT); + TEST_f_f (acos, 2e-17L, 1.57079632679489659923132169163975144L); TEST_f_f (acos, 0.0625L, 1.50825556499840522843072005474337068L); TEST_f_f (acos, 0x0.ffffffp0L, 3.4526698471620358760324948263873649728491e-4L); TEST_f_f (acos, -0x0.ffffffp0L, 3.1412473866050770348750401337968641476999L); diff --git a/sysdeps/ieee754/flt-32/e_acosf.c b/sysdeps/ieee754/flt-32/e_acosf.c index c0f1d4ea74..6f792f6604 100644 --- a/sysdeps/ieee754/flt-32/e_acosf.c +++ b/sysdeps/ieee754/flt-32/e_acosf.c @@ -46,7 +46,7 @@ __ieee754_acosf(float x) return (x-x)/(x-x); /* acos(|x|>1) is NaN */ } if(ix<0x3f000000) { /* |x| < 0.5 */ - if(ix<=0x23000000) return pio2_hi+pio2_lo;/*if|x|<2**-57*/ + if(ix<=0x32800000) return pio2_hi+pio2_lo;/*if|x|<=2**-26*/ z = x*x; p = z*(pS0+z*(pS1+z*(pS2+z*(pS3+z*(pS4+z*pS5))))); q = one+z*(qS1+z*(qS2+z*(qS3+z*qS4))); |