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| author | Joseph Myers <joseph@codesourcery.com> | 2012-11-22 14:57:22 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2012-11-22 14:57:22 +0000 |
| commit | 8e27e3cc453849158e069dbed0eea7b8113ab8ff (patch) | |
| tree | 4f4b8ecd14b90dc0f283fdc002d2cbef94cba7e2 | |
| parent | c9c0279bcb2bd0871e9a4affbab3244389de1353 (diff) | |
| download | glibc-8e27e3cc453849158e069dbed0eea7b8113ab8ff.tar.gz glibc-8e27e3cc453849158e069dbed0eea7b8113ab8ff.tar.xz glibc-8e27e3cc453849158e069dbed0eea7b8113ab8ff.zip | |
Fix ldbl-128ibm hypotl inaccuracy for arguments with large ratio (bug 14868).
| -rw-r--r-- | ChangeLog | 5 | ||||
| -rw-r--r-- | NEWS | 2 | ||||
| -rw-r--r-- | math/libm-test.inc | 2 | ||||
| -rw-r--r-- | sysdeps/ieee754/ldbl-128ibm/e_hypotl.c | 2 |
4 files changed, 9 insertions, 2 deletions
diff --git a/ChangeLog b/ChangeLog index c2421fa10d..69dd8fe2d8 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,5 +1,10 @@ 2012-11-22 Joseph Myers <joseph@codesourcery.com> + [BZ #14868] + * sysdeps/ieee754/ldbl-128ibm/e_hypotl.c (__ieee754_hypotl): + Return a+b for ratio over 2**120, not 2**60. + * math/libm-test.inc (hypot_test): Add another test. + * math/libm-test.inc (clog_test): Use UNDERFLOW_EXCEPTION_LDOUBLE_IBM on two tests. (clog10_test): Likewise. diff --git a/NEWS b/NEWS index c17a5573f0..94e1260137 100644 --- a/NEWS +++ b/NEWS @@ -21,7 +21,7 @@ Version 2.17 14638, 14645, 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719, 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14805, 14807, 14809, 14811, 14815, 14821, 14822, 14824, 14828, - 14831, 14835, 14838, 14856, 14863, 14865, 14866. + 14831, 14835, 14838, 14856, 14863, 14865, 14866, 14868. * Port to ARM AArch64 contributed by Linaro. diff --git a/math/libm-test.inc b/math/libm-test.inc index 74ef15b212..21f46469de 100644 --- a/math/libm-test.inc +++ b/math/libm-test.inc @@ -5730,6 +5730,8 @@ hypot_test (void) TEST_ff_f (hypot, 0.75L, 1.25L, 1.45773797371132511771853821938639577L); + TEST_ff_f (hypot, 1.0L, 0x1p-61L, 1.0L); + #if !(defined TEST_FLOAT && defined TEST_INLINE) TEST_ff_f (hypot, 0x3p125L, 0x4p125L, 0x5p125L); TEST_ff_f (hypot, 0x1.234566p-126L, 0x1.234566p-126L, 1.891441686191081936598531534017449451173e-38L); diff --git a/sysdeps/ieee754/ldbl-128ibm/e_hypotl.c b/sysdeps/ieee754/ldbl-128ibm/e_hypotl.c index 00bfb15926..ce21194cd5 100644 --- a/sysdeps/ieee754/ldbl-128ibm/e_hypotl.c +++ b/sysdeps/ieee754/ldbl-128ibm/e_hypotl.c @@ -61,7 +61,7 @@ __ieee754_hypotl(long double x, long double y) if(hb > ha) {a=y;b=x;j=ha; ha=hb;hb=j;} else {a=x;b=y;} a = fabsl(a); /* a <- |a| */ b = fabsl(b); /* b <- |b| */ - if((ha-hb)>0x3c0000000000000LL) {return a+b;} /* x/y > 2**60 */ + if((ha-hb)>0x780000000000000LL) {return a+b;} /* x/y > 2**120 */ k=0; kld = 1.0L; if(ha > 0x5f30000000000000LL) { /* a>2**500 */ |