diff options
| author | Joseph Myers <joseph@codesourcery.com> | 2016-12-14 22:41:26 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2016-12-14 22:41:26 +0000 |
| commit | f02bb0004c5b1944333fd8e74ac1efda3074084b (patch) | |
| tree | 8d8a014f21c16954053431f52588ef8267a5753b /ChangeLog | |
| parent | 0acb8a2a855395c25b1feef2470f4d7ca4bed589 (diff) | |
| download | glibc-f02bb0004c5b1944333fd8e74ac1efda3074084b.tar.gz glibc-f02bb0004c5b1944333fd8e74ac1efda3074084b.tar.xz glibc-f02bb0004c5b1944333fd8e74ac1efda3074084b.zip | |
Fix generic fmax, fmin sNaN handling (bug 20947).
Various fmax and fmin function implementations mishandle sNaN arguments: (a) When both arguments are NaNs, the return value should be a qNaN, but sometimes it is an sNaN if at least one argument is an sNaN. (b) Under TS 18661-1 semantics, if either argument is an sNaN then the result should be a qNaN (whereas if one argument is a qNaN and the other is not a NaN, the result should be the non-NaN argument). Various implementations treat sNaNs like qNaNs here. This patch fixes the generic implementations used in the absence of architecture-specific versions. Tested for mips64 and powerpc (together with testcases that I'll add along with the x86_64 / x86 fixes). [BZ #20947] * math/s_fmax_template.c (M_DECL_FUNC (__fmax)): Add the arguments when either is a signaling NaN. * math/s_fmin_template.c (M_DECL_FUNC (__fmin)): Likewise.
Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index ba42b5bd28..c08b711d7a 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,5 +1,10 @@ 2016-12-14 Joseph Myers <joseph@codesourcery.com> + [BZ #20947] + * math/s_fmax_template.c (M_DECL_FUNC (__fmax)): Add the arguments + when either is a signaling NaN. + * math/s_fmin_template.c (M_DECL_FUNC (__fmin)): Likewise. + * bits/long-double.h: New file. * sysdeps/ieee754/ldbl-128/bits/long-double.h: Likewise. * sysdeps/ieee754/ldbl-96/bits/long-double.h: Likewise. |