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author | Joseph Myers <joseph@codesourcery.com> | 2016-09-28 21:11:58 +0000 |
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committer | Joseph Myers <joseph@codesourcery.com> | 2016-09-28 21:11:58 +0000 |
commit | b59ad2db99df74326ae28926299469eecce6f468 (patch) | |
tree | c18cd839284e4ce4ca1b9edc06a4f61032c077f4 /ChangeLog | |
parent | e83be730910c341f2f02ccc207b0586bb04fc21a (diff) | |
download | glibc-b59ad2db99df74326ae28926299469eecce6f468.tar.gz glibc-b59ad2db99df74326ae28926299469eecce6f468.tar.xz glibc-b59ad2db99df74326ae28926299469eecce6f468.zip |
Fix iszero for excess precision.
Floating-point classification macros are supposed to remove any excess range or precision from their arguments. This patch fixes the non-sNaN version of iszero to do so, by casting the argument to its own type. (This will of course work only for standard-conforming excess precision, not for what GCC does on 32-bit x86 by default where the back end hides excess precision from the front end; the same applies to most of the classification macros in that case, as showed up when we made them use GCC built-in functions.) (iseqsig will have the reverse issue, needing to ensure that when an underlying function is used it's for a type wide enough not to remove any excess precision, since comparison macros must not remove excess precision.) Tested for x86_64 and x86. * math/math.h [__GLIBC_USE (IEC_60559_BFP_EXT) && !__SUPPORT_SNAN__] (iszero): Cast argument to its own type. * math/test-iszero-excess-precision.c: New file. * math/Makefile (tests): Add test-iszero-excess-precision. (CFLAGS-test-iszero-excess-precision.c): New variable.
Diffstat (limited to 'ChangeLog')
-rw-r--r-- | ChangeLog | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index 6d6e668345..1f9538c429 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,12 @@ +2016-09-28 Joseph Myers <joseph@codesourcery.com> + + * math/math.h + [__GLIBC_USE (IEC_60559_BFP_EXT) && !__SUPPORT_SNAN__] (iszero): + Cast argument to its own type. + * math/test-iszero-excess-precision.c: New file. + * math/Makefile (tests): Add test-iszero-excess-precision. + (CFLAGS-test-iszero-excess-precision.c): New variable. + 2016-09-28 Rasmus Villemoes <rv@rasmusvillemoes.dk> * sysdeps/unix/sysv/linux/spawni.c (posix_spawn_args): Remove pipe |