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Dimitry Andric 3b00222f15 Avoid raising unexpected floating point exceptions in libm
When using clang with x86_64 CPUs that support AVX, some floating point
transformations may raise exceptions that would not have been raised by
the original code. To avoid this, use the -fp-exception-behavior=maytrap
flag, introduced in clang 10.0.0.

In particular, this fixes a number of test failures with ctanhf(3) and
ctanf(3), when libm is compiled with -mavx. An unexpected FE_INVALID
exception is then raised, because clang emits vdivps instructions to
perform certain divides. (The vdivps instruction operates on multiple
single-precision float operands simultaneously, but the exceptions may
be influenced by unused parts of the XMM registers. In this particular
case, it was calculating 0 / 0, which results in FE_INVALID.)

If -fp-exception-behavior=maytrap is specified however, clang uses
vdivss instructions instead, which work on one operand, and should not
raise unexpected exceptions.

Reported by:	olivier
Reviewed by:	arichardson
PR:		254911
MFC after:	1 week
Differential Revision: https://reviews.freebsd.org/D29686
2021-04-10 13:59:57 +02:00
.github/workflows GitHub actions: unbreak macOS build 2021-01-08 15:36:38 +01:00
bin ed(1): Add two references in the SEE ALSO section 2021-04-09 09:43:49 +02:00
cddl dtrace: Document the libdir, nolibs and syslibdir options 2021-04-02 17:42:38 -04:00
contrib libpfctl: Switch to pfctl_rule 2021-04-10 11:16:02 +02:00
crypto OpenSSL: Merge OpenSSL 1.1.1k 2021-03-25 11:45:19 -04:00
etc base: remove if_wg(4) and associated utilities, manpage 2021-03-17 09:14:48 -05:00
gnu dialog: fix macro redefinition 2021-03-01 16:01:44 +01:00
include Import OpenSSL 1.1.1k. 2021-03-25 11:05:31 -04:00
kerberos5 kerberos5: fix the WITH_OPENLDAP build 2021-01-30 00:07:50 -06:00
lib Avoid raising unexpected floating point exceptions in libm 2021-04-10 13:59:57 +02:00
libexec (t)ftp-proxy: use libpfctl 2021-04-10 11:16:02 +02:00
release release: move installworld before installkernel 2021-04-05 13:16:01 -04:00
rescue ping: add a ping6 hard link for backwards compatibility 2020-11-26 18:33:04 +00:00
sbin libpfctl: Fix u_* counters 2021-04-10 11:16:03 +02:00
secure OpenSSL: Regen manual pages for 1.1.1k 2021-03-25 12:17:52 -04:00
share pfctl: Move ioctl abstraction functions into libpfctl 2021-04-10 11:16:02 +02:00
stand Loader: support booting OS from memory disk (MD) 2021-04-07 13:40:57 -05:00
sys pf: Move prototypes for userspace functions to userspace header 2021-04-10 11:16:02 +02:00
targets Remove kgmon(8) 2021-04-04 00:50:28 +03:00
tests shared shadow vm object invalidation regression test 2021-04-07 12:39:05 -07:00
tools Drop 'Set to' from most src.conf(5) knobs 2021-04-09 22:23:03 -04:00
usr.bin m4(1): Add a SEE ALSO section and reference an AT&T manual 2021-04-08 21:16:54 +02:00
usr.sbin libpfctl: Switch to pfctl_rule 2021-04-10 11:16:02 +02:00
.arcconfig Adjust .arcconfig to land onto 'main' by default 2021-04-10 13:51:16 +02:00
.arclint arc lint: ignore /tests/ in chmod 2017-12-19 03:38:06 +00:00
.cirrus.yml Cirrus-CI: Add more information to help track down disk full issues 2021-03-03 11:51:08 -05:00
.clang-format clang-format: Avoid breaking after the opening paren of function definitions 2020-10-28 11:54:00 +00:00
.gitattributes Add a basic clang-format configuration file 2019-06-07 15:23:52 +00:00
.gitignore gitignore: expand list of ignored files 2021-01-14 17:03:57 +01:00
COPYRIGHT copyrights: Happy New Year 2021 2020-12-31 10:29:44 -05:00
LOCKS LOCKS: update current locks 2018-06-09 03:08:04 +00:00
MAINTAINERS Add a pointer to csprng@ for the CSPRNG driver. This is enforced anyway by 2020-09-01 08:02:12 +00:00
Makefile Fix 'make bmake' top-level bootstrapping. 2021-03-06 09:45:08 -08:00
Makefile.inc1 Makefile.inc1: unbreak bootstrap when kbdcontrol does not exist 2021-03-23 20:47:14 -04:00
Makefile.libcompat libcompat: remove redundant path for ncurses 2021-01-07 15:14:52 +01:00
Makefile.sys.inc
ObsoleteFiles.inc Remove tcp_hostcache.h. Everything is private. 2021-04-08 10:58:44 -07:00
README.md Whitespace cleanup 2021-03-12 19:57:58 +08:00
RELNOTES Bump CURRENT to 14.0 2021-01-21 19:10:07 -05:00
UPDATING UPDATING: dereference portupgrade(8) 2021-04-08 20:26:41 -04:00

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