public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug c/103323] New: Front end simplifies sin although no header included
@ 2021-11-18 20:29 tkoenig at gcc dot gnu.org
2021-11-18 20:39 ` [Bug c/103323] " pinskia at gcc dot gnu.org
2021-11-18 21:20 ` tkoenig at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: tkoenig at gcc dot gnu.org @ 2021-11-18 20:29 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103323
Bug ID: 103323
Summary: Front end simplifies sin although no header included
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: tkoenig at gcc dot gnu.org
Target Milestone: ---
$ cat a.c
double
sin(double x) {
return x/2 + x;
}
double
foo(double x) {
return 1 - sin(-x);
}
$ gcc -S -fdump-tree-original a.c
$ cat a.c.005t.original
;; Function sin (null)
;; enabled by -tree-original
{
return x / 2.0e+0 + x;
}
;; Function foo (null)
;; enabled by -tree-original
{
return sin (x) + 1.0e+0;
}
$ gcc -v
Es werden eingebaute Spezifikationen verwendet.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/home/ig25/libexec/gcc/x86_64-pc-linux-gnu/12.0.0/lto-wrapper
Ziel: x86_64-pc-linux-gnu
Konfiguriert mit: ../trunk/configure --prefix=/home/ig25
--enable-languages=c,c++,fortran --enable-maintainer-mode
Thread-Modell: posix
Unterstützte LTO-Kompressionsalgorithmen: zlib
gcc-Version 12.0.0 20211116 (experimental) [master revision
e87559d202d:f4e6da6e8ac:36ec54aac7da134441c83248e14825381b8d6f17] (GCC)
The sin(x) in the tree dump should be sin(-x).
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c/103323] Front end simplifies sin although no header included
2021-11-18 20:29 [Bug c/103323] New: Front end simplifies sin although no header included tkoenig at gcc dot gnu.org
@ 2021-11-18 20:39 ` pinskia at gcc dot gnu.org
2021-11-18 21:20 ` tkoenig at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-11-18 20:39 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103323
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
sin is a reserved symbol in c, you need to use -fno-builtins if you don't want
the optimization.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c/103323] Front end simplifies sin although no header included
2021-11-18 20:29 [Bug c/103323] New: Front end simplifies sin although no header included tkoenig at gcc dot gnu.org
2021-11-18 20:39 ` [Bug c/103323] " pinskia at gcc dot gnu.org
@ 2021-11-18 21:20 ` tkoenig at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: tkoenig at gcc dot gnu.org @ 2021-11-18 21:20 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103323
Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=51437
--- Comment #2 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #1)
> sin is a reserved symbol in c, you need to use -fno-builtins if you don't
> want the optimization.
Ah, correct.
I also see that PR 51437 has the request for a warning.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2021-11-18 21:20 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-11-18 20:29 [Bug c/103323] New: Front end simplifies sin although no header included tkoenig at gcc dot gnu.org
2021-11-18 20:39 ` [Bug c/103323] " pinskia at gcc dot gnu.org
2021-11-18 21:20 ` tkoenig at gcc dot gnu.org
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).