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* [Bug fortran/39314] New: -ffpe-trap=invalid gives no FPE for acos(-5.0)
@ 2009-02-26 15:28 janus at gcc dot gnu dot org
2009-02-26 15:35 ` [Bug fortran/39314] " kargl at gcc dot gnu dot org
` (11 more replies)
0 siblings, 12 replies; 13+ messages in thread
From: janus at gcc dot gnu dot org @ 2009-02-26 15:28 UTC (permalink / raw)
To: gcc-bugs
The following produces an FPE when compiled with -ffpe-trap=invalid:
real :: x = 1.0
print *, sqrt(-1.0*x)
However, using acos or asin does not:
real :: x = 1.0
print *, acos(5.0*x)
print *, asin(5.0*x)
Instead it just prints out "NaN". The FPE is missing both in 4.3 and on trunk.
--
Summary: -ffpe-trap=invalid gives no FPE for acos(-5.0)
Product: gcc
Version: 4.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: janus at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39314
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug fortran/39314] -ffpe-trap=invalid gives no FPE for acos(-5.0)
2009-02-26 15:28 [Bug fortran/39314] New: -ffpe-trap=invalid gives no FPE for acos(-5.0) janus at gcc dot gnu dot org
@ 2009-02-26 15:35 ` kargl at gcc dot gnu dot org
2009-02-26 15:45 ` janus at gcc dot gnu dot org
` (10 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: kargl at gcc dot gnu dot org @ 2009-02-26 15:35 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from kargl at gcc dot gnu dot org 2009-02-26 15:35 -------
What target?
Works for me on FreeBSD.
laptop:kargl[23] ~/work/bin/gfortran -static -o z -ffpe-trap=invalid j.f90
laptop:kargl[24] ./z
Floating exception (core dumped)
laptop:kargl[25] cat j.f90
real :: x = 1.0
print *, acos(5.0*x)
print *, asin(5.0*x)
end
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39314
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug fortran/39314] -ffpe-trap=invalid gives no FPE for acos(-5.0)
2009-02-26 15:28 [Bug fortran/39314] New: -ffpe-trap=invalid gives no FPE for acos(-5.0) janus at gcc dot gnu dot org
2009-02-26 15:35 ` [Bug fortran/39314] " kargl at gcc dot gnu dot org
@ 2009-02-26 15:45 ` janus at gcc dot gnu dot org
2009-02-26 18:04 ` burnus at gcc dot gnu dot org
` (9 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: janus at gcc dot gnu dot org @ 2009-02-26 15:45 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from janus at gcc dot gnu dot org 2009-02-26 15:45 -------
Sorry, forgot to specify the target: x86_64-unknown-linux-gnu.
--
janus at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
GCC target triplet| |x86_64-unknown-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39314
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug fortran/39314] -ffpe-trap=invalid gives no FPE for acos(-5.0)
2009-02-26 15:28 [Bug fortran/39314] New: -ffpe-trap=invalid gives no FPE for acos(-5.0) janus at gcc dot gnu dot org
2009-02-26 15:35 ` [Bug fortran/39314] " kargl at gcc dot gnu dot org
2009-02-26 15:45 ` janus at gcc dot gnu dot org
@ 2009-02-26 18:04 ` burnus at gcc dot gnu dot org
2009-02-26 18:05 ` pinskia at gcc dot gnu dot org
` (8 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: burnus at gcc dot gnu dot org @ 2009-02-26 18:04 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from burnus at gcc dot gnu dot org 2009-02-26 18:03 -------
Confirm: Here, I get the same result with -m64 on Linux (NaN and no SIGFPE),
but with -m32 (with both -mfpmath=sse and -mfpmath=387) I get the SIGFPE.
The FPE settings are used in libgfortran/config/*; maybe fpu-387.h does
something wrong in the x86-64 mode?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39314
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug fortran/39314] -ffpe-trap=invalid gives no FPE for acos(-5.0)
2009-02-26 15:28 [Bug fortran/39314] New: -ffpe-trap=invalid gives no FPE for acos(-5.0) janus at gcc dot gnu dot org
` (2 preceding siblings ...)
2009-02-26 18:04 ` burnus at gcc dot gnu dot org
@ 2009-02-26 18:05 ` pinskia at gcc dot gnu dot org
2009-02-26 19:22 ` janus at gcc dot gnu dot org
` (7 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2009-02-26 18:05 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from pinskia at gcc dot gnu dot org 2009-02-26 18:05 -------
Or maybe libc's acos is broken .... In which case this is not a GCC bug.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39314
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug fortran/39314] -ffpe-trap=invalid gives no FPE for acos(-5.0)
2009-02-26 15:28 [Bug fortran/39314] New: -ffpe-trap=invalid gives no FPE for acos(-5.0) janus at gcc dot gnu dot org
` (3 preceding siblings ...)
2009-02-26 18:05 ` pinskia at gcc dot gnu dot org
@ 2009-02-26 19:22 ` janus at gcc dot gnu dot org
2009-02-27 9:02 ` janus at gcc dot gnu dot org
` (6 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: janus at gcc dot gnu dot org @ 2009-02-26 19:22 UTC (permalink / raw)
To: gcc-bugs
------- Comment #5 from janus at gcc dot gnu dot org 2009-02-26 19:22 -------
Also on i386-apple-darwin9.6.0 the FPEs are thrown correctly.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39314
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug fortran/39314] -ffpe-trap=invalid gives no FPE for acos(-5.0)
2009-02-26 15:28 [Bug fortran/39314] New: -ffpe-trap=invalid gives no FPE for acos(-5.0) janus at gcc dot gnu dot org
` (4 preceding siblings ...)
2009-02-26 19:22 ` janus at gcc dot gnu dot org
@ 2009-02-27 9:02 ` janus at gcc dot gnu dot org
2009-02-27 9:13 ` janus at gcc dot gnu dot org
` (5 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: janus at gcc dot gnu dot org @ 2009-02-27 9:02 UTC (permalink / raw)
To: gcc-bugs
------- Comment #6 from janus at gcc dot gnu dot org 2009-02-27 09:01 -------
On x86_64-unknown-linux-gnu I *do* get the ICE when I compile with -ffast-math
-mfpmath=387. Cf. http://gcc.gnu.org/ml/fortran/2008-11/msg00250.html.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39314
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug fortran/39314] -ffpe-trap=invalid gives no FPE for acos(-5.0)
2009-02-26 15:28 [Bug fortran/39314] New: -ffpe-trap=invalid gives no FPE for acos(-5.0) janus at gcc dot gnu dot org
` (5 preceding siblings ...)
2009-02-27 9:02 ` janus at gcc dot gnu dot org
@ 2009-02-27 9:13 ` janus at gcc dot gnu dot org
2009-02-27 10:49 ` burnus at gcc dot gnu dot org
` (4 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: janus at gcc dot gnu dot org @ 2009-02-27 9:13 UTC (permalink / raw)
To: gcc-bugs
------- Comment #7 from janus at gcc dot gnu dot org 2009-02-27 09:13 -------
Note that the problem also appears for log, while it does not for acosh and
atanh:
real :: x = -5.0
! FPE is not thrown
print *, log(x)
print *, log10(x)
print *, acos(x)
print *, asin(x)
! FPE is thrown
!print *, sqrt(x)
!print *, atanh(x)
!print *, acosh(x)
end
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39314
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug fortran/39314] -ffpe-trap=invalid gives no FPE for acos(-5.0)
2009-02-26 15:28 [Bug fortran/39314] New: -ffpe-trap=invalid gives no FPE for acos(-5.0) janus at gcc dot gnu dot org
` (6 preceding siblings ...)
2009-02-27 9:13 ` janus at gcc dot gnu dot org
@ 2009-02-27 10:49 ` burnus at gcc dot gnu dot org
2009-02-27 13:15 ` janus at gcc dot gnu dot org
` (3 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: burnus at gcc dot gnu dot org @ 2009-02-27 10:49 UTC (permalink / raw)
To: gcc-bugs
------- Comment #8 from burnus at gcc dot gnu dot org 2009-02-27 10:49 -------
> Note that the problem also appears for log, while it does not for acosh and
> atanh:
If it works with some but not all libm routines, it sounds more like a GLIBC
than like a GCC problem.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39314
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug fortran/39314] -ffpe-trap=invalid gives no FPE for acos(-5.0)
2009-02-26 15:28 [Bug fortran/39314] New: -ffpe-trap=invalid gives no FPE for acos(-5.0) janus at gcc dot gnu dot org
` (7 preceding siblings ...)
2009-02-27 10:49 ` burnus at gcc dot gnu dot org
@ 2009-02-27 13:15 ` janus at gcc dot gnu dot org
2009-03-10 15:30 ` burnus at gcc dot gnu dot org
` (2 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: janus at gcc dot gnu dot org @ 2009-02-27 13:15 UTC (permalink / raw)
To: gcc-bugs
------- Comment #9 from janus at gcc dot gnu dot org 2009-02-27 13:15 -------
(In reply to comment #8)
> If it works with some but not all libm routines, it sounds more like a GLIBC
> than like a GCC problem.
Can someone reproduce this with C code?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39314
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug fortran/39314] -ffpe-trap=invalid gives no FPE for acos(-5.0)
2009-02-26 15:28 [Bug fortran/39314] New: -ffpe-trap=invalid gives no FPE for acos(-5.0) janus at gcc dot gnu dot org
` (8 preceding siblings ...)
2009-02-27 13:15 ` janus at gcc dot gnu dot org
@ 2009-03-10 15:30 ` burnus at gcc dot gnu dot org
2009-03-28 8:44 ` [Bug libfortran/39314] " fxcoudert at gcc dot gnu dot org
2009-03-28 12:24 ` burnus at gcc dot gnu dot org
11 siblings, 0 replies; 13+ messages in thread
From: burnus at gcc dot gnu dot org @ 2009-03-10 15:30 UTC (permalink / raw)
To: gcc-bugs
------- Comment #10 from burnus at gcc dot gnu dot org 2009-03-10 15:29 -------
> Can someone reproduce this with C code?
Yes: The following gives a SIGFPE with -m32 (logf, sqrtf) and with -m64 and
"sqrtf" but not with -m64 with "logf". (Compile with "-fsignaling-nans" and
"-lm".)
-----------------<cut>--------------------
#ifndef __SUPPORT_SNAN__
# error No SNAN support - use "-fsignaling-nans"
#endif
#define _WANT_SNAN 1
#include <stdio.h>
#include <math.h>
#include <fenv.h>
int main()
{
float x = -5.0, y;
feenableexcept(FE_ALL_EXCEPT);
y = logf(x);
printf("%e\n",y);
return 0;
}
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39314
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug libfortran/39314] -ffpe-trap=invalid gives no FPE for acos(-5.0)
2009-02-26 15:28 [Bug fortran/39314] New: -ffpe-trap=invalid gives no FPE for acos(-5.0) janus at gcc dot gnu dot org
` (9 preceding siblings ...)
2009-03-10 15:30 ` burnus at gcc dot gnu dot org
@ 2009-03-28 8:44 ` fxcoudert at gcc dot gnu dot org
2009-03-28 12:24 ` burnus at gcc dot gnu dot org
11 siblings, 0 replies; 13+ messages in thread
From: fxcoudert at gcc dot gnu dot org @ 2009-03-28 8:44 UTC (permalink / raw)
To: gcc-bugs
------- Comment #11 from fxcoudert at gcc dot gnu dot org 2009-03-28 08:44 -------
The x86_64 FPE code in libgfortran works fine, as evidenced by the fact that it
works with some glibcs (RedHat's glibc-2.5 for example) and on Mac OS 10.5.6
(which uses the same FPE setter). Closing as INVALID, please report to glibc or
distro vendor (Tobias did it with Novell here:
https://bugzilla.novell.com/show_bug.cgi?id=487576)
--
fxcoudert at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Component|fortran |libfortran
Resolution| |INVALID
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39314
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug libfortran/39314] -ffpe-trap=invalid gives no FPE for acos(-5.0)
2009-02-26 15:28 [Bug fortran/39314] New: -ffpe-trap=invalid gives no FPE for acos(-5.0) janus at gcc dot gnu dot org
` (10 preceding siblings ...)
2009-03-28 8:44 ` [Bug libfortran/39314] " fxcoudert at gcc dot gnu dot org
@ 2009-03-28 12:24 ` burnus at gcc dot gnu dot org
11 siblings, 0 replies; 13+ messages in thread
From: burnus at gcc dot gnu dot org @ 2009-03-28 12:24 UTC (permalink / raw)
To: gcc-bugs
------- Comment #12 from burnus at gcc dot gnu dot org 2009-03-28 12:23 -------
On #gcc it was confirmed to give a SIGFPE on gentoo with glibc 2.9 on x86-64. I
think it is one of the @amd.com patches for x86-64 which fixes some performance
problems but has the side effect that it doesn't honour the FPE.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39314
^ permalink raw reply [flat|nested] 13+ messages in thread
end of thread, other threads:[~2009-03-28 12:24 UTC | newest]
Thread overview: 13+ messages (download: mbox.gz / follow: Atom feed)
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2009-02-26 15:28 [Bug fortran/39314] New: -ffpe-trap=invalid gives no FPE for acos(-5.0) janus at gcc dot gnu dot org
2009-02-26 15:35 ` [Bug fortran/39314] " kargl at gcc dot gnu dot org
2009-02-26 15:45 ` janus at gcc dot gnu dot org
2009-02-26 18:04 ` burnus at gcc dot gnu dot org
2009-02-26 18:05 ` pinskia at gcc dot gnu dot org
2009-02-26 19:22 ` janus at gcc dot gnu dot org
2009-02-27 9:02 ` janus at gcc dot gnu dot org
2009-02-27 9:13 ` janus at gcc dot gnu dot org
2009-02-27 10:49 ` burnus at gcc dot gnu dot org
2009-02-27 13:15 ` janus at gcc dot gnu dot org
2009-03-10 15:30 ` burnus at gcc dot gnu dot org
2009-03-28 8:44 ` [Bug libfortran/39314] " fxcoudert at gcc dot gnu dot org
2009-03-28 12:24 ` burnus at gcc dot gnu dot org
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