[Bug middle-end/34878] New: fast-math-pr33299.f90 failure with illegal instruction due to -ffast-math.

[Bug middle-end/34878] New: fast-math-pr33299.f90 failure with illegal instruction due to -ffast-math.

[kargl at gcc dot gnu dot org]

Bootstrap of revision 131654.  Testsuite has one failure.


Executing on host: /home/kargl/gcc/obj4x/gcc/testsuite/gfortran/../../gfortran
-B/home/kargl/gcc/obj4x/
gcc/testsuite/gfortran/../../
/home/kargl/gcc/gcc4x/gcc/testsuite/gfortran.dg/vect/fast-math-pr33299.f9
0   -O2 -ftree-vectorize -fno-vect-cost-model -ftree-vectorizer-verbose=4
-fdump-tree-vect-stats -msse2
 -ffast-math 
-L/home/kargl/gcc/obj4x/i386-unknown-freebsd8.0/./libgfortran/.libs
-L/home/kargl/gcc/obj
4x/i386-unknown-freebsd8.0/./libgfortran/.libs
-L/home/kargl/gcc/obj4x/i386-unknown-freebsd8.0/./libibe
rty  -lm   -o ./fast-math-pr33299.exe    (timeout = 300)
PASS: gfortran.dg/vect/fast-math-pr33299.f90 (test for excess errors)
Setting LD_LIBRARY_PATH to
.:/home/kargl/gcc/obj4x/i386-unknown-freebsd8.0/./libgfortran/.libs:/home/ka
rgl/gcc/obj4x/i386-unknown-freebsd8.0/./libgfortran/.libs:/home/kargl/gcc/obj4x/gcc:.:/home/kargl/gcc/o
bj4x/i386-unknown-freebsd8.0/./libgfortran/.libs:/home/kargl/gcc/obj4x/i386-unknown-freebsd8.0/./libgfo
rtran/.libs:/home/kargl/gcc/obj4x/gcc
FAIL: gfortran.dg/vect/fast-math-pr33299.f90 execution test


This is a -ffast-math issue as illustrated by 2 command lines.  I copied the
guilty program into tmp/

kargl[205] gfc4x -o z -O2 -ftree-vectorize -fno-vect-cost-model
-ftree-vectorize
r-verbose=4 -fdump-tree-vect-stats -fdump-tree-vect-stats -msse2
fast-math-pr332
99.f90
kargl[206] ./z
kargl[207] gfc4x -o z -O2 -ftree-vectorize -fno-vect-cost-model
-ftree-vectorize
r-verbose=4 -fdump-tree-vect-stats -fdump-tree-vect-stats -msse2  -ffast-math
fa
st-math-pr33299.f90
kargl[208] ./z
Illegal instruction (core dumped)


-- 
           Summary: fast-math-pr33299.f90 failure with illegal instruction
                    due to -ffast-math.
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: kargl at gcc dot gnu dot org
  GCC host triplet: i386-unknown-freebsd8.


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34878

[Bug target/34878] fast-math-pr33299.f90 failure with illegal instruction due to -ffast-math.

[sgk at troutmask dot apl dot washington dot edu]

------- Comment #2 from sgk at troutmask dot apl dot washington dot edu  2008-01-20 04:17 -------
Subject: Re:  fast-math-pr33299.f90 failure with illegal instruction due to
-ffast-math.

On Sun, Jan 20, 2008 at 04:09:19AM -0000, pinskia at gcc dot gnu dot org wrote:
> 
> What instructions is causing the crash?
> 
> Are you testing on a machine which has SSE2 ?
> 

Nope.  From FreeBSD's dmesg:

CPU: AMD Athlon(tm) Processor (1208.75-MHz 686-class CPU)
  Origin = "AuthenticAMD"  Id = 0x642  Stepping = 2
 
Features=0x183f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR>
  AMD Features=0xc0440800<SYSCALL,<b18>,MMX+,3DNow!+,3DNow!>

SSE2 isn't one of the listed features.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34878

[Bug target/34878] fast-math-pr33299.f90 failure with illegal instruction due to -ffast-math.

[pinskia at gcc dot gnu dot org]

------- Comment #1 from pinskia at gcc dot gnu dot org  2008-01-20 04:09 -------
What instructions is causing the crash?

Are you testing on a machine which has SSE2 ?


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34878

[Bug testsuite/34878] fast-math-pr33299.f90 failure with illegal instruction due to -ffast-math.

[pinskia at gcc dot gnu dot org]

------- Comment #3 from pinskia at gcc dot gnu dot org  2008-01-20 04:19 -------
There is the issue, the testcase should be not run on your computer as it is
using SSE2.  So this is a testsuite issue.


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|target                      |testsuite


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34878

[Bug testsuite/34878] fast-math-pr33299.f90 failure with illegal instruction due to -ffast-math.

[ubizjak at gmail dot com]

------- Comment #4 from ubizjak at gmail dot com  2008-01-20 15:34 -------
(In reply to comment #3)
> There is the issue, the testcase should be not run on your computer as it is
> using SSE2.  So this is a testsuite issue.

Please look at gcc.dg/vect/ how this should be done. There is a check_vect ()
call before each runtime test (check_vect is in tree-vect.h). I think that
fortran vectorizer tests should call this test too - perhaps via C bindings?


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34878

[Bug testsuite/34878] fast-math-pr33299.f90 failure with illegal instruction due to -ffast-math.

[pinskia at gcc dot gnu dot org]

------- Comment #5 from pinskia at gcc dot gnu dot org  2008-01-26 22:58 -------
*** Bug 34987 has been marked as a duplicate of this bug. ***


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jvdelisle at gcc dot gnu dot
                   |                            |org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34878

[Bug testsuite/34878] fast-math-pr33299.f90 failure with illegal instruction due to -ffast-math.

[ghazi at gcc dot gnu dot org]

------- Comment #6 from ghazi at gcc dot gnu dot org  2008-02-26 17:53 -------
Isn't this a dup of 34168?


-- 

ghazi at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ghazi at gcc dot gnu dot org
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2008-02-26 17:53:52
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34878

[Bug testsuite/34878] fast-math-pr33299.f90 failure with illegal instruction due to -ffast-math.

[sgk at troutmask dot apl dot washington dot edu]

------- Comment #7 from sgk at troutmask dot apl dot washington dot edu  2008-02-26 18:00 -------
Subject: Re:  fast-math-pr33299.f90 failure with illegal instruction due to
-ffast-math.

On Tue, Feb 26, 2008 at 05:53:52PM -0000, ghazi at gcc dot gnu dot org wrote:
> 
> ------- Comment #6 from ghazi at gcc dot gnu dot org  2008-02-26 17:53 -------
> Isn't this a dup of 34168?
> 

It appears to be.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34878

[Bug testsuite/34878] fast-math-pr33299.f90 failure with illegal instruction due to -ffast-math.

[ghazi at gcc dot gnu dot org]

------- Comment #8 from ghazi at gcc dot gnu dot org  2008-02-26 18:29 -------
(In reply to comment #7)
> > Isn't this a dup of 34168?
> > 
> It appears to be.

Can you implement Uros' suggestion?


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34878

[Bug testsuite/34878] fast-math-pr33299.f90 failure with illegal instruction due to -ffast-math.

[victork at gcc dot gnu dot org]

------- Comment #9 from victork at gcc dot gnu dot org  2008-03-19 09:31 -------


*** This bug has been marked as a duplicate of 34168 ***


-- 

victork at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |DUPLICATE


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34878