------- Additional Comments From bangerth at dealii dot org 2004-12-13 20:18
-------
Here is a small testcase that segfaults in a movapd instruction
when compiled with the 3.4 branch:
----------------------------
subroutine choleskyzhp (a)
integer i,j,k
complex*16 a(5,5),x
do j = 1,5
do i = j,5
do k = 1,j-1
x = a(i,k)*dconjg(a(j,k))
enddo
a(i,j) = x
enddo
enddo
return
end
program test
complex*16 work(5,5,2)
call choleskyzhp(work(1,1,2))
return
end
--------------------------
g/x> /home/bangerth/bin/gcc-3.4.*-pre/bin/g77 -O -msse2 -g x.f ; ./a.out
g/x> /home/bangerth/bin/gcc-3.4.*-pre/bin/g77 -O -msse2 -mfpmath=sse -g
x.f ; ./a.out
Segmentation fault
(gdb) r
`/home/bangerth/tmp/g/x/a.out' has changed; re-reading symbols.
Starting program: /home/bangerth/tmp/g/x/a.out
Program received signal SIGSEGV, Segmentation fault.
0x08048636 in choleskyzhp_ (a=0xbfffe920) at x.f:12
(gdb) disass
Dump of assembler code for function choleskyzhp_:
[...]
0x08048636 <choleskyzhp_+34>: movapd %xmm0,0xffffffc8(%ebp)
Given that g77 doesn't exist any more on mainline, I don't know how to
reproduce this bug there. Maybe some of the other dups listed in PR 17990
can help. I'll take a look.
W.
--
What |Removed |Added
----------------------------------------------------------------------------
Known to fail| |3.4.3
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14776
