------- Comment #2 from jpr at csc dot fi 2010-09-20 06:54 -------
Created an attachment (id=21842)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=21842&action=view)
somewhat reduced testcase
Hi,
I tried debugging this more. Attached is a somewhat reduced testcase. I also
had a look at the assembler generated by
"x86_64-w64-mingw32-gfortran -save-temps -O1 fail1.f90".
The loadinp looks like
...
loadinp_:
subq $56, %rsp
movl $1952671091, 32(%rsp)
movw $28521, 36(%rsp)
movb $110, 38(%rsp)
leaq 32(%rsp), %r10
call parse_sect.1525
... so it stores the 'section' string to stack and loads %r10 with
the stack address and calls the parse_sect:
....
parse_sect.1525:
pushq %rdi
pushq %rsi
pushq %rbx
movl $4032, %eax
call ___chkstk
movq %r10, %rsi
....
which then uses the stack address in %r10. The thing is that the
__chkstk() call seems to change the contents of the
%r10. At least doing
...
movq %r10,%r12
call __chkstk
movq %r12,%r10
...
seems to cure the example. What is really going on, anyone?
Br, Juha
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45694
