optimization/7335: Sparc: ICE in verify_wide_reg (flow.c:557) with long double and optimization

[wolfgang.bangerth@iwr.uni-heidelberg.de]

>Number:         7335
>Category:       optimization
>Synopsis:       Sparc: ICE in verify_wide_reg (flow.c:557) with long double and optimization
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jul 17 02:26:03 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Wolfgang Bangerth
>Release:        gcc3.1, gcc3.1.1 pre of 20020624
>Organization:
>Environment:
sparc-sun-solaris2.8/9
>Description:
gcc ICEs upon the following (simple, common) code when compiling with -O1 on sparc machines:
-------------------------------------------------
double* copy(long double* first, long double* last, double* result)
{
  int n;
  for (n = last - first; n > 0; --n) {
    *result = *first;
    ++first;
    ++result;
  }
  return result;
}

void f()
{
  long double *p1, *p2;
  double *p3;
  copy (p1, p2, p3);
  p3 = copy (p1, p2, p3);
};
----------------------------------------------------

deal.II/base> ~/bin/sparc-sun-solaris2.9/bin/gcc -v
Reading specs from /home/atlas2/wolf/bin/sparc-sun-solaris2.9/bin/../lib/gcc-lib/sparc-sun-solaris2.9/3.1.1/specs
Configured with: ../gcc-20020624/configure --prefix=/home/people/wolf/bin/sparc-sun-solaris2.9 --enable-languages=c,c++
Thread model: posix
gcc version 3.1.1 20020624 (prerelease)

deal.II/base> ~/bin/sparc-sun-solaris2.9/bin/gcc -O1 -c t.c
t.c: In function `copy':
t.c:10: Internal compiler error in verify_wide_reg, at flow.c:557
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.
>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: