GCC Bugzilla Bug 20583

This might be related to PR20447 or PR18592. 
 
$ m68k-linux-gcc -O -S iso-2022-cn-ext.i 
iso-2022-cn-ext.i: In function ‘gconv’: 
iso-2022-cn-ext.i:85: internal compiler error: output_operand: invalid 
expression as operand 
Please submit a full bug report, 
with preprocessed source if appropriate. 
See <URL:http://gcc.gnu.org/bugs.html> for instructions.

Created an attachment (id=8430) [edit]
Testcase

That's the same one I mentioned in
http://gcc.gnu.org/ml/gcc/2005-03/msg00991.html
I was going to report it, but you beat me to it,
and you did a better job of minimizing the test
case thank I did. Thanks!

What does it take to confirm the bug?

Still seeing this on 4.0.0-rc1.

Confirmed.

Still seeing this on gcc-4.0.1-20050702.

m68k is not a primary or secondary platform; removing target milestone.

Reduced down to:

void bar (unsigned int);

void
foo (void)
{
  char buf[1] = { 3 };
  const char *p = buf;
  const char **q = &p;
  unsigned int ch;
  switch (**q)
    {
    case 1:  ch = 5; break;
    case 2:  ch = 4; break;
    case 3:  ch = 3; break;
    case 4:  ch = 2; break;
    case 5:  ch = 1; break;
    default: ch = 0; break;
    }
  bar (ch);
}

This is one of those rare cases where CSE1 folds a switch statement.

Subject: Bug 20583

Author: kazu
Date: Mon Nov 21 04:41:38 2005
New Revision: 107278

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=107278
Log:
gcc/
        PR middle-end/20583
        * cse.c (cse_insn): Reject invalid forms of CONST earlier.

gcc/testsuite/
        PR middle-end/20583
        * gcc.c-torture/compile/pr20583.c: New.

Added:
    trunk/gcc/testsuite/gcc.c-torture/compile/pr20583.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/cse.c
    trunk/gcc/testsuite/ChangeLog

Subject: Bug 20583

Author: kazu
Date: Mon Nov 21 06:52:01 2005
New Revision: 107281

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=107281
Log:
gcc/
        PR middle-end/20583
        * cse.c (cse_insn): Reject invalid forms of CONST earlier.

gcc/testsuite/
        PR middle-end/20583
        * gcc.c-torture/compile/pr20583.c: New.

Added:
    branches/gcc-4_1-branch/gcc/testsuite/gcc.c-torture/pr20583.c
Modified:
    branches/gcc-4_1-branch/gcc/ChangeLog
    branches/gcc-4_1-branch/gcc/cse.c
    branches/gcc-4_1-branch/gcc/testsuite/ChangeLog

Fixed in 4.1.0 and above for now.

Unassignining myself.

*** Bug 28092 has been marked as a duplicate of this bug. ***

Fixed in 4.1.0.