Re: Constant folding and Constant propagation

[Jean Christophe Beyler]

I set up your patch and I get an internal error on this test program:

extern void foo(int, int);
extern int bar(void);
int startup;

void foobar()
{
  int i;
  while(1)
  {
    if (bar()) {
        foo(0,0);
    }
  }
}

Here's the error:
/home/beyler/cyclops64/src/tnt/kernel/process_manager/testnode.c: In
function 'foobar':
/home/beyler/cyclops64/src/tnt/kernel/process_manager/testnode.c:15:
internal compiler error: in insert_regs, at cse.c:1156
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.


I think it's got something to do with my machine description but this
only happens when the values of foo are both 0. I haven't found
another case where it fails. It seems when the compiler sees two
constants 0 for the register (r8 which is my first input register), it
fails on the second. Somewhere between both calls, it must remove the
quantity.

Any ideas ?
Jc