Re: Speeding up ggc-simple on stage1

[Richard Henderson <rth at cygnus dot com>]

On Sat, Jan 15, 2000 at 11:00:50PM -0200, Alexandre Oliva wrote:
> But attacking the hot spots is precisely what I'm doing.  ggc-simple
> seems to be just too slow.

I've just remembered something.  This is AIX 4.1 you're
working on right?  It has mmap.  What it doesn't do is 
pass the normal can-we-force-map-anywhere default test
that autoconf uses.

I'm thinking a test like this would be more useful for us.

Comments?


r~
#include <sys/types.h>
#include <sys/mman.h>
#include <unistd.h>
#include <fcntl.h>

int main()
{
  void *x;
  int fd, pg;

  fd = open("/dev/zero", O_RDWR);
  if (fd < 0)
    return 1;

  pg = getpagesize();
  x = mmap(0, pg, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
  if (x == (void *) -1)
    return 2;

  *(int *)x += 1;

  if (munmap(x, pg) < 0)
    return 3;

  return 0;
}