[Bug c/19423] New: -Os causes internal compiler error in gcc-3.4-20050107

[dcb314 at hotmail dot com]

I ran the compiler

[dcb@localhost src]$ ~/gnu/20050107/results/bin/gcc -Os -c b.c
b.c: In function `__ansicon_write':
b.c:57: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.

I tried valgrind

[dcb@localhost src]$ ~/valgrind/results.220/bin/valgrind -q --trace-children=yes
--tool=memcheck ~/gnu/20050107/results/bin/gcc -Os -c b.c
==5131== Invalid read of size 2
==5131==    at 0x8290EB5: memory_operand (recog.c:1336)
==5131==    by 0x81AE70D: get_attr_memory (insn-attrtab.c:24474)
==5131==    by 0x81C7BBD: result_ready_cost (insn-attrtab.c:19373)
==5131==    by 0x835C78B: priority (haifa-sched.c:881)
==5131==  Address 0xABABABAB is not stack'd, malloc'd or (recently) free'd

The source code is

--------------------------------------------------------------------------------
typedef unsigned char uint8_t;
typedef unsigned short uint16_t;
typedef unsigned int size_t;
typedef signed int ptrdiff_t;
typedef ptrdiff_t ssize_t;

struct curxy {
  uint8_t x, y;
} __attribute__((packed));

enum ansi_state {
  st_init,
  st_esc,
  st_csi,
};

struct term_state {
  int disabled;
  enum ansi_state state;
};

static struct term_state st;

static void ansicon_putchar(int ch)
{
  const int rows = (*(uint8_t *)0x484) ? (*(uint8_t *)0x484)+1 : 25;
  const int cols = (*(uint16_t *)0x44A);
  const int page = (*(uint8_t *)0x462);
  struct curxy xy = ((struct curxy *)0x450)[page];

  switch ( st.state ) {
  case st_init:
    switch ( ch ) {
    case '\b':
      if ( xy.x > 0 ) xy.x--;
      break;
    }
    break;
  }

  while ( xy.y >= rows ) {
  }
}

ssize_t __ansicon_write( const void *buf, size_t count)
{
  const unsigned char *bufp = buf;
  size_t n = 0;

  while ( count-- ) {
    ansicon_putchar(*bufp++);
  }

  return n;
}
---------------------------------------------------------------------------

-- 
           Summary: -Os causes internal compiler error in gcc-3.4-20050107
           Product: gcc
           Version: 3.4.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dcb314 at hotmail dot com
                CC: gcc-bugs at gcc dot gnu dot org
  GCC host triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19423