Re: target/7730: miscompilation of x86 inline assembly

Re: target/7730: miscompilation of x86 inline assembly

[hubicka]

Synopsis: miscompilation of x86 inline assembly

State-Changed-From-To: open->closed
State-Changed-By: hubicka
State-Changed-When: Thu Oct 10 11:41:42 2002
State-Changed-Why:
    It is not possible to change stack in ASM statement block and expect operands to be corrected.
    All operands are valid only before the first ASM instruction

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7730

target/7730: miscompilation of x86 inline assembly

[ewald]

>Number:         7730
>Category:       target
>Synopsis:       miscompilation of x86 inline assembly
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Mon Aug 26 16:06:00 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     ewald@rambo.its.tudelft.nl
>Release:        gcc (GCC) 3.2 (Red Hat Linux Rawhide 3.2-1)
>Organization:
>Environment:
OS:Red Hat Linux 7.3.94 (null), CPU:Athlon-XP
>Description:
When using local variables as memory operands to inline assembly blocks and changing the stack pointer inside this block of assembly code, the assembler assumes the stack pointer to be a fixed value and the wrong local variables are used. This is caused by not using the stack frame pointer (ebp) for local variables, but the stack pointer (esp).

This results in the wrong assembler output and segmentation faults in some applications (like 'Noatun', KDE Media Player). The inline assembler assumes that the stack pointer is fixed, which results in the wrong variables to be used.

The attached file demonstrates this problem. The output for test1() and test2() should be equal, but it's not.
>How-To-Repeat:
gcc -O2 gcc32bug.c

// output of test1() and test2() is different (run a.out)
>Fix:
These functions should force the use of the stack frame pointer to fix this problem (IMHO).
>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: text/plain; name="gcc32bug.i"
Content-Disposition: inline; filename="gcc32bug.i"

# 1 "gcc32bug.c"
# 1 "<built-in>"
# 1 "<command line>"
# 1 "gcc32bug.c"





# 1 "/usr/include/stdio.h" 1 3
# 28 "/usr/include/stdio.h" 3
# 1 "/usr/include/features.h" 1 3
# 291 "/usr/include/features.h" 3
# 1 "/usr/include/sys/cdefs.h" 1 3
# 292 "/usr/include/features.h" 2 3
# 320 "/usr/include/features.h" 3
# 1 "/usr/include/gnu/stubs.h" 1 3
# 321 "/usr/include/features.h" 2 3
# 29 "/usr/include/stdio.h" 2 3





# 1 "/usr/lib/gcc-lib/i386-redhat-linux/3.2/include/stddef.h" 1 3
# 201 "/usr/lib/gcc-lib/i386-redhat-linux/3.2/include/stddef.h" 3
typedef unsigned int size_t;
# 35 "/usr/include/stdio.h" 2 3

# 1 "/usr/include/bits/types.h" 1 3
# 29 "/usr/include/bits/types.h" 3
# 1 "/usr/lib/gcc-lib/i386-redhat-linux/3.2/include/stddef.h" 1 3
# 30 "/usr/include/bits/types.h" 2 3


typedef unsigned char __u_char;
typedef unsigned short __u_short;
typedef unsigned int __u_int;
typedef unsigned long __u_long;

__extension__ typedef unsigned long long int __u_quad_t;
__extension__ typedef long long int __quad_t;
# 49 "/usr/include/bits/types.h" 3
typedef signed char __int8_t;
typedef unsigned char __uint8_t;
typedef signed short int __int16_t;
typedef unsigned short int __uint16_t;
typedef signed int __int32_t;
typedef unsigned int __uint32_t;

__extension__ typedef signed long long int __int64_t;
__extension__ typedef unsigned long long int __uint64_t;

typedef __quad_t *__qaddr_t;

typedef __u_quad_t __dev_t;
typedef __u_int __uid_t;
typedef __u_int __gid_t;
typedef __u_long __ino_t;
typedef __u_int __mode_t;
typedef __u_int __nlink_t;
typedef long int __off_t;
typedef __quad_t __loff_t;
typedef int __pid_t;
typedef int __ssize_t;
typedef __u_long __rlim_t;
typedef __u_quad_t __rlim64_t;
typedef __u_int __id_t;

typedef struct
  {
    int __val[2];
  } __fsid_t;


typedef int __daddr_t;
typedef char *__caddr_t;
typedef long int __time_t;
typedef unsigned int __useconds_t;
typedef long int __suseconds_t;
typedef long int __swblk_t;

typedef long int __clock_t;


typedef int __clockid_t;


typedef int __timer_t;






typedef int __key_t;


typedef unsigned short int __ipc_pid_t;



typedef long int __blksize_t;




typedef long int __blkcnt_t;
typedef __quad_t __blkcnt64_t;


typedef __u_long __fsblkcnt_t;
typedef __u_quad_t __fsblkcnt64_t;


typedef __u_long __fsfilcnt_t;
typedef __u_quad_t __fsfilcnt64_t;


typedef __u_quad_t __ino64_t;


typedef __loff_t __off64_t;


typedef long int __t_scalar_t;
typedef unsigned long int __t_uscalar_t;


typedef int __intptr_t;


typedef unsigned int __socklen_t;




# 1 "/usr/include/bits/pthreadtypes.h" 1 3
# 23 "/usr/include/bits/pthreadtypes.h" 3
# 1 "/usr/include/bits/sched.h" 1 3
# 68 "/usr/include/bits/sched.h" 3
struct __sched_param
  {
    int __sched_priority;
  };
# 24 "/usr/include/bits/pthreadtypes.h" 2 3


struct _pthread_fastlock
{
  long int __status;
  int __spinlock;

};



typedef struct _pthread_descr_struct *_pthread_descr;





typedef struct __pthread_attr_s
{
  int __detachstate;
  int __schedpolicy;
  struct __sched_param __schedparam;
  int __inheritsched;
  int __scope;
  size_t __guardsize;
  int __stackaddr_set;
  void *__stackaddr;
  size_t __stacksize;
} pthread_attr_t;



typedef struct
{
  struct _pthread_fastlock __c_lock;
  _pthread_descr __c_waiting;
} pthread_cond_t;



typedef struct
{
  int __dummy;
} pthread_condattr_t;


typedef unsigned int pthread_key_t;





typedef struct
{
  int __m_reserved;
  int __m_count;
  _pthread_descr __m_owner;
  int __m_kind;
  struct _pthread_fastlock __m_lock;
} pthread_mutex_t;



typedef struct
{
  int __mutexkind;
} pthread_mutexattr_t;



typedef int pthread_once_t;
# 140 "/usr/include/bits/pthreadtypes.h" 3
typedef unsigned long int pthread_t;
# 144 "/usr/include/bits/types.h" 2 3
# 37 "/usr/include/stdio.h" 2 3
# 45 "/usr/include/stdio.h" 3
typedef struct _IO_FILE FILE;
# 55 "/usr/include/stdio.h" 3
typedef struct _IO_FILE __FILE;
# 65 "/usr/include/stdio.h" 3
# 1 "/usr/include/libio.h" 1 3
# 32 "/usr/include/libio.h" 3
# 1 "/usr/include/_G_config.h" 1 3
# 14 "/usr/include/_G_config.h" 3
# 1 "/usr/lib/gcc-lib/i386-redhat-linux/3.2/include/stddef.h" 1 3
# 294 "/usr/lib/gcc-lib/i386-redhat-linux/3.2/include/stddef.h" 3
typedef long int wchar_t;
# 321 "/usr/lib/gcc-lib/i386-redhat-linux/3.2/include/stddef.h" 3
typedef unsigned int wint_t;
# 15 "/usr/include/_G_config.h" 2 3
# 24 "/usr/include/_G_config.h" 3
# 1 "/usr/include/wchar.h" 1 3
# 48 "/usr/include/wchar.h" 3
# 1 "/usr/lib/gcc-lib/i386-redhat-linux/3.2/include/stddef.h" 1 3
# 49 "/usr/include/wchar.h" 2 3

# 1 "/usr/include/bits/wchar.h" 1 3
# 51 "/usr/include/wchar.h" 2 3
# 67 "/usr/include/wchar.h" 3
typedef struct
{
  int __count;
  union
  {
    wint_t __wch;
    char __wchb[4];
  } __value;
} __mbstate_t;
# 25 "/usr/include/_G_config.h" 2 3

typedef struct
{
  __off_t __pos;
  __mbstate_t __state;
} _G_fpos_t;
typedef struct
{
  __off64_t __pos;
  __mbstate_t __state;
} _G_fpos64_t;
# 44 "/usr/include/_G_config.h" 3
# 1 "/usr/include/gconv.h" 1 3
# 28 "/usr/include/gconv.h" 3
# 1 "/usr/include/wchar.h" 1 3
# 48 "/usr/include/wchar.h" 3
# 1 "/usr/lib/gcc-lib/i386-redhat-linux/3.2/include/stddef.h" 1 3
# 49 "/usr/include/wchar.h" 2 3
# 29 "/usr/include/gconv.h" 2 3


# 1 "/usr/lib/gcc-lib/i386-redhat-linux/3.2/include/stddef.h" 1 3
# 32 "/usr/include/gconv.h" 2 3





enum
{
  __GCONV_OK = 0,
  __GCONV_NOCONV,
  __GCONV_NODB,
  __GCONV_NOMEM,

  __GCONV_EMPTY_INPUT,
  __GCONV_FULL_OUTPUT,
  __GCONV_ILLEGAL_INPUT,
  __GCONV_INCOMPLETE_INPUT,

  __GCONV_ILLEGAL_DESCRIPTOR,
  __GCONV_INTERNAL_ERROR
};



enum
{
  __GCONV_IS_LAST = 0x0001,
  __GCONV_IGNORE_ERRORS = 0x0002
};



struct __gconv_step;
struct __gconv_step_data;
struct __gconv_loaded_object;
struct __gconv_trans_data;



typedef int (*__gconv_fct) (struct __gconv_step *, struct __gconv_step_data *,
                            __const unsigned char **, __const unsigned char *,
                            unsigned char **, size_t *, int, int);


typedef int (*__gconv_init_fct) (struct __gconv_step *);
typedef void (*__gconv_end_fct) (struct __gconv_step *);



typedef int (*__gconv_trans_fct) (struct __gconv_step *,
                                  struct __gconv_step_data *, void *,
                                  __const unsigned char *,
                                  __const unsigned char **,
                                  __const unsigned char *, unsigned char **,
                                  size_t *);


typedef int (*__gconv_trans_context_fct) (void *, __const unsigned char *,
                                          __const unsigned char *,
                                          unsigned char *, unsigned char *);


typedef int (*__gconv_trans_query_fct) (__const char *, __const char ***,
                                        size_t *);


typedef int (*__gconv_trans_init_fct) (void **, const char *);
typedef void (*__gconv_trans_end_fct) (void *);

struct __gconv_trans_data
{

  __gconv_trans_fct __trans_fct;
  __gconv_trans_context_fct __trans_context_fct;
  __gconv_trans_end_fct __trans_end_fct;
  void *__data;
  struct __gconv_trans_data *__next;
};



struct __gconv_step
{
  struct __gconv_loaded_object *__shlib_handle;
  __const char *__modname;

  int __counter;

  char *__from_name;
  char *__to_name;

  __gconv_fct __fct;
  __gconv_init_fct __init_fct;
  __gconv_end_fct __end_fct;



  int __min_needed_from;
  int __max_needed_from;
  int __min_needed_to;
  int __max_needed_to;


  int __stateful;

  void *__data;
};



struct __gconv_step_data
{
  unsigned char *__outbuf;
  unsigned char *__outbufend;



  int __flags;



  int __invocation_counter;



  int __internal_use;

  __mbstate_t *__statep;
  __mbstate_t __state;



  struct __gconv_trans_data *__trans;
};



typedef struct __gconv_info
{
  size_t __nsteps;
  struct __gconv_step *__steps;
  __extension__ struct __gconv_step_data __data [];
} *__gconv_t;
# 45 "/usr/include/_G_config.h" 2 3
typedef union
{
  struct __gconv_info __cd;
  struct
  {
    struct __gconv_info __cd;
    struct __gconv_step_data __data;
  } __combined;
} _G_iconv_t;

typedef int _G_int16_t __attribute__ ((__mode__ (__HI__)));
typedef int _G_int32_t __attribute__ ((__mode__ (__SI__)));
typedef unsigned int _G_uint16_t __attribute__ ((__mode__ (__HI__)));
typedef unsigned int _G_uint32_t __attribute__ ((__mode__ (__SI__)));
# 33 "/usr/include/libio.h" 2 3
# 53 "/usr/include/libio.h" 3
# 1 "/usr/lib/gcc-lib/i386-redhat-linux/3.2/include/stdarg.h" 1 3
# 43 "/usr/lib/gcc-lib/i386-redhat-linux/3.2/include/stdarg.h" 3
typedef __builtin_va_list __gnuc_va_list;
# 54 "/usr/include/libio.h" 2 3
# 160 "/usr/include/libio.h" 3
struct _IO_jump_t; struct _IO_FILE;
# 170 "/usr/include/libio.h" 3
typedef void _IO_lock_t;





struct _IO_marker {
  struct _IO_marker *_next;
  struct _IO_FILE *_sbuf;



  int _pos;
# 193 "/usr/include/libio.h" 3
};


enum __codecvt_result
{
  __codecvt_ok,
  __codecvt_partial,
  __codecvt_error,
  __codecvt_noconv
};
# 261 "/usr/include/libio.h" 3
struct _IO_FILE {
  int _flags;




  char* _IO_read_ptr;
  char* _IO_read_end;
  char* _IO_read_base;
  char* _IO_write_base;
  char* _IO_write_ptr;
  char* _IO_write_end;
  char* _IO_buf_base;
  char* _IO_buf_end;

  char *_IO_save_base;
  char *_IO_backup_base;
  char *_IO_save_end;

  struct _IO_marker *_markers;

  struct _IO_FILE *_chain;

  int _fileno;
  int _blksize;
  __off_t _old_offset;



  unsigned short _cur_column;
  signed char _vtable_offset;
  char _shortbuf[1];



  _IO_lock_t *_lock;
# 305 "/usr/include/libio.h" 3
  __off64_t _offset;





  void *__pad1;
  void *__pad2;

  int _mode;

  char _unused2[15 * sizeof (int) - 2 * sizeof (void *)];

};


typedef struct _IO_FILE _IO_FILE;


struct _IO_FILE_plus;

extern struct _IO_FILE_plus _IO_2_1_stdin_;
extern struct _IO_FILE_plus _IO_2_1_stdout_;
extern struct _IO_FILE_plus _IO_2_1_stderr_;
# 344 "/usr/include/libio.h" 3
typedef __ssize_t __io_read_fn (void *__cookie, char *__buf, size_t __nbytes);







typedef __ssize_t __io_write_fn (void *__cookie, __const char *__buf,
                                 size_t __n);







typedef int __io_seek_fn (void *__cookie, __off64_t *__pos, int __w);


typedef int __io_close_fn (void *__cookie);
# 396 "/usr/include/libio.h" 3
extern int __underflow (_IO_FILE *) ;
extern int __uflow (_IO_FILE *) ;
extern int __overflow (_IO_FILE *, int) ;
extern wint_t __wunderflow (_IO_FILE *) ;
extern wint_t __wuflow (_IO_FILE *) ;
extern wint_t __woverflow (_IO_FILE *, wint_t) ;
# 426 "/usr/include/libio.h" 3
extern int _IO_getc (_IO_FILE *__fp) ;
extern int _IO_putc (int __c, _IO_FILE *__fp) ;
extern int _IO_feof (_IO_FILE *__fp) ;
extern int _IO_ferror (_IO_FILE *__fp) ;

extern int _IO_peekc_locked (_IO_FILE *__fp) ;





extern void _IO_flockfile (_IO_FILE *) ;
extern void _IO_funlockfile (_IO_FILE *) ;
extern int _IO_ftrylockfile (_IO_FILE *) ;
# 456 "/usr/include/libio.h" 3
extern int _IO_vfscanf (_IO_FILE * __restrict, const char * __restrict,
                        __gnuc_va_list, int *__restrict) ;
extern int _IO_vfprintf (_IO_FILE *__restrict, const char *__restrict,
                         __gnuc_va_list) ;
extern __ssize_t _IO_padn (_IO_FILE *, int, __ssize_t) ;
extern size_t _IO_sgetn (_IO_FILE *, void *, size_t) ;

extern __off64_t _IO_seekoff (_IO_FILE *, __off64_t, int, int) ;
extern __off64_t _IO_seekpos (_IO_FILE *, __off64_t, int) ;

extern void _IO_free_backup_area (_IO_FILE *) ;
# 66 "/usr/include/stdio.h" 2 3
# 80 "/usr/include/stdio.h" 3
typedef _G_fpos_t fpos_t;
# 129 "/usr/include/stdio.h" 3
# 1 "/usr/include/bits/stdio_lim.h" 1 3
# 130 "/usr/include/stdio.h" 2 3



extern FILE *stdin;
extern FILE *stdout;
extern FILE *stderr;
# 144 "/usr/include/stdio.h" 3
extern int remove (__const char *__filename) ;

extern int rename (__const char *__old, __const char *__new) ;




extern FILE *tmpfile (void) ;
# 163 "/usr/include/stdio.h" 3
extern char *tmpnam (char *__s) ;




extern char *tmpnam_r (char *__s) ;
# 180 "/usr/include/stdio.h" 3
extern char *tempnam (__const char *__dir, __const char *__pfx)
     __attribute__ ((__malloc__));




extern int fclose (FILE *__stream) ;

extern int fflush (FILE *__stream) ;



extern int fflush_unlocked (FILE *__stream) ;
# 203 "/usr/include/stdio.h" 3
extern FILE *fopen (__const char *__restrict __filename,
                    __const char *__restrict __modes) ;

extern FILE *freopen (__const char *__restrict __filename,
                      __const char *__restrict __modes,
                      FILE *__restrict __stream) ;
# 233 "/usr/include/stdio.h" 3
extern FILE *fdopen (int __fd, __const char *__modes) ;
# 256 "/usr/include/stdio.h" 3
extern void setbuf (FILE *__restrict __stream, char *__restrict __buf) ;



extern int setvbuf (FILE *__restrict __stream, char *__restrict __buf,
                    int __modes, size_t __n) ;




extern void setbuffer (FILE *__restrict __stream, char *__restrict __buf,
                       size_t __size) ;


extern void setlinebuf (FILE *__stream) ;




extern int fprintf (FILE *__restrict __stream,
                    __const char *__restrict __format, ...) ;

extern int printf (__const char *__restrict __format, ...) ;

extern int sprintf (char *__restrict __s,
                    __const char *__restrict __format, ...) ;


extern int vfprintf (FILE *__restrict __s, __const char *__restrict __format,
                     __gnuc_va_list __arg) ;

extern int vprintf (__const char *__restrict __format, __gnuc_va_list __arg)
     ;

extern int vsprintf (char *__restrict __s, __const char *__restrict __format,
                     __gnuc_va_list __arg) ;



extern int snprintf (char *__restrict __s, size_t __maxlen,
                     __const char *__restrict __format, ...)
     __attribute__ ((__format__ (__printf__, 3, 4)));

extern int vsnprintf (char *__restrict __s, size_t __maxlen,
                      __const char *__restrict __format, __gnuc_va_list __arg)
     __attribute__ ((__format__ (__printf__, 3, 0)));
# 327 "/usr/include/stdio.h" 3
extern int fscanf (FILE *__restrict __stream,
                   __const char *__restrict __format, ...) ;

extern int scanf (__const char *__restrict __format, ...) ;

extern int sscanf (__const char *__restrict __s,
                   __const char *__restrict __format, ...) ;
# 353 "/usr/include/stdio.h" 3
extern int fgetc (FILE *__stream) ;
extern int getc (FILE *__stream) ;


extern int getchar (void) ;







extern int getc_unlocked (FILE *__stream) ;
extern int getchar_unlocked (void) ;




extern int fgetc_unlocked (FILE *__stream) ;




extern int fputc (int __c, FILE *__stream) ;
extern int putc (int __c, FILE *__stream) ;


extern int putchar (int __c) ;







extern int fputc_unlocked (int __c, FILE *__stream) ;




extern int putc_unlocked (int __c, FILE *__stream) ;
extern int putchar_unlocked (int __c) ;





extern int getw (FILE *__stream) ;


extern int putw (int __w, FILE *__stream) ;




extern char *fgets (char *__restrict __s, int __n, FILE *__restrict __stream)
     ;
# 419 "/usr/include/stdio.h" 3
extern char *gets (char *__s) ;
# 443 "/usr/include/stdio.h" 3
extern int fputs (__const char *__restrict __s, FILE *__restrict __stream)
     ;
# 453 "/usr/include/stdio.h" 3
extern int puts (__const char *__s) ;



extern int ungetc (int __c, FILE *__stream) ;



extern size_t fread (void *__restrict __ptr, size_t __size,
                     size_t __n, FILE *__restrict __stream) ;

extern size_t fwrite (__const void *__restrict __ptr, size_t __size,
                      size_t __n, FILE *__restrict __s) ;



extern size_t fread_unlocked (void *__restrict __ptr, size_t __size,
                              size_t __n, FILE *__restrict __stream) ;
extern size_t fwrite_unlocked (__const void *__restrict __ptr, size_t __size,
                               size_t __n, FILE *__restrict __stream) ;




extern int fseek (FILE *__stream, long int __off, int __whence) ;

extern long int ftell (FILE *__stream) ;

extern void rewind (FILE *__stream) ;
# 497 "/usr/include/stdio.h" 3
extern int fgetpos (FILE *__restrict __stream, fpos_t *__restrict __pos)
     ;

extern int fsetpos (FILE *__stream, __const fpos_t *__pos) ;
# 533 "/usr/include/stdio.h" 3
extern void clearerr (FILE *__stream) ;

extern int feof (FILE *__stream) ;

extern int ferror (FILE *__stream) ;



extern void clearerr_unlocked (FILE *__stream) ;
extern int feof_unlocked (FILE *__stream) ;
extern int ferror_unlocked (FILE *__stream) ;




extern void perror (__const char *__s) ;





# 1 "/usr/include/bits/sys_errlist.h" 1 3
# 27 "/usr/include/bits/sys_errlist.h" 3
extern int sys_nerr;
extern __const char *__const sys_errlist[];
# 555 "/usr/include/stdio.h" 2 3




extern int fileno (FILE *__stream) ;




extern int fileno_unlocked (FILE *__stream) ;






extern FILE *popen (__const char *__command, __const char *__modes) ;


extern int pclose (FILE *__stream) ;





extern char *ctermid (char *__s) ;
# 608 "/usr/include/stdio.h" 3
extern void flockfile (FILE *__stream) ;



extern int ftrylockfile (FILE *__stream) ;


extern void funlockfile (FILE *__stream) ;
# 629 "/usr/include/stdio.h" 3
# 1 "/usr/include/bits/stdio.h" 1 3
# 33 "/usr/include/bits/stdio.h" 3
extern __inline int
vprintf (__const char *__restrict __fmt, __gnuc_va_list __arg)
{
  return vfprintf (stdout, __fmt, __arg);
}


extern __inline int
getchar (void)
{
  return _IO_getc (stdin);
}




extern __inline int
getc_unlocked (FILE *__fp)
{
  return ((__fp)->_IO_read_ptr >= (__fp)->_IO_read_end ? __uflow (__fp) : *(unsigned char *) (__fp)->_IO_read_ptr++);
}


extern __inline int
getchar_unlocked (void)
{
  return ((stdin)->_IO_read_ptr >= (stdin)->_IO_read_end ? __uflow (stdin) : *(unsigned char *) (stdin)->_IO_read_ptr++);
}




extern __inline int
putchar (int __c)
{
  return _IO_putc (__c, stdout);
}




extern __inline int
fputc_unlocked (int __c, FILE *__stream)
{
  return (((__stream)->_IO_write_ptr >= (__stream)->_IO_write_end) ? __overflow (__stream, (unsigned char) (__c)) : (unsigned char) (*(__stream)->_IO_write_ptr++ = (__c)));
}





extern __inline int
putc_unlocked (int __c, FILE *__stream)
{
  return (((__stream)->_IO_write_ptr >= (__stream)->_IO_write_end) ? __overflow (__stream, (unsigned char) (__c)) : (unsigned char) (*(__stream)->_IO_write_ptr++ = (__c)));
}


extern __inline int
putchar_unlocked (int __c)
{
  return (((stdout)->_IO_write_ptr >= (stdout)->_IO_write_end) ? __overflow (stdout, (unsigned char) (__c)) : (unsigned char) (*(stdout)->_IO_write_ptr++ = (__c)));
}
# 111 "/usr/include/bits/stdio.h" 3
extern __inline int
feof_unlocked (FILE *__stream)
{
  return (((__stream)->_flags & 0x10) != 0);
}


extern __inline int
ferror_unlocked (FILE *__stream)
{
  return (((__stream)->_flags & 0x20) != 0);
}
# 630 "/usr/include/stdio.h" 2 3



# 7 "gcc32bug.c" 2

static int test1()
{
    int a='a', b='b', result;

    __asm__ __volatile__(

        "xorl %%ecx, %%ecx                \n"
        "xorl %%edx, %%edx                \n"
        "movl %1, %%eax                   \n"

        : "=a" (result)
        : "m" (a),
          "m" (b)
        : "ecx", "edx"
    );

    return result;
}

static int test2()
{
    int a='a', b='b', result;

    __asm__ __volatile__(
        "pushl %%ecx                      \n"
        "xorl %%ecx, %%ecx                \n"
        "xorl %%edx, %%edx                \n"
        "movl %1, %%eax                   \n"
        "popl %%ecx                       \n"
        : "=a" (result)
        : "m" (a),
          "m" (b)
        : "ecx", "edx"
    );

    return result;
}

int main(void)
{
    printf("test1: a='%c'\n", test1());
    printf("test2: a='%c'\n", test2());
}