[Bug middle-end/12210] Bug in `expand_builtin_apply'(possibly in `allocate_dynamic_stack_space')

["waspcoder at mail dot ru" <gcc-bugzilla at gcc dot gnu dot org>]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12210



------- Additional Comments From waspcoder at mail dot ru  2003-09-08 15:03 -------
 BUGREPORT
 Ossadchy Yury A., waspcoder@mail.ru
 GCC 3.3.1 fails on test
--- CODE ---
#include <stdio.h>

__attribute__ ((regparm (0))) int fn1 (int arg1, int arg2)
{
    printf ("fn1 (%i, %i)\n", arg1, arg2);
    return -20;
}

__attribute__ ((regparm (0))) int caller (int arg1, int arg2)
{
    void * args = __builtin_apply_args ();

    printf ("caller (%i, %i)\n", arg1, arg2);
    __builtin_return (__builtin_apply ((void (*)())&fn1, args, sizeof (int)*2));
							    // ^^^^^^^^^^^^^^
							    // it's bad, but it must work!
							    // regparm (0)!
}

int main ()
{
    printf ("result == %i\n", caller (10, 34));
}
--- /CODE ---

gcc-2.96:
>caller (10, 34)
>fn1 (10, 34)
>result == -20
    
gcc-3.3.1:
>caller (10, 34)
>fn1 (1074217344, 1075033152)
>result == -20

gcc -v:
>Reading specs from /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.3.1/specs
>Configured with: ../gcc-3.3.1/configure --enable-languages=c objc++
>Thread model: posix
>gcc version 3.3.1

NOTE: include somewhat like my test into `testsuite'!

Problem is in `builtins.c::expand_builtin_apply', when pushing parameters.
Simplest `bugfix':
  /* WASP: dest = allocate_dynamic_stack_space (argsize, 0, BITS_PER_UNIT);
           does NOT works, use this:  */
  dest = push_block (argsize, 0, 1);