[Bug target/37010] -mno-accumulate-outgoing-args doesn't work with stack alignment

[Joey dot ye at intel dot com]

------- Comment #7 from Joey dot ye at intel dot com  2008-08-04 09:03 -------
This problem is associated with -mpreferred-stack-boundary=2, rather than with
stack alignment. Following case fails on trunk before merging with stack
branch:
$ cat y1.c
/* PR middle-end/37010 */
/* { dg-do run { target { { i?86-*-* x86_64-*-* } && ilp32 } } } */
/* { dg-options "-msse2" } */

typedef __PTRDIFF_TYPE__ ptrdiff_t;
extern void abort (void);

int
__attribute__ ((noinline))
check (void *i, int align)
{
  if ((((ptrdiff_t) i) & (align - 1)) != 0)
    {
      abort ();
    }
  return 0;
}
typedef float __m128 __attribute__ ((__vector_size__ (16), __may_alias__));

void
__attribute__ ((noinline))
foo (__m128 x, __m128 y ,__m128 z ,__m128 a, int size)
{
  check(&a, __alignof__(a));
}

int
main (void)
{
  __m128 x = { 1.0 };
  foo (x, x, x, x, 5);
  return 0;
}

$ gcc -v
Using built-in specs.
Target: x86_64-unknown-linux-gnu
Configured with: ../src/configure --disable-bootstrap
--enable-languages=c,c++,fortran --enable-checking=assert
Thread model: posix
gcc version 4.4.0 20080707 (experimental) [trunk revision 137572] (GCC) 
$ gcc  -o y1.exe y1.c -m32 -Os -msse2 -mpreferred-stack-boundary=2
$ ./y.exe
Aborted


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37010