/* PR tree-optimization/27285 */extern void abort (void);struct S { unsigned char a, b, c, d[16]; };void __attribute__ ((noinline))foo (struct S *x, struct S *y){  int a, b;  unsigned char c, *d, *e;  b = x->b;  d = x->d;  e = y->d;  a = 0;  while (b)    {      if (b >= 8)	{	  c = 0xff;	  b -= 8;	}      else	{	  c = 0xff << (8 - b);	  b = 0;	}      e[a] = d[a] & c;      a++;    }}intmain (void){  struct S x = { 0, 25, 0, { 0xaa, 0xbb, 0xcc, 0xdd }};  struct S y = { 0, 0, 0, { 0 }};  foo (&x, &y);  if (x.d[0] != y.d[0] || x.d[1] != y.d[1]      || x.d[2] != y.d[2] || (x.d[3] & 0x80) != y.d[3])    abort ();   return 0;}