gnu/dist/gcc4/gcc/testsuite/gcc.dg/vmx/gcc-bug-i.c

   1 #include "harness.h"
   2
   3 /* This problem occurs if a function is inlined.  When its local
   4    variables get allocated space on the caller's (the function to
   5    which it is inlined) stack frame, they don't get 16-byte alignment
   6    even if they need it.  Here's an example with a union (that's the
   7    first case I uncovered, but it's probably a general occurrence on
   8    inlining).  */
   9
  10 #define N 10
  11 /* adjust N = size of buffer to try to get bad alignment for inlined union */
  12
  13 #define DO_INLINE __attribute__ ((always_inline))
  14 #define DONT_INLINE __attribute__ ((noinline))
  15
  16 static DO_INLINE int inline_me(vector signed short data)
  17 {
  18   union {vector signed short v; signed short s[8];} u;
  19   u.v = data;
  20   return u.s[7];
  21 }
  22
  23 static DONT_INLINE int foo(vector signed short data)
  24 {
  25   int c, buffer[N], i;
  26   c = inline_me(data);
  27   for (i=0; i<N; i++) {
  28     if (i == 0)
  29       buffer[i] = c;
  30     else
  31       buffer[i] = buffer[i-1] + c*i;
  32   }
  33   return buffer[N-1];
  34 }
  35
  36 static void test()
  37 {
  38   check(foo((vector signed short)
  39             ((vector unsigned char){1,2,3,4,5,6,7,8,
  40                                    9,10,11,12,13,14,15,16})) == 0x2b4e0,
  41         "foo");
  42 }