[cfe-dev] Issue with designated initializers and vectors

[Mattias Holm]

Eli Friedman wrote:
> 
> Thanks for the report; fixed in r73292.
> 
> -Eli

Thanks works fine now :)

Here is another one, the parser and sema works fine in this case but the 
code generator does something wrong I think. The following program 
segfaults when built with clang (tested on darwin x86 both 32 and 64 bit 
targets), but works fine with GCC.

It crashes on the line p.v[0] = a->v[0] * v.v;


typedef float __attribute__((vector_size (16))) v4f_t;

typedef union {
     float a[4];
     struct {
         float x, y, z, w;
     }s;
     v4f_t v;
} vector_t;

typedef union {
     float a[4][4];
     v4f_t v[4];
} matrix_t;

vector_t
foo(const matrix_t *a, const vector_t v)
{
   vector_t vr;
   matrix_t p;
   p.v[0] = a->v[0] * v.v;

   vr.v = p.v[0];

   return vr;
}

int
main(int argc, char **argv)
{
   matrix_t m;
   for (int i = 0 ; i < 4; i ++) {
     for (int j = 0 ; j < 4; j ++) {
       m.a[i][j] = 1.0;
     }
   }
   vector_t v = {.a = {1.0, 1.0, 1.0, 1.0}};

   vector_t r = foo(&m, v);

   return 0;
}

/ Mattias