[Bug target/84760] Finish implementation of __builtin_altivec_lvx_v1ti

[kelvin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84760

--- Comment #2 from kelvin at gcc dot gnu.org ---
I don't argue either way on this, but it looks to me like we do not currently
have support for __int128 with vec_ld.

1. I can't fine it in the rs6000-c tables.

2. This test fails to compile:

#include <stdio.h>
#include <altivec.h>

static vector unsigned char uc;
static vector __int128 v;
static vector __int128 *pi;

void
doInitialization ()
{
  v[0] = -1;
  pi = &v;
}

int
main (int argc, char *argv)
{
  __int128 entry;
  int i;

  /* Apparent usage:                                                            
   *  <Type> result = vec_ld (int index, vector<Type> v)                        
   * is equivalent to:                                                          
   *  result = v [index];                                                       
   */
  doInitialization ();
  entry = vec_ld (0, pi);
  i = (int) entry;
  printf ("result of vec_ld is %d\n", i);
  return 0;
}

$GCC_BUILD/gcc/xgcc -B$GCC_BUILD/gcc/ -O1 -o kelvin-1 kelvin-1.c
kelvin-1.c: In function ‘main’:
kelvin-1.c:36:3: error: invalid parameter combination for AltiVec intrinsic
‘__builtin_vec_ld’
   entry = vec_ld (0, pi);
   ^~~~~
Makefile:26: recipe for target 'kelvin-1' failed
make: *** [kelvin-1] Error 1


By the way, it's probably obvious everyone else what vec_ld is supposed to do,
but it's not documented anywhere that I can find...