[Bug rtl-optimization/41833] New: vec_splat followed by vec_splat could be improved

["pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

Take:
#include <altivec.h>

vector float f(vector float a)
{
  vector float b = vec_splat (a, 2);
  return vec_splat (b, 0);
}
--- CUT ---
The second vec_splat could be removed as we already splatted the value across
the vector once, there is no need to do it again.


-- 
           Summary: vec_splat followed by vec_splat could be improved
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P3
         Component: rtl-optimization
        AssignedTo: pinskia at gcc dot gnu dot org
        ReportedBy: pinskia at gcc dot gnu dot org
GCC target triplet: powerpc*-*-*


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41833