https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77399
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2016-08-30 Component|middle-end |tree-optimization Summary|Fails to use native |SLP does not handle |instructions for vector |BIT_FIELD_REF or |casts |CONSTRUCTOR Ever confirmed|0 |1 Severity|normal |enhancement --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Confirmed. One extra case: typedef int v4si __attribute__((vector_size(16))); typedef float v4sf __attribute__((vector_size(16))); v4sf vec_cast1(int *f) { return (v4sf){f[0], f[1], f[2], f[3]}; } In this case, the CONSTRUCTOR is the "store"