https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96654
--- Comment #2 from Marc Glisse <glisse at gcc dot gnu.org> --- gcc doesn't seem very fond of using 2 different vector bitsizes at the same time, so VEC_PACK_FIX_TRUNC_EXPR takes 2 vectors of 2 double and gives one vector of 4 int. At the RTL level, we have a vec_concat:V4DF of 2 V2DF adjacent in memory, but nothing knows to turn that into a single load. (the conversion itself of 4 double to int is fine)
