https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99689
--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> --- GCC 9.3.0 says: /app/example.cpp:19:18: missed: can't use a fully-masked loop because the target doesn't have the appropriate masked load or store. /app/example.cpp:19:18: note: vect_model_load_cost: aligned. /app/example.cpp:19:18: note: vect_model_load_cost: inside_cost = 2, prologue_cost = 0 . /app/example.cpp:19:18: note: ==> examining statement: _2 = (unsigned int) _24; /app/example.cpp:19:18: note: vect_is_simple_use: operand # VUSE <.MEM_12> MEM[(long unsigned intD.17 *)SR.139_80 + 8B], type of def: internal ... But GCC 9.4.0 says: /app/example.cpp:19:18: missed: not falling back to elementwise accesses /app/example.cpp:20:49: missed: not vectorized: relevant stmt not supported: _24 = MEM[(long unsigned int *)SR.139_80 + 8B]; /app/example.cpp:19:18: missed: bad operation or unsupported loop bound. /app/example.cpp:19:18: missed: couldn't vectorize loop /app/example.cpp:20:49: missed: not vectorized: relevant stmt not supported: _24 = MEM[(long unsigned int *)SR.139_80 + 8B]; /app/example.cpp:9:1: note: vectorized 0 loops in function.
