https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53101
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Target Milestone|--- |8.0
Status|NEW |RESOLVED
--- Comment #8 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
GCC 5+ just produces a stack increment/decrement but no stores (unlike 4.9.x).
GCC 6+ is able to remove the stack increment/decrement.
GCC 7+ uses BIT_FIELD_REF on the gimple level.
GCC 8+ expands the BIT_FIELD_REF to use vec_select directly and get:
(insn 6 5 7 (set (reg:TI 90)
(vec_select:TI (subreg:V2TI (reg/v:V4DF 88 [ x ]) 0)
(parallel [
(const_int 0 [0])
]))) "/app/example.cpp":9 -1
(nil))
So this is fully fixed for GCC 8+ with incremental steps along the way.
