https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114544
--- Comment #1 from Hongtao Liu <liuhongt at gcc dot gnu.org> ---
20590;; Turn SImode or DImode extraction from arbitrary SSE/AVX/AVX512F
20591;; vector modes into vec_extract*.
20592(define_split
20593 [(set (match_operand:SWI48x 0 "nonimmediate_operand")
20594 (subreg:SWI48x (match_operand 1 "register_operand") 0))]
20595 "can_create_pseudo_p ()
20596 && REG_P (operands[1])
20597 && VECTOR_MODE_P (GET_MODE (operands[1]))
20598 && ((TARGET_SSE && GET_MODE_SIZE (GET_MODE (operands[1])) == 16)
20599 || (TARGET_AVX && GET_MODE_SIZE (GET_MODE (operands[1])) == 32)
20600 || (TARGET_AVX512F && TARGET_EVEX512
20601 && GET_MODE_SIZE (GET_MODE (operands[1])) == 64))
20602 && (<MODE>mode == SImode || TARGET_64BIT || MEM_P (operands[0]))"
20603 [(set (match_dup 0) (vec_select:SWI48x (match_dup 1)
20604 (parallel [(const_int 0)])))]
20605{
20606 rtx tmp;
We need to do something similar.
