https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95218
--- Comment #11 from Richard Biener <rguenth at gcc dot gnu.org> ---
Note a 'use' is not something that needs to be preserved, so
(define_insn_and_split "*<code><mode>2"
[(set (match_operand:VF 0 "register_operand" "=x,v")
(absneg:VF
(match_operand:VF 1 "vector_operand" "%0,v")))
(use (match_operand:VF 2 "vector_operand" "xBm,vm"))]
"TARGET_SSE"
"#"
"&& reload_completed"
[(set (match_dup 0)
(<absneg_op>:VF (match_dup 1) (match_dup 2)))]
""
[(set_attr "isa" "noavx,avx")])
doesn't make much sense (before reload). To me, that is. Why do
we go that obfuscated way at all? I think a clean solution is to
use an UNSPEC here (well, "clean"...).
