https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87555
Bug ID: 87555
Summary: There is no need for UNSPEC_FMADDSUB
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: hjl.tools at gmail dot com
Target Milestone: ---
Target: i386,x86-64
sse.md has
;; It would be possible to represent these without the UNSPEC as
;;
;; (vec_merge
;; (fma op1 op2 op3)
;; (fma op1 op2 (neg op3))
;; (merge-const))
;;
;; But this doesn't seem useful in practice.
(define_expand "fmaddsub_<mode>"
[(set (match_operand:VF 0 "register_operand")
(unspec:VF
[(match_operand:VF 1 "nonimmediate_operand")
(match_operand:VF 2 "nonimmediate_operand")
(match_operand:VF 3 "nonimmediate_operand")]
UNSPEC_FMADDSUB))]
"TARGET_FMA || TARGET_FMA4 || TARGET_AVX512F")
There is no need for UNSPEC_FMADDSUB.
