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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/98694] [11 Regression] GCC produces incorrect code for
 loops with -O3 for skylake-avx512 and icelake-server
Date: Fri, 15 Jan 2021 17:22:10 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98694

--- Comment #5 from Hongtao.liu <crazylht at gmail dot com> ---
and rewritten pattern
(define_insn "*vec_dupv4hi"
  [(set (match_operand:V4HI 0 "register_operand" "=3Dy,xYw")
        (vec_duplicate:V4HI
          (truncate:HI
            (match_operand:SI 1 "register_operand" "0,xYw"))))]
to=20

(define_insn "*vec_dupv4hi"
  [(set (match_operand:V4HI 0 "register_operand" "=3Dy,xYw")
        (vec_duplicate:V4HI
          (vecTselect:HI
            (match_operand:V4HI 1 "register_operand" "0,xYw")
            (parallel [(const_int 0)]))))]

could avoid this issue.=