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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/97950] Unoptimal code generation with
 __builtin_*_overflow{,_p} for short and __int128
Date: Mon, 23 Nov 2020 20:26:52 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97950

--- Comment #3 from Uro=C5=A1 Bizjak <ubizjak at gmail dot com> ---
Comment on attachment 49613
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D49613
gcc11-pr97950.patch

>+(define_insn_and_split "*setcc_hi_1"
>+  [(set (match_operand:HI 0 "register_operand" "=3Dq")
>+	(match_operator:HI 1 "ix86_comparison_operator"
>+	  [(reg FLAGS_REG) (const_int 0)]))]
>+  "!TARGET_PARTIAL_REG_STALL"
>+  "#"
>+  "&& reload_completed"
>+  [(set (match_dup 2) (match_dup 1))
>+   (set (match_dup 0) (zero_extend:DI (match_dup 2)))]

zero_extend:HI

Perhaps you could apply SWI24 mode iterator to existing *setcc_si_1_and and
*setcc_si_1_movzbl?=