From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 81C203858D28; Mon, 12 Jun 2023 02:17:21 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 81C203858D28 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1686536241; bh=vlqLSRextZt0yYYTnV44cz77/Cw2G5PJQ2mKBcA7lcw=; h=From:To:Subject:Date:In-Reply-To:References:From; b=aLB3Ody2bl4SpqIsvXXl2bUe1tuxmOHWGGJhyqHgd6y5jmHkecv13519deU4O+7yt v7fK1xbXRY8Ug4EnNK1mrSurkygM+KAHvDclSEKK9FCC0KZcGG2OeXZF4XsceBK5fu vfEMWvcK4NnH+Kx5BMVQl5qtpEUGJCWWCRXCjgT8= From: "crazylht at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/110170] Sub-optimal conditional jumps in conditional-swap with floating point Date: Mon, 12 Jun 2023 02:17:19 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: target X-Bugzilla-Version: 14.0 X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: normal X-Bugzilla-Who: crazylht at gmail dot com X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 List-Id: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110170 --- Comment #8 from Hongtao.liu --- ix86_expand_sse_fp_minmax failed since rtx_equal_p (cmp_op0, if_true) is fa= lse,=20 249(reg:DF 86 [ _1 ]) (if_true) 250(reg:DF 83 [ _2 ]) (if_false) 251(reg:DF 82 [ _1 ]) (cmp0_op0) 252(reg:DF 83 [ _2 ]) (cmp1_op1) but here if_true is just a copy from cmp_op0 but with different REGNO, rtx_equal_p seems too conservative here. 85(code_label 26 13 17 3 4 (nil) [1 uses]) 86(note 17 26 5 3 [bb 3] NOTE_INSN_BASIC_BLOCK) 87(insn 5 17 6 3 (set (reg:DF 86 [ _1 ]) 88 (reg:DF 82 [ _1 ])) "test.C":3:20 153 {*movdf_internal} 89 (expr_list:REG_DEAD (reg:DF 82 [ _1 ]) 90 (nil))) 91(insn 6 5 7 3 (set (reg:DF 82 [ _1 ]) 92 (reg:DF 83 [ _2 ])) "test.C":4:14 discrim 1 153 {*movdf_internal} 93 (expr_list:REG_DEAD (reg:DF 83 [ _2 ]) 94 (nil))) 95(insn 7 6 18 3 (set (reg:DF 83 [ _2 ]) 96 (reg:DF 86 [ _1 ])) "test.C":3:20 discrim 1 153 {*movdf_internal} 97 (expr_list:REG_DEAD (reg:DF 86 [ _1 ]) 98 (nil))) 3812 if (rtx_equal_p (cmp_op0, if_true) && rtx_equal_p (cmp_op1, if_false)) 3813 is_min =3D true; 3814 else if (rtx_equal_p (cmp_op1, if_true) && rtx_equal_p (cmp_op0, if_false)) 3815 is_min =3D false; 3816 else 3817=3D> return false;=