From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 68D58385DC35; Mon, 18 May 2020 08:41:45 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 68D58385DC35 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1589791305; bh=MKxnFxtZpBn7nYguuJftRscMWp8gKjJECCykxHcxwqc=; h=From:To:Subject:Date:In-Reply-To:References:From; b=Ok/09/JgqbDDc1XYPR8NdmOwayvpirF4mH2OTPc2DTRdhBsuSk02XqgTKHsUIqfoo xYvCkvM8s9hzoGG4JAKUQkJfwkoTwJ0eTqeoLgUEKv4m/CK/DgrbivyuQUBlT1GgC/ 0JxRMb9bpS7TDcK3K4Tf+g3fn26BSXNhX13krhLQ= From: "crazylht at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/94962] Suboptimal AVX2 code for _mm256_zextsi128_si256(_mm_set1_epi8(-1)) Date: Mon, 18 May 2020 08:41:45 +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: 10.0 X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: normal X-Bugzilla-Who: crazylht at gmail dot com X-Bugzilla-Status: UNCONFIRMED 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: cc 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 X-BeenThere: gcc-bugs@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-bugs mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 18 May 2020 08:41:45 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94962 Hongtao.liu changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |crazylht at gmail dot com --- Comment #1 from Hongtao.liu --- redudant vmovdaq xmm0, xmm0 is generated by=20 ---- (insn:TI 7 6 14 2 (set (reg:V8SI 20 xmm0 [84]) (vec_concat:V8SI (reg:V4SI 20 xmm0 [86]) (const_vector:V4SI [ (const_int 0 [0]) repeated x4 ]))) "/export/users2/liuhongt/install/gcc10_trunk/lib/gcc/x86_64-pc-linux-gnu/10= .0.1/include/avxintrin.h":770:20 5296 {avx_vec_concatv8si} (expr_list:REG_EQUIV (const_vector:V8SI [ (const_int -1 [0xffffffffffffffff]) repeated x4 (const_int 0 [0]) repeated x4 ]) (nil))) ----- could be eliminated if src operand has same regno as dest operand. --- diff --git a/gcc/config/i386/sse.md b/gcc/config/i386/sse.md index 7a7ecd4be87..4ff4cf55f74 100644 --- a/gcc/config/i386/sse.md +++ b/gcc/config/i386/sse.md @@ -21123,6 +21123,9 @@ } case 2: case 3: + if (register_operand (operands[1], MODE) + && REGNO (operands[1]) =3D=3D REGNO (operand[0])) + return ""; switch (get_attr_mode (insn)) { case MODE_V16SF: ---=