From nobody Tue Feb 10 11:15:26 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1770066174230499.05461112379874; Mon, 2 Feb 2026 13:02:54 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vn13L-000222-Ok; Mon, 02 Feb 2026 16:01:48 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vn12Z-0000eQ-8D; Mon, 02 Feb 2026 16:01:07 -0500 Received: from isrv.corpit.ru ([212.248.84.144]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vn12V-0004K2-Ri; Mon, 02 Feb 2026 16:00:57 -0500 Received: from tsrv.corpit.ru (tsrv.tls.msk.ru [192.168.177.2]) by isrv.corpit.ru (Postfix) with ESMTP id C277E1851A7; Mon, 02 Feb 2026 23:57:53 +0300 (MSK) Received: from think4mjt.tls.msk.ru (mjtthink.wg.tls.msk.ru [192.168.177.146]) by tsrv.corpit.ru (Postfix) with ESMTP id 8BE7835B31E; Mon, 02 Feb 2026 23:58:35 +0300 (MSK) From: Michael Tokarev To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org, Paolo Bonzini , Richard Henderson , Michael Tokarev Subject: [Stable-10.1.4 27/74] tcg/optimize: Do use affected bits Date: Mon, 2 Feb 2026 23:57:38 +0300 Message-ID: <20260202205833.941615-27-mjt@tls.msk.ru> X-Mailer: git-send-email 2.47.3 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=212.248.84.144; envelope-from=mjt@tls.msk.ru; helo=isrv.corpit.ru X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZM-MESSAGEID: 1770066174683154100 Content-Type: text/plain; charset="utf-8" From: Paolo Bonzini We inadvertently disabled affected bits optimizations on operations that use fold_masks_zosa. These happen relatively often in x86 code for extract/sextract; for example given the following: mov %esi, %ebp xor $0x1, %ebp the optimizer is able to simplify the "extract_i64 rbp,tmp0,$0x0,$0x20" produced by the second instruction to a move. Cc: qemu-stable@nongnu.org Fixes: 932522a9ddc ("tcg/optimize: Fold and to extract during optimize") Signed-off-by: Paolo Bonzini Reviewed-by: Richard Henderson Signed-off-by: Richard Henderson Message-ID: <20251223163720.985578-1-pbonzini@redhat.com> (cherry picked from commit 23b53ec3a8a279cb5acd5e022b464a4272fe9f8c) Signed-off-by: Michael Tokarev diff --git a/tcg/optimize.c b/tcg/optimize.c index db1d89396b..5ae26e4a10 100644 --- a/tcg/optimize.c +++ b/tcg/optimize.c @@ -1103,7 +1103,7 @@ static bool fold_masks_zosa_int(OptContext *ctx, TCGO= p *op, static bool fold_masks_zosa(OptContext *ctx, TCGOp *op, uint64_t z_mask, uint64_t o_mask, int64_t s_mask, uint64_t a_ma= sk) { - fold_masks_zosa_int(ctx, op, z_mask, o_mask, s_mask, -1); + fold_masks_zosa_int(ctx, op, z_mask, o_mask, s_mask, a_mask); return true; } =20 --=20 2.47.3