From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 00548CD8C88 for ; Sun, 7 Jun 2026 14:05:35 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists1p.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1wWE6v-0004M9-Jf; Sun, 07 Jun 2026 10:04:21 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1wWE6u-0004M0-Er for qemu-devel@nongnu.org; Sun, 07 Jun 2026 10:04:20 -0400 Received: from sea.source.kernel.org ([172.234.252.31]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1wWE6s-00086t-VD for qemu-devel@nongnu.org; Sun, 07 Jun 2026 10:04:20 -0400 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 0917843688; Sun, 7 Jun 2026 14:04:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 21C2E1F00893; Sun, 7 Jun 2026 14:04:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1780841057; bh=jX18zqXFA+LNSDjlxcNAVPph0zpvwfV3CNTKM9znobo=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=BCP9ldpq/Cad+rp8Dys2X92OYmtVQsR+21UTrdZLs9JGKe1TSkajp0OI2duEzQBto aRjmFUfoz5U51F14flmvVq3Mlw/71vYIqCNzPPnRVCA20CQg90617g2fw58b5nA3Jh tI6tc6U8foDWaE8xZmwymvhhInngFC6OP7I7bMb8vPe6679feNsqYBhCrjN7OueIwS GoAnriW3odiCTbSpoY8MCDxTgQDhfdrQ2tzVysUc6BEOW7EHmA/f9cd2AASfOwC2cb ScbN5MCuDJVp+qJVx0g2MD6crj2T+sgZjLIscdx40wTT0honNbKh7EXD2m18UBiAiT 6Y2WSE9wrK19w== From: Helge Deller To: qemu-devel@nongnu.org Cc: Pierrick Bouvier , Laurent Vivier , Yoshinori Sato , Max Filippov , Helge Deller , Matt Turner , Richard Henderson Subject: [PATCH 08/10] target/sh4: decode_gusa: recognize add#imm with prior mov Rm, Rn Date: Sun, 7 Jun 2026 16:03:54 +0200 Message-ID: <20260607140356.10702-9-deller@kernel.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260607140356.10702-1-deller@kernel.org> References: <20260607140356.10702-1-deller@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=172.234.252.31; envelope-from=deller@kernel.org; helo=sea.source.kernel.org X-Spam_score_int: -24 X-Spam_score: -2.5 X-Spam_bar: -- X-Spam_report: (-2.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.445, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Matt Turner The gUSA pattern matcher rejected `add #imm, Rn` whenever any prior `mov Rm, Rn` appeared (mv_src >= 0), forcing a fallback to cpu_exec_step_atomic for sequences like: mov.l @r2, r3 ; load mov r3, r7 ; save old value (mv_src == ld_dst) add #1, r7 ; increment copy mov.l r7, @r2 ; store When mv_src == ld_dst the move merely copies the loaded value to preserve it -- exactly the situation already accepted for the `add Rm, Rn` form. The immediate form can be handled identically with tcg_gen_atomic_fetch_add_i32 + tcg_gen_add_i32, so translate it inline instead of taking the slower single-step atomic fallback. Signed-off-by: Matt Turner Cc: Yoshinori Sato Cc: Richard Henderson Signed-off-by: Helge Deller --- target/sh4/translate.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/target/sh4/translate.c b/target/sh4/translate.c index 5adf650744..d38a6bd352 100644 --- a/target/sh4/translate.c +++ b/target/sh4/translate.c @@ -1974,7 +1974,7 @@ static void decode_gusa(DisasContext *ctx, CPUSH4State *env) break; case 0x7000 ... 0x700f: /* add #imm,Rn */ - if (op_dst != B11_8 || mv_src >= 0) { + if (op_dst != B11_8 || (mv_src >= 0 && mv_src != ld_dst)) { goto fail; } op_opc = INDEX_op_add; -- 2.54.0