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 X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 01B12C49EA6 for ; Sat, 26 Jun 2021 05:08:07 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B6CAC6192F for ; Sat, 26 Jun 2021 05:08:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B6CAC6192F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linaro.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:56690 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lx0Y1-0003Xh-U7 for qemu-devel@archiver.kernel.org; Sat, 26 Jun 2021 01:08:05 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:45198) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lx0TQ-000746-FH for qemu-devel@nongnu.org; Sat, 26 Jun 2021 01:03:20 -0400 Received: from mail-pf1-x436.google.com ([2607:f8b0:4864:20::436]:38639) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1lx0TN-0008IL-32 for qemu-devel@nongnu.org; Sat, 26 Jun 2021 01:03:20 -0400 Received: by mail-pf1-x436.google.com with SMTP id c8so9140217pfp.5 for ; Fri, 25 Jun 2021 22:03:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=lhsY62Axz8P4uEG2iGxE1nxCZRsB4mKyTgfXOvjyYjw=; b=a/00AzyrKg2sXXifK8rvABidCYpujudF5re+4qmV15W1VkOlaLx9Ipu9IMkEWbpkQ8 somlR2OMZ+QuIr5L/wj/keWRucCNB3S5GqdvxH9SbDoXVQT20m24xyxYbvFs/EHzbUgb u1k8anGncFjHG9AwrW6otl10CohibYn6JlPqeLnyDvHbt7RNURQQKWIsxbx3kA2oyE5N /x/iT1cXlNzjIQVL8iI+d0Y5wf/FfOkHHj6+xyN6iUXbtUzy6Dv2f1NWiyGXVglbx0Tr UdeKdUF2jdyPYW6T/zswPtwIFWeN3FQQ1iTSO5JtsJPZ9/Nh/dITHpMvQP/FH9RQ/C37 /4Fg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=lhsY62Axz8P4uEG2iGxE1nxCZRsB4mKyTgfXOvjyYjw=; b=RDd9M0cFwVMFmkY1j51vipRygHOyvGcxFjm/xxUw97EZvmQFGF4l88ISkqwQqFG9FY kT2p01M86aIXpRCeKLph2uuNTx+26SY6yUgrwaFVyvw7+uIFe+P8eSmxiNwnTDgB1Nn1 KzjAEjrjJL/oBLCbz53Hc24j3WD94RHPSusg3l0XNUl2jIcW4uT0R6pMvDESNhUkdaMc CbtxsbbIhleqZGZO0k7vYPyRFLRN+f6pZNg5B7aGeb9KlokNw54Vnhz6nLEFQYUWcT+T 7KfQuJAdFHE3t/ovkBD2bpdzyeVLO87rpg5k3ElTuKP+pTSvxfNvOBtJV8JcGALJ6IqH lUzg== X-Gm-Message-State: AOAM531jYfZaxsDCKbQWFhkMZ8rZxkDj17uCTbhpXXWZxFPcaZnXHXAy 4bvAU/ClPbxrBrB676sCIhz2c9b3LAeUUw== X-Google-Smtp-Source: ABdhPJx/V5z+hGU3VJb6QfYdsSt/1YtfWEaKtZocbli5yP/NSZdqcbSlNPwxXTj2EayAL0YOmKviiA== X-Received: by 2002:a63:312:: with SMTP id 18mr12892136pgd.33.1624683795797; Fri, 25 Jun 2021 22:03:15 -0700 (PDT) Received: from localhost.localdomain ([71.212.149.176]) by smtp.gmail.com with ESMTPSA id c62sm7389768pfa.12.2021.06.25.22.03.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 25 Jun 2021 22:03:15 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH v4 13/16] tcg: Expand usadd/ussub with umin/umax Date: Fri, 25 Jun 2021 22:03:04 -0700 Message-Id: <20210626050307.2408505-14-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210626050307.2408505-1-richard.henderson@linaro.org> References: <20210626050307.2408505-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::436; envelope-from=richard.henderson@linaro.org; helo=mail-pf1-x436.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, 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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: david@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" For usadd, we only have to consider overflow. Since ~B + B == -1, the maximum value for A that saturates is ~B. For ussub, we only have to consider underflow. The minimum value that saturates to 0 from A - B is B. Signed-off-by: Richard Henderson --- tcg/tcg-op-vec.c | 37 +++++++++++++++++++++++++++++++++++-- 1 file changed, 35 insertions(+), 2 deletions(-) diff --git a/tcg/tcg-op-vec.c b/tcg/tcg-op-vec.c index 15e026ae49..7705a49c0b 100644 --- a/tcg/tcg-op-vec.c +++ b/tcg/tcg-op-vec.c @@ -119,6 +119,18 @@ bool tcg_can_emit_vecop_list(const TCGOpcode *list, continue; } break; + case INDEX_op_usadd_vec: + if (tcg_can_emit_vec_op(INDEX_op_umin_vec, type, vece) || + tcg_can_emit_vec_op(INDEX_op_cmp_vec, type, vece)) { + continue; + } + break; + case INDEX_op_ussub_vec: + if (tcg_can_emit_vec_op(INDEX_op_umax_vec, type, vece) || + tcg_can_emit_vec_op(INDEX_op_cmp_vec, type, vece)) { + continue; + } + break; case INDEX_op_cmpsel_vec: case INDEX_op_smin_vec: case INDEX_op_smax_vec: @@ -603,7 +615,18 @@ void tcg_gen_ssadd_vec(unsigned vece, TCGv_vec r, TCGv_vec a, TCGv_vec b) void tcg_gen_usadd_vec(unsigned vece, TCGv_vec r, TCGv_vec a, TCGv_vec b) { - do_op3_nofail(vece, r, a, b, INDEX_op_usadd_vec); + if (!do_op3(vece, r, a, b, INDEX_op_usadd_vec)) { + const TCGOpcode *hold_list = tcg_swap_vecop_list(NULL); + TCGv_vec t = tcg_temp_new_vec_matching(r); + + /* usadd(a, b) = min(a, ~b) + b */ + tcg_gen_not_vec(vece, t, b); + tcg_gen_umin_vec(vece, t, t, a); + tcg_gen_add_vec(vece, r, r, b); + + tcg_temp_free_vec(t); + tcg_swap_vecop_list(hold_list); + } } void tcg_gen_sssub_vec(unsigned vece, TCGv_vec r, TCGv_vec a, TCGv_vec b) @@ -613,7 +636,17 @@ void tcg_gen_sssub_vec(unsigned vece, TCGv_vec r, TCGv_vec a, TCGv_vec b) void tcg_gen_ussub_vec(unsigned vece, TCGv_vec r, TCGv_vec a, TCGv_vec b) { - do_op3_nofail(vece, r, a, b, INDEX_op_ussub_vec); + if (!do_op3(vece, r, a, b, INDEX_op_ussub_vec)) { + const TCGOpcode *hold_list = tcg_swap_vecop_list(NULL); + TCGv_vec t = tcg_temp_new_vec_matching(r); + + /* ussub(a, b) = max(a, b) - b */ + tcg_gen_umax_vec(vece, t, a, b); + tcg_gen_sub_vec(vece, r, t, b); + + tcg_temp_free_vec(t); + tcg_swap_vecop_list(hold_list); + } } static void do_minmax(unsigned vece, TCGv_vec r, TCGv_vec a, -- 2.25.1