Message ID | 20230520162634.3991009-26-richard.henderson@linaro.org (mailing list archive) |
---|---|
State | New, archived |
Headers | show
Return-Path: <qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org> X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 14637C77B7A for <qemu-devel@archiver.kernel.org>; Sat, 20 May 2023 16:30:00 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from <qemu-devel-bounces@nongnu.org>) id 1q0PQm-0004Jw-9w; Sat, 20 May 2023 12:27:44 -0400 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 <richard.henderson@linaro.org>) id 1q0PQJ-0003nB-DK for qemu-devel@nongnu.org; Sat, 20 May 2023 12:27:15 -0400 Received: from mail-pl1-x62c.google.com ([2607:f8b0:4864:20::62c]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from <richard.henderson@linaro.org>) id 1q0PQE-000392-GP for qemu-devel@nongnu.org; Sat, 20 May 2023 12:27:15 -0400 Received: by mail-pl1-x62c.google.com with SMTP id d9443c01a7336-1ae615d5018so26547555ad.1 for <qemu-devel@nongnu.org>; Sat, 20 May 2023 09:27:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1684600028; x=1687192028; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=6WXDf+ZM8xKRR3ok9Sko5lUMigoP5WIzPelyBaHT6/A=; b=wUixfCHPzv4t4m33BQzAwn58Cw6b65/96GrMJuwsDRylO2TW2hHfkgTZ8tQRBQzjLm R9jz4khe9Z7XEeKDn74C0wmfSdws6D0fQI8ndPID73egkLFouW93b0zyR8JznVC31VUU 5eraGvW+1QVoNH+qESq0SamQ+hBHtM0Qzj6CMWnAP7/hInANMJM1l9V7AYCGPa9PyR4w k8LGYAMc+NJ96JJqo1pgCTVan/4718W7NCoXp87u31H/9xCox2C27GkejHfG4pafDEg4 WISn/G16TgYlSHV4ls9FkgcEQ/jgN+35XBqMqURyWdvMHgu+spf7dy0v8ZWQ6ODpZ7GW JHgA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1684600028; x=1687192028; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=6WXDf+ZM8xKRR3ok9Sko5lUMigoP5WIzPelyBaHT6/A=; b=PaAqZ9J8iRHM0lq+N2/X+xgLqfp7ZFEdAyX72VshZb3qVh0Ne9F7WTlp5AzazpX1BF i7mBY5LexqOSDjUbNTT3R/F3tnmms8K6lCrVpc/IJ14Kq6TzFE9H1abu7QbFCXP/rGDS NxeWaXlH63iegY49KQ6chf+jUr75ggWAsZl3BJw8SZyRKTWYvJKg/F7PuE+rz0x4GgIM wSXLGzuMUa86pDZfmYKclD8tngG8oZgICjdHL2A5FjLzmuQnuV5MHfLCurHarZi8Y/Dj p41scgWkwPIzw2t4yTYL8IjtmFbJjzbjaRW/xCNfBPr8jJZc4YnZ4RV/+LNPYxN+Iybs Nm0g== X-Gm-Message-State: AC+VfDxs0qzdW7+2NfpXo57meKk3knw5oakNtbjNfU16AhBGNrHjVbFa UI5agY9qpmzYpdrbLq3sqhzMT1VAW1uqCt9yxl8= X-Google-Smtp-Source: ACHHUZ4v/Iad6idkzl6MAtd7WQlpIXivKi6ay6+R/zc0zqhHiUfRe8D/NI9Yip4DQrOLUqbcaKVJsg== X-Received: by 2002:a17:902:d511:b0:1ab:7c4:eb24 with SMTP id b17-20020a170902d51100b001ab07c4eb24mr8129667plg.22.1684600028280; Sat, 20 May 2023 09:27:08 -0700 (PDT) Received: from stoup.. ([2602:ae:1598:4c01:d078:d94e:cb2b:a055]) by smtp.gmail.com with ESMTPSA id d12-20020a170903230c00b001a5260a6e6csm1697104plh.206.2023.05.20.09.27.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 20 May 2023 09:27:07 -0700 (PDT) From: Richard Henderson <richard.henderson@linaro.org> To: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org Subject: [PATCH 25/27] qemu/atomic128: Improve cmpxchg fallback for atomic16_set Date: Sat, 20 May 2023 09:26:32 -0700 Message-Id: <20230520162634.3991009-26-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230520162634.3991009-1-richard.henderson@linaro.org> References: <20230520162634.3991009-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::62c; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x62c.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, T_SCC_BODY_TEXT_LINE=-0.01 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-devel.nongnu.org> List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>, <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe> List-Archive: <https://lists.nongnu.org/archive/html/qemu-devel> List-Post: <mailto:qemu-devel@nongnu.org> List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help> List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>, <mailto:qemu-devel-request@nongnu.org?subject=subscribe> Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org |
Series |
accel/tcg: Improvements to atomic128.h
|
expand
|
diff --git a/host/include/generic/host/atomic128-ldst.h b/host/include/generic/host/atomic128-ldst.h index 79d208b7a4..80fff0643a 100644 --- a/host/include/generic/host/atomic128-ldst.h +++ b/host/include/generic/host/atomic128-ldst.h @@ -58,11 +58,14 @@ atomic16_read_rw(Int128 *ptr) static inline void ATTRIBUTE_ATOMIC128_OPT atomic16_set(Int128 *ptr, Int128 val) { - Int128 old = *ptr, cmp; + __int128_t *ptr_align = __builtin_assume_aligned(ptr, 16); + __int128_t old; + Int128Alias new; + + new.s = val; do { - cmp = old; - old = atomic16_cmpxchg(ptr, cmp, val); - } while (int128_ne(old, cmp)); + old = *ptr_align; + } while (!__sync_bool_compare_and_swap_16(ptr_align, old, new.i)); } #else
Use __sync_bool_compare_and_swap_16 to control the loop, rather than a separate comparison. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> --- host/include/generic/host/atomic128-ldst.h | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-)