From patchwork Wed Oct 21 04:51:41 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Richard Henderson X-Patchwork-Id: 1385333 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256 header.s=google header.b=l3RYswcb; dkim-atps=neutral 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 ozlabs.org (Postfix) with ESMTPS id 4CGJCB2jwBz9sRk for ; Wed, 21 Oct 2020 15:57:42 +1100 (AEDT) Received: from localhost ([::1]:46500 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kV6Bw-0007JL-DK for incoming@patchwork.ozlabs.org; Wed, 21 Oct 2020 00:57:40 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:57562) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kV66W-0000X8-ON for qemu-devel@nongnu.org; Wed, 21 Oct 2020 00:52:04 -0400 Received: from mail-pg1-x541.google.com ([2607:f8b0:4864:20::541]:40815) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1kV66U-0005i5-Lg for qemu-devel@nongnu.org; Wed, 21 Oct 2020 00:52:04 -0400 Received: by mail-pg1-x541.google.com with SMTP id x13so732798pgp.7 for ; Tue, 20 Oct 2020 21:52:02 -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=0vCw+XiUmQyJyI/l8oaOGKo4MiMqjFivosA30HUmSbA=; b=l3RYswcbt+mTW6WFhuP/z62gH/N4XC6AeMoCekWvQyflUKeXAwdcuzGZ+pfAlRZIZt 75Xl+2lohWg/31FyJ0Zl4J70xw5A6ZLk1QloldQhnvjFxjYqVeu93rp9mSxYJ7sQgdny juNw2utfcB5cgOnT/vaGY9MB9ScOrAk2TR0wNOWyyJgwu3hLaB4Fel68F1c/+vZTAVVs yBZrr4mL3+ZW+zXgVl49NAYG/AmxXb19o14/ERN1lIVfmH1z5K5WIu3abnlEMwhdOjtB 4PEvczcrEo2nj9anDZu42fAt4YLOjNGHqzqW4t/l6eXrAux/C3+iXYc4OI7Eo4yKc0AR ToXw== 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=0vCw+XiUmQyJyI/l8oaOGKo4MiMqjFivosA30HUmSbA=; b=VZPYdrczB7ZfrKIZNPCUb7YZMQfGV8Nv30Ed5hnwLHTcfvBNnNsT/C4WBAdZlQdtJa cHXX9i832/wwLe3bRLkwcx5lrDmr2/jgUA6uWMUeiushkxz1yqogA8N639LVnuPLdozc m9o14fJeVw4VtrZdPzYM9UoJ/6LYLmuXBM2dVHJRNdW9lmPSCSNyOLrknA6Lximqs+fp CcE/NFV5AwNW88V9z4/yE68oerozUvDlqsoswNqzCRGDkqr/svT7WHw4c9b/4039OMrQ 0+Wpga8lak7CyEN5sKsVhgT79lr4tQog/nyjCiSmsl5gKbuiXMapBq1LpzyWVExDNIV3 nXwQ== X-Gm-Message-State: AOAM5325TJ8HwxPzUCzKYYSZvoB5wspHbpEdcdAg+gmYe083aoGmH2L+ v3VHW3onmDgpaTvcB91pAUdMFyAkB37DkA== X-Google-Smtp-Source: ABdhPJxvVpzXiVA8J/Dj4aqlyfaRuAOdJzPF9mCaFNXKO4A6NVy6+RrGe8JtkbkaCqoJCZqk9PF5nw== X-Received: by 2002:a62:ee10:0:b029:142:2501:34e2 with SMTP id e16-20020a62ee100000b0290142250134e2mr1424398pfi.59.1603255920735; Tue, 20 Oct 2020 21:52:00 -0700 (PDT) Received: from localhost.localdomain ([71.212.141.89]) by smtp.gmail.com with ESMTPSA id j11sm620070pfh.143.2020.10.20.21.51.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 Oct 2020 21:52:00 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [RFC PATCH 07/15] softfloat: Use int128.h for some operations Date: Tue, 20 Oct 2020 21:51:41 -0700 Message-Id: <20201021045149.1582203-8-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201021045149.1582203-1-richard.henderson@linaro.org> References: <20201021045149.1582203-1-richard.henderson@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::541; envelope-from=richard.henderson@linaro.org; helo=mail-pg1-x541.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. 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: alex.bennee@linaro.org, David Hildenbrand Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Use our Int128, which wraps the compiler's __int128_t, instead of open-coding shifts and arithmetic. We'd need to extend Int128 to to replace more than these four. Reviewed-by: Alex Bennée Reviewed-by: David Hildenbrand Signed-off-by: Richard Henderson --- include/fpu/softfloat-macros.h | 65 ++++++++++++++-------------------- 1 file changed, 26 insertions(+), 39 deletions(-) diff --git a/include/fpu/softfloat-macros.h b/include/fpu/softfloat-macros.h index 57845f8af0..e6f05c048e 100644 --- a/include/fpu/softfloat-macros.h +++ b/include/fpu/softfloat-macros.h @@ -84,6 +84,7 @@ this code that are retained. #include "fpu/softfloat-types.h" #include "qemu/host-utils.h" +#include "qemu/int128.h" /*---------------------------------------------------------------------------- | Shifts `a' right by the number of bits given in `count'. If any nonzero @@ -191,28 +192,14 @@ static inline void | which are stored at the locations pointed to by `z0Ptr' and `z1Ptr'. *----------------------------------------------------------------------------*/ -static inline void - shift128Right( - uint64_t a0, uint64_t a1, int count, uint64_t *z0Ptr, uint64_t *z1Ptr) +static inline void shift128Right(uint64_t a0, uint64_t a1, int count, + uint64_t *z0Ptr, uint64_t *z1Ptr) { - uint64_t z0, z1; - int8_t negCount = ( - count ) & 63; - - if ( count == 0 ) { - z1 = a1; - z0 = a0; - } - else if ( count < 64 ) { - z1 = ( a0<>count ); - z0 = a0>>count; - } - else { - z1 = (count < 128) ? (a0 >> (count & 63)) : 0; - z0 = 0; - } - *z1Ptr = z1; - *z0Ptr = z0; + Int128 a = int128_make128(a1, a0); + Int128 z = int128_shr(a, count); + *z0Ptr = int128_gethi(z); + *z1Ptr = int128_getlo(z); } /*---------------------------------------------------------------------------- @@ -352,13 +339,11 @@ static inline void shortShift128Left(uint64_t a0, uint64_t a1, int count, static inline void shift128Left(uint64_t a0, uint64_t a1, int count, uint64_t *z0Ptr, uint64_t *z1Ptr) { - if (count < 64) { - *z1Ptr = a1 << count; - *z0Ptr = count == 0 ? a0 : (a0 << count) | (a1 >> (-count & 63)); - } else { - *z1Ptr = 0; - *z0Ptr = a1 << (count - 64); - } + Int128 a = int128_make128(a1, a0); + Int128 z = int128_shl(a, count); + + *z0Ptr = int128_gethi(z); + *z1Ptr = int128_getlo(z); } /*---------------------------------------------------------------------------- @@ -405,15 +390,15 @@ static inline void *----------------------------------------------------------------------------*/ static inline void - add128( - uint64_t a0, uint64_t a1, uint64_t b0, uint64_t b1, uint64_t *z0Ptr, uint64_t *z1Ptr ) +add128(uint64_t a0, uint64_t a1, uint64_t b0, uint64_t b1, + uint64_t *z0Ptr, uint64_t *z1Ptr) { - uint64_t z1; - - z1 = a1 + b1; - *z1Ptr = z1; - *z0Ptr = a0 + b0 + ( z1 < a1 ); + Int128 a = int128_make128(a1, a0); + Int128 b = int128_make128(b1, b0); + Int128 z = int128_add(a, b); + *z0Ptr = int128_gethi(z); + *z1Ptr = int128_getlo(z); } /*---------------------------------------------------------------------------- @@ -463,13 +448,15 @@ static inline void *----------------------------------------------------------------------------*/ static inline void - sub128( - uint64_t a0, uint64_t a1, uint64_t b0, uint64_t b1, uint64_t *z0Ptr, uint64_t *z1Ptr ) +sub128(uint64_t a0, uint64_t a1, uint64_t b0, uint64_t b1, + uint64_t *z0Ptr, uint64_t *z1Ptr) { + Int128 a = int128_make128(a1, a0); + Int128 b = int128_make128(b1, b0); + Int128 z = int128_sub(a, b); - *z1Ptr = a1 - b1; - *z0Ptr = a0 - b0 - ( a1 < b1 ); - + *z0Ptr = int128_gethi(z); + *z1Ptr = int128_getlo(z); } /*----------------------------------------------------------------------------