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=-14.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 33DA3C433FF for ; Mon, 12 Aug 2019 19:36:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F19EE20842 for ; Mon, 12 Aug 2019 19:36:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="L+vcXW+K" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727084AbfHLTgM (ORCPT ); Mon, 12 Aug 2019 15:36:12 -0400 Received: from mail-wr1-f66.google.com ([209.85.221.66]:35503 "EHLO mail-wr1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726880AbfHLTgI (ORCPT ); Mon, 12 Aug 2019 15:36:08 -0400 Received: by mail-wr1-f66.google.com with SMTP id k2so19761991wrq.2; Mon, 12 Aug 2019 12:36:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=k2Q5Zs7N8/j45SfwYDhEjobCOU8g/47tJEkHFeIxHdQ=; b=L+vcXW+KZ8BQTvrEhjNTM9/4fNSXashX2Z9MybFGgXHOgLaxQrwJaCZIw8tyuMHQbW oAI5ft/lKpjXyHMpeFPuVksxq3JQfhfXjNYkF1lbSDiy+gb8Xem7Hlz7OW9uBiMyLGU5 t0/hPwXrEiZMfO0L7cw9BacR+cu+KpzHaOYoAVQMWS3pqGBFdgcoGoMiQifCB3Is8CxJ qJewGM+821XESthu8Qp2EFHTARjMpbjmSuagNrZ0if4y05JOIGEBF5ZDh4AKxS8OZty1 s/ctoFI0rUGmTXxdr1EvvpwLj9Pa8F/3mtWmnEcHi/vOVca9MCmVJPRpUPNx74ElYrJq oVwA== 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:mime-version :content-transfer-encoding; bh=k2Q5Zs7N8/j45SfwYDhEjobCOU8g/47tJEkHFeIxHdQ=; b=Of8ciqMrej3C44n72Ki/BZ8ZumtHk+Nnr4lFa5tf8lokdT+j72v4WVMbV/cY/MEqCd 46ciy1ucTx/8CWQQM6DBeFTn5xzYk9ilhXBS06PvNFtTG5Xr+dVexfjYImHm1aHepXdI kt6OlZDptricKN9TNpeBBtLREMbbkZgSubG79mGbnqeBvd/7YrtXFG8DLrN4H3gu0nB4 heLj5I89kQvzqjGtBa73C2nGSj1FbRWvytsmJSir4gD9zFyKe+iiDUXSmuaBnK4Gbf3m XH8MFG0LHEfzc5LqRZ0VkpQYvilRKDPlcLBV69JfKdzKk37VITbbtm9r4GW+1oWS4x3R Ym9g== X-Gm-Message-State: APjAAAXdYqYTbpQSltPPUoifGRUqYUcexcW/aW6os+Ul/a8sVT8hmxkm GR9qkw6H6IPW/Mj14luLdSk= X-Google-Smtp-Source: APXvYqzswoVYVjt/R00117iT42wlOz4HmNFFf19yfz3oM8qk/uVTrP34TUwKNyiEzRSwhGx5aTwW8g== X-Received: by 2002:adf:fe08:: with SMTP id n8mr40819056wrr.60.1565638566277; Mon, 12 Aug 2019 12:36:06 -0700 (PDT) Received: from localhost.localdomain ([2a01:4f8:222:2f1b::2]) by smtp.gmail.com with ESMTPSA id l3sm26874346wrb.41.2019.08.12.12.36.04 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Mon, 12 Aug 2019 12:36:05 -0700 (PDT) From: Nathan Chancellor To: Ralf Baechle , James Hogan , Herbert Xu Cc: linux-mips@vger.kernel.org, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com, Nathan Chancellor , Nick Desaulniers Subject: [PATCH v2] lib/mpi: Eliminate unused umul_ppmm definitions for MIPS Date: Mon, 12 Aug 2019 12:32:57 -0700 Message-Id: <20190812193256.55103-1-natechancellor@gmail.com> X-Mailer: git-send-email 2.23.0.rc2 MIME-Version: 1.0 X-Patchwork-Bot: notify Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Clang errors out when building this macro: lib/mpi/generic_mpih-mul1.c:37:24: error: invalid use of a cast in a inline asm context requiring an l-value: remove the cast or build with -fheinous-gnu-extensions umul_ppmm(prod_high, prod_low, s1_ptr[j], s2_limb); ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ lib/mpi/longlong.h:652:20: note: expanded from macro 'umul_ppmm' : "=l" ((USItype)(w0)), \ ~~~~~~~~~~^~~ lib/mpi/generic_mpih-mul1.c:37:3: error: invalid output constraint '=h' in asm umul_ppmm(prod_high, prod_low, s1_ptr[j], s2_limb); ^ lib/mpi/longlong.h:653:7: note: expanded from macro 'umul_ppmm' "=h" ((USItype)(w1)) \ ^ 2 errors generated. The C version that is used for GCC 4.4 and up works well with clang; however, it is not currently being used because Clang masks itself as GCC 4.2.1 for compatibility reasons. As Nick points out, we require GCC 4.6 and newer in the kernel so we can eliminate all of the versioning checks and just use the C version of umul_ppmm for all supported compilers. Link: https://github.com/ClangBuiltLinux/linux/issues/605 Suggested-by: Nick Desaulniers Signed-off-by: Nathan Chancellor --- This supersedes the following two patches: https://lore.kernel.org/lkml/20190812033120.43013-4-natechancellor@gmail.com/ https://lore.kernel.org/lkml/20190812033120.43013-5-natechancellor@gmail.com/ I labelled this as a v2 so those don't get applied. lib/mpi/longlong.h | 36 +----------------------------------- 1 file changed, 1 insertion(+), 35 deletions(-) diff --git a/lib/mpi/longlong.h b/lib/mpi/longlong.h index 3bb6260d8f42..2dceaca27489 100644 --- a/lib/mpi/longlong.h +++ b/lib/mpi/longlong.h @@ -639,30 +639,12 @@ do { \ ************** MIPS ***************** ***************************************/ #if defined(__mips__) && W_TYPE_SIZE == 32 -#if (__GNUC__ >= 5) || (__GNUC__ >= 4 && __GNUC_MINOR__ >= 4) #define umul_ppmm(w1, w0, u, v) \ do { \ UDItype __ll = (UDItype)(u) * (v); \ w1 = __ll >> 32; \ w0 = __ll; \ } while (0) -#elif __GNUC__ > 2 || __GNUC_MINOR__ >= 7 -#define umul_ppmm(w1, w0, u, v) \ - __asm__ ("multu %2,%3" \ - : "=l" ((USItype)(w0)), \ - "=h" ((USItype)(w1)) \ - : "d" ((USItype)(u)), \ - "d" ((USItype)(v))) -#else -#define umul_ppmm(w1, w0, u, v) \ - __asm__ ("multu %2,%3\n" \ - "mflo %0\n" \ - "mfhi %1" \ - : "=d" ((USItype)(w0)), \ - "=d" ((USItype)(w1)) \ - : "d" ((USItype)(u)), \ - "d" ((USItype)(v))) -#endif #define UMUL_TIME 10 #define UDIV_TIME 100 #endif /* __mips__ */ @@ -687,7 +669,7 @@ do { \ : "d" ((UDItype)(u)), \ "d" ((UDItype)(v))); \ } while (0) -#elif (__GNUC__ >= 5) || (__GNUC__ >= 4 && __GNUC_MINOR__ >= 4) +#else #define umul_ppmm(w1, w0, u, v) \ do { \ typedef unsigned int __ll_UTItype __attribute__((mode(TI))); \ @@ -695,22 +677,6 @@ do { \ w1 = __ll >> 64; \ w0 = __ll; \ } while (0) -#elif __GNUC__ > 2 || __GNUC_MINOR__ >= 7 -#define umul_ppmm(w1, w0, u, v) \ - __asm__ ("dmultu %2,%3" \ - : "=l" ((UDItype)(w0)), \ - "=h" ((UDItype)(w1)) \ - : "d" ((UDItype)(u)), \ - "d" ((UDItype)(v))) -#else -#define umul_ppmm(w1, w0, u, v) \ - __asm__ ("dmultu %2,%3\n" \ - "mflo %0\n" \ - "mfhi %1" \ - : "=d" ((UDItype)(w0)), \ - "=d" ((UDItype)(w1)) \ - : "d" ((UDItype)(u)), \ - "d" ((UDItype)(v))) #endif #define UMUL_TIME 20 #define UDIV_TIME 140 -- 2.23.0.rc2