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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 20309C4332F for ; Tue, 11 Jan 2022 13:50:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241187AbiAKNt7 (ORCPT ); Tue, 11 Jan 2022 08:49:59 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47442 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241094AbiAKNtz (ORCPT ); Tue, 11 Jan 2022 08:49:55 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 10743C061751; Tue, 11 Jan 2022 05:49:55 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 9F06A61639; Tue, 11 Jan 2022 13:49:54 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 14505C36AEB; Tue, 11 Jan 2022 13:49:53 +0000 (UTC) Authentication-Results: smtp.kernel.org; dkim=pass (1024-bit key) header.d=zx2c4.com header.i=@zx2c4.com header.b="ZNMGXo8Z" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zx2c4.com; s=20210105; t=1641908991; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=3WqEHjfqE4Zyzu/qNdBLfRyfBWN4Gk0YJJEdY2wFzB0=; b=ZNMGXo8ZDF1V482kGCJu2hQyrdkOmoM1KYlVbLCBgX3oIZ4GMyDDRg5BjQcpOpt12pX1EW ffJnHDZ5rIRF8PGiPbG0TCvU5B95x2KQh/A4cD4LvbtVMKbukegYWcQMMYPDlqnqlCEL5B 3E3AHYACSBfcJC39ELbRwOBr5nMadDU= Received: by mail.zx2c4.com (ZX2C4 Mail Server) with ESMTPSA id a8869ee1 (TLSv1.3:AEAD-AES256-GCM-SHA384:256:NO); Tue, 11 Jan 2022 13:49:51 +0000 (UTC) From: "Jason A. Donenfeld" To: linux-crypto@vger.kernel.org, netdev@vger.kernel.org, wireguard@lists.zx2c4.com, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, geert@linux-m68k.org, tytso@mit.edu, gregkh@linuxfoundation.org, jeanphilippe.aumasson@gmail.com, ardb@kernel.org Cc: "Jason A. Donenfeld" , Herbert Xu Subject: [PATCH crypto 1/2] lib/crypto: blake2s-generic: reduce code size on small systems Date: Tue, 11 Jan 2022 14:49:33 +0100 Message-Id: <20220111134934.324663-2-Jason@zx2c4.com> In-Reply-To: <20220111134934.324663-1-Jason@zx2c4.com> References: <20220111134934.324663-1-Jason@zx2c4.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Re-wind the loops entirely on kernels optimized for code size. This is really not good at all performance-wise. But on m68k, it shaves off 4k of code size, which is apparently important. Cc: Geert Uytterhoeven Cc: Herbert Xu Cc: Ard Biesheuvel Signed-off-by: Jason A. Donenfeld --- lib/crypto/blake2s-generic.c | 30 ++++++++++++++++++------------ 1 file changed, 18 insertions(+), 12 deletions(-) diff --git a/lib/crypto/blake2s-generic.c b/lib/crypto/blake2s-generic.c index 75ccb3e633e6..990f000e22ee 100644 --- a/lib/crypto/blake2s-generic.c +++ b/lib/crypto/blake2s-generic.c @@ -46,7 +46,7 @@ void blake2s_compress_generic(struct blake2s_state *state, const u8 *block, { u32 m[16]; u32 v[16]; - int i; + int i, j; WARN_ON(IS_ENABLED(DEBUG) && (nblocks > 1 && inc != BLAKE2S_BLOCK_SIZE)); @@ -86,17 +86,23 @@ void blake2s_compress_generic(struct blake2s_state *state, const u8 *block, G(r, 6, v[2], v[ 7], v[ 8], v[13]); \ G(r, 7, v[3], v[ 4], v[ 9], v[14]); \ } while (0) - ROUND(0); - ROUND(1); - ROUND(2); - ROUND(3); - ROUND(4); - ROUND(5); - ROUND(6); - ROUND(7); - ROUND(8); - ROUND(9); - + if (IS_ENABLED(CONFIG_CC_OPTIMIZE_FOR_SIZE)) { + for (i = 0; i < 10; ++i) { + for (j = 0; j < 8; ++j) + G(i, j, v[j % 4], v[((j + (j / 4)) % 4) + 4], v[((j + 2 * (j / 4)) % 4) + 8], v[((j + 3 * (j / 4)) % 4) + 12]); + } + } else { + ROUND(0); + ROUND(1); + ROUND(2); + ROUND(3); + ROUND(4); + ROUND(5); + ROUND(6); + ROUND(7); + ROUND(8); + ROUND(9); + } #undef G #undef ROUND -- 2.34.1