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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 BCD2EC6379F for ; Sun, 22 Nov 2020 15:27:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 85C1420773 for ; Sun, 22 Nov 2020 15:27:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="K6hRn/gj" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727876AbgKVP1m (ORCPT ); Sun, 22 Nov 2020 10:27:42 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59978 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727317AbgKVP1l (ORCPT ); Sun, 22 Nov 2020 10:27:41 -0500 Received: from mail-wm1-x342.google.com (mail-wm1-x342.google.com [IPv6:2a00:1450:4864:20::342]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8BBB5C0613CF for ; Sun, 22 Nov 2020 07:27:41 -0800 (PST) Received: by mail-wm1-x342.google.com with SMTP id c9so15530113wml.5 for ; Sun, 22 Nov 2020 07:27:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=Zltb2qLLAHtwKEbB3MDd2Q4e9WUZbVZ+eHiHjUTpFQw=; b=K6hRn/gjKJq711s95wMK2hXdueFWQP8HodgZW0aUJ0cKRF2goGN4U/NprCXzcRWGcb YP+nruKdzyOJcrCoFh2huXrogs0aEuYeqgdLF5l5/VwI4KYvMhdvDzwvQ/4Pg6Y+Cwji CXiytIaFK1Z5QyrccWcMbzp0uRppLcN6QJO+nIJEY8+y+Z6adFO43ChiBWTPbswc5y6V U3NRzu5bjhJEgsE8rILt1idJIgPt40IicNYN3K1IFn3gIfgFUbkBu1kTEms9d4Cc2tVu DLJNcPrKx+hhJsNV8Jsv1wZf+6u+hwfKESA6hglK/BrSv5/CJ2mUPO7Sr0C+jKKsF2fp ainw== 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=Zltb2qLLAHtwKEbB3MDd2Q4e9WUZbVZ+eHiHjUTpFQw=; b=rvaJBLmimPD7d2dkGkMu1bmPf7LzzEOtMjQOQnWfVxHWbRgY77oUU31F+zH9sF2kcJ bPoXL3eO8xocvBp3fHlUnF6qNCJ3R7sTxBK9+4ROujQ/7C+HawAD2FjT4aGLCmodHDEM rbtLoyOowNU6ACH0lyIiHvCgDp87uLTs1GJV07TAy8/otTt++VvdYf8pYmOpIHVVYKnt O2lmZffo+NoBLM3i3ytUrsQdIrXj8WGwsCgPrIsY+laCNCvXV0kWAWJv7HmMkDU/JzS6 4zucNQqyMMOd1SyNrLL89DQIrUMLM6dsFLar4qu2XaSSMTbHIMuBy7l0MssaqC4nM32u mcHg== X-Gm-Message-State: AOAM5331KMSX/hV6qpzk7zziFqgItCYZe5BR+/sQNlxgjcUlC2b6j93R kxXQD20sxTgmc1biQGkW3PwKllf2v+c= X-Google-Smtp-Source: ABdhPJxTiQMzoiYGEex5XXD0wJV+bhhN64++XEw5aVNva0X5uyl9EOR7KnxJJ3upQjU+czlhQmUz+w== X-Received: by 2002:a1c:6a16:: with SMTP id f22mr11407539wmc.86.1606058860032; Sun, 22 Nov 2020 07:27:40 -0800 (PST) Received: from localhost.localdomain ([2a02:a03f:b7fe:f700:b0e1:b041:18e2:46cf]) by smtp.gmail.com with ESMTPSA id k1sm13712265wrp.23.2020.11.22.07.27.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 22 Nov 2020 07:27:39 -0800 (PST) From: Luc Van Oostenryck To: linux-sparse@vger.kernel.org Cc: Luc Van Oostenryck Subject: [PATCH 7/7] not: simplify ((x cmp y) {&,|,^} (x !cmp y)) --> {0,1,1} Date: Sun, 22 Nov 2020 16:27:31 +0100 Message-Id: <20201122152731.10994-8-luc.vanoostenryck@gmail.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201122152731.10994-1-luc.vanoostenryck@gmail.com> References: <20201122152731.10994-1-luc.vanoostenryck@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-sparse@vger.kernel.org Simplify bitwise operations on a compare and its complement into 0 (for &) or 1 for (| and ^). Signed-off-by: Luc Van Oostenryck --- simplify.c | 24 +++++++++++++++++++++--- validation/optim/cse-not02.c | 1 - 2 files changed, 21 insertions(+), 4 deletions(-) diff --git a/simplify.c b/simplify.c index b41c155735d1..9938a5974744 100644 --- a/simplify.c +++ b/simplify.c @@ -1632,7 +1632,7 @@ static int simplify_compare(struct instruction *insn) static int simplify_and_one_side(struct instruction *insn, pseudo_t *p1, pseudo_t *p2) { - struct instruction *def; + struct instruction *def, *defr = NULL; pseudo_t src1 = *p1; switch (DEF_OPCODE(def, src1)) { @@ -1640,6 +1640,12 @@ static int simplify_and_one_side(struct instruction *insn, pseudo_t *p1, pseudo_ if (def->src == *p2) return replace_with_value(insn, 0); break; + case OP_BINCMP ... OP_BINCMP_END: + if (DEF_OPCODE(defr, *p2) == opcode_negate(def->opcode)) { + if (def->src1 == defr->src1 && def->src2 == defr->src2) + return replace_with_value(insn, 0); + } + break; } return 0; } @@ -1652,7 +1658,7 @@ static int simplify_and(struct instruction *insn) static int simplify_ior_one_side(struct instruction *insn, pseudo_t *p1, pseudo_t *p2) { - struct instruction *def; + struct instruction *def, *defr = NULL; pseudo_t src1 = *p1; switch (DEF_OPCODE(def, src1)) { @@ -1660,6 +1666,12 @@ static int simplify_ior_one_side(struct instruction *insn, pseudo_t *p1, pseudo_ if (def->src == *p2) return replace_with_value(insn, bits_mask(insn->size)); break; + case OP_BINCMP ... OP_BINCMP_END: + if (DEF_OPCODE(defr, *p2) == opcode_negate(def->opcode)) { + if (def->src1 == defr->src1 && def->src2 == defr->src2) + return replace_with_value(insn, 1); + } + break; } return 0; } @@ -1672,7 +1684,7 @@ static int simplify_ior(struct instruction *insn) static int simplify_xor_one_side(struct instruction *insn, pseudo_t *p1, pseudo_t *p2) { - struct instruction *def; + struct instruction *def, *defr = NULL; pseudo_t src1 = *p1; switch (DEF_OPCODE(def, src1)) { @@ -1680,6 +1692,12 @@ static int simplify_xor_one_side(struct instruction *insn, pseudo_t *p1, pseudo_ if (def->src == *p2) return replace_with_value(insn, bits_mask(insn->size)); break; + case OP_BINCMP ... OP_BINCMP_END: + if (DEF_OPCODE(defr, *p2) == opcode_negate(def->opcode)) { + if (def->src1 == defr->src1 && def->src2 == defr->src2) + return replace_with_value(insn, 1); + } + break; } return 0; } diff --git a/validation/optim/cse-not02.c b/validation/optim/cse-not02.c index aa54a375a9ea..70addebcfbb6 100644 --- a/validation/optim/cse-not02.c +++ b/validation/optim/cse-not02.c @@ -5,7 +5,6 @@ int xor(int a, int b) { return ((a == b) ^ (a != b)) == 1; } /* * check-name: cse-not02 * check-command: test-linearize -Wno-decl $file - * check-known-to-fail * * check-output-ignore * check-output-returns: 1 -- 2.29.2