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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 557D4C433EF for ; Thu, 7 Oct 2021 20:38:16 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id EC48860F9D for ; Thu, 7 Oct 2021 20:38:15 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org EC48860F9D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linaro.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=nongnu.org Received: from localhost ([::1]:47788 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mYa9f-0007PX-6q for qemu-devel@archiver.kernel.org; Thu, 07 Oct 2021 16:38:15 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:60610) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mYZXG-0007W3-KY for qemu-devel@nongnu.org; Thu, 07 Oct 2021 15:58:36 -0400 Received: from mail-pj1-x1035.google.com ([2607:f8b0:4864:20::1035]:38557) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1mYZXD-0003qT-TA for qemu-devel@nongnu.org; Thu, 07 Oct 2021 15:58:34 -0400 Received: by mail-pj1-x1035.google.com with SMTP id g13-20020a17090a3c8d00b00196286963b9so7734449pjc.3 for ; Thu, 07 Oct 2021 12:58:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=dnSe3962IT7WFzPUDJo4zPb5duwUCMvhH1e2c+XS9Mk=; b=ShOu3QrH35Lawj7HcuhharPGWvR/bjeGjoB83bbcteaRpP9MUk3tUsWFiwXe3cCuI2 Pby53dEAfAscTnYLLhYlUDypz9rAFsbbSafJDqTtlitJ5R7MLTSQEkrvjZkKeZ4vTdy0 +F5ZZLX9ARB7MBjqUcjcCOlEj6UetxhQHyb0dXE/WigfQv3P4Eg/6ctpKJm4ADS8S93j 7fgyaGv6X8HgrUHA/iCuN9l4z4iHk/ZzU9YWEnCkvZ/xw0xZfc1SgXtja0hLuWq1C+hG 6AgrhizXb87JOCavWu0GCV8HaTTlPir6qRWGiexqGauectNklluof8im8gK3ySP9T4AI s1eA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=dnSe3962IT7WFzPUDJo4zPb5duwUCMvhH1e2c+XS9Mk=; b=PgWnZtUqem/nswD4ZT0+8TLraozZbuDz/R4nLMIFfuJf5ITe+eBN0WqkLUMIevBvwC emiOoqFTbaYjY467oqWaz1NJuumb6Zd7DFFSEnRM0U7FMSbkIqfckiu8VEdeR3huGiyU 8WcErWVLM5Dl2uqh92QmGgZy3bBuWYj9u8MyIhXWg6Bdgaj+0B4pN2SHpgAq7Drmk3k8 d4mYgWQSwJyhhEwejfEE44mw2nO7+lyx0O9aTDdQBl4324igX+DB4fSK77OIdIDuAyiO sTZ9Z37qZGJfP95hNDmkt8OkuyL8ZHbejExh4mUIAjcfnSVDa5ZiIUQOpij+iG71i0GW tAtw== X-Gm-Message-State: AOAM531ln3JrbMRSpa+5dLcmAHx22Lc8BLvB3jldjSpYPrZQB/aBP9XH rRich/PQ2vA2FYaYIgAaYB81QbCfNyk/PA== X-Google-Smtp-Source: ABdhPJznnjoDIZklZ3an/PGKzcSaGoq6oMet2W5k0LVbL4qqGYnxVqb4t2Jvy1SjejeloX3Kj8LFQw== X-Received: by 2002:a17:90a:b288:: with SMTP id c8mr6962595pjr.67.1633636710687; Thu, 07 Oct 2021 12:58:30 -0700 (PDT) Received: from localhost.localdomain ([71.212.134.125]) by smtp.gmail.com with ESMTPSA id t2sm8995380pjf.1.2021.10.07.12.58.29 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 Oct 2021 12:58:29 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH v2 43/48] tcg/optimize: Stop forcing z_mask to "garbage" for 32-bit values Date: Thu, 7 Oct 2021 12:54:51 -0700 Message-Id: <20211007195456.1168070-44-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211007195456.1168070-1-richard.henderson@linaro.org> References: <20211007195456.1168070-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::1035; envelope-from=richard.henderson@linaro.org; helo=mail-pj1-x1035.google.com X-Spam_score_int: -1 X-Spam_score: -0.2 X-Spam_bar: / X-Spam_report: (-0.2 / 5.0 requ) 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: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This "garbage" setting pre-dates the addition of the type changing opcodes INDEX_op_ext_i32_i64, INDEX_op_extu_i32_i64, and INDEX_op_extr{l,h}_i64_i32. So now we have a definitive points at which to adjust z_mask to eliminate such bits from the 32-bit operands. Signed-off-by: Richard Henderson --- tcg/optimize.c | 35 ++++++++++++++++------------------- 1 file changed, 16 insertions(+), 19 deletions(-) diff --git a/tcg/optimize.c b/tcg/optimize.c index 9c11f83a4a..5ef41e2769 100644 --- a/tcg/optimize.c +++ b/tcg/optimize.c @@ -123,10 +123,6 @@ static void init_ts_info(OptContext *ctx, TCGTemp *ts) ti->is_const = true; ti->val = ts->val; ti->z_mask = ts->val; - if (TCG_TARGET_REG_BITS > 32 && ts->type == TCG_TYPE_I32) { - /* High bits of a 32-bit quantity are garbage. */ - ti->z_mask |= ~0xffffffffull; - } } else { ti->is_const = false; ti->z_mask = -1; @@ -191,7 +187,6 @@ static bool tcg_opt_gen_mov(OptContext *ctx, TCGOp *op, TCGArg dst, TCGArg src) TCGTemp *src_ts = arg_temp(src); TempOptInfo *di; TempOptInfo *si; - uint64_t z_mask; TCGOpcode new_op; if (ts_are_copies(dst_ts, src_ts)) { @@ -223,12 +218,7 @@ static bool tcg_opt_gen_mov(OptContext *ctx, TCGOp *op, TCGArg dst, TCGArg src) op->args[0] = dst; op->args[1] = src; - z_mask = si->z_mask; - if (TCG_TARGET_REG_BITS > 32 && new_op == INDEX_op_mov_i32) { - /* High bits of the destination are now garbage. */ - z_mask |= ~0xffffffffull; - } - di->z_mask = z_mask; + di->z_mask = si->z_mask; if (src_ts->type == dst_ts->type) { TempOptInfo *ni = ts_info(si->next_copy); @@ -246,9 +236,14 @@ static bool tcg_opt_gen_mov(OptContext *ctx, TCGOp *op, TCGArg dst, TCGArg src) static bool tcg_opt_gen_movi(OptContext *ctx, TCGOp *op, TCGArg dst, uint64_t val) { - /* Convert movi to mov with constant temp. */ - TCGTemp *tv = tcg_constant_internal(ctx->type, val); + TCGTemp *tv; + if (ctx->type == TCG_TYPE_I32) { + val = (int32_t)val; + } + + /* Convert movi to mov with constant temp. */ + tv = tcg_constant_internal(ctx->type, val); init_ts_info(ctx, tv); return tcg_opt_gen_mov(ctx, op, dst, temp_arg(tv)); } @@ -707,14 +702,16 @@ static bool fold_masks(OptContext *ctx, TCGOp *op) uint64_t z_mask = ctx->z_mask; /* - * 32-bit ops generate 32-bit results. For the result is zero test - * below, we can ignore high bits, but for further optimizations we - * need to record that the high bits contain garbage. + * 32-bit ops generate 32-bit results, which for the purpose of + * simplifying tcg are sign-extended. Certainly that's how we + * represent our constants elsewhere. Note that the bits will + * be reset properly for a 64-bit value when encountering the + * type changing opcodes. */ if (ctx->type == TCG_TYPE_I32) { - ctx->z_mask |= MAKE_64BIT_MASK(32, 32); - a_mask &= MAKE_64BIT_MASK(0, 32); - z_mask &= MAKE_64BIT_MASK(0, 32); + a_mask = (int32_t)a_mask; + z_mask = (int32_t)z_mask; + ctx->z_mask = z_mask; } if (z_mask == 0) { -- 2.25.1