From nobody Sat Jun 29 03:18:05 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=linaro.org ARC-Seal: i=1; a=rsa-sha256; t=1610052400; cv=none; d=zohomail.com; s=zohoarc; b=PO04u7+AqEIzLYYjkeUJDSBAP9tJz0GP10C16njBIC6TqYpw+NguHnlkN2xyXlydsjurYMvpSOSMYYqrIn2+j+tw/jnUQzfauN8TpxhmpFWEAp7K+vcDj9QHvD1W2gDqp8MfB3xm0gtHff8B7fmrI+g46FjgnRlvYAgWLSomFwA= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1610052400; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=2ceeCrB5ObxXqiOq+gfMl3DKYMpwFGb7NLNLd4oEq1k=; b=BiUbIXBBli9D8Pg+gpzmml4N47sxrKC2gierOK4L7FfsNnfqFBTD9NAM4UJbKY03+YCoTPjvPbqDLnJV5XsQw1WAHacIRgRLBWEH5wH5DuywqpofkFsqmSjVAJSFxBWq7bgfmEqai8r7zMgyv/I8A8jHWJ++eEISYhXX400iuYI= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1610052400600420.523739737553; Thu, 7 Jan 2021 12:46:40 -0800 (PST) Received: from localhost ([::1]:53934 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kxcB5-0006Zv-Fb for importer@patchew.org; Thu, 07 Jan 2021 15:46:39 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:48670) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kxbhe-0001b2-57 for qemu-devel@nongnu.org; Thu, 07 Jan 2021 15:16:14 -0500 Received: from mail-pl1-x631.google.com ([2607:f8b0:4864:20::631]:46965) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1kxbhS-0001iV-2e for qemu-devel@nongnu.org; Thu, 07 Jan 2021 15:16:13 -0500 Received: by mail-pl1-x631.google.com with SMTP id v3so4138888plz.13 for ; Thu, 07 Jan 2021 12:16:00 -0800 (PST) Received: from localhost.localdomain (rrcs-173-197-107-21.west.biz.rr.com. [173.197.107.21]) by smtp.gmail.com with ESMTPSA id v6sm6516265pfi.31.2021.01.07.12.15.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 Jan 2021 12:15:58 -0800 (PST) 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=2ceeCrB5ObxXqiOq+gfMl3DKYMpwFGb7NLNLd4oEq1k=; b=N9pVmwDPAMYoZqD5ZPzkVozef2ojVxu9BXFUW37mllgJzk67+mNgrak/E+kkK60dKe 3ACTl+yUDpAvxRJwHgMgpMjmlW5DNy7qK6AFe3Y5xSQdWwYQcTAHT3sLtCVxJgdVZtfE PK2P6+VRAK8Um7oT05RrROJtCBK6kVmCzd7+xYng68rCXvpG9+bY5lLNaCsBexbFOz+L p4XhDWinsAYP04TZyppmPuqjpoBHnihtlgE8Fs2w+g3pIY1xuV6obnahvpL9ohdAp5BO wktlvrHNlXlWBWI7b5d2Epto5Keqa7unMZijQuT0S6YQYzvfYi3gEWaFSG8nlWuGlQqQ 7kBg== 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=2ceeCrB5ObxXqiOq+gfMl3DKYMpwFGb7NLNLd4oEq1k=; b=p6HGIudI5cSUfZT+8xRVdkl76AGDmjnFTxCxYju1iY4m6+G+VjHmyjkB1lkdOb9Gzh 7K5qx8gzkqjmIwSyEbrO30znBVIhTZmGQk9FQ9f6ro3LHKGb467Qj/jS7HIsCZzzOdwE qWpe1x7iwMRa9/S5ELMysEeGD7rCaZ3a65vNUzoAabY+ldhmgRLC7x9RiBzepgsRHqig sBudEWxfaPBdUq8/ZT6LCdkqmtkvmWcBfY7jxBh+6E/01g19g+AjfS8uAbeMDukO6kCZ ZJJTpW4Ea82zMPpNExdurqpqM0fUg3v/mAok6P0eZpSgQnu2O//OgUQOOwLcNJZKpSoL Rl9Q== X-Gm-Message-State: AOAM530OTfMe1/LMfFmKo5LA2WXokjpTvlwKbep2s9kHsww4Ky6QI+E/ xogJT10gcwDpXtMcYXTJYyLJt/s7B6XjRQ== X-Google-Smtp-Source: ABdhPJw8MlPkf/Eix6+OxuySqV6ggPIe2HAtDIMdY28YVZPNyMVKkGIpnHmJ0n1NMJpp2m/8LJgDkg== X-Received: by 2002:a17:90a:bb8c:: with SMTP id v12mr150074pjr.227.1610050558802; Thu, 07 Jan 2021 12:15:58 -0800 (PST) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PULL 39/47] tcg/riscv: Remove branch-over-branch fallback Date: Thu, 7 Jan 2021 10:14:40 -1000 Message-Id: <20210107201448.1152301-40-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210107201448.1152301-1-richard.henderson@linaro.org> References: <20210107201448.1152301-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::631; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x631.google.com 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: peter.maydell@linaro.org, Alistair Francis Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @linaro.org) Content-Type: text/plain; charset="utf-8" Since 7ecd02a06f8, we are prepared to re-start code generation with a smaller TB if a relocation is out of range. We no longer need to leave a nop in the stream Just In Case. Reviewed-by: Alistair Francis Signed-off-by: Richard Henderson --- tcg/riscv/tcg-target.c.inc | 56 ++++---------------------------------- 1 file changed, 6 insertions(+), 50 deletions(-) diff --git a/tcg/riscv/tcg-target.c.inc b/tcg/riscv/tcg-target.c.inc index 5b4c500a4b..34bee9c5a7 100644 --- a/tcg/riscv/tcg-target.c.inc +++ b/tcg/riscv/tcg-target.c.inc @@ -469,43 +469,16 @@ static bool reloc_call(tcg_insn_unit *code_ptr, const= tcg_insn_unit *target) static bool patch_reloc(tcg_insn_unit *code_ptr, int type, intptr_t value, intptr_t addend) { - uint32_t insn =3D *code_ptr; - intptr_t diff; - bool short_jmp; - tcg_debug_assert(addend =3D=3D 0); - switch (type) { case R_RISCV_BRANCH: - diff =3D value - (uintptr_t)code_ptr; - short_jmp =3D diff =3D=3D sextreg(diff, 0, 12); - if (short_jmp) { - return reloc_sbimm12(code_ptr, (tcg_insn_unit *)value); - } else { - /* Invert the condition */ - insn =3D insn ^ (1 << 12); - /* Clear the offset */ - insn &=3D 0x01fff07f; - /* Set the offset to the PC + 8 */ - insn |=3D encode_sbimm12(8); - - /* Move forward */ - code_ptr[0] =3D insn; - - /* Overwrite the NOP with jal x0,value */ - diff =3D value - (uintptr_t)(code_ptr + 1); - insn =3D encode_uj(OPC_JAL, TCG_REG_ZERO, diff); - code_ptr[1] =3D insn; - - return true; - } - break; + return reloc_sbimm12(code_ptr, (tcg_insn_unit *)value); case R_RISCV_JAL: return reloc_jimm20(code_ptr, (tcg_insn_unit *)value); case R_RISCV_CALL: return reloc_call(code_ptr, (tcg_insn_unit *)value); default: - tcg_abort(); + g_assert_not_reached(); } } =20 @@ -779,21 +752,8 @@ static void tcg_out_brcond(TCGContext *s, TCGCond cond= , TCGReg arg1, arg2 =3D t; } =20 - if (l->has_value) { - intptr_t diff =3D tcg_pcrel_diff(s, l->u.value_ptr); - if (diff =3D=3D sextreg(diff, 0, 12)) { - tcg_out_opc_branch(s, op, arg1, arg2, diff); - } else { - /* Invert the conditional branch. */ - tcg_out_opc_branch(s, op ^ (1 << 12), arg1, arg2, 8); - tcg_out_opc_jump(s, OPC_JAL, TCG_REG_ZERO, diff - 4); - } - } else { - tcg_out_reloc(s, s->code_ptr, R_RISCV_BRANCH, l, 0); - tcg_out_opc_branch(s, op, arg1, arg2, 0); - /* NOP to allow patching later */ - tcg_out_opc_imm(s, OPC_ADDI, TCG_REG_ZERO, TCG_REG_ZERO, 0); - } + tcg_out_reloc(s, s->code_ptr, R_RISCV_BRANCH, l, 0); + tcg_out_opc_branch(s, op, arg1, arg2, 0); } =20 static void tcg_out_setcond(TCGContext *s, TCGCond cond, TCGReg ret, @@ -1009,8 +969,6 @@ static void tcg_out_tlb_load(TCGContext *s, TCGReg add= rl, /* Compare masked address with the TLB entry. */ label_ptr[0] =3D s->code_ptr; tcg_out_opc_branch(s, OPC_BNE, TCG_REG_TMP0, TCG_REG_TMP1, 0); - /* NOP to allow patching later */ - tcg_out_opc_imm(s, OPC_ADDI, TCG_REG_ZERO, TCG_REG_ZERO, 0); =20 /* TLB Hit - translate address using addend. */ if (TCG_TARGET_REG_BITS > TARGET_LONG_BITS) { @@ -1054,8 +1012,7 @@ static bool tcg_out_qemu_ld_slow_path(TCGContext *s, = TCGLabelQemuLdst *l) } =20 /* resolve label address */ - if (!patch_reloc(l->label_ptr[0], R_RISCV_BRANCH, - (intptr_t) s->code_ptr, 0)) { + if (!reloc_sbimm12(l->label_ptr[0], s->code_ptr)) { return false; } =20 @@ -1089,8 +1046,7 @@ static bool tcg_out_qemu_st_slow_path(TCGContext *s, = TCGLabelQemuLdst *l) } =20 /* resolve label address */ - if (!patch_reloc(l->label_ptr[0], R_RISCV_BRANCH, - (intptr_t) s->code_ptr, 0)) { + if (!reloc_sbimm12(l->label_ptr[0], s->code_ptr)) { return false; } =20 --=20 2.25.1