From patchwork Sun Oct 21 15:42:08 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fredrik Noring X-Patchwork-Id: 987350 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=2001:4830:134:3::11; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=nocrew.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 42dPNr1pR2z9s3T for ; Mon, 22 Oct 2018 02:54:52 +1100 (AEDT) Received: from localhost ([::1]:59366 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gEG41-0001bJ-SX for incoming@patchwork.ozlabs.org; Sun, 21 Oct 2018 11:54:49 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:47010) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gEFs3-0006wZ-7M for qemu-devel@nongnu.org; Sun, 21 Oct 2018 11:42:28 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gEFs0-00060Z-1A for qemu-devel@nongnu.org; Sun, 21 Oct 2018 11:42:27 -0400 Received: from pio-pvt-msa1.bahnhof.se ([79.136.2.40]:35307) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gEFrx-0005v8-Ur for qemu-devel@nongnu.org; Sun, 21 Oct 2018 11:42:23 -0400 Received: from localhost (localhost [127.0.0.1]) by pio-pvt-msa1.bahnhof.se (Postfix) with ESMTP id 2A0D83F4DB; Sun, 21 Oct 2018 17:42:14 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at bahnhof.se Received: from pio-pvt-msa1.bahnhof.se ([127.0.0.1]) by localhost (pio-pvt-msa1.bahnhof.se [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id gWjRVegRroJu; Sun, 21 Oct 2018 17:42:09 +0200 (CEST) Received: from localhost (h-41-252.A163.priv.bahnhof.se [46.59.41.252]) (Authenticated sender: mb547485) by pio-pvt-msa1.bahnhof.se (Postfix) with ESMTPA id D1AA13F3A9; Sun, 21 Oct 2018 17:42:08 +0200 (CEST) Date: Sun, 21 Oct 2018 17:42:08 +0200 From: Fredrik Noring To: Aleksandar Markovic , "Maciej W. Rozycki" , Philippe =?utf-8?q?Mathieu-Daud=C3=A9?= Message-ID: <661b6682ef12a7bc022215f60f8cb62803c90833.1540134919.git.noring@nocrew.org> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 79.136.2.40 Subject: [Qemu-devel] [PATCH v8 31/38] tests/tcg/mips: Test R5900 DIV1 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , Richard Henderson , qemu-devel@nongnu.org, =?utf-8?b?SsO8?= =?utf-8?q?rgen?= Urban , Petar Jovanovic , Aurelien Jarno Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: Fredrik Noring --- tests/tcg/mips/mipsr5900/Makefile | 3 +- tests/tcg/mips/mipsr5900/div1.c | 73 +++++++++++++++++++++++++++++++ 2 files changed, 75 insertions(+), 1 deletion(-) create mode 100644 tests/tcg/mips/mipsr5900/div1.c diff --git a/tests/tcg/mips/mipsr5900/Makefile b/tests/tcg/mips/mipsr5900/Makefile index 287c248f6d..757eb83862 100644 --- a/tests/tcg/mips/mipsr5900/Makefile +++ b/tests/tcg/mips/mipsr5900/Makefile @@ -8,7 +8,8 @@ SIM_FLAGS=-cpu R5900 CC = $(CROSS)gcc CFLAGS = -Wall -mabi=32 -march=r5900 -static -TESTCASES = mflohi1.tst +TESTCASES = div1.tst +TESTCASES += mflohi1.tst TESTCASES += mtlohi1.tst TESTCASES += mult.tst TESTCASES += multu.tst diff --git a/tests/tcg/mips/mipsr5900/div1.c b/tests/tcg/mips/mipsr5900/div1.c new file mode 100644 index 0000000000..83dafa018b --- /dev/null +++ b/tests/tcg/mips/mipsr5900/div1.c @@ -0,0 +1,73 @@ +/* + * Test R5900-specific DIV1. + */ + +#include +#include +#include + +struct quotient_remainder { int32_t quotient, remainder; }; + +static struct quotient_remainder div1(int32_t rs, int32_t rt) +{ + int32_t lo, hi; + + __asm__ __volatile__ ( + " div1 $0, %2, %3\n" + " mflo1 %0\n" + " mfhi1 %1\n" + : "=r" (lo), "=r" (hi) + : "r" (rs), "r" (rt)); + + assert(rs / rt == lo); + assert(rs % rt == hi); + + return (struct quotient_remainder) { .quotient = lo, .remainder = hi }; +} + +static void verify_div1(int32_t rs, int32_t rt, + int32_t expected_quotient, + int32_t expected_remainder) +{ + struct quotient_remainder qr = div1(rs, rt); + + assert(qr.quotient == expected_quotient); + assert(qr.remainder == expected_remainder); +} + +static void verify_div1_negations(int32_t rs, int32_t rt, + int32_t expected_quotient, + int32_t expected_remainder) +{ + verify_div1(rs, rt, expected_quotient, expected_remainder); + verify_div1(rs, -rt, -expected_quotient, expected_remainder); + verify_div1(-rs, rt, -expected_quotient, -expected_remainder); + verify_div1(-rs, -rt, expected_quotient, -expected_remainder); +} + +int main() +{ + verify_div1_negations(0, 1, 0, 0); + verify_div1_negations(1, 1, 1, 0); + verify_div1_negations(1, 2, 0, 1); + verify_div1_negations(17, 19, 0, 17); + verify_div1_negations(19, 17, 1, 2); + verify_div1_negations(77773, 101, 770, 3); + + verify_div1(-0x80000000, 1, -0x80000000, 0); + + /* + * Supplementary explanation from the Toshiba TX System RISC TX79 Core + * Architecture manual, A-38 and B-7, https://wiki.qemu.org/File:C790.pdf + * + * Normally, when 0x80000000 (-2147483648) the signed minimum value is + * divided by 0xFFFFFFFF (-1), the operation will result in an overflow. + * However, in this instruction an overflow exception doesn't occur and + * the result will be as follows: + * + * Quotient is 0x80000000 (-2147483648), and remainder is 0x00000000 (0). + */ + verify_div1(-0x80000000, -1, -0x80000000, 0); + + return 0; +}