From patchwork Fri Jun 3 18:43:13 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aleksandar Markovic X-Patchwork-Id: 9153911 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id EF3136082E for ; Fri, 3 Jun 2016 18:49:56 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E3F91282ED for ; Fri, 3 Jun 2016 18:49:56 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D5F2128336; Fri, 3 Jun 2016 18:49:56 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id EE297282ED for ; Fri, 3 Jun 2016 18:49:55 +0000 (UTC) Received: from localhost ([::1]:57216 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b8uAM-0006Bu-EZ for patchwork-qemu-devel@patchwork.kernel.org; Fri, 03 Jun 2016 14:49:54 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42241) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b8u5c-00024N-IM for qemu-devel@nongnu.org; Fri, 03 Jun 2016 14:45:03 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1b8u5a-0007gv-CK for qemu-devel@nongnu.org; Fri, 03 Jun 2016 14:44:59 -0400 Received: from mx2.rt-rk.com ([89.216.37.149]:39773 helo=mail.rt-rk.com) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b8u5Z-0007gZ-WE for qemu-devel@nongnu.org; Fri, 03 Jun 2016 14:44:58 -0400 Received: from localhost (localhost [127.0.0.1]) by mail.rt-rk.com (Postfix) with ESMTP id 0B7401A463B; Fri, 3 Jun 2016 20:44:56 +0200 (CEST) X-Virus-Scanned: amavisd-new at rt-rk.com Received: from rtrkw197-lin.domain.local (rtrkw197-lin.domain.local [10.10.13.82]) by mail.rt-rk.com (Postfix) with ESMTPSA id E84091A4532; Fri, 3 Jun 2016 20:44:55 +0200 (CEST) From: Aleksandar Markovic To: qemu-devel@nongnu.org, leon.alrae@imgtec.com, petar.jovanovic@imgtec.com, miodrag.dinic@imgtec.com, aleksandar.markovic@imgtec.com Date: Fri, 3 Jun 2016 20:43:13 +0200 Message-Id: <1464979398-16838-8-git-send-email-aleksandar.markovic@rt-rk.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1464979398-16838-1-git-send-email-aleksandar.markovic@rt-rk.com> References: <1464979398-16838-1-git-send-email-aleksandar.markovic@rt-rk.com> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 89.216.37.149 Subject: [Qemu-devel] [PATCH v8 7/9] target-mips: Add abs2008 flavor of . 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: , Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: Aleksandar Markovic Updated handling of instructions .. Note that legacy (pre-abs2008) ABS and NEG instructions are arithmetic (and, therefore, any NaN operand causes signaling invalid operation), while abs2008 ones are non-arithmetic, always and only changing the sign bit, even for NaN-like operands. Details on these instructions are documented in [1] p. 35 and 359. Implementation-wise, abs2008 versions are implemented without helpers, for simplicity and performance sake. [1] "MIPS Architecture For Programmers Volume II-A: The MIPS64 Instruction Set Reference Manual", Imagination Technologies LTD, Revision 6.04, November 13, 2015 Reviewed-by: Leon Alrae Signed-off-by: Thomas Schwinge Signed-off-by: Maciej W. Rozycki Signed-off-by: Aleksandar Markovic --- target-mips/translate.c | 26 ++++++++++++++++++++++---- 1 file changed, 22 insertions(+), 4 deletions(-) diff --git a/target-mips/translate.c b/target-mips/translate.c index e934884..6771254 100644 --- a/target-mips/translate.c +++ b/target-mips/translate.c @@ -1434,6 +1434,7 @@ typedef struct DisasContext { bool vp; bool cmgcr; bool mrp; + bool abs2008; } DisasContext; enum { @@ -8879,7 +8880,11 @@ static void gen_farith (DisasContext *ctx, enum fopcode op1, TCGv_i32 fp0 = tcg_temp_new_i32(); gen_load_fpr32(ctx, fp0, fs); - gen_helper_float_abs_s(fp0, fp0); + if (ctx->abs2008) { + tcg_gen_andi_i32(fp0, fp0, 0x7fffffffUL); + } else { + gen_helper_float_abs_s(fp0, fp0); + } gen_store_fpr32(ctx, fp0, fd); tcg_temp_free_i32(fp0); } @@ -8898,7 +8903,11 @@ static void gen_farith (DisasContext *ctx, enum fopcode op1, TCGv_i32 fp0 = tcg_temp_new_i32(); gen_load_fpr32(ctx, fp0, fs); - gen_helper_float_chs_s(fp0, fp0); + if (ctx->abs2008) { + tcg_gen_xori_i32(fp0, fp0, 1UL << 31); + } else { + gen_helper_float_chs_s(fp0, fp0); + } gen_store_fpr32(ctx, fp0, fd); tcg_temp_free_i32(fp0); } @@ -9369,7 +9378,11 @@ static void gen_farith (DisasContext *ctx, enum fopcode op1, TCGv_i64 fp0 = tcg_temp_new_i64(); gen_load_fpr64(ctx, fp0, fs); - gen_helper_float_abs_d(fp0, fp0); + if (ctx->abs2008) { + tcg_gen_andi_i64(fp0, fp0, 0x7fffffffffffffffULL); + } else { + gen_helper_float_abs_d(fp0, fp0); + } gen_store_fpr64(ctx, fp0, fd); tcg_temp_free_i64(fp0); } @@ -9390,7 +9403,11 @@ static void gen_farith (DisasContext *ctx, enum fopcode op1, TCGv_i64 fp0 = tcg_temp_new_i64(); gen_load_fpr64(ctx, fp0, fs); - gen_helper_float_chs_d(fp0, fp0); + if (ctx->abs2008) { + tcg_gen_xori_i64(fp0, fp0, 1ULL << 63); + } else { + gen_helper_float_chs_d(fp0, fp0); + } gen_store_fpr64(ctx, fp0, fd); tcg_temp_free_i64(fp0); } @@ -19775,6 +19792,7 @@ void gen_intermediate_code(CPUMIPSState *env, struct TranslationBlock *tb) (env->insn_flags & (INSN_LOONGSON2E | INSN_LOONGSON2F)); ctx.vp = (env->CP0_Config5 >> CP0C5_VP) & 1; ctx.mrp = (env->CP0_Config5 >> CP0C5_MRP) & 1; + ctx.abs2008 = (env->active_fpu.fcr31 >> FCR31_ABS2008) & 1; restore_cpu_state(env, &ctx); #ifdef CONFIG_USER_ONLY ctx.mem_idx = MIPS_HFLAG_UM;