From patchwork Tue Oct 20 18:55:33 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Richard Henderson X-Patchwork-Id: 1385172 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256 header.s=google header.b=BeVPdg/J; dkim-atps=neutral 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 ozlabs.org (Postfix) with ESMTPS id 4CG2zV2BzYz9sSC for ; Wed, 21 Oct 2020 06:01:38 +1100 (AEDT) Received: from localhost ([::1]:42244 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kUwt4-0007Jr-On for incoming@patchwork.ozlabs.org; Tue, 20 Oct 2020 15:01:34 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:60212) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kUwnT-0001sY-DG for qemu-devel@nongnu.org; Tue, 20 Oct 2020 14:55:48 -0400 Received: from mail-pl1-x629.google.com ([2607:f8b0:4864:20::629]:44739) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1kUwnO-0004Fm-Uf for qemu-devel@nongnu.org; Tue, 20 Oct 2020 14:55:47 -0400 Received: by mail-pl1-x629.google.com with SMTP id h2so1489948pll.11 for ; Tue, 20 Oct 2020 11:55:41 -0700 (PDT) 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=LXyN5m1R7YUWSPWrPcd4RM3WNmdyUMYrgbTr/k3ruOw=; b=BeVPdg/Jr2s/Rk2+yGQ+PRpYMe3hUc5x75LQScetkB8Kx/EPnZ6HG/tdMo362+8iLn fPC27dj7Ivg4TMHJR/V/xNsiT4+9+Su+pln6ucyo8UZLNZIwihYOqHZSzGFfeH34j769 WeP7ZNrq0jDM6t/EnadflzxLB06e27DbLOXOdPQM1uc++NnYVCg/wgKzjIu9PJsHHVyP qh2vyjKuJ8dwxnVPCHLRq73OsRsFzI40sZ9cvPGvUq6MOvOKjNBVHrZQoiJGPRoTa/Pb QoVk/ZAVFONp8uKcT5z/Gw6y7t1PqgEBPQUE/AzzjNaJ0VYTWbw5jQXwiJkO/9yCd0Ec WeHA== 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=LXyN5m1R7YUWSPWrPcd4RM3WNmdyUMYrgbTr/k3ruOw=; b=QEETMAhMbjVmjjizcNPT4+T2avZsUqO8BapEpeoVs8PEo+h8CR6PmVwFYFE0GjsWeS hiGhF/jIIAIll+VKrudFLddOPIVHulZT5ZGtDzimqXeaLd4Dbbu6IKbYv3kV90GN3V7F JwVRNLFUq/wOMIyDuKdFlrwr9yHxXJrVxknwK8ahM4aUWjXp21gU9IPdIeK2I9TgY06a 4yR+8sRd4AY3QY+JjZAx3c5R8yMoPTeqs9SZJCpznnXbxG833iwQFVTvFyDjEOHr6tb3 4nqLGozxU9ro/TLUR81TNfllxbs2MMATJldx0APgXtdpnfTQjr0fpzbHADjSPJuBPS/E 6aLg== X-Gm-Message-State: AOAM5329hKhWQ57MMtqCksW8onrr61O3ClOMVJRICx1gztA25wVatuM5 dXizD9tpVd7fwDkgXvfuQ26FWs/meHFJJg== X-Google-Smtp-Source: ABdhPJykRfudsNk2ruaqTQ3uFRNIHVzeLDp7A9lsUSwqPDynaDE0vGFokJYpAwYj11kkv4nEHgBw5w== X-Received: by 2002:a17:902:b7c3:b029:d4:bc6e:8aae with SMTP id v3-20020a170902b7c3b02900d4bc6e8aaemr1352912plz.12.1603220140334; Tue, 20 Oct 2020 11:55:40 -0700 (PDT) Received: from localhost.localdomain ([71.212.141.89]) by smtp.gmail.com with ESMTPSA id y22sm2988962pgj.27.2020.10.20.11.55.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 Oct 2020 11:55:39 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH v2 4/4] target/s390x: Improve SUB LOGICAL WITH BORROW Date: Tue, 20 Oct 2020 11:55:33 -0700 Message-Id: <20201020185533.1508487-5-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201020185533.1508487-1-richard.henderson@linaro.org> References: <20201020185533.1508487-1-richard.henderson@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::629; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x629.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. 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: david@redhat.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Now that SUB LOGICAL outputs borrow, we can use that as input directly. It also means we can re-use CC_OP_SUBU and produce an output borrow directly from SUB LOGICAL WITH BORROW. Signed-off-by: Richard Henderson Reviewed-by: David Hildenbrand --- target/s390x/internal.h | 2 - target/s390x/cc_helper.c | 32 ---------------- target/s390x/helper.c | 2 - target/s390x/translate.c | 76 +++++++++++++++++++++----------------- target/s390x/insn-data.def | 8 ++-- 5 files changed, 46 insertions(+), 74 deletions(-) diff --git a/target/s390x/internal.h b/target/s390x/internal.h index 4077047494..11515bb617 100644 --- a/target/s390x/internal.h +++ b/target/s390x/internal.h @@ -172,14 +172,12 @@ enum cc_op { CC_OP_ADD_64, /* overflow on add (64bit) */ CC_OP_SUB_64, /* overflow on subtraction (64bit) */ - CC_OP_SUBB_64, /* overflow on unsigned sub-borrow (64bit) */ CC_OP_ABS_64, /* sign eval on abs (64bit) */ CC_OP_NABS_64, /* sign eval on nabs (64bit) */ CC_OP_MULS_64, /* overflow on signed multiply (64bit) */ CC_OP_ADD_32, /* overflow on add (32bit) */ CC_OP_SUB_32, /* overflow on subtraction (32bit) */ - CC_OP_SUBB_32, /* overflow on unsigned sub-borrow (32bit) */ CC_OP_ABS_32, /* sign eval on abs (64bit) */ CC_OP_NABS_32, /* sign eval on nabs (64bit) */ CC_OP_MULS_32, /* overflow on signed multiply (32bit) */ diff --git a/target/s390x/cc_helper.c b/target/s390x/cc_helper.c index c7728d1225..e7039d0d18 100644 --- a/target/s390x/cc_helper.c +++ b/target/s390x/cc_helper.c @@ -164,19 +164,6 @@ static uint32_t cc_calc_sub_64(int64_t a1, int64_t a2, int64_t ar) } } -static uint32_t cc_calc_subb_64(uint64_t a1, uint64_t a2, uint64_t ar) -{ - int borrow_out; - - if (ar != a1 - a2) { /* difference means borrow-in */ - borrow_out = (a2 >= a1); - } else { - borrow_out = (a2 > a1); - } - - return (ar != 0) + 2 * !borrow_out; -} - static uint32_t cc_calc_abs_64(int64_t dst) { if ((uint64_t)dst == 0x8000000000000000ULL) { @@ -237,19 +224,6 @@ static uint32_t cc_calc_sub_32(int32_t a1, int32_t a2, int32_t ar) } } -static uint32_t cc_calc_subb_32(uint32_t a1, uint32_t a2, uint32_t ar) -{ - int borrow_out; - - if (ar != a1 - a2) { /* difference means borrow-in */ - borrow_out = (a2 >= a1); - } else { - borrow_out = (a2 > a1); - } - - return (ar != 0) + 2 * !borrow_out; -} - static uint32_t cc_calc_abs_32(int32_t dst) { if ((uint32_t)dst == 0x80000000UL) { @@ -450,9 +424,6 @@ static uint32_t do_calc_cc(CPUS390XState *env, uint32_t cc_op, case CC_OP_SUB_64: r = cc_calc_sub_64(src, dst, vr); break; - case CC_OP_SUBB_64: - r = cc_calc_subb_64(src, dst, vr); - break; case CC_OP_ABS_64: r = cc_calc_abs_64(dst); break; @@ -472,9 +443,6 @@ static uint32_t do_calc_cc(CPUS390XState *env, uint32_t cc_op, case CC_OP_SUB_32: r = cc_calc_sub_32(src, dst, vr); break; - case CC_OP_SUBB_32: - r = cc_calc_subb_32(src, dst, vr); - break; case CC_OP_ABS_32: r = cc_calc_abs_32(dst); break; diff --git a/target/s390x/helper.c b/target/s390x/helper.c index fa3aa500e5..7678994feb 100644 --- a/target/s390x/helper.c +++ b/target/s390x/helper.c @@ -405,12 +405,10 @@ const char *cc_name(enum cc_op cc_op) [CC_OP_LTGT0_64] = "CC_OP_LTGT0_64", [CC_OP_ADD_64] = "CC_OP_ADD_64", [CC_OP_SUB_64] = "CC_OP_SUB_64", - [CC_OP_SUBB_64] = "CC_OP_SUBB_64", [CC_OP_ABS_64] = "CC_OP_ABS_64", [CC_OP_NABS_64] = "CC_OP_NABS_64", [CC_OP_ADD_32] = "CC_OP_ADD_32", [CC_OP_SUB_32] = "CC_OP_SUB_32", - [CC_OP_SUBB_32] = "CC_OP_SUBB_32", [CC_OP_ABS_32] = "CC_OP_ABS_32", [CC_OP_NABS_32] = "CC_OP_NABS_32", [CC_OP_COMP_32] = "CC_OP_COMP_32", diff --git a/target/s390x/translate.c b/target/s390x/translate.c index be0532d5dc..cd062c2be8 100644 --- a/target/s390x/translate.c +++ b/target/s390x/translate.c @@ -601,10 +601,8 @@ static void gen_op_calc_cc(DisasContext *s) /* FALLTHRU */ case CC_OP_ADD_64: case CC_OP_SUB_64: - case CC_OP_SUBB_64: case CC_OP_ADD_32: case CC_OP_SUB_32: - case CC_OP_SUBB_32: local_cc_op = tcg_const_i32(s->cc_op); break; case CC_OP_CONST0: @@ -663,10 +661,8 @@ static void gen_op_calc_cc(DisasContext *s) break; case CC_OP_ADD_64: case CC_OP_SUB_64: - case CC_OP_SUBB_64: case CC_OP_ADD_32: case CC_OP_SUB_32: - case CC_OP_SUBB_32: /* 3 arguments */ gen_helper_calc_cc(cc_op, cpu_env, local_cc_op, cc_src, cc_dst, cc_vr); break; @@ -4745,29 +4741,51 @@ static DisasJumpType op_subu64(DisasContext *s, DisasOps *o) return DISAS_NEXT; } -static DisasJumpType op_subb(DisasContext *s, DisasOps *o) +/* Compute borrow (0, -1) into cc_src. */ +static void compute_borrow(DisasContext *s) { - DisasCompare cmp; - TCGv_i64 borrow; - - tcg_gen_sub_i64(o->out, o->in1, o->in2); - - /* The !borrow flag is the msb of CC. Since we want the inverse of - that, we ask for a comparison of CC=0 | CC=1 -> mask of 8 | 4. */ - disas_jcc(s, &cmp, 8 | 4); - borrow = tcg_temp_new_i64(); - if (cmp.is_64) { - tcg_gen_setcond_i64(cmp.cond, borrow, cmp.u.s64.a, cmp.u.s64.b); - } else { - TCGv_i32 t = tcg_temp_new_i32(); - tcg_gen_setcond_i32(cmp.cond, t, cmp.u.s32.a, cmp.u.s32.b); - tcg_gen_extu_i32_i64(borrow, t); - tcg_temp_free_i32(t); + switch (s->cc_op) { + case CC_OP_SUBU: + /* The borrow value is already in cc_src (0,-1). */ + break; + default: + gen_op_calc_cc(s); + /* fall through */ + case CC_OP_STATIC: + /* The carry flag is the msb of CC; compute into cc_src. */ + tcg_gen_extu_i32_i64(cc_src, cc_op); + tcg_gen_shri_i64(cc_src, cc_src, 1); + /* fall through */ + case CC_OP_ADDU: + /* Convert carry (1,0) to borrow (0,-1). */ + tcg_gen_subi_i64(cc_src, cc_src, 1); + break; } - free_compare(&cmp); +} + +static DisasJumpType op_subb32(DisasContext *s, DisasOps *o) +{ + compute_borrow(s); + + /* Borrow is {0, -1}, so add to subtract. */ + tcg_gen_add_i64(o->out, o->in1, cc_src); + tcg_gen_sub_i64(o->out, o->out, o->in2); + return DISAS_NEXT; +} + +static DisasJumpType op_subb64(DisasContext *s, DisasOps *o) +{ + compute_borrow(s); + + /* + * Borrow is {0, -1}, so add to subtract; replicate the + * borrow input to produce 128-bit -1 for the addition. + */ + TCGv_i64 zero = tcg_const_i64(0); + tcg_gen_add2_i64(o->out, cc_src, o->in1, zero, cc_src, cc_src); + tcg_gen_sub2_i64(o->out, cc_src, o->out, cc_src, o->in2, zero); + tcg_temp_free_i64(zero); - tcg_gen_sub_i64(o->out, o->out, borrow); - tcg_temp_free_i64(borrow); return DISAS_NEXT; } @@ -5306,16 +5324,6 @@ static void cout_subu64(DisasContext *s, DisasOps *o) gen_op_update2_cc_i64(s, CC_OP_SUBU, cc_src, o->out); } -static void cout_subb32(DisasContext *s, DisasOps *o) -{ - gen_op_update3_cc_i64(s, CC_OP_SUBB_32, o->in1, o->in2, o->out); -} - -static void cout_subb64(DisasContext *s, DisasOps *o) -{ - gen_op_update3_cc_i64(s, CC_OP_SUBB_64, o->in1, o->in2, o->out); -} - static void cout_tm32(DisasContext *s, DisasOps *o) { gen_op_update2_cc_i64(s, CC_OP_TM_32, o->in1, o->in2); diff --git a/target/s390x/insn-data.def b/target/s390x/insn-data.def index 65ee998484..d91051843c 100644 --- a/target/s390x/insn-data.def +++ b/target/s390x/insn-data.def @@ -916,10 +916,10 @@ C(0xc205, SLFI, RIL_a, EI, r1_32u, i2_32u, new, r1_32, sub, subu32) C(0xc204, SLGFI, RIL_a, EI, r1, i2_32u, r1, 0, subu64, subu64) /* SUBTRACT LOGICAL WITH BORROW */ - C(0xb999, SLBR, RRE, Z, r1, r2, new, r1_32, subb, subb32) - C(0xb989, SLBGR, RRE, Z, r1, r2, r1, 0, subb, subb64) - C(0xe399, SLB, RXY_a, Z, r1, m2_32u, new, r1_32, subb, subb32) - C(0xe389, SLBG, RXY_a, Z, r1, m2_64, r1, 0, subb, subb64) + C(0xb999, SLBR, RRE, Z, r1_32u, r2_32u, new, r1_32, subb32, subu32) + C(0xb989, SLBGR, RRE, Z, r1, r2, r1, 0, subb64, subu64) + C(0xe399, SLB, RXY_a, Z, r1_32u, m2_32u, new, r1_32, subb32, subu32) + C(0xe389, SLBG, RXY_a, Z, r1, m2_64, r1, 0, subb64, subu64) /* SUPERVISOR CALL */ C(0x0a00, SVC, I, Z, 0, 0, 0, 0, svc, 0)