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[209.51.188.17]) by mx.google.com with ESMTPS id w15si18057392ybe.101.2020.12.22.02.49.09 for (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Tue, 22 Dec 2020 02:49:09 -0800 (PST) Received-SPF: pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; Authentication-Results: mx.google.com; dkim=fail header.i=@redhat.com header.s=mimecast20190719 header.b=cJzFVz5I; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-devel-bounces+patch=linaro.org@nongnu.org"; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from localhost ([::1]:58544 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1krfE4-000067-Jc for patch@linaro.org; Tue, 22 Dec 2020 05:49:08 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:38496) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1krfAU-0004vK-L9 for qemu-devel@nongnu.org; Tue, 22 Dec 2020 05:45:26 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:56927) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1krfAR-00076i-UE for qemu-devel@nongnu.org; Tue, 22 Dec 2020 05:45:26 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1608633923; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=n3L60d31a37E+85XqniaJiMb9ylPMDA8EGVgiO5wv2c=; b=cJzFVz5IZNS5TxmITl5rxoDReTETwnQwlF9pfxpTKusdRPx8G/V/wlofi0tNIgxx8ZJPUf CYBqKhz1YjNm/90Yi503Bu/D5+/5p6NSyZTfafpnditr7usGhaBynZqvCxUEpZZG0YUlc/ wTFjzJFqeluEjLqzsTRXd/of6dqeyTM= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-237-jxIvSRM3PaC4-lGyyD27jQ-1; Tue, 22 Dec 2020 05:45:18 -0500 X-MC-Unique: jxIvSRM3PaC4-lGyyD27jQ-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 990CC107ACE4; Tue, 22 Dec 2020 10:45:17 +0000 (UTC) Received: from gondolin.redhat.com (ovpn-113-192.ams2.redhat.com [10.36.113.192]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3D44A7B130; Tue, 22 Dec 2020 10:45:16 +0000 (UTC) From: Cornelia Huck To: Peter Maydell Subject: [PULL 06/14] target/s390x: Improve cc computation for SUBTRACT LOGICAL Date: Tue, 22 Dec 2020 11:44:55 +0100 Message-Id: <20201222104503.224510-7-cohuck@redhat.com> In-Reply-To: <20201222104503.224510-1-cohuck@redhat.com> References: <20201222104503.224510-1-cohuck@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=cohuck@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=216.205.24.124; envelope-from=cohuck@redhat.com; helo=us-smtp-delivery-124.mimecast.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, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable 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: qemu-s390x@nongnu.org, Cornelia Huck , Richard Henderson , qemu-devel@nongnu.org, David Hildenbrand Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: "Qemu-devel" From: Richard Henderson The resulting cc is only dependent on the result and the carry-out. Carry-out and borrow-out are inverses, so are trivially converted. With tcg ops, it is easier to compute borrow-out than carry-out, so save result and borrow-out rather than the inputs. Borrow-out for 64-bit inputs is had via tcg_gen_sub2_i64 directly into cc_src. Borrow-out for 32-bit inputs is had via extraction from a normal 64-bit sub (with zero-extended inputs). Reviewed-by: David Hildenbrand Signed-off-by: Richard Henderson Message-Id: <20201214221356.68039-4-richard.henderson@linaro.org> Signed-off-by: Cornelia Huck --- target/s390x/cc_helper.c | 40 ++++++--------------------- target/s390x/helper.c | 3 +-- target/s390x/insn-data.def | 24 ++++++++--------- target/s390x/internal.h | 3 +-- target/s390x/translate.c | 55 +++++++++++++++----------------------- 5 files changed, 43 insertions(+), 82 deletions(-) -- 2.26.2 diff --git a/target/s390x/cc_helper.c b/target/s390x/cc_helper.c index cd2c5c4b39a4..c7728d1225a3 100644 --- a/target/s390x/cc_helper.c +++ b/target/s390x/cc_helper.c @@ -129,6 +129,11 @@ static uint32_t cc_calc_addu(uint64_t carry_out, uint64_t result) return (result != 0) + 2 * carry_out; } +static uint32_t cc_calc_subu(uint64_t borrow_out, uint64_t result) +{ + return cc_calc_addu(borrow_out + 1, result); +} + static uint32_t cc_calc_add_64(int64_t a1, int64_t a2, int64_t ar) { if ((a1 > 0 && a2 > 0 && ar < 0) || (a1 < 0 && a2 < 0 && ar > 0)) { @@ -159,19 +164,6 @@ static uint32_t cc_calc_sub_64(int64_t a1, int64_t a2, int64_t ar) } } -static uint32_t cc_calc_subu_64(uint64_t a1, uint64_t a2, uint64_t ar) -{ - if (ar == 0) { - return 2; - } else { - if (a2 > a1) { - return 1; - } else { - return 3; - } - } -} - static uint32_t cc_calc_subb_64(uint64_t a1, uint64_t a2, uint64_t ar) { int borrow_out; @@ -245,19 +237,6 @@ static uint32_t cc_calc_sub_32(int32_t a1, int32_t a2, int32_t ar) } } -static uint32_t cc_calc_subu_32(uint32_t a1, uint32_t a2, uint32_t ar) -{ - if (ar == 0) { - return 2; - } else { - if (a2 > a1) { - return 1; - } else { - return 3; - } - } -} - static uint32_t cc_calc_subb_32(uint32_t a1, uint32_t a2, uint32_t ar) { int borrow_out; @@ -462,15 +441,15 @@ static uint32_t do_calc_cc(CPUS390XState *env, uint32_t cc_op, case CC_OP_ADDU: r = cc_calc_addu(src, dst); break; + case CC_OP_SUBU: + r = cc_calc_subu(src, dst); + break; case CC_OP_ADD_64: r = cc_calc_add_64(src, dst, vr); break; case CC_OP_SUB_64: r = cc_calc_sub_64(src, dst, vr); break; - case CC_OP_SUBU_64: - r = cc_calc_subu_64(src, dst, vr); - break; case CC_OP_SUBB_64: r = cc_calc_subb_64(src, dst, vr); break; @@ -493,9 +472,6 @@ 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_SUBU_32: - r = cc_calc_subu_32(src, dst, vr); - break; case CC_OP_SUBB_32: r = cc_calc_subb_32(src, dst, vr); break; diff --git a/target/s390x/helper.c b/target/s390x/helper.c index 4f4561bc645a..fa3aa500e52f 100644 --- a/target/s390x/helper.c +++ b/target/s390x/helper.c @@ -396,6 +396,7 @@ const char *cc_name(enum cc_op cc_op) [CC_OP_STATIC] = "CC_OP_STATIC", [CC_OP_NZ] = "CC_OP_NZ", [CC_OP_ADDU] = "CC_OP_ADDU", + [CC_OP_SUBU] = "CC_OP_SUBU", [CC_OP_LTGT_32] = "CC_OP_LTGT_32", [CC_OP_LTGT_64] = "CC_OP_LTGT_64", [CC_OP_LTUGTU_32] = "CC_OP_LTUGTU_32", @@ -404,13 +405,11 @@ 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_SUBU_64] = "CC_OP_SUBU_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_SUBU_32] = "CC_OP_SUBU_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", diff --git a/target/s390x/insn-data.def b/target/s390x/insn-data.def index e380723dcd3d..7ff3e7e517e2 100644 --- a/target/s390x/insn-data.def +++ b/target/s390x/insn-data.def @@ -900,21 +900,21 @@ C(0xb9c9, SHHHR, RRF_a, HW, r2_sr32, r3_sr32, new, r1_32h, sub, subs32) C(0xb9d9, SHHLR, RRF_a, HW, r2_sr32, r3, new, r1_32h, sub, subs32) /* SUBTRACT LOGICAL */ - C(0x1f00, SLR, RR_a, Z, r1, r2, new, r1_32, sub, subu32) - C(0xb9fb, SLRK, RRF_a, DO, r2, r3, new, r1_32, sub, subu32) - C(0x5f00, SL, RX_a, Z, r1, m2_32u, new, r1_32, sub, subu32) - C(0xe35f, SLY, RXY_a, LD, r1, m2_32u, new, r1_32, sub, subu32) - C(0xb90b, SLGR, RRE, Z, r1, r2, r1, 0, sub, subu64) - C(0xb91b, SLGFR, RRE, Z, r1, r2_32u, r1, 0, sub, subu64) - C(0xb9eb, SLGRK, RRF_a, DO, r2, r3, r1, 0, sub, subu64) - C(0xe30b, SLG, RXY_a, Z, r1, m2_64, r1, 0, sub, subu64) - C(0xe31b, SLGF, RXY_a, Z, r1, m2_32u, r1, 0, sub, subu64) + C(0x1f00, SLR, RR_a, Z, r1_32u, r2_32u, new, r1_32, sub, subu32) + C(0xb9fb, SLRK, RRF_a, DO, r2_32u, r3_32u, new, r1_32, sub, subu32) + C(0x5f00, SL, RX_a, Z, r1_32u, m2_32u, new, r1_32, sub, subu32) + C(0xe35f, SLY, RXY_a, LD, r1_32u, m2_32u, new, r1_32, sub, subu32) + C(0xb90b, SLGR, RRE, Z, r1, r2, r1, 0, subu64, subu64) + C(0xb91b, SLGFR, RRE, Z, r1, r2_32u, r1, 0, subu64, subu64) + C(0xb9eb, SLGRK, RRF_a, DO, r2, r3, r1, 0, subu64, subu64) + C(0xe30b, SLG, RXY_a, Z, r1, m2_64, r1, 0, subu64, subu64) + C(0xe31b, SLGF, RXY_a, Z, r1, m2_32u, r1, 0, subu64, subu64) /* SUBTRACT LOCICAL HIGH */ C(0xb9cb, SLHHHR, RRF_a, HW, r2_sr32, r3_sr32, new, r1_32h, sub, subu32) - C(0xb9db, SLHHLR, RRF_a, HW, r2_sr32, r3, new, r1_32h, sub, subu32) + C(0xb9db, SLHHLR, RRF_a, HW, r2_sr32, r3_32u, new, r1_32h, sub, subu32) /* SUBTRACT LOGICAL IMMEDIATE */ - C(0xc205, SLFI, RIL_a, EI, r1, i2_32u, new, r1_32, sub, subu32) - C(0xc204, SLGFI, RIL_a, EI, r1, i2_32u, r1, 0, sub, subu64) + 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) diff --git a/target/s390x/internal.h b/target/s390x/internal.h index f5f3ae063ee8..4077047494bd 100644 --- a/target/s390x/internal.h +++ b/target/s390x/internal.h @@ -161,6 +161,7 @@ enum cc_op { CC_OP_NZ, /* env->cc_dst != 0 */ CC_OP_ADDU, /* dst != 0, src = carry out (0,1) */ + CC_OP_SUBU, /* dst != 0, src = borrow out (0,-1) */ CC_OP_LTGT_32, /* signed less/greater than (32bit) */ CC_OP_LTGT_64, /* signed less/greater than (64bit) */ @@ -171,7 +172,6 @@ enum cc_op { CC_OP_ADD_64, /* overflow on add (64bit) */ CC_OP_SUB_64, /* overflow on subtraction (64bit) */ - CC_OP_SUBU_64, /* overflow on unsigned 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) */ @@ -179,7 +179,6 @@ enum cc_op { CC_OP_ADD_32, /* overflow on add (32bit) */ CC_OP_SUB_32, /* overflow on subtraction (32bit) */ - CC_OP_SUBU_32, /* overflow on unsigned 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) */ diff --git a/target/s390x/translate.c b/target/s390x/translate.c index d1d97e469668..40add1df1ffc 100644 --- a/target/s390x/translate.c +++ b/target/s390x/translate.c @@ -601,11 +601,9 @@ static void gen_op_calc_cc(DisasContext *s) /* FALLTHRU */ case CC_OP_ADD_64: case CC_OP_SUB_64: - case CC_OP_SUBU_64: case CC_OP_SUBB_64: case CC_OP_ADD_32: case CC_OP_SUB_32: - case CC_OP_SUBU_32: case CC_OP_SUBB_32: local_cc_op = tcg_const_i32(s->cc_op); break; @@ -656,6 +654,7 @@ static void gen_op_calc_cc(DisasContext *s) case CC_OP_TM_64: case CC_OP_SLA_32: case CC_OP_SLA_64: + case CC_OP_SUBU: case CC_OP_NZ_F128: case CC_OP_VC: case CC_OP_MULS_64: @@ -664,11 +663,9 @@ static void gen_op_calc_cc(DisasContext *s) break; case CC_OP_ADD_64: case CC_OP_SUB_64: - case CC_OP_SUBU_64: case CC_OP_SUBB_64: case CC_OP_ADD_32: case CC_OP_SUB_32: - case CC_OP_SUBU_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); @@ -843,6 +840,7 @@ static void disas_jcc(DisasContext *s, DisasCompare *c, uint32_t mask) break; case CC_OP_ADDU: + case CC_OP_SUBU: switch (mask) { case 8 | 2: /* result == 0 */ cond = TCG_COND_EQ; @@ -850,33 +848,11 @@ static void disas_jcc(DisasContext *s, DisasCompare *c, uint32_t mask) case 4 | 1: /* result != 0 */ cond = TCG_COND_NE; break; - case 8 | 4: /* no carry */ - cond = TCG_COND_EQ; + case 8 | 4: /* !carry (borrow) */ + cond = old_cc_op == CC_OP_ADDU ? TCG_COND_EQ : TCG_COND_NE; break; - case 2 | 1: /* carry */ - cond = TCG_COND_NE; - break; - default: - goto do_dynamic; - } - account_inline_branch(s, old_cc_op); - break; - - case CC_OP_SUBU_32: - case CC_OP_SUBU_64: - /* Note that CC=0 is impossible; treat it as dont-care. */ - switch (mask & 7) { - case 2: /* zero -> op1 == op2 */ - cond = TCG_COND_EQ; - break; - case 4 | 1: /* !zero -> op1 != op2 */ - cond = TCG_COND_NE; - break; - case 4: /* borrow (!carry) -> op1 < op2 */ - cond = TCG_COND_LTU; - break; - case 2 | 1: /* !borrow (carry) -> op1 >= op2 */ - cond = TCG_COND_GEU; + case 2 | 1: /* carry (!borrow) */ + cond = old_cc_op == CC_OP_ADDU ? TCG_COND_NE : TCG_COND_EQ; break; default: goto do_dynamic; @@ -911,7 +887,6 @@ static void disas_jcc(DisasContext *s, DisasCompare *c, uint32_t mask) break; case CC_OP_LTGT_32: case CC_OP_LTUGTU_32: - case CC_OP_SUBU_32: c->is_64 = false; c->u.s32.a = tcg_temp_new_i32(); tcg_gen_extrl_i64_i32(c->u.s32.a, cc_src); @@ -928,7 +903,6 @@ static void disas_jcc(DisasContext *s, DisasCompare *c, uint32_t mask) break; case CC_OP_LTGT_64: case CC_OP_LTUGTU_64: - case CC_OP_SUBU_64: c->u.s64.a = cc_src; c->u.s64.b = cc_dst; c->g1 = c->g2 = true; @@ -943,6 +917,7 @@ static void disas_jcc(DisasContext *s, DisasCompare *c, uint32_t mask) break; case CC_OP_ADDU: + case CC_OP_SUBU: c->is_64 = true; c->u.s64.b = tcg_const_i64(0); c->g1 = true; @@ -1446,6 +1421,9 @@ static void compute_carry(DisasContext *s) case CC_OP_ADDU: /* The carry value is already in cc_src (1,0). */ break; + case CC_OP_SUBU: + tcg_gen_addi_i64(cc_src, cc_src, 1); + break; default: gen_op_calc_cc(s); /* fall through */ @@ -4761,6 +4739,13 @@ static DisasJumpType op_sub(DisasContext *s, DisasOps *o) return DISAS_NEXT; } +static DisasJumpType op_subu64(DisasContext *s, DisasOps *o) +{ + tcg_gen_movi_i64(cc_src, 0); + tcg_gen_sub2_i64(o->out, cc_src, o->in1, cc_src, o->in2, cc_src); + return DISAS_NEXT; +} + static DisasJumpType op_subb(DisasContext *s, DisasOps *o) { DisasCompare cmp; @@ -5312,12 +5297,14 @@ static void cout_subs64(DisasContext *s, DisasOps *o) static void cout_subu32(DisasContext *s, DisasOps *o) { - gen_op_update3_cc_i64(s, CC_OP_SUBU_32, o->in1, o->in2, o->out); + tcg_gen_sari_i64(cc_src, o->out, 32); + tcg_gen_ext32u_i64(cc_dst, o->out); + gen_op_update2_cc_i64(s, CC_OP_SUBU, cc_src, cc_dst); } static void cout_subu64(DisasContext *s, DisasOps *o) { - gen_op_update3_cc_i64(s, CC_OP_SUBU_64, o->in1, o->in2, o->out); + gen_op_update2_cc_i64(s, CC_OP_SUBU, cc_src, o->out); } static void cout_subb32(DisasContext *s, DisasOps *o)