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Sat, 21 Jun 2025 16:57:33 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH v2 085/101] target/arm: Implement CNTP (predicate as counter) for SME2/SVE2p1 Date: Sat, 21 Jun 2025 16:50:21 -0700 Message-ID: <20250621235037.74091-86-richard.henderson@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250621235037.74091-1-richard.henderson@linaro.org> References: <20250621235037.74091-1-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::430; envelope-from=richard.henderson@linaro.org; helo=mail-pf1-x430.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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1750550527303116600 Content-Type: text/plain; charset="utf-8" Signed-off-by: Richard Henderson --- target/arm/tcg/helper-sve.h | 1 + target/arm/tcg/sve_helper.c | 59 ++++++++++++++++++++++++++++++++++ target/arm/tcg/translate-sve.c | 30 +++++++++++++++++ target/arm/tcg/sve.decode | 3 +- 4 files changed, 92 insertions(+), 1 deletion(-) diff --git a/target/arm/tcg/helper-sve.h b/target/arm/tcg/helper-sve.h index 906da384dc..733828a880 100644 --- a/target/arm/tcg/helper-sve.h +++ b/target/arm/tcg/helper-sve.h @@ -937,6 +937,7 @@ DEF_HELPER_FLAGS_4(sve_brkn, TCG_CALL_NO_RWG, void, ptr= , ptr, ptr, i32) DEF_HELPER_FLAGS_4(sve_brkns, TCG_CALL_NO_RWG, i32, ptr, ptr, ptr, i32) =20 DEF_HELPER_FLAGS_3(sve_cntp, TCG_CALL_NO_RWG, i64, ptr, ptr, i32) +DEF_HELPER_FLAGS_2(sve2p1_cntp_c, TCG_CALL_NO_RWG_SE, i64, i32, i32) =20 DEF_HELPER_FLAGS_3(sve_whilel, TCG_CALL_NO_RWG, i32, ptr, i32, i32) DEF_HELPER_FLAGS_3(sve_whileg, TCG_CALL_NO_RWG, i32, ptr, i32, i32) diff --git a/target/arm/tcg/sve_helper.c b/target/arm/tcg/sve_helper.c index ac38d62f04..7d6f5fbb58 100644 --- a/target/arm/tcg/sve_helper.c +++ b/target/arm/tcg/sve_helper.c @@ -4184,6 +4184,65 @@ uint64_t HELPER(sve_cntp)(void *vn, void *vg, uint32= _t pred_desc) return sum; } =20 +uint64_t HELPER(sve2p1_cntp_c)(uint32_t png, uint32_t desc) +{ + int pl =3D FIELD_EX32(desc, PREDDESC, OPRSZ); + int vl =3D pl * 8; + unsigned v_esz =3D FIELD_EX32(desc, PREDDESC, ESZ); + int lg2_width =3D FIELD_EX32(desc, PREDDESC, DATA) + 1; + unsigned p_esz; + int p_count, maxelem; + bool p_invert; + + /* C.f. Arm pseudocode CounterToPredicate. */ + if ((png & 0xf) =3D=3D 0) { + /* Canonical false predicate. */ + return 0; + } + p_esz =3D ctz32(png); + + /* + * maxbit =3D log2(pl * 4) + * =3D log2(vl / 8 * 4) + * =3D log2(vl / 2) + * =3D log2(vl) - 1 + * maxbit_mask =3D ones + * =3D (1 << (maxbit + 1)) - 1 + * =3D (1 << (log2(vl) - 1 + 1)) - 1 + * =3D (1 << log2(vl)) - 1 + * =3D pow2ceil(vl) - 1 + * Note that we keep count in bytes, not elements. + */ + p_count =3D (png & (pow2ceil(vl) - 1)) >> 1; + p_invert =3D (png >> 15) & 1; + + /* + * If the esz encoded into the predicate is not larger than the + * vector operation esz, then the expanded predicate bit will + * be true for all vector elements. If the predicate esz is + * larger than the vector esz, then only even multiples can be + * true, and the rest will be false. + */ + v_esz =3D MAX(v_esz, p_esz); + maxelem =3D (vl << lg2_width) >> v_esz; + + if (p_count =3D=3D 0) { + if (p_invert) { + /* Canonical true predicate: invert count zero. */ + return maxelem; + } + /* Non-canonical false predicate. */ + return 0; + } + if (p_invert) { + p_count =3D DIV_ROUND_UP(p_count, 1 << v_esz); + p_count =3D maxelem - p_count; + return MAX(0, p_count); + } + p_count >>=3D v_esz; + return MIN(p_count, maxelem); +} + /* C.f. Arm pseudocode EncodePredCount */ static uint64_t encode_pred_count(uint32_t elements, uint32_t count, uint32_t esz, bool invert) diff --git a/target/arm/tcg/translate-sve.c b/target/arm/tcg/translate-sve.c index f3ac0f6300..62ace5d300 100644 --- a/target/arm/tcg/translate-sve.c +++ b/target/arm/tcg/translate-sve.c @@ -3035,6 +3035,36 @@ static bool trans_CNTP(DisasContext *s, arg_CNTP *a) return true; } =20 +static bool trans_CNTP_c(DisasContext *s, arg_CNTP_c *a) +{ + TCGv_i32 t_png; + uint32_t desc =3D 0; + + if (dc_isar_feature(aa64_sve2p1, s)) { + if (!sve_access_check(s)) { + return true; + } + } else if (dc_isar_feature(aa64_sme2, s)) { + if (!sme_sm_enabled_check(s)) { + return true; + } + } else { + return false; + } + + t_png =3D tcg_temp_new_i32(); + tcg_gen_ld16u_i32(t_png, tcg_env, + pred_full_reg_offset(s, a->rn) ^ + (HOST_BIG_ENDIAN ? 6 : 0)); + + desc =3D FIELD_DP32(desc, PREDDESC, OPRSZ, pred_full_reg_size(s)); + desc =3D FIELD_DP32(desc, PREDDESC, ESZ, a->esz); + desc =3D FIELD_DP32(desc, PREDDESC, DATA, a->vl); + + gen_helper_sve2p1_cntp_c(cpu_reg(s, a->rd), t_png, tcg_constant_i32(de= sc)); + return true; +} + static bool trans_INCDECP_r(DisasContext *s, arg_incdec_pred *a) { if (!dc_isar_feature(aa64_sve, s)) { diff --git a/target/arm/tcg/sve.decode b/target/arm/tcg/sve.decode index 0eb4fd9667..f3db790460 100644 --- a/target/arm/tcg/sve.decode +++ b/target/arm/tcg/sve.decode @@ -784,7 +784,8 @@ BRKN 00100101 0. 01100001 .... 0 .... 0 ....= @pd_pg_pn_s ### SVE Predicate Count Group =20 # SVE predicate count -CNTP 00100101 .. 100 000 10 .... 0 .... ..... @rd_pg4_pn +CNTP 00100101 .. 100 000 10 .... 0 .... ..... @rd_pg4_pn +CNTP_c 00100101 esz:2 100 000 10 000 vl:1 1 rn:4 rd:5 =20 # SVE inc/dec register by predicate count INCDECP_r 00100101 .. 10110 d:1 10001 00 .... ..... @incdec_pred= u=3D1 --=20 2.43.0