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X-CSE-ConnectionGUID: KG0C92ZFS1uFROWpcT8T4w== X-CSE-MsgGUID: fsXmwUFUQ+eZoi1a/9+XdQ== X-IronPort-AV: E=McAfee;i="6700,10204,11184"; a="23952014" X-IronPort-AV: E=Sophos;i="6.10,201,1719903600"; d="scan'208";a="23952014" Received: from orviesa003.jf.intel.com ([10.64.159.143]) by fmvoesa111.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Sep 2024 00:25:02 -0700 X-CSE-ConnectionGUID: GauL4VU2SY2IhcUc2zw2DQ== X-CSE-MsgGUID: M/5eKntSTPqRrHkV6STuTw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.10,201,1719903600"; d="scan'208";a="69969433" Received: from panli.sh.intel.com ([10.239.154.73]) by orviesa003.jf.intel.com with ESMTP; 04 Sep 2024 00:25:00 -0700 From: pan2.li@intel.com To: gcc-patches@gcc.gnu.org Cc: richard.guenther@gmail.com, Tamar.Christina@arm.com, juzhe.zhong@rivai.ai, kito.cheng@gmail.com, jeffreyalaw@gmail.com, rdapp.gcc@gmail.com, Pan Li Subject: [PATCH v1 2/2] Match: Support form 3 for scalar signed integer .SAT_ADD Date: Wed, 4 Sep 2024 15:24:13 +0800 Message-ID: <20240904072413.1282149-2-pan2.li@intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240904072413.1282149-1-pan2.li@intel.com> References: <20240904072413.1282149-1-pan2.li@intel.com> MIME-Version: 1.0 X-Spam-Status: No, score=-11.6 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, SPF_HELO_NONE, SPF_NONE, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org From: Pan Li This patch would like to support the form 3 of the scalar signed integer .SAT_ADD. Aka below example: Form 3: #define DEF_SAT_S_ADD_FMT_3(T, UT, MIN, MAX) \ T __attribute__((noinline)) \ sat_s_add_##T##_fmt_3 (T x, T y) \ { \ T sum; \ bool overflow = __builtin_add_overflow (x, y, &sum); \ return overflow ? x < 0 ? MIN : MAX : sum; \ } DEF_SAT_S_ADD_FMT_3(int8_t, uint8_t, INT8_MIN, INT8_MAX) We can tell the difference before and after this patch if backend implemented the ssadd3 pattern similar as below. Before this patch: 4 │ __attribute__((noinline)) 5 │ int8_t sat_s_add_int8_t_fmt_3 (int8_t x, int8_t y) 6 │ { 7 │ signed char _1; 8 │ signed char _2; 9 │ int8_t _3; 10 │ __complex__ signed char _6; 11 │ _Bool _8; 12 │ signed char _9; 13 │ signed char _10; 14 │ signed char _11; 15 │ 16 │ ;; basic block 2, loop depth 0 17 │ ;; pred: ENTRY 18 │ _6 = .ADD_OVERFLOW (x_4(D), y_5(D)); 19 │ _2 = IMAGPART_EXPR <_6>; 20 │ if (_2 != 0) 21 │ goto ; [50.00%] 22 │ else 23 │ goto ; [50.00%] 24 │ ;; succ: 4 25 │ ;; 3 26 │ 27 │ ;; basic block 3, loop depth 0 28 │ ;; pred: 2 29 │ _1 = REALPART_EXPR <_6>; 30 │ goto ; [100.00%] 31 │ ;; succ: 5 32 │ 33 │ ;; basic block 4, loop depth 0 34 │ ;; pred: 2 35 │ _8 = x_4(D) < 0; 36 │ _9 = (signed char) _8; 37 │ _10 = -_9; 38 │ _11 = _10 ^ 127; 39 │ ;; succ: 5 40 │ 41 │ ;; basic block 5, loop depth 0 42 │ ;; pred: 3 43 │ ;; 4 44 │ # _3 = PHI <_1(3), _11(4)> 45 │ return _3; 46 │ ;; succ: EXIT 47 │ 48 │ } After this patch: 4 │ __attribute__((noinline)) 5 │ int8_t sat_s_add_int8_t_fmt_3 (int8_t x, int8_t y) 6 │ { 7 │ int8_t _3; 8 │ 9 │ ;; basic block 2, loop depth 0 10 │ ;; pred: ENTRY 11 │ _3 = .SAT_ADD (x_4(D), y_5(D)); [tail call] 12 │ return _3; 13 │ ;; succ: EXIT 14 │ 15 │ } The below test suites are passed for this patch. * The rv64gcv fully regression test. * The x86 bootstrap test. * The x86 fully regression test. gcc/ChangeLog: * match.pd: Add the form 3 of signed .SAT_ADD matching. Signed-off-by: Pan Li --- gcc/match.pd | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/gcc/match.pd b/gcc/match.pd index 1372f2ba377..1218abcd01a 100644 --- a/gcc/match.pd +++ b/gcc/match.pd @@ -3222,6 +3222,16 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT) (if (INTEGRAL_TYPE_P (type) && !TYPE_UNSIGNED (type) && types_match (type, @0, @1)))) +/* Signed saturation add, case 3: + Z = .ADD_OVERFLOW (X, Y) + SAT_S_ADD = IMAGPART_EXPR (Z) != 0 ? (-(T)(X < 0) ^ MAX) : sum; */ +(match (signed_integer_sat_add @0 @1) + (cond^ (ne (imagpart (IFN_ADD_OVERFLOW:c@2 @0 @1)) integer_zerop) + (bit_xor:c (negate (convert (lt @0 integer_zerop))) max_value) + (realpart @2)) + (if (INTEGRAL_TYPE_P (type) && !TYPE_UNSIGNED (type) + && types_match (type, @0, @1)))) + /* Unsigned saturation sub, case 1 (branch with gt): SAT_U_SUB = X > Y ? X - Y : 0 */ (match (unsigned_integer_sat_sub @0 @1)