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Signed-off-by: Richard Henderson [PMD: Split of following commit] Signed-off-by: Philippe Mathieu-Daud=C3=A9 --- tcg/optimize.c | 68 +++++++++++++++++++++++++------------------------- 1 file changed, 34 insertions(+), 34 deletions(-) diff --git a/tcg/optimize.c b/tcg/optimize.c index b1abec69a5d..ef5eb2cf175 100644 --- a/tcg/optimize.c +++ b/tcg/optimize.c @@ -2173,45 +2173,45 @@ static bool fold_multiply2(OptContext *ctx, TCGOp *= op) { swap_commutative(op->args[0], &op->args[2], &op->args[3]); =20 - if (arg_is_const(op->args[2]) && arg_is_const(op->args[3])) { - uint64_t a =3D arg_const_val(op->args[2]); + if (arg_is_const(op->args[3])) { uint64_t b =3D arg_const_val(op->args[3]); - uint64_t h, l; - TCGArg rl, rh; + TCGArg rl =3D op->args[0]; + TCGArg rh =3D op->args[1]; TCGOp *op2; =20 - switch (op->opc) { - case INDEX_op_mulu2: - if (ctx->type =3D=3D TCG_TYPE_I32) { - l =3D (uint64_t)(uint32_t)a * (uint32_t)b; - h =3D (int32_t)(l >> 32); - l =3D (int32_t)l; - } else { - mulu64(&l, &h, a, b); + if (arg_is_const(op->args[2])) { + uint64_t a =3D arg_const_val(op->args[2]); + uint64_t h, l; + + switch (op->opc) { + case INDEX_op_mulu2: + if (ctx->type =3D=3D TCG_TYPE_I32) { + l =3D (uint64_t)(uint32_t)a * (uint32_t)b; + h =3D (int32_t)(l >> 32); + l =3D (int32_t)l; + } else { + mulu64(&l, &h, a, b); + } + break; + case INDEX_op_muls2: + if (ctx->type =3D=3D TCG_TYPE_I32) { + l =3D (int64_t)(int32_t)a * (int32_t)b; + h =3D l >> 32; + l =3D (int32_t)l; + } else { + muls64(&l, &h, a, b); + } + break; + default: + g_assert_not_reached(); } - break; - case INDEX_op_muls2: - if (ctx->type =3D=3D TCG_TYPE_I32) { - l =3D (int64_t)(int32_t)a * (int32_t)b; - h =3D l >> 32; - l =3D (int32_t)l; - } else { - muls64(&l, &h, a, b); - } - break; - default: - g_assert_not_reached(); + + /* The proper opcode is supplied by tcg_opt_gen_mov. */ + op2 =3D opt_insert_before(ctx, op, 0, 2); + tcg_opt_gen_movi(ctx, op, rl, l); + tcg_opt_gen_movi(ctx, op2, rh, h); + return true; } - - rl =3D op->args[0]; - rh =3D op->args[1]; - - /* The proper opcode is supplied by tcg_opt_gen_mov. */ - op2 =3D opt_insert_before(ctx, op, 0, 2); - - tcg_opt_gen_movi(ctx, op, rl, l); - tcg_opt_gen_movi(ctx, op2, rh, h); - return true; } return finish_folding(ctx, op); } --=20 2.53.0 From nobody Sat May 30 18:35:09 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=linaro.org ARC-Seal: i=1; a=rsa-sha256; t=1779281810; cv=none; d=zohomail.com; s=zohoarc; b=IX4jS+aHj8NnmWegS/WBgys9RHrR2ZGdYab75M+5bnQz6SPIuGwzO4YnDF7VoSlbVctir7aBf4Co5cIeP3Czyz2bTZ8O+Tw9Z563Ah3a/d1LJlFCtKVgII0AhuahgPbiZdlHbJRzps6d170QQmKfrViY79l7fmJQjndgckFKYrQ= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1779281810; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=KD0LwbPnEERREvv0kdN5YQBpyhPsKT2FNknCk4iL4as=; b=XkhEJQu2huzp7MKOzZ/pkAE8w/IQDMoW5ohyHwkbOqlMYTi/+Ox8MAVjaI5RN/ZawQpvdSG0H1qFC5MhawhyQH4crMn6EKFQTjZhqIjxMm4AetU8/OLQB77iUQT2Dg0GM6S6dWA8zBZ/jTp+IOLZ1moV9Bux0OL1VMfgebphxmA= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1779281810148188.36897763452646; Wed, 20 May 2026 05:56:50 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists1p.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1wPgP3-0007Ez-Eu; Wed, 20 May 2026 08:52:01 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1wPgP1-00074Q-7p for qemu-devel@nongnu.org; Wed, 20 May 2026 08:51:59 -0400 Received: from mail-wm1-x32c.google.com ([2a00:1450:4864:20::32c]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1wPgOz-0003d6-GM for qemu-devel@nongnu.org; Wed, 20 May 2026 08:51:58 -0400 Received: by mail-wm1-x32c.google.com with SMTP id 5b1f17b1804b1-488ab2db91aso51414625e9.3 for ; Wed, 20 May 2026 05:51:57 -0700 (PDT) Received: from localhost.localdomain (88-187-86-199.subs.proxad.net. [88.187.86.199]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48feaf0fb46sm129829755e9.11.2026.05.20.05.51.54 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Wed, 20 May 2026 05:51:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1779281516; x=1779886316; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=KD0LwbPnEERREvv0kdN5YQBpyhPsKT2FNknCk4iL4as=; b=ncKbYTihufUxTkmWnkYFOi3xFVCcYzD7+mTL++1jpC51SYLLPsmQfQVWmEx3v7d7RN U1375c2a459JVE0mMiLmuFybc4Euc2yY8kCaDdLLrTbTB+NyYotLOoqXMkxNFc4QEQvf KLDsPzvCHubG9espCTnEqp2zkwvgSLu/Y+LTL6hhcg/7Na0E84lAIePBREzzQ649O20i mfLWwkIY9DOUPV+B1Zct/J33CULjjyjWWBuJZ1FcHqAjynaX3ICjSxcm4GGjQrc10qE7 raXgX3F59csnetJ1xXUck6pvqDwPNapfkvCRoL2wEsxM+B+DVuVr9Kpt2DVfq7GRvxFq mX5g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1779281516; x=1779886316; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=KD0LwbPnEERREvv0kdN5YQBpyhPsKT2FNknCk4iL4as=; b=laEOiUR51HLFU+qP3apJZ/oG55BEffiuoS28dSOMZfxz/uzJaZb9IkFBN9TQHapRbh JQWWsxV+fu5udIaDYCFK0yANu1EoFkgkQB7eAytLIQzi6lY0hWhhZXQPfL2R4ToWIhXm 8T6KiXo9ssbJ8KS/gskJ7Bt2mSN+T/VDlsguq1ySZ0MXPcsW12wzzm3sxW8thoyvNTPU k2pkruCtKYInNe33LhB1suQ6S2m0GeNDucAULWbGgBldpvyxGNKbc0PaECTUE6haJ/Jh OWrURMCyjH/JzkeDfxgw8qnyIFskRb/u56vSQisRl6UpUMqwwa7m5/la5vfe704pc7Og gROQ== X-Gm-Message-State: AOJu0Yw9HfTQTYDAkZ235r6m+V6pKQt6PDuu8kqxeAydt3RMXnL3Bqj9 t7SZp3roJZCozZ+aZXliWN1mBllFRKpO+FsQ8qipl7npNlOoxGHskluP2HmMpnPhivwKYAZR1YV tAO3BD9w= X-Gm-Gg: Acq92OHlaCXg4C0RJeslN1w/lzbF5CdvoqSVZidWbTNHnQjZJ1CwgMFAKXXtu+EUp+Q pTn8iI+7Vu2PgSEAKGrKgCQRzZcumjEwM5n+4KUzxe/pToRZvsvK8ekGFmQ2igT/Ii1w9afulFE rj9weKYv5+GPmgCE8yUbeDP/ZpXKHuFg77ZL3Mw/F457XsAjRPFZDL8nj1ItPWMa7xu0bN8T970 2RUyilakrXRhhKQNJnDiLkVPO00LIo+XVMKnGl0m53oxvjzyHi1qPUT38P2eY8qXJS7dMSoIw2z ycxO0XiRzkJnt6f+//Ag43Zj+cKfaC78SrpbJAAKWz6xAHTH2yDhsi4wTrB1do/l/+8wDvR6eG0 w5upEl43tWFs37iyvYXqkXbOWaHm1VhHZ6nFhNPuNVhC6gL8qZOptxAdnNGyK1MDIdnetZbr013 /1JBoWH+3onPJ8hUkB6Jr/rT69YlCaa8z9CyT6KwxWL5vjDSU2Jfg2flez08eWLRjRk0ZwJsAg6 JZOAsP6kV4= X-Received: by 2002:a05:600c:181c:b0:48f:d5b2:7c1a with SMTP id 5b1f17b1804b1-48fe60eca66mr238393215e9.13.1779281515851; Wed, 20 May 2026 05:51:55 -0700 (PDT) From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= To: qemu-devel@nongnu.org Cc: Richard Henderson , James Hilliard , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Subject: [PATCH v11 2/2] tcg: Optimize INDEX_op_mul[us]2 for 0 and 1 Date: Wed, 20 May 2026 14:51:39 +0200 Message-ID: <20260520125139.13352-3-philmd@linaro.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260520125139.13352-1-philmd@linaro.org> References: <20260520125139.13352-1-philmd@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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=lists1p.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::32c; envelope-from=philmd@linaro.org; helo=mail-wm1-x32c.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: qemu development 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: 1779281811338154100 From: Richard Henderson Zero operands produce a zero high and low product. One operands produce a copy of the other operand and a zero or sign extension in the high half. Fold those cases during TCG optimization so wide-multiply idioms used by target translators can collapse before code generation. Signed-off-by: Richard Henderson Signed-off-by: James Hilliard Signed-off-by: Philippe Mathieu-Daud=C3=A9 --- tcg/optimize.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/tcg/optimize.c b/tcg/optimize.c index ef5eb2cf175..fcdef25beed 100644 --- a/tcg/optimize.c +++ b/tcg/optimize.c @@ -2212,6 +2212,34 @@ static bool fold_multiply2(OptContext *ctx, TCGOp *o= p) tcg_opt_gen_movi(ctx, op2, rh, h); return true; } + + if (b =3D=3D 0) { + op2 =3D opt_insert_before(ctx, op, 0, 2); + tcg_opt_gen_movi(ctx, op2, rl, 0); + tcg_opt_gen_movi(ctx, op, rh, 0); + return true; + } + if (b =3D=3D 1) { + op2 =3D opt_insert_before(ctx, op, 0, 2); + tcg_opt_gen_mov(ctx, op2, rl, op->args[2]); + + switch (op->opc) { + case INDEX_op_mulu2: + tcg_opt_gen_movi(ctx, op, rh, 0); + break; + case INDEX_op_muls2: + op->opc =3D INDEX_op_sar; + op->args[0] =3D rh; + op->args[1] =3D rl; + op->args[2] =3D + arg_new_constant(ctx, tcg_type_size(ctx->type) * 8 - 1= ); + break; + default: + g_assert_not_reached(); + } + + return true; + } } return finish_folding(ctx, op); } --=20 2.53.0