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[174.21.150.71]) by smtp.gmail.com with ESMTPSA id l8sm5816497pjt.32.2020.12.25.12.20.12 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 25 Dec 2020 12:20:12 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=FnMPyDvv8qty8IO8qnH26ldICiCh5lihNUWEYMvpptg=; b=UbicDmUAJvMOGsWSkGL/+mVIvw5Ma7ysXht2PJH0KvhUiGENQR6YxRuo9xOA+19bBl rXhRRCwya9LCiM22txikfDlabxIsknrVn4US+rsLpsNsp3WSj0Zs4VfY/LdTazVKUasA 16dVOI+qjtYrdG9TM64yUI6BCfK0R1Tqf003A2lSh3rQrSUOOH4NoPoooWJvYkrgIeFO MPwWni+KDMkU2DLoiqbXynnOSn0MeDyXhzNbQ5tj3n6lJfkaAs8zqZGTaOghboToqkxG LgL8SZc+wJdcsywLCvXQDNTwg1ZKdlARCQWK6JI3C25UvrqnfmF5s6pqmJkWmjuA1bR0 R8jQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=FnMPyDvv8qty8IO8qnH26ldICiCh5lihNUWEYMvpptg=; b=h7+SZsFpwTowlrNHUSmm70WDch0hYCAxpVJfGr9bqAwsSCWKRSVL6wy2jN1Qi+rHEN Y2Rp/6pd5fJz/GD74Pg4REzANSoZe9nNDYUj7snpLSNVhpk66eEPwAqb1N4gZBVLZzUF JkcFaSidgVgPJWBY0ezouzR+/lTA2SxB/HVXFtSDPFYkokAHSWSYXZqa5bGLrzbZcFsD BkkykvxwRgQdZAiREvmqASuJ2HNzs354H/HQYx0Yia2IKzDkRB37H6PagFHA097qUnh3 WYVICOwy4vgUEU87vTMwH0pzGRHuSBXjCip7ooIwIp1B99VYTG0I8djud+Ggf+qsuUsf t5Fw== X-Gm-Message-State: AOAM531B4INbn2divtHdnF9TLfoZ2V1G2xYbpXq2cDw6ZMSIjP3tRWmw S5pBwSkVeP8KvI9qnsvC5+LS2sLDkWAs1Q== X-Google-Smtp-Source: ABdhPJyGP8iE2YL5NiJXt2VTlddYszrapT5DMrWpykWNMzYNzeBaqdB3/BSCU1VOEfItWlrZhGJRAg== X-Received: by 2002:aa7:9f0f:0:b029:19b:c68f:61cd with SMTP id g15-20020aa79f0f0000b029019bc68f61cdmr31432212pfr.45.1608927612954; Fri, 25 Dec 2020 12:20:12 -0800 (PST) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH 13/16] tcg: Expand usadd/ussub with umin/umax Date: Fri, 25 Dec 2020 12:19:53 -0800 Message-Id: <20201225201956.692861-14-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201225201956.692861-1-richard.henderson@linaro.org> References: <20201225201956.692861-1-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::52a; envelope-from=richard.henderson@linaro.org; helo=mail-pg1-x52a.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: 2.1.23 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" X-ZohoMail-DKIM: pass (identity @linaro.org) Content-Type: text/plain; charset="utf-8" For usadd, we only have to consider overflow. Since ~B + B =3D=3D -1, the maximum value for A that saturates is ~B. For ussub, we only have to consider underflow. The minimum value that saturates to 0 from A - B is B. Signed-off-by: Richard Henderson --- tcg/tcg-op-vec.c | 37 +++++++++++++++++++++++++++++++++++-- 1 file changed, 35 insertions(+), 2 deletions(-) diff --git a/tcg/tcg-op-vec.c b/tcg/tcg-op-vec.c index d19aa7373e..9747b7bb06 100644 --- a/tcg/tcg-op-vec.c +++ b/tcg/tcg-op-vec.c @@ -120,6 +120,18 @@ bool tcg_can_emit_vecop_list(const TCGOpcode *list, continue; } break; + case INDEX_op_usadd_vec: + if (tcg_can_emit_vec_op(INDEX_op_umin_vec, type, vece) || + tcg_can_emit_vec_op(INDEX_op_cmp_vec, type, vece)) { + continue; + } + break; + case INDEX_op_ussub_vec: + if (tcg_can_emit_vec_op(INDEX_op_umax_vec, type, vece) || + tcg_can_emit_vec_op(INDEX_op_cmp_vec, type, vece)) { + continue; + } + break; case INDEX_op_cmpsel_vec: case INDEX_op_smin_vec: case INDEX_op_smax_vec: @@ -604,7 +616,18 @@ void tcg_gen_ssadd_vec(unsigned vece, TCGv_vec r, TCGv= _vec a, TCGv_vec b) =20 void tcg_gen_usadd_vec(unsigned vece, TCGv_vec r, TCGv_vec a, TCGv_vec b) { - do_op3_nofail(vece, r, a, b, INDEX_op_usadd_vec); + if (!do_op3(vece, r, a, b, INDEX_op_usadd_vec)) { + const TCGOpcode *hold_list =3D tcg_swap_vecop_list(NULL); + TCGv_vec t =3D tcg_temp_new_vec_matching(r); + + /* usadd(a, b) =3D min(a, ~b) + b */ + tcg_gen_not_vec(vece, t, b); + tcg_gen_umin_vec(vece, t, t, a); + tcg_gen_add_vec(vece, r, r, b); + + tcg_temp_free_vec(t); + tcg_swap_vecop_list(hold_list); + } } =20 void tcg_gen_sssub_vec(unsigned vece, TCGv_vec r, TCGv_vec a, TCGv_vec b) @@ -614,7 +637,17 @@ void tcg_gen_sssub_vec(unsigned vece, TCGv_vec r, TCGv= _vec a, TCGv_vec b) =20 void tcg_gen_ussub_vec(unsigned vece, TCGv_vec r, TCGv_vec a, TCGv_vec b) { - do_op3_nofail(vece, r, a, b, INDEX_op_ussub_vec); + if (!do_op3(vece, r, a, b, INDEX_op_ussub_vec)) { + const TCGOpcode *hold_list =3D tcg_swap_vecop_list(NULL); + TCGv_vec t =3D tcg_temp_new_vec_matching(r); + + /* ussub(a, b) =3D max(a, b) - b */ + tcg_gen_umax_vec(vece, t, a, b); + tcg_gen_sub_vec(vece, r, t, b); + + tcg_temp_free_vec(t); + tcg_swap_vecop_list(hold_list); + } } =20 static void do_minmax(unsigned vece, TCGv_vec r, TCGv_vec a, --=20 2.25.1