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[97.113.7.119]) by smtp.gmail.com with ESMTPSA id f6sm18999174pga.50.2019.09.04.12.31.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Sep 2019 12:31:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=d8Wdw3hGEJ+w80H7Z6N3YxcS5gbQ3Bt1g5kmZafUCnU=; b=XqaFgemVzu4+yDiome30Gqndsi6Hd7TEIU+HmdXOt9oYd10J3YEtc3gPX/3qKvBS2m JryOVOrvFEv3gpcv+I3QiMD2gh6pBPnS/Y6GaKxqEa5Mkp8MkNggOF6nh24wk5XCo+1m gCFelZkqGfT4V52m5Ud9+NX7QCu9jLFxe/StTcBVYvRldGVELXFvEIYj8CDV6wHg/oBa LCmaJ7wL8sqOqjLA+5stnPxlJn6t/aK+GsVL6tgStRuf9JpiodOaOVRCnktA6xEI/yju t8Pg5sqc3xyn6D8FBiKoZfK5c2HX5N6qaEoRaYMgsLu3cXDUtJEC5zXxJSeQYP10pRof uQBA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=d8Wdw3hGEJ+w80H7Z6N3YxcS5gbQ3Bt1g5kmZafUCnU=; b=Yj/XpbSTO0Jo4e1icUJmcLDlmHtZMhef/MRhITZxtcesPqDdFTXl1uQeN4tNoec9pC kR7rEkHryI6cHPFji5J+7XI6LZldbPZDJ0LlLYTauT67M4Nc4IeMX16peb+JF/JDDXxz eWPJ3meyiQ6zl4UyxROqw/ftzdOk6aTgbyvet0ZdOyjBce77hSfmFON7H1JGKAjJifsc BoHABvMUqL88C+hxZgLF5y1XKqzeWQ/LMAnfBFvhQ/L8j81D0OMfOL3C6nz38qbuaGnW yOsNH5szb0ROmZ8CVkFZjVMH7AllYBb4gXuONqMPkVOmoaO4ijHh2p+b4nIrHhHO83ql wuSQ== X-Gm-Message-State: APjAAAXCOKjXKypA7YV5gxW+lpRhKuAlDCGRV+c3mDBy3Zuvv56x1ON7 x6JzNaM4h+ZegXevqZ7hRdwe2rhckkI= X-Google-Smtp-Source: APXvYqzpIhulbr6Ms4FPfL8FL04IHY0jVKTL5JN+6CehQ1BAR6SzSLFf14GVTfVoE2DZ06GwZgDLnw== X-Received: by 2002:a17:902:36a:: with SMTP id 97mr4443725pld.75.1567625474851; Wed, 04 Sep 2019 12:31:14 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Date: Wed, 4 Sep 2019 12:30:01 -0700 Message-Id: <20190904193059.26202-12-richard.henderson@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190904193059.26202-1-richard.henderson@linaro.org> References: <20190904193059.26202-1-richard.henderson@linaro.org> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::643 Subject: [Qemu-devel] [PATCH v4 11/69] target/arm: Simplify op_smlawx for SMLAW* 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: peter.maydell@linaro.org, qemu-arm@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" By shifting the 16-bit input left by 16, we can align the desired portion of the 48-bit product and use tcg_gen_muls2_i32. Reviewed-by: Peter Maydell Signed-off-by: Richard Henderson --- target/arm/translate.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/target/arm/translate.c b/target/arm/translate.c index 37aa873e25..71cc96b70e 100644 --- a/target/arm/translate.c +++ b/target/arm/translate.c @@ -8242,7 +8242,6 @@ DO_SMLAX(SMLALTT, 2, 1, 1) static bool op_smlawx(DisasContext *s, arg_rrrr *a, bool add, bool mt) { TCGv_i32 t0, t1; - TCGv_i64 t64; =20 if (!ENABLE_ARCH_5TE) { return false; @@ -8250,16 +8249,17 @@ static bool op_smlawx(DisasContext *s, arg_rrrr *a,= bool add, bool mt) =20 t0 =3D load_reg(s, a->rn); t1 =3D load_reg(s, a->rm); + /* + * Since the nominal result is product<47:16>, shift the 16-bit + * input up by 16 bits, so that the result is at product<63:32>. + */ if (mt) { - tcg_gen_sari_i32(t1, t1, 16); + tcg_gen_andi_i32(t1, t1, 0xffff0000); } else { - gen_sxth(t1); + tcg_gen_shli_i32(t1, t1, 16); } - t64 =3D gen_muls_i64_i32(t0, t1); - tcg_gen_shri_i64(t64, t64, 16); - t1 =3D tcg_temp_new_i32(); - tcg_gen_extrl_i64_i32(t1, t64); - tcg_temp_free_i64(t64); + tcg_gen_muls2_i32(t0, t1, t0, t1); + tcg_temp_free_i32(t0); if (add) { t0 =3D load_reg(s, a->ra); gen_helper_add_setq(t1, cpu_env, t1, t0); --=20 2.17.1