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[174.21.6.47]) by smtp.gmail.com with ESMTPSA id 10sm2327640pfo.69.2018.02.11.12.39.35 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sun, 11 Feb 2018 12:39:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:subject:date:message-id; bh=ycZUtBp55BeNhkkhqyH7cl+WKldgPD+nTd1Yis4qdpg=; b=azRV4byyjMxqR0fV+WHkEIuAq3w9FrGvBHokU3sb4nvAcRwdYBDYk6f8HxRVB86rld I82k00bRiPqk6y2bFHYlf58KiSL2qM9jajN8J5rAPreKzH3JGuFMx9ich4nh7L9XFOzg A/8V/pvElNUZvA08z1B10uFeR8aV5OPbCfi5M= 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; bh=ycZUtBp55BeNhkkhqyH7cl+WKldgPD+nTd1Yis4qdpg=; b=d1DGV8Z+hFH63tr7G2nUQQ/mIZiYGz+xNJelOxODjoF6ZTWW1pak1zyD9V80DXc5Xx I1lBtbsNWnn/PE9V7g/oYIweo2m8drxdVIqtMJk5MudTbjpJSz3kqT2Lh03asY6OfLnp DnspHSitInVCxJ6krgqu1uM02VRSg34YsqDW4LRE2tVuHkVyQiX5rqWZM7hJD/db9roK SJ/N4ipYxiLq2P5txlRMGUEB6JOuWhLg4u/mCzVu/j76TMtYLCZA+OKcLPwEJqE8xpZr UcDwKr8AnrDfidszEU+5ikzEgAgWdDSrqYVFDEw5sa45ATY9KLlu/MRk3EwXYnvNQ9H2 KiFA== X-Gm-Message-State: APf1xPDq5pR/vLUfdctrNhrG8M6/glPc0aa3Vz+cqM2aKtB5b6NNecyZ TynG4G4nFE+OCsswgLXSX+UDOCUs72M= X-Google-Smtp-Source: AH8x2242bOZGDPAQOMkwYmuKm9Qryjv0JRE9/3LzrZ0UqD/hp1bmiec9kKWr/yWFFDuCXRj0baP7KA== X-Received: by 2002:a17:902:595d:: with SMTP id e29-v6mr4370934plj.189.1518381577043; Sun, 11 Feb 2018 12:39:37 -0800 (PST) From: Richard Henderson To: qemu-devel@nongnu.org Date: Sun, 11 Feb 2018 12:39:34 -0800 Message-Id: <20180211203934.15546-1-richard.henderson@linaro.org> X-Mailer: git-send-email 2.14.3 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:400e:c01::242 Subject: [Qemu-devel] [PATCH] tcg: Improve tcg_gen_muli_i32/i64 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 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: fail (Header signature does not verify) X-ZohoMail: RDKM_2 RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Convert multiplication by power of two to left shift. Signed-off-by: Richard Henderson Reviewed-by: Emilio G. Cota Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- tcg/tcg-op.c | 24 ++++++++++++++++++------ 1 file changed, 18 insertions(+), 6 deletions(-) diff --git a/tcg/tcg-op.c b/tcg/tcg-op.c index 3467787323..34b96d68f3 100644 --- a/tcg/tcg-op.c +++ b/tcg/tcg-op.c @@ -277,9 +277,15 @@ void tcg_gen_setcondi_i32(TCGCond cond, TCGv_i32 ret, =20 void tcg_gen_muli_i32(TCGv_i32 ret, TCGv_i32 arg1, int32_t arg2) { - TCGv_i32 t0 =3D tcg_const_i32(arg2); - tcg_gen_mul_i32(ret, arg1, t0); - tcg_temp_free_i32(t0); + if (arg2 =3D=3D 0) { + tcg_gen_movi_i32(ret, 0); + } else if (is_power_of_2(arg2)) { + tcg_gen_shli_i32(ret, arg1, ctz32(arg2)); + } else { + TCGv_i32 t0 =3D tcg_const_i32(arg2); + tcg_gen_mul_i32(ret, arg1, t0); + tcg_temp_free_i32(t0); + } } =20 void tcg_gen_div_i32(TCGv_i32 ret, TCGv_i32 arg1, TCGv_i32 arg2) @@ -1430,9 +1436,15 @@ void tcg_gen_setcondi_i64(TCGCond cond, TCGv_i64 ret, =20 void tcg_gen_muli_i64(TCGv_i64 ret, TCGv_i64 arg1, int64_t arg2) { - TCGv_i64 t0 =3D tcg_const_i64(arg2); - tcg_gen_mul_i64(ret, arg1, t0); - tcg_temp_free_i64(t0); + if (arg2 =3D=3D 0) { + tcg_gen_movi_i64(ret, 0); + } else if (is_power_of_2(arg2)) { + tcg_gen_shli_i64(ret, arg1, ctz64(arg2)); + } else { + TCGv_i64 t0 =3D tcg_const_i64(arg2); + tcg_gen_mul_i64(ret, arg1, t0); + tcg_temp_free_i64(t0); + } } =20 void tcg_gen_div_i64(TCGv_i64 ret, TCGv_i64 arg1, TCGv_i64 arg2) --=20 2.14.3