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[97.113.165.104]) by smtp.gmail.com with ESMTPSA id a17sm3532594pfk.173.2017.10.20.16.20.40 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 20 Oct 2017 16:20:40 -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 :mime-version:content-transfer-encoding; bh=6Cea3ZwIgqGR0ikYypu8xyy8LUMvO1iRCow79pbvw6Q=; b=c/N6lgm2EYcfKXCDCY+ePejf9oCBRpP8Rqufw7nIy0hrLyZ/skqEk61lpJhrJ4mFAA XryDpkiTLukU9oPiU4LqPk5YWf5HEBzaOdgh2pduzUY4xQZs2jRu9sf03Qddya07vGXS gV8T84WoHa8E1tz2OT5W6+iN35SR0nP+HOtb4= 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:mime-version:content-transfer-encoding; bh=6Cea3ZwIgqGR0ikYypu8xyy8LUMvO1iRCow79pbvw6Q=; b=RV75gVmtcrchMYlzbga+aj8KayeOrzOqWcmKsDhi6FPskGAJnOdtvCXUf3ttVfCkzZ ofrdTWYvEA+j1LYM+qNTkTgQJxIoMBs439UqpgJcbE5olmK11Xjkqok0Q1HJmM50fzf0 hbmy7Qt+JuxGX3D1p7j4prsQc9rLSpccwc8QUHkjAUldJ0pGJvxIlw60uvr0hkB9FMtf Cr8ozafEQQkiUoMg/AUbc6q7ITYIH6upxqeb9hkzXe+qORYC3K8EFt0bZGX9HDB+QNll xpGK0B6WpnKmP8ZiHHFZBl9NZUlxMHcBS7gOqhsTJkB0RRrlAw67NUywedX6qyXcZiaG 7McA== X-Gm-Message-State: AMCzsaVTb4ENoQ5LV7naCrZOgKz5jOGSlTHIzNQnCDJ/awlVwqhkz8Pw 1g3aJlsZRdJabac1/sNE0u/HUQitsvU= X-Google-Smtp-Source: ABhQp+Rdwb3GVroXkEKajvjyytRxn7QPD1wyNVTX0bcF8kxb9C0NOCpcHiHtC3+2VuJYTUo1hhcchw== X-Received: by 10.84.162.204 with SMTP id o12mr5212172plg.230.1508541641549; Fri, 20 Oct 2017 16:20:41 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Date: Fri, 20 Oct 2017 16:19:41 -0700 Message-Id: <20171020232023.15010-11-richard.henderson@linaro.org> X-Mailer: git-send-email 2.13.6 In-Reply-To: <20171020232023.15010-1-richard.henderson@linaro.org> References: <20171020232023.15010-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:400e:c00::242 Subject: [Qemu-devel] [PATCH v7 10/52] tcg: Avoid loops against variable bounds 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: , Cc: pbonzini@redhat.com, cota@braap.org, f4bug@amsat.org, Richard Henderson 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 From: Richard Henderson Copy s->nb_globals or s->nb_temps to a local variable for the purposes of iteration. This should allow the compiler to use low-overhead looping constructs on some hosts. Reviewed-by: Emilio G. Cota Reviewed-by: Alex Benn=C3=A9e Signed-off-by: Richard Henderson Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- tcg/tcg.c | 27 ++++++++++----------------- 1 file changed, 10 insertions(+), 17 deletions(-) diff --git a/tcg/tcg.c b/tcg/tcg.c index d08e34a9d8..840e65c0d4 100644 --- a/tcg/tcg.c +++ b/tcg/tcg.c @@ -1159,23 +1159,16 @@ void tcg_gen_callN(TCGContext *s, void *func, TCGAr= g ret, =20 static void tcg_reg_alloc_start(TCGContext *s) { - int i; + int i, n; TCGTemp *ts; - for(i =3D 0; i < s->nb_globals; i++) { + + for (i =3D 0, n =3D s->nb_globals; i < n; i++) { ts =3D &s->temps[i]; - if (ts->fixed_reg) { - ts->val_type =3D TEMP_VAL_REG; - } else { - ts->val_type =3D TEMP_VAL_MEM; - } + ts->val_type =3D (ts->fixed_reg ? TEMP_VAL_REG : TEMP_VAL_MEM); } - for(i =3D s->nb_globals; i < s->nb_temps; i++) { + for (n =3D s->nb_temps; i < n; i++) { ts =3D &s->temps[i]; - if (ts->temp_local) { - ts->val_type =3D TEMP_VAL_MEM; - } else { - ts->val_type =3D TEMP_VAL_DEAD; - } + ts->val_type =3D (ts->temp_local ? TEMP_VAL_MEM : TEMP_VAL_DEAD); ts->mem_allocated =3D 0; ts->fixed_reg =3D 0; } @@ -2277,9 +2270,9 @@ static void temp_save(TCGContext *s, TCGTemp *ts, TCG= RegSet allocated_regs) temporary registers needs to be allocated to store a constant. */ static void save_globals(TCGContext *s, TCGRegSet allocated_regs) { - int i; + int i, n; =20 - for (i =3D 0; i < s->nb_globals; i++) { + for (i =3D 0, n =3D s->nb_globals; i < n; i++) { temp_save(s, &s->temps[i], allocated_regs); } } @@ -2289,9 +2282,9 @@ static void save_globals(TCGContext *s, TCGRegSet all= ocated_regs) temporary registers needs to be allocated to store a constant. */ static void sync_globals(TCGContext *s, TCGRegSet allocated_regs) { - int i; + int i, n; =20 - for (i =3D 0; i < s->nb_globals; i++) { + for (i =3D 0, n =3D s->nb_globals; i < n; i++) { TCGTemp *ts =3D &s->temps[i]; tcg_debug_assert(ts->val_type !=3D TEMP_VAL_REG || ts->fixed_reg --=20 2.13.6