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[97.126.104.76]) by smtp.gmail.com with ESMTPSA id i187sm5594249pfc.96.2017.10.16.10.26.25 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 16 Oct 2017 10:26:26 -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=14UnMYMoZqmrJ9oz6osYwF58UTet1QjRnDjyBDt55ag=; b=As0pz48359ajQ6Ug9EXlJEMwQrr+/sBS2QWjxNai+8p5WVwOfF/3fhxDhd/KPcwzyt cWCxYnHDyAMA1I1wR8su2o/xtzhG4R8Czl3zkg0nSRbBH8v/Jj1AgL0kBSjehiIdz6us y8Imv7uxHkCYAxQuD+ZTCX1xHefxk52O13iMk= 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=14UnMYMoZqmrJ9oz6osYwF58UTet1QjRnDjyBDt55ag=; b=C+ufwKSvNESbtYGEZuDZ1xO1r5P2w0Ih2hgT19R+GMgkvKJNyJzEzcf9bl34RzhNBN lIA36VjVSI18BA7n5woZCky5cRpwyUu3E1UMBbABND/hBcrSlDcQE2U5DFzp2JTLONmX 6pkklOCCa+6rL5qesImLY+rbpp80nuOW+DvqKDOuiokitlYo8FYktjzn97YrRbY62Leo TTBiORMN+ag5kivSexfWOwKo6v8QefmGGsyKYNnRDWXijmD7tNu+yiy+ylc4dL1Voh76 HvebcZ7EHC4BPbeGTuB4SJ2GS+YnrD2JhI4vtDwSeRlfKF/iUAhsIWQekIyop2tjh0U7 7qbw== X-Gm-Message-State: AMCzsaXMfjtUMc5FQCHT5CpcbaIG6mOhpqb4sXVYQz05IVhR7UoQarZa klk+O1zmZ8ixVAgi+Dmjjpf5cMISRpU= X-Google-Smtp-Source: AOwi7QCNegFNvChZ1UiFH9u0w7h60vCqBUCeCCRnDWwYOAsV4p3oDLl8Phm4hNZNwg+khhZZQk0W5g== X-Received: by 10.84.135.101 with SMTP id 92mr9657204pli.180.1508174787215; Mon, 16 Oct 2017 10:26:27 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Date: Mon, 16 Oct 2017 10:25:29 -0700 Message-Id: <20171016172609.23422-11-richard.henderson@linaro.org> X-Mailer: git-send-email 2.13.6 In-Reply-To: <20171016172609.23422-1-richard.henderson@linaro.org> References: <20171016172609.23422-1-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:c05::234 Subject: [Qemu-devel] [PATCH v6 10/50] 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: cota@braap.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: Alex Benn=C3=A9e Signed-off-by: Richard Henderson Reviewed-by: Emilio G. Cota --- tcg/tcg.c | 27 ++++++++++----------------- 1 file changed, 10 insertions(+), 17 deletions(-) diff --git a/tcg/tcg.c b/tcg/tcg.c index 719db9f2b6..bb342e06dd 100644 --- a/tcg/tcg.c +++ b/tcg/tcg.c @@ -1166,23 +1166,16 @@ 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; } @@ -2284,9 +2277,9 @@ 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); } } @@ -2296,9 +2289,9 @@ 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