From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:34130) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gSNlS-0008LU-R1 for qemu-devel@nongnu.org; Thu, 29 Nov 2018 09:58:07 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gSNj8-0003Gf-KE for qemu-devel@nongnu.org; Thu, 29 Nov 2018 09:55:43 -0500 Received: from mail-pg1-x541.google.com ([2607:f8b0:4864:20::541]:39045) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1gSNj8-0003G9-Bp for qemu-devel@nongnu.org; Thu, 29 Nov 2018 09:55:38 -0500 Received: by mail-pg1-x541.google.com with SMTP id w6so1039406pgl.6 for ; Thu, 29 Nov 2018 06:55:38 -0800 (PST) References: <20181123144558.5048-1-richard.henderson@linaro.org> <20181123144558.5048-2-richard.henderson@linaro.org> <8736rk3v2a.fsf@linaro.org> From: Richard Henderson Message-ID: <658996a5-3e74-fc03-75b8-ee258dfa774f@linaro.org> Date: Thu, 29 Nov 2018 06:55:34 -0800 MIME-Version: 1.0 In-Reply-To: <8736rk3v2a.fsf@linaro.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [Qemu-devel] [PATCH for-4.0 v2 01/37] tcg/i386: Always use %ebp for TCG_AREG0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: =?UTF-8?Q?Alex_Benn=c3=a9e?= , qemu-devel@nongnu.org Cc: Alistair.Francis@wdc.com On 11/29/18 4:52 AM, Alex Bennée wrote: > > Richard Henderson writes: > >> For x86_64, this can result in smaller code when manipulating >> TCG_TYPE_I32, as we can omit a REX prefix. > > I take it you mean passing TCG_TYPE_I32 back and forth from the register > backing store in CPUEnv which TCG_AREG0 points at? Yes, exactly. Perhaps I should expand my comment... r~