From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:48473) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dIdJP-0000bK-3U for qemu-devel@nongnu.org; Wed, 07 Jun 2017 11:55:59 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dIdJN-0005aD-Ic for qemu-devel@nongnu.org; Wed, 07 Jun 2017 11:55:58 -0400 Received: from mail-qt0-x233.google.com ([2607:f8b0:400d:c0d::233]:33659) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1dIdJN-0005a4-AC for qemu-devel@nongnu.org; Wed, 07 Jun 2017 11:55:57 -0400 Received: by mail-qt0-x233.google.com with SMTP id u12so10820666qth.0 for ; Wed, 07 Jun 2017 08:55:57 -0700 (PDT) Sender: Richard Henderson From: Richard Henderson Date: Wed, 7 Jun 2017 08:55:32 -0700 Message-Id: <20170607155536.1193-4-rth@twiddle.net> In-Reply-To: <20170607155536.1193-1-rth@twiddle.net> References: <20170607155536.1193-1-rth@twiddle.net> Subject: [Qemu-devel] [PATCH v4 3/7] tcg/aarch64: Use ADR in tcg_out_movi List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: cota@braap.org The new placement of the TB means that we can use one insn to load the return value for exit_tb returning the TB pointer. --- tcg/aarch64/tcg-target.inc.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/tcg/aarch64/tcg-target.inc.c b/tcg/aarch64/tcg-target.inc.c index 5f18545..1fa3bcc 100644 --- a/tcg/aarch64/tcg-target.inc.c +++ b/tcg/aarch64/tcg-target.inc.c @@ -616,7 +616,12 @@ static void tcg_out_movi(TCGContext *s, TCGType type, TCGReg rd, /* Look for host pointer values within 4G of the PC. This happens often when loading pointers to QEMU's own data structures. */ if (type == TCG_TYPE_I64) { - tcg_target_long disp = (value >> 12) - ((intptr_t)s->code_ptr >> 12); + tcg_target_long disp = value - (intptr_t)s->code_ptr; + if (disp == sextract64(disp, 0, 21)) { + tcg_out_insn(s, 3406, ADR, rd, disp); + return; + } + disp = (value >> 12) - ((intptr_t)s->code_ptr >> 12); if (disp == sextract64(disp, 0, 21)) { tcg_out_insn(s, 3406, ADRP, rd, disp); if (value & 0xfff) { -- 2.9.4