From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:52497) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1T9da7-0005Ca-US for qemu-devel@nongnu.org; Thu, 06 Sep 2012 11:01:33 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1T9dZx-0007RU-Th for qemu-devel@nongnu.org; Thu, 06 Sep 2012 11:01:23 -0400 Received: from hall.aurel32.net ([88.191.126.93]:44024) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1T9dZx-0007QB-Nj for qemu-devel@nongnu.org; Thu, 06 Sep 2012 11:01:13 -0400 From: Aurelien Jarno Date: Thu, 6 Sep 2012 17:00:54 +0200 Message-Id: <1346943657-17256-6-git-send-email-aurelien@aurel32.net> In-Reply-To: <1346943657-17256-1-git-send-email-aurelien@aurel32.net> References: <1346943657-17256-1-git-send-email-aurelien@aurel32.net> Subject: [Qemu-devel] [PATCH 5/8] tcg/optimize: simplify shift/rot r, 0, a => movi r, 0 cases List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Aurelien Jarno shift/rot r, 0, a is equivalent to movi r, 0. Signed-off-by: Aurelien Jarno --- tcg/optimize.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/tcg/optimize.c b/tcg/optimize.c index c12cb2b..1698ba3 100644 --- a/tcg/optimize.c +++ b/tcg/optimize.c @@ -322,6 +322,26 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr, break; } + /* Simplify expressions for "shift/rot r, 0, a => movi r, 0" */ + switch (op) { + CASE_OP_32_64(shl): + CASE_OP_32_64(shr): + CASE_OP_32_64(sar): + CASE_OP_32_64(rotl): + CASE_OP_32_64(rotr): + if (temps[args[1]].state == TCG_TEMP_CONST + && temps[args[1]].val == 0) { + gen_opc_buf[op_index] = op_to_movi(op); + tcg_opt_gen_movi(gen_args, args[0], 0, nb_temps, nb_globals); + args += 3; + gen_args += 2; + continue; + } + break; + default: + break; + } + /* Simplify expression for "op r, a, 0 => mov r, a" cases */ switch (op) { CASE_OP_32_64(add): -- 1.7.10.4