From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:35463) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TJ7HJ-00047H-B8 for qemu-devel@nongnu.org; Tue, 02 Oct 2012 14:33:15 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1TJ7HH-0007cB-47 for qemu-devel@nongnu.org; Tue, 02 Oct 2012 14:33:09 -0400 Received: from mail-pa0-f45.google.com ([209.85.220.45]:55783) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TJ7HG-0007bu-Uc for qemu-devel@nongnu.org; Tue, 02 Oct 2012 14:33:07 -0400 Received: by padfb10 with SMTP id fb10so5568448pad.4 for ; Tue, 02 Oct 2012 11:33:06 -0700 (PDT) Sender: Richard Henderson From: Richard Henderson Date: Tue, 2 Oct 2012 11:32:23 -0700 Message-Id: <1349202750-16815-4-git-send-email-rth@twiddle.net> In-Reply-To: <1349202750-16815-1-git-send-email-rth@twiddle.net> References: <1349202750-16815-1-git-send-email-rth@twiddle.net> Subject: [Qemu-devel] [PATCH 03/10] tcg: Swap commutative double-word comparisons List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Aurelien Jarno Signed-off-by: Richard Henderson --- tcg/optimize.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/tcg/optimize.c b/tcg/optimize.c index 3539826..a713513 100644 --- a/tcg/optimize.c +++ b/tcg/optimize.c @@ -399,6 +399,22 @@ static bool swap_commutative(TCGArg dest, TCGArg *p1, TCGArg *p2) return false; } +static bool swap_commutative2(TCGArg *p1, TCGArg *p2) +{ + int sum = 0; + sum += temps[p1[0]].state == TCG_TEMP_CONST; + sum += temps[p1[1]].state == TCG_TEMP_CONST; + sum -= temps[p2[0]].state == TCG_TEMP_CONST; + sum -= temps[p2[1]].state == TCG_TEMP_CONST; + if (sum > 0) { + TCGArg t; + t = p1[0], p1[0] = p2[0], p2[0] = t; + t = p1[1], p1[1] = p2[1], p2[1] = t; + return true; + } + return false; +} + /* Propagate constants and copies, fold constant expressions. */ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr, TCGArg *args, TCGOpDef *tcg_op_defs) @@ -477,6 +493,16 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr, swap_commutative(args[0], &args[2], &args[4]); swap_commutative(args[1], &args[3], &args[5]); break; + case INDEX_op_brcond2_i32: + if (swap_commutative2(&args[0], &args[2])) { + args[4] = tcg_swap_cond(args[4]); + } + break; + case INDEX_op_setcond2_i32: + if (swap_commutative2(&args[1], &args[3])) { + args[5] = tcg_swap_cond(args[5]); + } + break; default: break; } -- 1.7.11.4