qemu/0077-tcg-optimize-add-constant-folding-for-deposit.patch

From 04edfbcf025b5588e0f3b86c74356a4339745f35 Mon Sep 17 00:00:00 2001
From: Aurelien Jarno <aurelien@aurel32.net>
Date: Fri, 21 Sep 2012 11:07:29 +0200
Subject: [PATCH] tcg/optimize: add constant folding for deposit

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 tcg/optimize.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/tcg/optimize.c b/tcg/optimize.c
index c8ae50b..35532a1 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -668,6 +668,26 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
             }
             args += 3;
             break;
+        CASE_OP_32_64(deposit):
+            if (temps[args[1]].state == TCG_TEMP_CONST
+                && temps[args[2]].state == TCG_TEMP_CONST) {
+                gen_opc_buf[op_index] = op_to_movi(op);
+                tmp = ((1ull << args[4]) - 1);
+                tmp = (temps[args[1]].val & ~(tmp << args[3]))
+                      | ((temps[args[2]].val & tmp) << args[3]);
+                tcg_opt_gen_movi(gen_args, args[0], tmp);
+                gen_args += 2;
+            } else {
+                reset_temp(args[0]);
+                gen_args[0] = args[0];
+                gen_args[1] = args[1];
+                gen_args[2] = args[2];
+                gen_args[3] = args[3];
+                gen_args[4] = args[4];
+                gen_args += 5;
+            }
+            args += 5;
+            break;
         CASE_OP_32_64(setcond):
             tmp = do_constant_folding_cond(op, args[1], args[2], args[3]);
             if (tmp != 2) {
-- 
1.8.0.2