From a884dcb80451db46b9360c9695b5c55e5d03b16a Mon Sep 17 00:00:00 2001
From: malc <av1474@comtv.ru>
Date: Tue, 6 Apr 2010 02:53:11 +0400
Subject: [PATCH] tcg/ppc: Implment bswap16/32

Signed-off-by: malc <av1474@comtv.ru>
---
 tcg/ppc/tcg-target.c | 75 ++++++++++++++++++++++++++++++++++++++++++++
 tcg/ppc/tcg-target.h |  4 +--
 2 files changed, 77 insertions(+), 2 deletions(-)

diff --git a/tcg/ppc/tcg-target.c b/tcg/ppc/tcg-target.c
index a40883bde0..9fe11bb272 100644
--- a/tcg/ppc/tcg-target.c
+++ b/tcg/ppc/tcg-target.c
@@ -328,6 +328,7 @@ static int tcg_target_const_match(tcg_target_long val,
 #define LWZU   OPCD(33)
 #define STWU   OPCD(37)
 
+#define RLWIMI OPCD(20)
 #define RLWINM OPCD(21)
 #define RLWNM  OPCD(23)
 
@@ -1715,6 +1716,77 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc, const TCGArg *args,
         tcg_out_setcond2 (s, args, const_args);
         break;
 
+    case INDEX_op_bswap16_i32:
+        /* Stolen from gcc's builtin_bswap16 */
+
+        /* a1 = abcd */
+
+        /* r0 = (a1 << 8) & 0xff00 # 00d0 */
+        tcg_out32 (s, RLWINM
+                   | RA (0)
+                   | RS (args[1])
+                   | SH (8)
+                   | MB (16)
+                   | ME (23)
+            );
+
+        /* a0 = rotate_left (a1, 24) & 0xff # 000c */
+        tcg_out32 (s, RLWINM
+                   | RA (args[0])
+                   | RS (args[1])
+                   | SH (24)
+                   | MB (24)
+                   | ME (31)
+            );
+
+        /* a0 = a0 | r0 # 00dc */
+        tcg_out32 (s, OR | SAB (0, args[0], args[0]));
+        break;
+
+    case INDEX_op_bswap32_i32:
+        /* Stolen from gcc's builtin_bswap32 */
+        {
+            int a0 = args[0];
+
+            /* a1 = args[1] # abcd */
+
+            if (a0 == args[1]) {
+                a0 = 0;
+            }
+
+            /* a0 = rotate_left (a1, 8) # bcda */
+            tcg_out32 (s, RLWINM
+                       | RA (a0)
+                       | RS (args[1])
+                       | SH (8)
+                       | MB (0)
+                       | ME (31)
+                );
+
+            /* a0 = (a0 & ~0xff000000) | ((a1 << 24) & 0xff000000) # dcda */
+            tcg_out32 (s, RLWIMI
+                       | RA (a0)
+                       | RS (args[1])
+                       | SH (24)
+                       | MB (0)
+                       | ME (7)
+                );
+
+            /* a0 = (a0 & ~0x0000ff00) | ((a1 << 24) & 0x0000ff00) # dcba */
+            tcg_out32 (s, RLWIMI
+                       | RA (a0)
+                       | RS (args[1])
+                       | SH (24)
+                       | MB (16)
+                       | ME (23)
+                );
+
+            if (!a0) {
+                tcg_out_mov (s, args[0], a0);
+            }
+        }
+        break;
+
     default:
         tcg_dump_ops (s, stderr);
         tcg_abort ();
@@ -1776,6 +1848,9 @@ static const TCGTargetOpDef ppc_op_defs[] = {
     { INDEX_op_setcond_i32, { "r", "r", "ri" } },
     { INDEX_op_setcond2_i32, { "r", "r", "r", "ri", "ri" } },
 
+    { INDEX_op_bswap16_i32, { "r", "r" } },
+    { INDEX_op_bswap32_i32, { "r", "r" } },
+
 #if TARGET_LONG_BITS == 32
     { INDEX_op_qemu_ld8u, { "r", "L" } },
     { INDEX_op_qemu_ld8s, { "r", "L" } },
diff --git a/tcg/ppc/tcg-target.h b/tcg/ppc/tcg-target.h
index d806fe2fe4..53024282da 100644
--- a/tcg/ppc/tcg-target.h
+++ b/tcg/ppc/tcg-target.h
@@ -83,8 +83,8 @@ enum {
 #define TCG_TARGET_HAS_ext16s_i32
 #define TCG_TARGET_HAS_ext8u_i32
 #define TCG_TARGET_HAS_ext16u_i32
-/* #define TCG_TARGET_HAS_bswap16_i32 */
-/* #define TCG_TARGET_HAS_bswap32_i32 */
+#define TCG_TARGET_HAS_bswap16_i32
+#define TCG_TARGET_HAS_bswap32_i32
 #define TCG_TARGET_HAS_not_i32
 #define TCG_TARGET_HAS_neg_i32
 #define TCG_TARGET_HAS_andc_i32