diff --git a/bochs/CHANGES b/bochs/CHANGES
index 5d76fc75e..0a25c3bca 100644
--- a/bochs/CHANGES
+++ b/bochs/CHANGES
@@ -45,6 +45,7 @@ Bochs repository moved to the SVN version control !
     - VBE: added HDTV resolutions (patch by Tristan Schmelcher)
 
 - SF patches applied
+  [3289448] optimized powerpc byte swapping by Heikki Lindholm
   [3292581] Core Audio first aid by Heikki Lindholm
   [3205979] Compilation fixes for OpenBSD by Brad Smith
   [3290979] acpi/muldiv64 endian bug by Heikki Lindholm
diff --git a/bochs/bochs.h b/bochs/bochs.h
index 589326ffd..87361d38b 100644
--- a/bochs/bochs.h
+++ b/bochs/bochs.h
@@ -511,19 +511,27 @@ BX_CPP_INLINE Bit16u bx_bswap16(Bit16u val16)
 {
   return (val16<<8) | (val16>>8);
 }
- 
+
+#if BX_HAVE___BUILTIN_BSWAP32
+#define bx_bswap32 __builtin_bswap32
+#else
 BX_CPP_INLINE Bit32u bx_bswap32(Bit32u val32)
 {
   val32 = ((val32<<8) & 0xFF00FF00) | ((val32>>8) & 0x00FF00FF);
   return (val32<<16) | (val32>>16);
 }
+#endif
 
+#if BX_HAVE___BUILTIN_BSWAP64
+#define bx_bswap64 __builtin_bswap64
+#else
 BX_CPP_INLINE Bit64u bx_bswap64(Bit64u val64)
 {
   Bit32u lo = bx_bswap32((Bit32u)(val64 >> 32));
   Bit32u hi = bx_bswap32((Bit32u)(val64 & 0xFFFFFFFF));
   return ((Bit64u)hi << 32) | (Bit64u)lo;
 }
+#endif
 
 // These are some convenience macros which abstract out accesses between
 // a variable in native byte ordering to/from guest (x86) memory, which is
diff --git a/bochs/config.h.in b/bochs/config.h.in
index 0ed8d6962..0a273448b 100644
--- a/bochs/config.h.in
+++ b/bochs/config.h.in
@@ -132,6 +132,9 @@
 #define BX_HAVE_GMTIME 0
 #define BX_HAVE_MKTIME 0
 #define BX_HAVE_NET_IF_H 0
+#define BX_HAVE___BUILTIN_BSWAP16 0
+#define BX_HAVE___BUILTIN_BSWAP32 0
+#define BX_HAVE___BUILTIN_BSWAP64 0
 
 // This turns on Roland Mainz's idle hack.  Presently it is specific to the X11
 // and term gui. If people try to enable it elsewhere, give a compile error
diff --git a/bochs/configure b/bochs/configure
index 480b13e32..6a05d47cc 100755
--- a/bochs/configure
+++ b/bochs/configure
@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.in Id: configure.in 10315 2011-04-20 17:44:00Z sshwarts .
+# From configure.in Id: configure.in 10316 2011-04-21 13:27:42Z sshwarts .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.67.
 #
@@ -20783,6 +20783,69 @@ fi
 done
 
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __builtin_bswap32" >&5
+$as_echo_n "checking for __builtin_bswap32... " >&6; }
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+  __builtin_bswap32(0x12345678);
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+
+
+$as_echo "#define BX_HAVE___BUILTIN_BSWAP32 1" >>confdefs.h
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+
+else
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __builtin_bswap64" >&5
+$as_echo_n "checking for __builtin_bswap64... " >&6; }
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+  __builtin_bswap64(0x12345678);
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+
+
+$as_echo "#define BX_HAVE___BUILTIN_BSWAP64 1" >>confdefs.h
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+
+else
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+
 # Check whether --enable-largefile was given.
 if test "${enable_largefile+set}" = set; then :
   enableval=$enable_largefile;
diff --git a/bochs/configure.in b/bochs/configure.in
index f66b2bb15..f9ed662b6 100644
--- a/bochs/configure.in
+++ b/bochs/configure.in
@@ -159,6 +159,25 @@ AC_CHECK_FUNCS(timelocal, AC_DEFINE(BX_HAVE_TIMELOCAL))
 AC_CHECK_FUNCS(gmtime, AC_DEFINE(BX_HAVE_GMTIME))
 AC_CHECK_FUNCS(mktime, AC_DEFINE(BX_HAVE_MKTIME))
 
+AC_MSG_CHECKING(for __builtin_bswap32)
+AC_TRY_LINK([],[
+  __builtin_bswap32(0x12345678);
+],[
+  AC_DEFINE(BX_HAVE___BUILTIN_BSWAP32, 1, [Define to 1 if you have the '__builtin_bswap32' function.])
+  AC_MSG_RESULT(yes)
+],[
+  AC_MSG_RESULT(no)
+])
+AC_MSG_CHECKING(for __builtin_bswap64)
+AC_TRY_LINK([],[
+  __builtin_bswap64(0x12345678);
+],[
+  AC_DEFINE(BX_HAVE___BUILTIN_BSWAP64, 1, [Define to 1 if you have the '__builtin_bswap64' function.])
+  AC_MSG_RESULT(yes)
+],[
+  AC_MSG_RESULT(no)
+])
+
 dnl As of autoconf 2.53, the standard largefile test fails for Linux/gcc.
 dnl It does not put the largefiles arguments into CFLAGS, even though Linux/gcc
 dnl does need them.  So we do it ourselves.
diff --git a/bochs/cpu/mult64.cc b/bochs/cpu/mult64.cc
index c3c4cd8a5..3285b105f 100644
--- a/bochs/cpu/mult64.cc
+++ b/bochs/cpu/mult64.cc
@@ -312,7 +312,7 @@ void BX_CPP_AttrRegparmN(1) BX_CPU_C::IDIV_RAXEqR(bxInstruction_c *i)
   quotient_64l = quotient_128.lo;
 
   if ((!(quotient_128.lo & BX_CONST64(0x8000000000000000)) && quotient_128.hi != (Bit64s) 0) ||
-        (quotient_128.lo & BX_CONST64(0x8000000000000000)) && quotient_128.hi != (Bit64s) BX_CONST64(0xffffffffffffffff))
+       ((quotient_128.lo & BX_CONST64(0x8000000000000000)) && quotient_128.hi != (Bit64s) BX_CONST64(0xffffffffffffffff)))
   {
     exception(BX_DE_EXCEPTION, 0);
   }
@@ -330,10 +330,10 @@ void BX_CPP_AttrRegparmN(1) BX_CPU_C::IMUL_GqEqIdR(bxInstruction_c *i)
 {
   Bit128s product_128;
 
-  Bit64s op2_64 = BX_READ_64BIT_REG(i->rm());
-  Bit64s op3_64 = (Bit32s) i->Id();
+  Bit64s op1_64 = BX_READ_64BIT_REG(i->rm());
+  Bit64s op2_64 = (Bit32s) i->Id();
 
-  long_imul(&product_128,op2_64,op3_64);
+  long_imul(&product_128,op1_64,op2_64);
 
   /* now write product back to destination */
   BX_WRITE_64BIT_REG(i->nnn(), product_128.lo);