diff --git a/src/arch/Makefile b/src/arch/Makefile
index ae43986..3765a34 100644
--- a/src/arch/Makefile
+++ b/src/arch/Makefile
@@ -72,7 +72,7 @@ i486.o: i486.c common.ins null.ins i386.h i386.ins i386.reg i486.ins
 i586.o: i586.c common.ins null.ins i386.h i386.ins i386.reg i486.ins i586.ins
 	$(CC) $(i586_CFLAGS) -c i586.c
 
-i686.o: i686.c common.ins null.ins i386.h i386.ins i386.reg i486.ins i686.reg
+i686.o: i686.c common.ins null.ins i386.h i386.ins i386.reg i486.ins i686.ins i686.reg
 	$(CC) $(i686_CFLAGS) -c i686.c
 
 sparc.o: sparc.c common.ins null.ins sparc.ins sparc.reg
diff --git a/src/arch/i386.ins b/src/arch/i386.ins
index cf29bf4..09a93c1 100644
--- a/src/arch/i386.ins
+++ b/src/arch/i386.ins
@@ -419,6 +419,14 @@
 { "fwait",	0x9b,		OP1F, AOT_NONE,   AOT_NONE,  AOT_NONE	},
 /* NOP		0x90		1					*/
 { "nop",	0x90,		OP1F, AOT_NONE,   AOT_NONE,  AOT_NONE	},
+/* RCL									*/
+/* FIXME implement */
+/* RCR									*/
+/* FIXME implement */
+/* ROL									*/
+/* FIXME implement */
+/* ROR									*/
+/* FIXME implement */
 /* REP									*/
 /* FIXME implement */
 /* RET		0xc2		1     imm16				*/
diff --git a/src/arch/i686.ins b/src/arch/i686.ins
index 505c936..f8359d8 100644
--- a/src/arch/i686.ins
+++ b/src/arch/i686.ins
@@ -15,6 +15,23 @@
 
 
 
+/* helpers */
+/* mod r/m byte */
+#define OP_R64		AO_REGISTER(0, 64, 0)
+#define OP_R64_R	AO_REGISTER(AOF_I386_MODRM, 64, 8)
+#define OP_RM64_D0_R	AO_DREGISTER(AOF_I386_MODRM, 0, W, 8)
+#define OP_RM64_D8_R	AO_DREGISTER(AOF_I386_MODRM, 8, W, 8)
+#define OP_RM64_DW_R	AO_DREGISTER(AOF_I386_MODRM, W, W, 8)
+#define OP_RM64_R64_R	AO_REGISTER(AOF_I386_MODRM, 64, 8)
+
+
 /* instructions */
 /* EMMS		0x0f77		2					*/
 { "emms",	0x0f77,		OP2F, AOT_NONE,    AOT_NONE,   AOT_NONE	},
+/* PXOR		0x0fef /r	2     mm           mm/m64		*/
+#if 1 /* FIXME doesn't work properly */
+{ "pxor",	0x0fef,		OP2F, OP_R64_R,    OP_RM64_D0_R,AOT_NONE},
+{ "pxor",	0x0fef,		OP2F, OP_R64_R,    OP_RM64_D8_R,AOT_NONE},
+{ "pxor",	0x0fef,		OP2F, OP_R64_R,    OP_RM64_DW_R,AOT_NONE},
+{ "pxor",	0x0fef,		OP2F, OP_R64_R,    OP_RM64_R64_R,AOT_NONE},
+#endif
diff --git a/src/arch/i686.reg b/src/arch/i686.reg
index 107227f..40911d9 100644
--- a/src/arch/i686.reg
+++ b/src/arch/i686.reg
@@ -1,9 +1,9 @@
 /* $Id$ */
-REG(mm0, 64,	0x08)
-REG(mm1, 64,	0x09)
-REG(mm2, 64,	0x0a)
-REG(mm3, 64,	0x0b)
-REG(mm4, 64,	0x0c)
-REG(mm5, 64,	0x0d)
-REG(mm6, 64,	0x0e)
-REG(mm7, 64,	0x0f)
+REG(mm0, 64,	0x00)
+REG(mm1, 64,	0x01)
+REG(mm2, 64,	0x02)
+REG(mm3, 64,	0x03)
+REG(mm4, 64,	0x04)
+REG(mm5, 64,	0x05)
+REG(mm6, 64,	0x06)
+REG(mm7, 64,	0x07)
diff --git a/src/arch/project.conf b/src/arch/project.conf
index 6d9f21a..dadf05b 100644
--- a/src/arch/project.conf
+++ b/src/arch/project.conf
@@ -42,7 +42,7 @@ sources=i686.c
 install=$(LIBDIR)/asm/arch
 
 [i686.c]
-depends=common.ins,null.ins,i386.h,i386.ins,i386.reg,i486.ins,i686.reg
+depends=common.ins,null.ins,i386.h,i386.ins,i386.reg,i486.ins,i686.ins,i686.reg
 
 [sparc]
 type=plugin
diff --git a/test/i686.S b/test/i686.S
index aa6c30a..c051421 100644
--- a/test/i686.S
+++ b/test/i686.S
@@ -1,3 +1,9 @@
 /* $Id$ */
 .text
 	emms					/* 0f 77		*/
+#if 1 /* FIXME doesn't work properly */
+	pxor	%mm1, [%edx]
+	pxor	%mm2, [%edx + $0x56]
+	pxor	%mm3, [%edx + $0x789abc]
+	pxor	%mm4, %mm5
+#endif