Index: llvm/trunk/test/MC/X86/FXSAVE-32.s
===================================================================
--- llvm/trunk/test/MC/X86/FXSAVE-32.s
+++ llvm/trunk/test/MC/X86/FXSAVE-32.s
@@ -0,0 +1,50 @@
+// RUN: llvm-mc -triple i386-unknown-unknown --show-encoding %s | FileCheck %s
+
+// CHECK: fxrstor -485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0xae,0x8c,0x82,0x10,0xe3,0x0f,0xe3]         
+fxrstor -485498096(%edx,%eax,4) 
+
+// CHECK: fxrstor 485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0xae,0x8c,0x82,0xf0,0x1c,0xf0,0x1c]         
+fxrstor 485498096(%edx,%eax,4) 
+
+// CHECK: fxrstor 485498096(%edx) 
+// CHECK: encoding: [0x0f,0xae,0x8a,0xf0,0x1c,0xf0,0x1c]         
+fxrstor 485498096(%edx) 
+
+// CHECK: fxrstor 485498096 
+// CHECK: encoding: [0x0f,0xae,0x0d,0xf0,0x1c,0xf0,0x1c]         
+fxrstor 485498096 
+
+// CHECK: fxrstor 64(%edx,%eax) 
+// CHECK: encoding: [0x0f,0xae,0x4c,0x02,0x40]         
+fxrstor 64(%edx,%eax) 
+
+// CHECK: fxrstor (%edx) 
+// CHECK: encoding: [0x0f,0xae,0x0a]         
+fxrstor (%edx) 
+
+// CHECK: fxsave -485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0xae,0x84,0x82,0x10,0xe3,0x0f,0xe3]         
+fxsave -485498096(%edx,%eax,4) 
+
+// CHECK: fxsave 485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0xae,0x84,0x82,0xf0,0x1c,0xf0,0x1c]         
+fxsave 485498096(%edx,%eax,4) 
+
+// CHECK: fxsave 485498096(%edx) 
+// CHECK: encoding: [0x0f,0xae,0x82,0xf0,0x1c,0xf0,0x1c]         
+fxsave 485498096(%edx) 
+
+// CHECK: fxsave 485498096 
+// CHECK: encoding: [0x0f,0xae,0x05,0xf0,0x1c,0xf0,0x1c]         
+fxsave 485498096 
+
+// CHECK: fxsave 64(%edx,%eax) 
+// CHECK: encoding: [0x0f,0xae,0x44,0x02,0x40]         
+fxsave 64(%edx,%eax) 
+
+// CHECK: fxsave (%edx) 
+// CHECK: encoding: [0x0f,0xae,0x02]         
+fxsave (%edx) 
+
Index: llvm/trunk/test/MC/X86/FXSAVE-64.s
===================================================================
--- llvm/trunk/test/MC/X86/FXSAVE-64.s
+++ llvm/trunk/test/MC/X86/FXSAVE-64.s
@@ -0,0 +1,50 @@
+// RUN: llvm-mc -triple x86_64-unknown-unknown --show-encoding %s | FileCheck %s
+
+// CHECK: fxrstor 485498096 
+// CHECK: encoding: [0x0f,0xae,0x0c,0x25,0xf0,0x1c,0xf0,0x1c]         
+fxrstor 485498096 
+
+// CHECK: fxrstor 64(%rdx) 
+// CHECK: encoding: [0x0f,0xae,0x4a,0x40]         
+fxrstor 64(%rdx) 
+
+// CHECK: fxrstor 64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0xae,0x4c,0x82,0x40]         
+fxrstor 64(%rdx,%rax,4) 
+
+// CHECK: fxrstor -64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0xae,0x4c,0x82,0xc0]         
+fxrstor -64(%rdx,%rax,4) 
+
+// CHECK: fxrstor 64(%rdx,%rax) 
+// CHECK: encoding: [0x0f,0xae,0x4c,0x02,0x40]         
+fxrstor 64(%rdx,%rax) 
+
+// CHECK: fxrstor (%rdx) 
+// CHECK: encoding: [0x0f,0xae,0x0a]         
+fxrstor (%rdx) 
+
+// CHECK: fxsave 485498096 
+// CHECK: encoding: [0x0f,0xae,0x04,0x25,0xf0,0x1c,0xf0,0x1c]         
+fxsave 485498096 
+
+// CHECK: fxsave 64(%rdx) 
+// CHECK: encoding: [0x0f,0xae,0x42,0x40]         
+fxsave 64(%rdx) 
+
+// CHECK: fxsave 64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0xae,0x44,0x82,0x40]         
+fxsave 64(%rdx,%rax,4) 
+
+// CHECK: fxsave -64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0xae,0x44,0x82,0xc0]         
+fxsave -64(%rdx,%rax,4) 
+
+// CHECK: fxsave 64(%rdx,%rax) 
+// CHECK: encoding: [0x0f,0xae,0x44,0x02,0x40]         
+fxsave 64(%rdx,%rax) 
+
+// CHECK: fxsave (%rdx) 
+// CHECK: encoding: [0x0f,0xae,0x02]         
+fxsave (%rdx) 
+
Index: llvm/trunk/test/MC/X86/FXSAVE64-64.s
===================================================================
--- llvm/trunk/test/MC/X86/FXSAVE64-64.s
+++ llvm/trunk/test/MC/X86/FXSAVE64-64.s
@@ -0,0 +1,50 @@
+// RUN: llvm-mc -triple x86_64-unknown-unknown --show-encoding %s | FileCheck %s
+
+// CHECK: fxrstor64 485498096 
+// CHECK: encoding: [0x48,0x0f,0xae,0x0c,0x25,0xf0,0x1c,0xf0,0x1c]         
+fxrstor64 485498096 
+
+// CHECK: fxrstor64 64(%rdx) 
+// CHECK: encoding: [0x48,0x0f,0xae,0x4a,0x40]         
+fxrstor64 64(%rdx) 
+
+// CHECK: fxrstor64 64(%rdx,%rax,4) 
+// CHECK: encoding: [0x48,0x0f,0xae,0x4c,0x82,0x40]         
+fxrstor64 64(%rdx,%rax,4) 
+
+// CHECK: fxrstor64 -64(%rdx,%rax,4) 
+// CHECK: encoding: [0x48,0x0f,0xae,0x4c,0x82,0xc0]         
+fxrstor64 -64(%rdx,%rax,4) 
+
+// CHECK: fxrstor64 64(%rdx,%rax) 
+// CHECK: encoding: [0x48,0x0f,0xae,0x4c,0x02,0x40]         
+fxrstor64 64(%rdx,%rax) 
+
+// CHECK: fxrstor64 (%rdx) 
+// CHECK: encoding: [0x48,0x0f,0xae,0x0a]         
+fxrstor64 (%rdx) 
+
+// CHECK: fxsave64 485498096 
+// CHECK: encoding: [0x48,0x0f,0xae,0x04,0x25,0xf0,0x1c,0xf0,0x1c]         
+fxsave64 485498096 
+
+// CHECK: fxsave64 64(%rdx) 
+// CHECK: encoding: [0x48,0x0f,0xae,0x42,0x40]         
+fxsave64 64(%rdx) 
+
+// CHECK: fxsave64 64(%rdx,%rax,4) 
+// CHECK: encoding: [0x48,0x0f,0xae,0x44,0x82,0x40]         
+fxsave64 64(%rdx,%rax,4) 
+
+// CHECK: fxsave64 -64(%rdx,%rax,4) 
+// CHECK: encoding: [0x48,0x0f,0xae,0x44,0x82,0xc0]         
+fxsave64 -64(%rdx,%rax,4) 
+
+// CHECK: fxsave64 64(%rdx,%rax) 
+// CHECK: encoding: [0x48,0x0f,0xae,0x44,0x02,0x40]         
+fxsave64 64(%rdx,%rax) 
+
+// CHECK: fxsave64 (%rdx) 
+// CHECK: encoding: [0x48,0x0f,0xae,0x02]         
+fxsave64 (%rdx) 
+
Index: llvm/trunk/test/MC/X86/XSAVE-32.s
===================================================================
--- llvm/trunk/test/MC/X86/XSAVE-32.s
+++ llvm/trunk/test/MC/X86/XSAVE-32.s
@@ -0,0 +1,58 @@
+// RUN: llvm-mc -triple i386-unknown-unknown --show-encoding %s | FileCheck %s
+
+// CHECK: xgetbv 
+// CHECK: encoding: [0x0f,0x01,0xd0]          
+xgetbv 
+
+// CHECK: xrstor -485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0xae,0xac,0x82,0x10,0xe3,0x0f,0xe3]         
+xrstor -485498096(%edx,%eax,4) 
+
+// CHECK: xrstor 485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0xae,0xac,0x82,0xf0,0x1c,0xf0,0x1c]         
+xrstor 485498096(%edx,%eax,4) 
+
+// CHECK: xrstor 485498096(%edx) 
+// CHECK: encoding: [0x0f,0xae,0xaa,0xf0,0x1c,0xf0,0x1c]         
+xrstor 485498096(%edx) 
+
+// CHECK: xrstor 485498096 
+// CHECK: encoding: [0x0f,0xae,0x2d,0xf0,0x1c,0xf0,0x1c]         
+xrstor 485498096 
+
+// CHECK: xrstor 64(%edx,%eax) 
+// CHECK: encoding: [0x0f,0xae,0x6c,0x02,0x40]         
+xrstor 64(%edx,%eax) 
+
+// CHECK: xrstor (%edx) 
+// CHECK: encoding: [0x0f,0xae,0x2a]         
+xrstor (%edx) 
+
+// CHECK: xsave -485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0xae,0xa4,0x82,0x10,0xe3,0x0f,0xe3]         
+xsave -485498096(%edx,%eax,4) 
+
+// CHECK: xsave 485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0xae,0xa4,0x82,0xf0,0x1c,0xf0,0x1c]         
+xsave 485498096(%edx,%eax,4) 
+
+// CHECK: xsave 485498096(%edx) 
+// CHECK: encoding: [0x0f,0xae,0xa2,0xf0,0x1c,0xf0,0x1c]         
+xsave 485498096(%edx) 
+
+// CHECK: xsave 485498096 
+// CHECK: encoding: [0x0f,0xae,0x25,0xf0,0x1c,0xf0,0x1c]         
+xsave 485498096 
+
+// CHECK: xsave 64(%edx,%eax) 
+// CHECK: encoding: [0x0f,0xae,0x64,0x02,0x40]         
+xsave 64(%edx,%eax) 
+
+// CHECK: xsave (%edx) 
+// CHECK: encoding: [0x0f,0xae,0x22]         
+xsave (%edx) 
+
+// CHECK: xsetbv 
+// CHECK: encoding: [0x0f,0x01,0xd1]          
+xsetbv 
+
Index: llvm/trunk/test/MC/X86/XSAVE-64.s
===================================================================
--- llvm/trunk/test/MC/X86/XSAVE-64.s
+++ llvm/trunk/test/MC/X86/XSAVE-64.s
@@ -0,0 +1,106 @@
+// RUN: llvm-mc -triple x86_64-unknown-unknown --show-encoding %s | FileCheck %s
+
+// CHECK: xgetbv 
+// CHECK: encoding: [0x0f,0x01,0xd0]          
+xgetbv 
+
+// CHECK: xrstor 485498096 
+// CHECK: encoding: [0x0f,0xae,0x2c,0x25,0xf0,0x1c,0xf0,0x1c]         
+xrstor 485498096 
+
+// CHECK: xrstor64 485498096 
+// CHECK: encoding: [0x48,0x0f,0xae,0x2c,0x25,0xf0,0x1c,0xf0,0x1c]         
+xrstor64 485498096 
+
+// CHECK: xrstor64 64(%rdx) 
+// CHECK: encoding: [0x48,0x0f,0xae,0x6a,0x40]         
+xrstor64 64(%rdx) 
+
+// CHECK: xrstor64 64(%rdx,%rax,4) 
+// CHECK: encoding: [0x48,0x0f,0xae,0x6c,0x82,0x40]         
+xrstor64 64(%rdx,%rax,4) 
+
+// CHECK: xrstor64 -64(%rdx,%rax,4) 
+// CHECK: encoding: [0x48,0x0f,0xae,0x6c,0x82,0xc0]         
+xrstor64 -64(%rdx,%rax,4) 
+
+// CHECK: xrstor64 64(%rdx,%rax) 
+// CHECK: encoding: [0x48,0x0f,0xae,0x6c,0x02,0x40]         
+xrstor64 64(%rdx,%rax) 
+
+// CHECK: xrstor 64(%rdx) 
+// CHECK: encoding: [0x0f,0xae,0x6a,0x40]         
+xrstor 64(%rdx) 
+
+// CHECK: xrstor64 (%rdx) 
+// CHECK: encoding: [0x48,0x0f,0xae,0x2a]         
+xrstor64 (%rdx) 
+
+// CHECK: xrstor 64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0xae,0x6c,0x82,0x40]         
+xrstor 64(%rdx,%rax,4) 
+
+// CHECK: xrstor -64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0xae,0x6c,0x82,0xc0]         
+xrstor -64(%rdx,%rax,4) 
+
+// CHECK: xrstor 64(%rdx,%rax) 
+// CHECK: encoding: [0x0f,0xae,0x6c,0x02,0x40]         
+xrstor 64(%rdx,%rax) 
+
+// CHECK: xrstor (%rdx) 
+// CHECK: encoding: [0x0f,0xae,0x2a]         
+xrstor (%rdx) 
+
+// CHECK: xsave 485498096 
+// CHECK: encoding: [0x0f,0xae,0x24,0x25,0xf0,0x1c,0xf0,0x1c]         
+xsave 485498096 
+
+// CHECK: xsave64 485498096 
+// CHECK: encoding: [0x48,0x0f,0xae,0x24,0x25,0xf0,0x1c,0xf0,0x1c]         
+xsave64 485498096 
+
+// CHECK: xsave64 64(%rdx) 
+// CHECK: encoding: [0x48,0x0f,0xae,0x62,0x40]         
+xsave64 64(%rdx) 
+
+// CHECK: xsave64 64(%rdx,%rax,4) 
+// CHECK: encoding: [0x48,0x0f,0xae,0x64,0x82,0x40]         
+xsave64 64(%rdx,%rax,4) 
+
+// CHECK: xsave64 -64(%rdx,%rax,4) 
+// CHECK: encoding: [0x48,0x0f,0xae,0x64,0x82,0xc0]         
+xsave64 -64(%rdx,%rax,4) 
+
+// CHECK: xsave64 64(%rdx,%rax) 
+// CHECK: encoding: [0x48,0x0f,0xae,0x64,0x02,0x40]         
+xsave64 64(%rdx,%rax) 
+
+// CHECK: xsave 64(%rdx) 
+// CHECK: encoding: [0x0f,0xae,0x62,0x40]         
+xsave 64(%rdx) 
+
+// CHECK: xsave64 (%rdx) 
+// CHECK: encoding: [0x48,0x0f,0xae,0x22]         
+xsave64 (%rdx) 
+
+// CHECK: xsave 64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0xae,0x64,0x82,0x40]         
+xsave 64(%rdx,%rax,4) 
+
+// CHECK: xsave -64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0xae,0x64,0x82,0xc0]         
+xsave -64(%rdx,%rax,4) 
+
+// CHECK: xsave 64(%rdx,%rax) 
+// CHECK: encoding: [0x0f,0xae,0x64,0x02,0x40]         
+xsave 64(%rdx,%rax) 
+
+// CHECK: xsave (%rdx) 
+// CHECK: encoding: [0x0f,0xae,0x22]         
+xsave (%rdx) 
+
+// CHECK: xsetbv 
+// CHECK: encoding: [0x0f,0x01,0xd1]          
+xsetbv 
+
Index: llvm/trunk/test/MC/X86/XSAVEC-32.s
===================================================================
--- llvm/trunk/test/MC/X86/XSAVEC-32.s
+++ llvm/trunk/test/MC/X86/XSAVEC-32.s
@@ -0,0 +1,26 @@
+// RUN: llvm-mc -triple i386-unknown-unknown --show-encoding %s | FileCheck %s
+
+// CHECK: xsavec -485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0xc7,0xa4,0x82,0x10,0xe3,0x0f,0xe3]         
+xsavec -485498096(%edx,%eax,4) 
+
+// CHECK: xsavec 485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0xc7,0xa4,0x82,0xf0,0x1c,0xf0,0x1c]         
+xsavec 485498096(%edx,%eax,4) 
+
+// CHECK: xsavec 485498096(%edx) 
+// CHECK: encoding: [0x0f,0xc7,0xa2,0xf0,0x1c,0xf0,0x1c]         
+xsavec 485498096(%edx) 
+
+// CHECK: xsavec 485498096 
+// CHECK: encoding: [0x0f,0xc7,0x25,0xf0,0x1c,0xf0,0x1c]         
+xsavec 485498096 
+
+// CHECK: xsavec 64(%edx,%eax) 
+// CHECK: encoding: [0x0f,0xc7,0x64,0x02,0x40]         
+xsavec 64(%edx,%eax) 
+
+// CHECK: xsavec (%edx) 
+// CHECK: encoding: [0x0f,0xc7,0x22]         
+xsavec (%edx) 
+
Index: llvm/trunk/test/MC/X86/XSAVEC-64.s
===================================================================
--- llvm/trunk/test/MC/X86/XSAVEC-64.s
+++ llvm/trunk/test/MC/X86/XSAVEC-64.s
@@ -0,0 +1,50 @@
+// RUN: llvm-mc -triple x86_64-unknown-unknown --show-encoding %s | FileCheck %s
+
+// CHECK: xsavec 485498096 
+// CHECK: encoding: [0x0f,0xc7,0x24,0x25,0xf0,0x1c,0xf0,0x1c]         
+xsavec 485498096 
+
+// CHECK: xsavec64 485498096 
+// CHECK: encoding: [0x48,0x0f,0xc7,0x24,0x25,0xf0,0x1c,0xf0,0x1c]         
+xsavec64 485498096 
+
+// CHECK: xsavec64 64(%rdx) 
+// CHECK: encoding: [0x48,0x0f,0xc7,0x62,0x40]         
+xsavec64 64(%rdx) 
+
+// CHECK: xsavec64 64(%rdx,%rax,4) 
+// CHECK: encoding: [0x48,0x0f,0xc7,0x64,0x82,0x40]         
+xsavec64 64(%rdx,%rax,4) 
+
+// CHECK: xsavec64 -64(%rdx,%rax,4) 
+// CHECK: encoding: [0x48,0x0f,0xc7,0x64,0x82,0xc0]         
+xsavec64 -64(%rdx,%rax,4) 
+
+// CHECK: xsavec64 64(%rdx,%rax) 
+// CHECK: encoding: [0x48,0x0f,0xc7,0x64,0x02,0x40]         
+xsavec64 64(%rdx,%rax) 
+
+// CHECK: xsavec 64(%rdx) 
+// CHECK: encoding: [0x0f,0xc7,0x62,0x40]         
+xsavec 64(%rdx) 
+
+// CHECK: xsavec64 (%rdx) 
+// CHECK: encoding: [0x48,0x0f,0xc7,0x22]         
+xsavec64 (%rdx) 
+
+// CHECK: xsavec 64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0xc7,0x64,0x82,0x40]         
+xsavec 64(%rdx,%rax,4) 
+
+// CHECK: xsavec -64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0xc7,0x64,0x82,0xc0]         
+xsavec -64(%rdx,%rax,4) 
+
+// CHECK: xsavec 64(%rdx,%rax) 
+// CHECK: encoding: [0x0f,0xc7,0x64,0x02,0x40]         
+xsavec 64(%rdx,%rax) 
+
+// CHECK: xsavec (%rdx) 
+// CHECK: encoding: [0x0f,0xc7,0x22]         
+xsavec (%rdx) 
+
Index: llvm/trunk/test/MC/X86/XSAVEOPT-32.s
===================================================================
--- llvm/trunk/test/MC/X86/XSAVEOPT-32.s
+++ llvm/trunk/test/MC/X86/XSAVEOPT-32.s
@@ -0,0 +1,26 @@
+// RUN: llvm-mc -triple i386-unknown-unknown --show-encoding %s | FileCheck %s
+
+// CHECK: xsaveopt -485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0xae,0xb4,0x82,0x10,0xe3,0x0f,0xe3]         
+xsaveopt -485498096(%edx,%eax,4) 
+
+// CHECK: xsaveopt 485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0xae,0xb4,0x82,0xf0,0x1c,0xf0,0x1c]         
+xsaveopt 485498096(%edx,%eax,4) 
+
+// CHECK: xsaveopt 485498096(%edx) 
+// CHECK: encoding: [0x0f,0xae,0xb2,0xf0,0x1c,0xf0,0x1c]         
+xsaveopt 485498096(%edx) 
+
+// CHECK: xsaveopt 485498096 
+// CHECK: encoding: [0x0f,0xae,0x35,0xf0,0x1c,0xf0,0x1c]         
+xsaveopt 485498096 
+
+// CHECK: xsaveopt 64(%edx,%eax) 
+// CHECK: encoding: [0x0f,0xae,0x74,0x02,0x40]         
+xsaveopt 64(%edx,%eax) 
+
+// CHECK: xsaveopt (%edx) 
+// CHECK: encoding: [0x0f,0xae,0x32]         
+xsaveopt (%edx) 
+
Index: llvm/trunk/test/MC/X86/XSAVEOPT-64.s
===================================================================
--- llvm/trunk/test/MC/X86/XSAVEOPT-64.s
+++ llvm/trunk/test/MC/X86/XSAVEOPT-64.s
@@ -0,0 +1,50 @@
+// RUN: llvm-mc -triple x86_64-unknown-unknown --show-encoding %s | FileCheck %s
+
+// CHECK: xsaveopt 485498096 
+// CHECK: encoding: [0x0f,0xae,0x34,0x25,0xf0,0x1c,0xf0,0x1c]         
+xsaveopt 485498096 
+
+// CHECK: xsaveopt64 485498096 
+// CHECK: encoding: [0x48,0x0f,0xae,0x34,0x25,0xf0,0x1c,0xf0,0x1c]         
+xsaveopt64 485498096 
+
+// CHECK: xsaveopt64 64(%rdx) 
+// CHECK: encoding: [0x48,0x0f,0xae,0x72,0x40]         
+xsaveopt64 64(%rdx) 
+
+// CHECK: xsaveopt64 64(%rdx,%rax,4) 
+// CHECK: encoding: [0x48,0x0f,0xae,0x74,0x82,0x40]         
+xsaveopt64 64(%rdx,%rax,4) 
+
+// CHECK: xsaveopt64 -64(%rdx,%rax,4) 
+// CHECK: encoding: [0x48,0x0f,0xae,0x74,0x82,0xc0]         
+xsaveopt64 -64(%rdx,%rax,4) 
+
+// CHECK: xsaveopt64 64(%rdx,%rax) 
+// CHECK: encoding: [0x48,0x0f,0xae,0x74,0x02,0x40]         
+xsaveopt64 64(%rdx,%rax) 
+
+// CHECK: xsaveopt 64(%rdx) 
+// CHECK: encoding: [0x0f,0xae,0x72,0x40]         
+xsaveopt 64(%rdx) 
+
+// CHECK: xsaveopt64 (%rdx) 
+// CHECK: encoding: [0x48,0x0f,0xae,0x32]         
+xsaveopt64 (%rdx) 
+
+// CHECK: xsaveopt 64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0xae,0x74,0x82,0x40]         
+xsaveopt 64(%rdx,%rax,4) 
+
+// CHECK: xsaveopt -64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0xae,0x74,0x82,0xc0]         
+xsaveopt -64(%rdx,%rax,4) 
+
+// CHECK: xsaveopt 64(%rdx,%rax) 
+// CHECK: encoding: [0x0f,0xae,0x74,0x02,0x40]         
+xsaveopt 64(%rdx,%rax) 
+
+// CHECK: xsaveopt (%rdx) 
+// CHECK: encoding: [0x0f,0xae,0x32]         
+xsaveopt (%rdx) 
+
Index: llvm/trunk/test/MC/X86/XSAVES-32.s
===================================================================
--- llvm/trunk/test/MC/X86/XSAVES-32.s
+++ llvm/trunk/test/MC/X86/XSAVES-32.s
@@ -0,0 +1,50 @@
+// RUN: llvm-mc -triple i386-unknown-unknown --show-encoding %s | FileCheck %s
+
+// CHECK: xrstors -485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0xc7,0x9c,0x82,0x10,0xe3,0x0f,0xe3]         
+xrstors -485498096(%edx,%eax,4) 
+
+// CHECK: xrstors 485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0xc7,0x9c,0x82,0xf0,0x1c,0xf0,0x1c]         
+xrstors 485498096(%edx,%eax,4) 
+
+// CHECK: xrstors 485498096(%edx) 
+// CHECK: encoding: [0x0f,0xc7,0x9a,0xf0,0x1c,0xf0,0x1c]         
+xrstors 485498096(%edx) 
+
+// CHECK: xrstors 485498096 
+// CHECK: encoding: [0x0f,0xc7,0x1d,0xf0,0x1c,0xf0,0x1c]         
+xrstors 485498096 
+
+// CHECK: xrstors 64(%edx,%eax) 
+// CHECK: encoding: [0x0f,0xc7,0x5c,0x02,0x40]         
+xrstors 64(%edx,%eax) 
+
+// CHECK: xrstors (%edx) 
+// CHECK: encoding: [0x0f,0xc7,0x1a]         
+xrstors (%edx) 
+
+// CHECK: xsaves -485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0xc7,0xac,0x82,0x10,0xe3,0x0f,0xe3]         
+xsaves -485498096(%edx,%eax,4) 
+
+// CHECK: xsaves 485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0xc7,0xac,0x82,0xf0,0x1c,0xf0,0x1c]         
+xsaves 485498096(%edx,%eax,4) 
+
+// CHECK: xsaves 485498096(%edx) 
+// CHECK: encoding: [0x0f,0xc7,0xaa,0xf0,0x1c,0xf0,0x1c]         
+xsaves 485498096(%edx) 
+
+// CHECK: xsaves 485498096 
+// CHECK: encoding: [0x0f,0xc7,0x2d,0xf0,0x1c,0xf0,0x1c]         
+xsaves 485498096 
+
+// CHECK: xsaves 64(%edx,%eax) 
+// CHECK: encoding: [0x0f,0xc7,0x6c,0x02,0x40]         
+xsaves 64(%edx,%eax) 
+
+// CHECK: xsaves (%edx) 
+// CHECK: encoding: [0x0f,0xc7,0x2a]         
+xsaves (%edx) 
+
Index: llvm/trunk/test/MC/X86/XSAVES-64.s
===================================================================
--- llvm/trunk/test/MC/X86/XSAVES-64.s
+++ llvm/trunk/test/MC/X86/XSAVES-64.s
@@ -0,0 +1,98 @@
+// RUN: llvm-mc -triple x86_64-unknown-unknown --show-encoding %s | FileCheck %s
+
+// CHECK: xrstors 485498096 
+// CHECK: encoding: [0x0f,0xc7,0x1c,0x25,0xf0,0x1c,0xf0,0x1c]         
+xrstors 485498096 
+
+// CHECK: xrstors64 485498096 
+// CHECK: encoding: [0x48,0x0f,0xc7,0x1c,0x25,0xf0,0x1c,0xf0,0x1c]         
+xrstors64 485498096 
+
+// CHECK: xrstors64 64(%rdx) 
+// CHECK: encoding: [0x48,0x0f,0xc7,0x5a,0x40]         
+xrstors64 64(%rdx) 
+
+// CHECK: xrstors64 64(%rdx,%rax,4) 
+// CHECK: encoding: [0x48,0x0f,0xc7,0x5c,0x82,0x40]         
+xrstors64 64(%rdx,%rax,4) 
+
+// CHECK: xrstors64 -64(%rdx,%rax,4) 
+// CHECK: encoding: [0x48,0x0f,0xc7,0x5c,0x82,0xc0]         
+xrstors64 -64(%rdx,%rax,4) 
+
+// CHECK: xrstors64 64(%rdx,%rax) 
+// CHECK: encoding: [0x48,0x0f,0xc7,0x5c,0x02,0x40]         
+xrstors64 64(%rdx,%rax) 
+
+// CHECK: xrstors 64(%rdx) 
+// CHECK: encoding: [0x0f,0xc7,0x5a,0x40]         
+xrstors 64(%rdx) 
+
+// CHECK: xrstors64 (%rdx) 
+// CHECK: encoding: [0x48,0x0f,0xc7,0x1a]         
+xrstors64 (%rdx) 
+
+// CHECK: xrstors 64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0xc7,0x5c,0x82,0x40]         
+xrstors 64(%rdx,%rax,4) 
+
+// CHECK: xrstors -64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0xc7,0x5c,0x82,0xc0]         
+xrstors -64(%rdx,%rax,4) 
+
+// CHECK: xrstors 64(%rdx,%rax) 
+// CHECK: encoding: [0x0f,0xc7,0x5c,0x02,0x40]         
+xrstors 64(%rdx,%rax) 
+
+// CHECK: xrstors (%rdx) 
+// CHECK: encoding: [0x0f,0xc7,0x1a]         
+xrstors (%rdx) 
+
+// CHECK: xsaves 485498096 
+// CHECK: encoding: [0x0f,0xc7,0x2c,0x25,0xf0,0x1c,0xf0,0x1c]         
+xsaves 485498096 
+
+// CHECK: xsaves64 485498096 
+// CHECK: encoding: [0x48,0x0f,0xc7,0x2c,0x25,0xf0,0x1c,0xf0,0x1c]         
+xsaves64 485498096 
+
+// CHECK: xsaves64 64(%rdx) 
+// CHECK: encoding: [0x48,0x0f,0xc7,0x6a,0x40]         
+xsaves64 64(%rdx) 
+
+// CHECK: xsaves64 64(%rdx,%rax,4) 
+// CHECK: encoding: [0x48,0x0f,0xc7,0x6c,0x82,0x40]         
+xsaves64 64(%rdx,%rax,4) 
+
+// CHECK: xsaves64 -64(%rdx,%rax,4) 
+// CHECK: encoding: [0x48,0x0f,0xc7,0x6c,0x82,0xc0]         
+xsaves64 -64(%rdx,%rax,4) 
+
+// CHECK: xsaves64 64(%rdx,%rax) 
+// CHECK: encoding: [0x48,0x0f,0xc7,0x6c,0x02,0x40]         
+xsaves64 64(%rdx,%rax) 
+
+// CHECK: xsaves 64(%rdx) 
+// CHECK: encoding: [0x0f,0xc7,0x6a,0x40]         
+xsaves 64(%rdx) 
+
+// CHECK: xsaves64 (%rdx) 
+// CHECK: encoding: [0x48,0x0f,0xc7,0x2a]         
+xsaves64 (%rdx) 
+
+// CHECK: xsaves 64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0xc7,0x6c,0x82,0x40]         
+xsaves 64(%rdx,%rax,4) 
+
+// CHECK: xsaves -64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0xc7,0x6c,0x82,0xc0]         
+xsaves -64(%rdx,%rax,4) 
+
+// CHECK: xsaves 64(%rdx,%rax) 
+// CHECK: encoding: [0x0f,0xc7,0x6c,0x02,0x40]         
+xsaves 64(%rdx,%rax) 
+
+// CHECK: xsaves (%rdx) 
+// CHECK: encoding: [0x0f,0xc7,0x2a]         
+xsaves (%rdx) 
+