Index: lldb/source/Plugins/Process/Utility/RegisterContextPOSIX_x86.h
===================================================================
--- lldb/source/Plugins/Process/Utility/RegisterContextPOSIX_x86.h
+++ lldb/source/Plugins/Process/Utility/RegisterContextPOSIX_x86.h
@@ -112,6 +112,42 @@
   static uint32_t g_invalidate_fip[];
   static uint32_t g_invalidate_fdp[];
 
+  static uint32_t g_contained_st0_32[];
+  static uint32_t g_contained_st1_32[];
+  static uint32_t g_contained_st2_32[];
+  static uint32_t g_contained_st3_32[];
+  static uint32_t g_contained_st4_32[];
+  static uint32_t g_contained_st5_32[];
+  static uint32_t g_contained_st6_32[];
+  static uint32_t g_contained_st7_32[];
+
+  static uint32_t g_invalidate_st0_32[];
+  static uint32_t g_invalidate_st1_32[];
+  static uint32_t g_invalidate_st2_32[];
+  static uint32_t g_invalidate_st3_32[];
+  static uint32_t g_invalidate_st4_32[];
+  static uint32_t g_invalidate_st5_32[];
+  static uint32_t g_invalidate_st6_32[];
+  static uint32_t g_invalidate_st7_32[];
+
+  static uint32_t g_contained_st0_64[];
+  static uint32_t g_contained_st1_64[];
+  static uint32_t g_contained_st2_64[];
+  static uint32_t g_contained_st3_64[];
+  static uint32_t g_contained_st4_64[];
+  static uint32_t g_contained_st5_64[];
+  static uint32_t g_contained_st6_64[];
+  static uint32_t g_contained_st7_64[];
+
+  static uint32_t g_invalidate_st0_64[];
+  static uint32_t g_invalidate_st1_64[];
+  static uint32_t g_invalidate_st2_64[];
+  static uint32_t g_invalidate_st3_64[];
+  static uint32_t g_invalidate_st4_64[];
+  static uint32_t g_invalidate_st5_64[];
+  static uint32_t g_invalidate_st6_64[];
+  static uint32_t g_invalidate_st7_64[];
+
 protected:
   struct RegInfo {
     uint32_t num_registers;
Index: lldb/source/Plugins/Process/Utility/RegisterContextPOSIX_x86.cpp
===================================================================
--- lldb/source/Plugins/Process/Utility/RegisterContextPOSIX_x86.cpp
+++ lldb/source/Plugins/Process/Utility/RegisterContextPOSIX_x86.cpp
@@ -286,6 +286,74 @@
 uint32_t RegisterContextPOSIX_x86::g_invalidate_fdp[] = {
     lldb_fdp_x86_64, lldb_fooff_x86_64, lldb_foseg_x86_64, LLDB_INVALID_REGNUM};
 
+uint32_t RegisterContextPOSIX_x86::g_contained_st0_32[] = {lldb_st0_i386,
+                                                           LLDB_INVALID_REGNUM};
+uint32_t RegisterContextPOSIX_x86::g_contained_st1_32[] = {lldb_st1_i386,
+                                                           LLDB_INVALID_REGNUM};
+uint32_t RegisterContextPOSIX_x86::g_contained_st2_32[] = {lldb_st2_i386,
+                                                           LLDB_INVALID_REGNUM};
+uint32_t RegisterContextPOSIX_x86::g_contained_st3_32[] = {lldb_st3_i386,
+                                                           LLDB_INVALID_REGNUM};
+uint32_t RegisterContextPOSIX_x86::g_contained_st4_32[] = {lldb_st4_i386,
+                                                           LLDB_INVALID_REGNUM};
+uint32_t RegisterContextPOSIX_x86::g_contained_st5_32[] = {lldb_st5_i386,
+                                                           LLDB_INVALID_REGNUM};
+uint32_t RegisterContextPOSIX_x86::g_contained_st6_32[] = {lldb_st6_i386,
+                                                           LLDB_INVALID_REGNUM};
+uint32_t RegisterContextPOSIX_x86::g_contained_st7_32[] = {lldb_st7_i386,
+                                                           LLDB_INVALID_REGNUM};
+
+uint32_t RegisterContextPOSIX_x86::g_invalidate_st0_32[] = {
+    lldb_st0_i386, lldb_mm0_i386, LLDB_INVALID_REGNUM};
+uint32_t RegisterContextPOSIX_x86::g_invalidate_st1_32[] = {
+    lldb_st1_i386, lldb_mm1_i386, LLDB_INVALID_REGNUM};
+uint32_t RegisterContextPOSIX_x86::g_invalidate_st2_32[] = {
+    lldb_st2_i386, lldb_mm2_i386, LLDB_INVALID_REGNUM};
+uint32_t RegisterContextPOSIX_x86::g_invalidate_st3_32[] = {
+    lldb_st3_i386, lldb_mm3_i386, LLDB_INVALID_REGNUM};
+uint32_t RegisterContextPOSIX_x86::g_invalidate_st4_32[] = {
+    lldb_st4_i386, lldb_mm4_i386, LLDB_INVALID_REGNUM};
+uint32_t RegisterContextPOSIX_x86::g_invalidate_st5_32[] = {
+    lldb_st5_i386, lldb_mm5_i386, LLDB_INVALID_REGNUM};
+uint32_t RegisterContextPOSIX_x86::g_invalidate_st6_32[] = {
+    lldb_st6_i386, lldb_mm6_i386, LLDB_INVALID_REGNUM};
+uint32_t RegisterContextPOSIX_x86::g_invalidate_st7_32[] = {
+    lldb_st7_i386, lldb_mm7_i386, LLDB_INVALID_REGNUM};
+
+uint32_t RegisterContextPOSIX_x86::g_contained_st0_64[] = {lldb_st0_x86_64,
+                                                           LLDB_INVALID_REGNUM};
+uint32_t RegisterContextPOSIX_x86::g_contained_st1_64[] = {lldb_st1_x86_64,
+                                                           LLDB_INVALID_REGNUM};
+uint32_t RegisterContextPOSIX_x86::g_contained_st2_64[] = {lldb_st2_x86_64,
+                                                           LLDB_INVALID_REGNUM};
+uint32_t RegisterContextPOSIX_x86::g_contained_st3_64[] = {lldb_st3_x86_64,
+                                                           LLDB_INVALID_REGNUM};
+uint32_t RegisterContextPOSIX_x86::g_contained_st4_64[] = {lldb_st4_x86_64,
+                                                           LLDB_INVALID_REGNUM};
+uint32_t RegisterContextPOSIX_x86::g_contained_st5_64[] = {lldb_st5_x86_64,
+                                                           LLDB_INVALID_REGNUM};
+uint32_t RegisterContextPOSIX_x86::g_contained_st6_64[] = {lldb_st6_x86_64,
+                                                           LLDB_INVALID_REGNUM};
+uint32_t RegisterContextPOSIX_x86::g_contained_st7_64[] = {lldb_st7_x86_64,
+                                                           LLDB_INVALID_REGNUM};
+
+uint32_t RegisterContextPOSIX_x86::g_invalidate_st0_64[] = {
+    lldb_st0_x86_64, lldb_mm0_x86_64, LLDB_INVALID_REGNUM};
+uint32_t RegisterContextPOSIX_x86::g_invalidate_st1_64[] = {
+    lldb_st1_x86_64, lldb_mm1_x86_64, LLDB_INVALID_REGNUM};
+uint32_t RegisterContextPOSIX_x86::g_invalidate_st2_64[] = {
+    lldb_st2_x86_64, lldb_mm2_x86_64, LLDB_INVALID_REGNUM};
+uint32_t RegisterContextPOSIX_x86::g_invalidate_st3_64[] = {
+    lldb_st3_x86_64, lldb_mm3_x86_64, LLDB_INVALID_REGNUM};
+uint32_t RegisterContextPOSIX_x86::g_invalidate_st4_64[] = {
+    lldb_st4_x86_64, lldb_mm4_x86_64, LLDB_INVALID_REGNUM};
+uint32_t RegisterContextPOSIX_x86::g_invalidate_st5_64[] = {
+    lldb_st5_x86_64, lldb_mm5_x86_64, LLDB_INVALID_REGNUM};
+uint32_t RegisterContextPOSIX_x86::g_invalidate_st6_64[] = {
+    lldb_st6_x86_64, lldb_mm6_x86_64, LLDB_INVALID_REGNUM};
+uint32_t RegisterContextPOSIX_x86::g_invalidate_st7_64[] = {
+    lldb_st7_x86_64, lldb_mm7_x86_64, LLDB_INVALID_REGNUM};
+
 // Number of register sets provided by this context.
 enum { k_num_extended_register_sets = 1, k_num_register_sets = 3 };
 
Index: lldb/source/Plugins/Process/Utility/RegisterInfos_i386.h
===================================================================
--- lldb/source/Plugins/Process/Utility/RegisterInfos_i386.h
+++ lldb/source/Plugins/Process/Utility/RegisterInfos_i386.h
@@ -87,15 +87,14 @@
              nullptr, nullptr, nullptr, 0                                      \
   }
 
-#define DEFINE_FP_MM(reg, i)                                                   \
+#define DEFINE_FP_MM(reg, i, streg)                                            \
   {                                                                            \
-    #reg #i, nullptr, sizeof(uint64_t),                                        \
-                          LLVM_EXTENSION FPR_OFFSET(                           \
-                              stmm[i]), eEncodingUint, eFormatHex,             \
-                              {ehframe_mm##i##_i386, dwarf_mm##i##_i386,       \
-                               LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,       \
-                               lldb_mm##i##_i386 },                            \
-                               nullptr, nullptr, nullptr, 0                    \
+    #reg #i, nullptr, sizeof(uint64_t), LLVM_EXTENSION FPR_OFFSET(stmm[i]),    \
+    eEncodingUint, eFormatHex,                                                 \
+    {dwarf_mm##i##_i386, dwarf_mm##i##_i386, LLDB_INVALID_REGNUM,              \
+     LLDB_INVALID_REGNUM, lldb_mm##i##_i386 },                                 \
+    RegisterContextPOSIX_x86::g_contained_##streg##_32,                        \
+    RegisterContextPOSIX_x86::g_invalidate_##streg##_32, nullptr, 0            \
   }
 
 #define DEFINE_XMM(reg, i)                                                     \
@@ -251,10 +250,12 @@
     // FP registers.
     DEFINE_FP_ST(st, 0), DEFINE_FP_ST(st, 1), DEFINE_FP_ST(st, 2),
     DEFINE_FP_ST(st, 3), DEFINE_FP_ST(st, 4), DEFINE_FP_ST(st, 5),
-    DEFINE_FP_ST(st, 6), DEFINE_FP_ST(st, 7), DEFINE_FP_MM(mm, 0),
-    DEFINE_FP_MM(mm, 1), DEFINE_FP_MM(mm, 2), DEFINE_FP_MM(mm, 3),
-    DEFINE_FP_MM(mm, 4), DEFINE_FP_MM(mm, 5), DEFINE_FP_MM(mm, 6),
-    DEFINE_FP_MM(mm, 7),
+    DEFINE_FP_ST(st, 6), DEFINE_FP_ST(st, 7),
+
+    DEFINE_FP_MM(mm, 0, st0), DEFINE_FP_MM(mm, 1, st1),
+    DEFINE_FP_MM(mm, 2, st2), DEFINE_FP_MM(mm, 3, st3),
+    DEFINE_FP_MM(mm, 4, st4), DEFINE_FP_MM(mm, 5, st5),
+    DEFINE_FP_MM(mm, 6, st6), DEFINE_FP_MM(mm, 7, st7),
 
     // XMM registers
     DEFINE_XMM(xmm, 0), DEFINE_XMM(xmm, 1), DEFINE_XMM(xmm, 2),
Index: lldb/source/Plugins/Process/Utility/RegisterInfos_x86_64.h
===================================================================
--- lldb/source/Plugins/Process/Utility/RegisterInfos_x86_64.h
+++ lldb/source/Plugins/Process/Utility/RegisterInfos_x86_64.h
@@ -88,15 +88,14 @@
              nullptr, nullptr, nullptr, 0                                      \
   }
 
-#define DEFINE_FP_MM(reg, i)                                                   \
+#define DEFINE_FP_MM(reg, i, streg)                                            \
   {                                                                            \
-    #reg #i, nullptr, sizeof(uint64_t),                                        \
-                          LLVM_EXTENSION FPR_OFFSET(                           \
-                              stmm[i]), eEncodingUint, eFormatHex,             \
-                              {dwarf_mm##i##_x86_64, dwarf_mm##i##_x86_64,     \
-                               LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,       \
-                               lldb_mm##i##_x86_64 },                          \
-                               nullptr, nullptr, nullptr, 0                    \
+    #reg #i, nullptr, sizeof(uint64_t), LLVM_EXTENSION FPR_OFFSET(stmm[i]),    \
+    eEncodingUint, eFormatHex,                                                 \
+    {dwarf_mm##i##_x86_64, dwarf_mm##i##_x86_64, LLDB_INVALID_REGNUM,          \
+     LLDB_INVALID_REGNUM, lldb_mm##i##_x86_64 },                               \
+    RegisterContextPOSIX_x86::g_contained_##streg##_64,                        \
+    RegisterContextPOSIX_x86::g_invalidate_##streg##_64, nullptr, 0            \
   }
 
 #define DEFINE_XMM(reg, i)                                                     \
@@ -277,10 +276,12 @@
     // FP registers.
     DEFINE_FP_ST(st, 0), DEFINE_FP_ST(st, 1), DEFINE_FP_ST(st, 2),
     DEFINE_FP_ST(st, 3), DEFINE_FP_ST(st, 4), DEFINE_FP_ST(st, 5),
-    DEFINE_FP_ST(st, 6), DEFINE_FP_ST(st, 7), DEFINE_FP_MM(mm, 0),
-    DEFINE_FP_MM(mm, 1), DEFINE_FP_MM(mm, 2), DEFINE_FP_MM(mm, 3),
-    DEFINE_FP_MM(mm, 4), DEFINE_FP_MM(mm, 5), DEFINE_FP_MM(mm, 6),
-    DEFINE_FP_MM(mm, 7),
+    DEFINE_FP_ST(st, 6), DEFINE_FP_ST(st, 7),
+
+    DEFINE_FP_MM(mm, 0, st0), DEFINE_FP_MM(mm, 1, st1),
+    DEFINE_FP_MM(mm, 2, st2), DEFINE_FP_MM(mm, 3, st3),
+    DEFINE_FP_MM(mm, 4, st4), DEFINE_FP_MM(mm, 5, st5),
+    DEFINE_FP_MM(mm, 6, st6), DEFINE_FP_MM(mm, 7, st7),
 
     // XMM registers
     DEFINE_XMM(xmm, 0), DEFINE_XMM(xmm, 1), DEFINE_XMM(xmm, 2),