diff --git a/lib/Target/X86/X86InstrSystem.td b/lib/Target/X86/X86InstrSystem.td
index bbc9bdb319d..c2b593ac70b 100644
--- a/lib/Target/X86/X86InstrSystem.td
+++ b/lib/Target/X86/X86InstrSystem.td
@@ -577,3 +577,9 @@ let Defs = [EFLAGS] in {
   def CLAC : I<0x01, MRM_CA, (outs), (ins), "clac", []>, TB;
   def STAC : I<0x01, MRM_CB, (outs), (ins), "stac", []>, TB;
 }
+
+//===----------------------------------------------------------------------===//
+// SMX Instruction
+let Uses = [RAX, RBX, RCX, RDX], Defs = [RAX, RBX, RCX] in {
+  def GETSEC : I<0x37, RawFrm, (outs), (ins), "getsec", []>, TB;
+}
diff --git a/test/MC/Disassembler/X86/x86-32.txt b/test/MC/Disassembler/X86/x86-32.txt
index 01ae7114dcb..830b8306630 100644
--- a/test/MC/Disassembler/X86/x86-32.txt
+++ b/test/MC/Disassembler/X86/x86-32.txt
@@ -761,3 +761,6 @@
 0x82 0x35 0x38 0x87 0x50 0x00 0x26
 # CHECK: cmpb $38, 5277496
 0x82 0x3d 0x38 0x87 0x50 0x00 0x26
+
+#CHECK: getsec
+0x0f 0x37
diff --git a/test/MC/X86/x86-32-coverage.s b/test/MC/X86/x86-32-coverage.s
index 4f9066ce54e..e14031d67f1 100644
--- a/test/MC/X86/x86-32-coverage.s
+++ b/test/MC/X86/x86-32-coverage.s
@@ -10738,3 +10738,7 @@ btcq $4, (%eax)
 // CHECK: xrstors	305419896
 // CHECK:  encoding: [0x0f,0xc7,0x1d,0x78,0x56,0x34,0x12]
         	xrstors	0x12345678
+
+// CHECK: getsec
+// CHECK:  encoding: [0x0f,0x37]
+        	getsec