Index: lib/Target/X86/X86InstrSystem.td
===================================================================
--- lib/Target/X86/X86InstrSystem.td
+++ lib/Target/X86/X86InstrSystem.td
@@ -32,10 +32,19 @@
 def RSM : I<0xAA, RawFrm, (outs), (ins), "rsm", [], IIC_RSM>, TB;
 
 // Interrupt and SysCall Instructions.
-let Uses = [EFLAGS] in
+let Uses = [ESP, EFLAGS], Defs = [ESP, EFLAGS] in {
   def INTO : I<0xce, RawFrm, (outs), (ins), "into", []>;
-def INT3 : I<0xcc, RawFrm, (outs), (ins), "int3",
-              [(int_x86_int (i8 3))], IIC_INT3>;
+
+  def INT1 : I<0xf1, RawFrm, (outs), (ins), "int1",
+             [(int_x86_int (i8 1))], IIC_INT>;
+
+  def INT3 : I<0xcc, RawFrm, (outs), (ins), "int3",
+             [(int_x86_int (i8 3))], IIC_INT3>;
+
+  def INT  : Ii8<0xcd, RawFrm, (outs), (ins u8imm:$trap), "int\t$trap",
+             [(int_x86_int imm:$trap)], IIC_INT>;
+
+}
 } // SchedRW
 
 // The long form of "int $3" turns into int3 as a size optimization.
@@ -44,10 +53,6 @@
 
 let SchedRW = [WriteSystem] in {
 
-def INT : Ii8<0xcd, RawFrm, (outs), (ins u8imm:$trap), "int\t$trap",
-              [(int_x86_int imm:$trap)], IIC_INT>;
-
-
 def SYSCALL  : I<0x05, RawFrm, (outs), (ins), "syscall", [], IIC_SYSCALL>, TB;
 def SYSRET   : I<0x07, RawFrm, (outs), (ins), "sysret{l}", [], IIC_SYSCALL>, TB;
 def SYSRET64 :RI<0x07, RawFrm, (outs), (ins), "sysret{q}", [], IIC_SYSCALL>, TB,
Index: test/CodeGen/X86/int-intrinsic.ll
===================================================================
--- test/CodeGen/X86/int-intrinsic.ll
+++ test/CodeGen/X86/int-intrinsic.ll
@@ -3,6 +3,14 @@
 
 declare void @llvm.x86.int(i8) nounwind
 
+; CHECK: int1
+; CHECK: ret
+define void @primitive_int1 () {
+bb.entry:
+  call void @llvm.x86.int(i8 1) nounwind
+  ret void
+}
+
 ; CHECK: int3
 ; CHECK: ret
 define void @primitive_int3 () {
Index: test/MC/Disassembler/X86/simple-tests.txt
===================================================================
--- test/MC/Disassembler/X86/simple-tests.txt
+++ test/MC/Disassembler/X86/simple-tests.txt
@@ -6,6 +6,12 @@
 # CHECK: int	$33
 0xCD 0x21
 
+# CHECK: int1
+0xf1
+
+# CHECK: int3
+0xcc
+
 # CHECK: jrcxz -127
 0xe3 0x81
 
Index: test/MC/Disassembler/X86/x86-16.txt
===================================================================
--- test/MC/Disassembler/X86/x86-16.txt
+++ test/MC/Disassembler/X86/x86-16.txt
@@ -60,6 +60,9 @@
 # CHECK: into
 0xce
 
+# CHECK: int1
+0xf1
+
 # CHECK: int3
 0xcc
 
Index: test/MC/Disassembler/X86/x86-32.txt
===================================================================
--- test/MC/Disassembler/X86/x86-32.txt
+++ test/MC/Disassembler/X86/x86-32.txt
@@ -40,6 +40,11 @@
 # CHECK: crc32l %eax, %eax
 0xf2 0x0f 0x38 0xf1 0xc0
 
+# CHECK: int1
+0xf1
+
+# CHECK: int3
+0xcc
 
 # CHECK: int	$33
 0xCD 0x21 
Index: test/MC/X86/x86-16.s
===================================================================
--- test/MC/X86/x86-16.s
+++ test/MC/X86/x86-16.s
@@ -61,6 +61,9 @@
 into
 // CHECK: into
 // CHECK:  encoding: [0xce]
+int1
+// CHECK: int1
+// CHECK:  encoding: [0xf1]
 int3
 // CHECK: int3
 // CHECK:  encoding: [0xcc]
Index: test/MC/X86/x86-64.s
===================================================================
--- test/MC/X86/x86-64.s
+++ test/MC/X86/x86-64.s
@@ -197,6 +197,10 @@
 // CHECK: int3
 int	$3
 
+// CHECK: int1
+// CHECK:  encoding: [0xf1]
+int1
+
 
 // Allow scale factor without index register.
 // CHECK: movaps	%xmm3, (%esi)