1 files changed, 26 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/X86InstrInfo.td b/llvm/lib/Target/X86/X86InstrInfo.td
index 2db827ea582..9bf0d6d3ffa 100644
--- a/llvm/lib/Target/X86/X86InstrInfo.td
+++ b/llvm/lib/Target/X86/X86InstrInfo.td
@@ -2402,6 +2402,32 @@ defm TZMSK   : tbm_binary_intr<0x01, "tzmsk", MRM4r, MRM4m>;
 } // HasTBM, EFLAGS
 
 //===----------------------------------------------------------------------===//
+// MONITORX/MWAITX Instructions
+//
+let SchedRW = [WriteSystem] in {
+let Uses = [EAX, ECX, EDX] in
+def MONITORXrrr : I<0x01, MRM_FA, (outs), (ins), "monitorx", [],
+                    IIC_SSE_MONITOR>, TB;
+let Uses = [ECX, EAX, EBX] in
+def MWAITXrr   : I<0x01, MRM_FB, (outs), (ins), "mwaitx", [], IIC_SSE_MWAIT>,
+                 TB;
+} // SchedRW
+
+def : InstAlias<"mwaitx\t{%eax, %ecx, %ebx|ebx, ecx, eax}", (MWAITXrr)>, Requires<[Not64BitMode]>;
+def : InstAlias<"mwaitx\t{%rax, %rcx, %rbx|rbx, rcx, rax}", (MWAITXrr)>, Requires<[In64BitMode]>;
+
+def : InstAlias<"monitorx\t{%eax, %ecx, %edx|edx, ecx, eax}", (MONITORXrrr)>,
+      Requires<[Not64BitMode]>;
+def : InstAlias<"monitorx\t{%rax, %rcx, %rdx|rdx, rcx, rax}", (MONITORXrrr)>,
+      Requires<[In64BitMode]>;
+
+//===----------------------------------------------------------------------===//
+// CLZERO Instruction
+//
+let Uses = [EAX] in
+def CLZEROr : I<0x01, MRM_FC, (outs), (ins), "clzero", []>, TB;
+
+//===----------------------------------------------------------------------===//
 // Pattern fragments to auto generate TBM instructions.
 //===----------------------------------------------------------------------===//