let SchedRW = [WriteSystem] in {
def WRMSR : I<0x30, RawFrm, (outs), (ins), "wrmsr", [], IIC_WRMSR>, TB;
def RDMSR : I<0x32, RawFrm, (outs), (ins), "rdmsr", [], IIC_RDMSR>, TB;
-def RDPMC : I<0x33, RawFrm, (outs), (ins), "rdpmc", [], IIC_RDPMC>, TB;
+
+let Defs = [RAX, RDX], Uses = [ECX] in
+ def RDPMC : I<0x33, RawFrm, (outs), (ins), "rdpmc", [(X86rdpmc)], IIC_RDPMC>,
+ TB;
def SMSW16r : I<0x01, MRM4r, (outs GR16:$dst), (ins),
"smsw{w}\t$dst", [], IIC_SMSW>, OpSize16, TB;