diff --git a/llvm/lib/Target/AVR/AVRInstrInfo.td b/llvm/lib/Target/AVR/AVRInstrInfo.td
--- a/llvm/lib/Target/AVR/AVRInstrInfo.td
+++ b/llvm/lib/Target/AVR/AVRInstrInfo.td
@@ -555,7 +555,7 @@
 
     def MULSRdRr : FMUL2RdRr<0,
                              (outs),
-                             (ins GPR8:$lhs, GPR8:$rhs),
+                             (ins LD8:$lhs, LD8:$rhs),
                              "muls\t$lhs, $rhs",
                              []>,
                    Requires<[SupportsMultiplication]>;
@@ -563,28 +563,28 @@
 
   def MULSURdRr : FMUL2RdRr<1,
                             (outs),
-                            (ins GPR8:$lhs, GPR8:$rhs),
+                            (ins LD8lo:$lhs, LD8lo:$rhs),
                             "mulsu\t$lhs, $rhs",
                             []>,
                   Requires<[SupportsMultiplication]>;
 
   def FMUL : FFMULRdRr<0b01,
                        (outs),
-                       (ins GPR8:$lhs, GPR8:$rhs),
+                       (ins LD8lo:$lhs, LD8lo:$rhs),
                        "fmul\t$lhs, $rhs",
                        []>,
              Requires<[SupportsMultiplication]>;
 
   def FMULS : FFMULRdRr<0b10,
                         (outs),
-                        (ins GPR8:$lhs, GPR8:$rhs),
+                        (ins LD8lo:$lhs, LD8lo:$rhs),
                         "fmuls\t$lhs, $rhs",
                         []>,
               Requires<[SupportsMultiplication]>;
 
   def FMULSU : FFMULRdRr<0b11,
                          (outs),
-                         (ins GPR8:$lhs, GPR8:$rhs),
+                         (ins LD8lo:$lhs, LD8lo:$rhs),
                          "fmulsu\t$lhs, $rhs",
                          []>,
                Requires<[SupportsMultiplication]>;