Index: llvm/lib/Target/AVR/AVRFrameLowering.cpp
===================================================================
--- llvm/lib/Target/AVR/AVRFrameLowering.cpp
+++ llvm/lib/Target/AVR/AVRFrameLowering.cpp
@@ -79,9 +79,9 @@
         .addReg(AVR::R0, RegState::Kill)
         .setMIFlag(MachineInstr::FrameSetup);
     BuildMI(MBB, MBBI, DL, TII.get(AVR::EORRdRr))
-        .addReg(AVR::R0, RegState::Define)
-        .addReg(AVR::R0, RegState::Kill)
-        .addReg(AVR::R0, RegState::Kill)
+        .addReg(AVR::R1, RegState::Define)
+        .addReg(AVR::R1, RegState::Kill)
+        .addReg(AVR::R1, RegState::Kill)
         .setMIFlag(MachineInstr::FrameSetup);
   }
 
Index: llvm/test/CodeGen/AVR/interrupts.ll
===================================================================
--- llvm/test/CodeGen/AVR/interrupts.ll
+++ llvm/test/CodeGen/AVR/interrupts.ll
@@ -7,7 +7,7 @@
 ; CHECK-NEXT: push r1
 ; CHECK-NEXT: in r0, 63
 ; CHECK-NEXT: push r0
-; CHECK: clr r0
+; CHECK: clr r1
 ; CHECK: pop r0
 ; CHECK-NEXT: out 63, r0
 ; CHECK-NEXT: pop r1
@@ -23,7 +23,7 @@
 ; CHECK-NEXT: push r1
 ; CHECK-NEXT: in r0, 63
 ; CHECK-NEXT: push r0
-; CHECK: clr r0
+; CHECK: clr r1
 ; CHECK: pop r0
 ; CHECK-NEXT: out 63, r0
 ; CHECK-NEXT: pop r1
@@ -39,7 +39,7 @@
 ; CHECK-NEXT: push r1
 ; CHECK-NEXT: in r0, 63
 ; CHECK-NEXT: push r0
-; CHECK: clr r0
+; CHECK: clr r1
 ; CHECK: pop r0
 ; CHECK-NEXT: out 63, r0
 ; CHECK-NEXT: pop r1
@@ -55,7 +55,7 @@
 ; CHECK-NEXT: push r1
 ; CHECK-NEXT: in r0, 63
 ; CHECK-NEXT: push r0
-; CHECK: clr r0
+; CHECK: clr r1
 ; CHECK: pop r0
 ; CHECK-NEXT: out 63, r0
 ; CHECK-NEXT: pop r1
@@ -71,7 +71,7 @@
 ; CHECK-NEXT: push r1
 ; CHECK-NEXT: in r0, 63
 ; CHECK-NEXT: push r0
-; CHECK: clr r0
+; CHECK: clr r1
 ; CHECK: push r28
 ; CHECK-NEXT: push r29
 ; CHECK-NEXT: in r28, 61