define zeroext i1 @test0(i64 %x) nounwind {
; CHECK-LABEL: test0:
-; CHECK-NEXT: incq %rdi
-; CHECK-NEXT: cmpq $1, %rdi
+; CHECK-NEXT: incq %[[X:rdi|rcx]]
+; CHECK-NEXT: cmpq $1, %[[X]]
; CHECK-NEXT: seta %al
; CHECK-NEXT: ret
%cmp1 = icmp ne i64 %x, -1