Create a test for issue llvm#163082.

Author: carlos4242

llvm/test/CodeGen/AVR/issue-163082.ll

@@ -0,0 +1,34 @@
+; RUN: llc < %s -mtriple=avr | FileCheck -v -dump-input always %s
+
+%Tstats = type <{ i8, i8 }>
+@ui1 = protected local_unnamed_addr global i64 zeroinitializer, align 8
+@ui2 = protected local_unnamed_addr global i64 zeroinitializer, align 8
+@failed = private unnamed_addr addrspace(1) constant [12 x i8] c"test failed\00"
+@stats = external protected global %Tstats, align 1
+
+; CHECK-LABEL: main:
+define protected noundef i32 @main(i32 %0, ptr nocapture readnone %1) local_unnamed_addr addrspace(1) #0 {
+entry:
+  store i64 94, ptr @ui1, align 8
+  store i64 53, ptr @ui2, align 8
+  tail call addrspace(1) void @reportFailureWithDetails(i16 ptrtoint (ptr addrspace(1) @failed to i16), i16 11, i8 2, i16 32, ptr nocapture nonnull swiftself dereferenceable(2) @stats)
+  %11 = load i64, ptr @ui1, align 8
+  %12 = load i64, ptr @ui2, align 8
+
+; COM: CHECK: call __udivdi3
+  %15 = udiv i64 %11, %12
+
+; look for the buggy pattern where r30/r31 are being clobbered, corrupting the stack pointer
+; CHECK-NOT: std  Z+{{[1-9]+}}, r30 
+; CHECK-NOT: std  Z+{{[1-9]+}}, r31
+
+; CHECK: call expect
+  tail call addrspace(1) void @expect(i64 %15, i64 1, i16 ptrtoint (ptr addrspace(1) @failed to i16), i16 11, i8 2, i16 33)
+
+; CHECK: ret
+  ret i32 0
+}
+
+declare protected void @expect(i64, i64, i16, i16, i8, i16) local_unnamed_addr addrspace(1) #0
+declare protected void @reportFailureWithDetails(i16, i16, i8, i16, ptr nocapture swiftself dereferenceable(2)) local_unnamed_addr addrspace(1) #0
+attributes #0 = { nounwind "frame-pointer"="all" "no-trapping-math"="true" "stack-protector-buffer-size"="8" }