; LLVM IR from smwikipedia/EmbeddedAndRTOSSamples :: C3.3 (t)

; Unoptimized IR (clang -disable-llvm-passes):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

%struct.uart = type { ptr, i32, [128 x i8], i32, i32, i32, i32, [128 x i8], i32, i32, i32, i32, i32 }

@uart = external global [4 x %struct.uart], align 16
@.str = external hidden unnamed_addr constant [26 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [41 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local void @main() #0 {
  %1 = alloca [128 x i8], align 16
  %2 = alloca ptr, align 8
  call void @llvm.lifetime.start.p0(i64 128, ptr %1) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %2) #3
  %3 = load i32, ptr inttoptr (i64 269746192 to ptr), align 4, !tbaa !5
  %4 = or i32 %3, 4096
  store i32 %4, ptr inttoptr (i64 269746192 to ptr), align 4, !tbaa !5
  %5 = load i32, ptr inttoptr (i64 269746192 to ptr), align 4, !tbaa !5
  %6 = or i32 %5, 8192
  store i32 %6, ptr inttoptr (i64 269746192 to ptr), align 4, !tbaa !5
  call void (...) @uart_init()
  store ptr @uart, ptr %2, align 8, !tbaa !9
  br label %7

7:                                                ; preds = %8, %0
  br label %8

8:                                                ; preds = %7
  %9 = load ptr, ptr %2, align 8, !tbaa !9
  call void @uprints(ptr noundef %9, ptr noundef @.str)
  %10 = load ptr, ptr %2, align 8, !tbaa !9
  %11 = getelementptr inbounds [128 x i8], ptr %1, i64 0, i64 0
  call void @ugets(ptr noundef %10, ptr noundef %11)
  %12 = load ptr, ptr %2, align 8, !tbaa !9
  call void @uprints(ptr noundef %12, ptr noundef @.str.1)
  %13 = load ptr, ptr %2, align 8, !tbaa !9
  %14 = getelementptr inbounds [128 x i8], ptr %1, i64 0, i64 0
  call void @uprints(ptr noundef %13, ptr noundef %14)
  br label %7
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

declare void @uart_init(...) #2

declare void @uprints(ptr noundef, ptr noundef) #2

declare void @ugets(ptr noundef, ptr noundef) #2

attributes #0 = { nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #3 = { nounwind }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}


; Optimized IR (opt -passes='default<O3>'):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

%struct.uart = type { ptr, i32, [128 x i8], i32, i32, i32, i32, [128 x i8], i32, i32, i32, i32, i32 }

@uart = external global [4 x %struct.uart], align 16
@.str = external hidden unnamed_addr constant [26 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [41 x i8], align 1

; Function Attrs: noreturn nounwind uwtable
define dso_local void @main() local_unnamed_addr #0 {
  %1 = alloca [128 x i8], align 16
  call void @llvm.lifetime.start.p0(i64 128, ptr nonnull %1) #3
  %2 = load i32, ptr inttoptr (i64 269746192 to ptr), align 16, !tbaa !5
  %3 = or i32 %2, 12288
  store i32 %3, ptr inttoptr (i64 269746192 to ptr), align 16, !tbaa !5
  tail call void (...) @uart_init() #3
  br label %4

4:                                                ; preds = %4, %0
  call void @uprints(ptr noundef nonnull @uart, ptr noundef nonnull @.str) #3
  call void @ugets(ptr noundef nonnull @uart, ptr noundef nonnull %1) #3
  call void @uprints(ptr noundef nonnull @uart, ptr noundef nonnull @.str.1) #3
  call void @uprints(ptr noundef nonnull @uart, ptr noundef nonnull %1) #3
  br label %4
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

declare void @uart_init(...) local_unnamed_addr #2

declare void @uprints(ptr noundef, ptr noundef) local_unnamed_addr #2

declare void @ugets(ptr noundef, ptr noundef) local_unnamed_addr #2

attributes #0 = { noreturn nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #1 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #3 = { nounwind }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass