; LLVM IR from sbshah97/DS-Algo-Handbook :: labs/lab2/Merge_Sort/merge_sort.ll (Z9mergeSortii)

; 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"

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z5mergeiii(i32 noundef, i32 noundef, i32 noundef) #0

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

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

; Function Attrs: mustprogress uwtable
define dso_local void @_Z9mergeSortii(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  %7 = load i32, ptr %3, align 4, !tbaa !5
  %8 = load i32, ptr %4, align 4, !tbaa !5
  %9 = icmp slt i32 %7, %8
  br i1 %9, label %10, label %19

10:                                               ; preds = %2
  %11 = load i32, ptr %3, align 4, !tbaa !5
  %12 = load i32, ptr %5, align 4, !tbaa !5
  call void @_Z9mergeSortii(i32 noundef %11, i32 noundef %12)
  %13 = load i32, ptr %5, align 4, !tbaa !5
  %14 = add nsw i32 %13, 1
  %15 = load i32, ptr %4, align 4, !tbaa !5
  call void @_Z9mergeSortii(i32 noundef %14, i32 noundef %15)
  %16 = load i32, ptr %3, align 4, !tbaa !5
  %17 = load i32, ptr %5, align 4, !tbaa !5
  %18 = load i32, ptr %4, align 4, !tbaa !5
  call void @_Z5mergeiii(i32 noundef %16, i32 noundef %17, i32 noundef %18)
  br label %20

19:                                               ; preds = %2
  store i32 1, ptr %6, align 4
  br label %21

20:                                               ; preds = %10
  store i32 0, ptr %6, align 4
  br label %21

21:                                               ; preds = %20, %19
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  %22 = load i32, ptr %6, align 4
  switch i32 %22, label %24 [
    i32 0, label %23
    i32 1, label %23
  ]

23:                                               ; preds = %21, %21
  ret void

24:                                               ; preds = %21
  unreachable
}

attributes #0 = { mustprogress 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 = { 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++ TBAA"}


; 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"

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z5mergeiii(i32 noundef, i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
define dso_local void @_Z9mergeSortii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp slt i32 %0, %1
  br i1 %3, label %4, label %common.ret10

common.ret10:                                     ; preds = %2, %4
  ret void

4:                                                ; preds = %2
  tail call void @_Z9mergeSortii(i32 noundef %0, i32 noundef undef)
  tail call void @_Z9mergeSortii(i32 noundef undef, i32 noundef %1)
  tail call void @_Z5mergeiii(i32 noundef %0, i32 noundef undef, i32 noundef %1)
  br label %common.ret10
}

attributes #0 = { mustprogress 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" }

!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)"}


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