; LLVM IR from bartobri/data-structures-c :: arrays/recursive-divide-and-conquer (main)

; 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: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind uwtable
define dso_local i32 @max(ptr noundef %0, i32 noundef %1, i32 noundef %2) #1 {
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  %11 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store i32 %1, ptr %6, align 4, !tbaa !9
  store i32 %2, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  %12 = load i32, ptr %6, align 4, !tbaa !9
  %13 = load i32, ptr %7, align 4, !tbaa !9
  %14 = add nsw i32 %12, %13
  %15 = sdiv i32 %14, 2
  store i32 %15, ptr %10, align 4, !tbaa !9
  %16 = load i32, ptr %6, align 4, !tbaa !9
  %17 = load i32, ptr %7, align 4, !tbaa !9
  %18 = icmp eq i32 %16, %17
  br i1 %18, label %19, label %25

19:                                               ; preds = %3
  %20 = load ptr, ptr %5, align 8, !tbaa !5
  %21 = load i32, ptr %6, align 4, !tbaa !9
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds i32, ptr %20, i64 %22
  %24 = load i32, ptr %23, align 4, !tbaa !9
  store i32 %24, ptr %4, align 4
  store i32 1, ptr %11, align 4
  br label %42

25:                                               ; preds = %3
  %26 = load ptr, ptr %5, align 8, !tbaa !5
  %27 = load i32, ptr %6, align 4, !tbaa !9
  %28 = load i32, ptr %10, align 4, !tbaa !9
  %29 = call i32 @max(ptr noundef %26, i32 noundef %27, i32 noundef %28)
  store i32 %29, ptr %8, align 4, !tbaa !9
  %30 = load ptr, ptr %5, align 8, !tbaa !5
  %31 = load i32, ptr %10, align 4, !tbaa !9
  %32 = add nsw i32 %31, 1
  %33 = load i32, ptr %7, align 4, !tbaa !9
  %34 = call i32 @max(ptr noundef %30, i32 noundef %32, i32 noundef %33)
  store i32 %34, ptr %9, align 4, !tbaa !9
  %35 = load i32, ptr %8, align 4, !tbaa !9
  %36 = load i32, ptr %9, align 4, !tbaa !9
  %37 = icmp sgt i32 %35, %36
  br i1 %37, label %38, label %40

38:                                               ; preds = %25
  %39 = load i32, ptr %8, align 4, !tbaa !9
  store i32 %39, ptr %4, align 4
  store i32 1, ptr %11, align 4
  br label %42

40:                                               ; preds = %25
  %41 = load i32, ptr %9, align 4, !tbaa !9
  store i32 %41, ptr %4, align 4
  store i32 1, ptr %11, align 4
  br label %42

42:                                               ; preds = %40, %38, %19
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  %43 = load i32, ptr %4, align 4
  ret i32 %43
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !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"

; Function Attrs: nofree nosync nounwind memory(argmem: read) uwtable
define dso_local i32 @max(ptr nocapture noundef readonly %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = icmp eq i32 %1, %2
  br i1 %4, label %tailrecurse._crit_edge, label %tailrecurse

tailrecurse._crit_edge:                           ; preds = %tailrecurse, %3
  %accumulator.tr.lcssa = phi i32 [ -2147483648, %3 ], [ %., %tailrecurse ]
  %.tr20.lcssa = phi i32 [ %1, %3 ], [ %2, %tailrecurse ]
  %5 = sext i32 %.tr20.lcssa to i64
  %6 = getelementptr inbounds i32, ptr %0, i64 %5
  %7 = load i32, ptr %6, align 4, !tbaa !5
  %accumulator.ret.tr = tail call i32 @llvm.smax.i32(i32 %7, i32 %accumulator.tr.lcssa)
  ret i32 %accumulator.ret.tr

tailrecurse:                                      ; preds = %3, %tailrecurse
  %.tr2023 = phi i32 [ %11, %tailrecurse ], [ %1, %3 ]
  %accumulator.tr22 = phi i32 [ %., %tailrecurse ], [ -2147483648, %3 ]
  %8 = add nsw i32 %.tr2023, %2
  %9 = sdiv i32 %8, 2
  %10 = tail call i32 @max(ptr noundef %0, i32 noundef %.tr2023, i32 noundef %9)
  %11 = add nsw i32 %9, 1
  %. = tail call i32 @llvm.smax.i32(i32 %10, i32 %accumulator.tr22)
  %12 = icmp eq i32 %11, %2
  br i1 %12, label %tailrecurse._crit_edge, label %tailrecurse
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.smax.i32(i32, i32) #1

attributes #0 = { nofree nosync nounwind memory(argmem: read) 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 speculatable willreturn memory(none) }

!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: GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass