; LLVM IR from amritansh22/Data-Structures-and-Algorithms-in-cpp :: find_span_of_an_array.ll (Z14calculate_spanPiiS_)

; 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 nounwind uwtable
define dso_local void @_Z14calculate_spanPiiS_(ptr noundef %0, i32 noundef %1, ptr noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  store ptr %2, ptr %6, align 8, !tbaa !5
  %9 = load ptr, ptr %6, align 8, !tbaa !5
  %10 = getelementptr inbounds i32, ptr %9, i64 0
  store i32 1, ptr %10, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  store i32 1, ptr %7, align 4, !tbaa !9
  br label %11

11:                                               ; preds = %53, %3
  %12 = load i32, ptr %7, align 4, !tbaa !9
  %13 = load i32, ptr %5, align 4, !tbaa !9
  %14 = icmp slt i32 %12, %13
  br i1 %14, label %15, label %56

15:                                               ; preds = %11
  store i32 1, ptr %8, align 4, !tbaa !9
  br label %16

16:                                               ; preds = %37, %15
  %17 = load i32, ptr %7, align 4, !tbaa !9
  %18 = load i32, ptr %8, align 4, !tbaa !9
  %19 = sub nsw i32 %17, %18
  %20 = icmp sge i32 %19, 0
  br i1 %20, label %21, label %35

21:                                               ; preds = %16
  %22 = load ptr, ptr %4, align 8, !tbaa !5
  %23 = load i32, ptr %7, align 4, !tbaa !9
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds i32, ptr %22, i64 %24
  %26 = load i32, ptr %25, align 4, !tbaa !9
  %27 = load ptr, ptr %4, align 8, !tbaa !5
  %28 = load i32, ptr %7, align 4, !tbaa !9
  %29 = load i32, ptr %8, align 4, !tbaa !9
  %30 = sub nsw i32 %28, %29
  %31 = sext i32 %30 to i64
  %32 = getelementptr inbounds i32, ptr %27, i64 %31
  %33 = load i32, ptr %32, align 4, !tbaa !9
  %34 = icmp sge i32 %26, %33
  br label %35

35:                                               ; preds = %21, %16
  %36 = phi i1 [ false, %16 ], [ %34, %21 ]
  br i1 %36, label %37, label %47

37:                                               ; preds = %35
  %38 = load ptr, ptr %6, align 8, !tbaa !5
  %39 = load i32, ptr %7, align 4, !tbaa !9
  %40 = load i32, ptr %8, align 4, !tbaa !9
  %41 = sub nsw i32 %39, %40
  %42 = sext i32 %41 to i64
  %43 = getelementptr inbounds i32, ptr %38, i64 %42
  %44 = load i32, ptr %43, align 4, !tbaa !9
  %45 = load i32, ptr %8, align 4, !tbaa !9
  %46 = add nsw i32 %45, %44
  store i32 %46, ptr %8, align 4, !tbaa !9
  br label %16, !llvm.loop !11

47:                                               ; preds = %35
  %48 = load i32, ptr %8, align 4, !tbaa !9
  %49 = load ptr, ptr %6, align 8, !tbaa !5
  %50 = load i32, ptr %7, align 4, !tbaa !9
  %51 = sext i32 %50 to i64
  %52 = getelementptr inbounds i32, ptr %49, i64 %51
  store i32 %48, ptr %52, align 4, !tbaa !9
  br label %53

53:                                               ; preds = %47
  %54 = load i32, ptr %7, align 4, !tbaa !9
  %55 = add nsw i32 %54, 1
  store i32 %55, ptr %7, align 4, !tbaa !9
  br label %11, !llvm.loop !13

56:                                               ; preds = %11
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  ret void
}

; 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

attributes #0 = { mustprogress 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 = { 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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}


; 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 nofree norecurse nosync nounwind memory(argmem: readwrite) uwtable
define dso_local void @_Z14calculate_spanPiiS_(ptr nocapture noundef readonly %0, i32 noundef %1, ptr nocapture noundef %2) local_unnamed_addr #0 {
  store i32 1, ptr %2, align 4, !tbaa !5
  %4 = icmp sgt i32 %1, 1
  br i1 %4, label %.preheader.preheader, label %._crit_edge

.preheader.preheader:                             ; preds = %3
  %wide.trip.count = zext nneg i32 %1 to i64
  br label %.lr.ph

.lr.ph:                                           ; preds = %.critedge, %.preheader.preheader
  %indvars.iv = phi i64 [ 1, %.preheader.preheader ], [ %indvars.iv.next, %.critedge ]
  %5 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv
  %6 = load i32, ptr %5, align 4, !tbaa !5
  %7 = trunc i64 %indvars.iv to i32
  %8 = add i32 %7, -1
  %9 = trunc nuw nsw i64 %indvars.iv to i32
  br label %10

10:                                               ; preds = %.lr.ph, %15
  %11 = phi i32 [ %8, %.lr.ph ], [ %19, %15 ]
  %.019 = phi i32 [ 1, %.lr.ph ], [ %18, %15 ]
  %12 = zext nneg i32 %11 to i64
  %13 = getelementptr inbounds i32, ptr %0, i64 %12
  %14 = load i32, ptr %13, align 4, !tbaa !5
  %.not = icmp slt i32 %6, %14
  br i1 %.not, label %.critedge, label %15

15:                                               ; preds = %10
  %16 = getelementptr inbounds i32, ptr %2, i64 %12
  %17 = load i32, ptr %16, align 4, !tbaa !5
  %18 = add nsw i32 %17, %.019
  %19 = sub nsw i32 %9, %18
  %20 = icmp sgt i32 %19, -1
  br i1 %20, label %10, label %.critedge, !llvm.loop !9

.critedge:                                        ; preds = %10, %15
  %.0.lcssa.ph = phi i32 [ %.019, %10 ], [ %18, %15 ]
  %21 = getelementptr inbounds i32, ptr %2, i64 %indvars.iv
  store i32 %.0.lcssa.ph, ptr %21, align 4, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !11

._crit_edge:                                      ; preds = %.critedge, %3
  ret void
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind memory(argmem: readwrite) 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)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SCCPPass,SROAPass,SimplifyCFGPass