; LLVM IR from kenjin/Awesome-LC-C-Cracker :: leetcode-c-sol/2485_find-the-pivot-integer (2485_find-the-pivot-integer)

; 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: nounwind uwtable
define dso_local i32 @pivotInteger(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 0, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  %8 = load i32, ptr %3, align 4, !tbaa !5
  %9 = add nsw i32 1, %8
  %10 = load i32, ptr %3, align 4, !tbaa !5
  %11 = mul nsw i32 %9, %10
  %12 = ashr i32 %11, 1
  store i32 %12, ptr %5, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 1, ptr %6, align 4, !tbaa !5
  br label %13

13:                                               ; preds = %31, %1
  %14 = load i32, ptr %6, align 4, !tbaa !5
  %15 = load i32, ptr %3, align 4, !tbaa !5
  %16 = icmp sle i32 %14, %15
  br i1 %16, label %18, label %17

17:                                               ; preds = %13
  store i32 2, ptr %7, align 4
  br label %34

18:                                               ; preds = %13
  %19 = load i32, ptr %6, align 4, !tbaa !5
  %20 = load i32, ptr %4, align 4, !tbaa !5
  %21 = add nsw i32 %20, %19
  store i32 %21, ptr %4, align 4, !tbaa !5
  %22 = load i32, ptr %4, align 4, !tbaa !5
  %23 = load i32, ptr %5, align 4, !tbaa !5
  %24 = icmp eq i32 %22, %23
  br i1 %24, label %25, label %27

25:                                               ; preds = %18
  %26 = load i32, ptr %6, align 4, !tbaa !5
  store i32 %26, ptr %2, align 4
  store i32 1, ptr %7, align 4
  br label %34

27:                                               ; preds = %18
  %28 = load i32, ptr %6, align 4, !tbaa !5
  %29 = load i32, ptr %5, align 4, !tbaa !5
  %30 = sub nsw i32 %29, %28
  store i32 %30, ptr %5, align 4, !tbaa !5
  br label %31

31:                                               ; preds = %27
  %32 = load i32, ptr %6, align 4, !tbaa !5
  %33 = add nsw i32 %32, 1
  store i32 %33, ptr %6, align 4, !tbaa !5
  br label %13, !llvm.loop !9

34:                                               ; preds = %25, %17
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  %35 = load i32, ptr %7, align 4
  switch i32 %35, label %37 [
    i32 2, label %36
  ]

36:                                               ; preds = %34
  store i32 -1, ptr %2, align 4
  store i32 1, ptr %7, align 4
  br label %37

37:                                               ; preds = %36, %34
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  %38 = load i32, ptr %2, align 4
  ret i32 %38
}

; 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 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; 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 norecurse nosync nounwind memory(none) uwtable
define dso_local i32 @pivotInteger(i32 noundef %0) local_unnamed_addr #0 {
  %.not19 = icmp slt i32 %0, 1
  br i1 %.not19, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %1
  %2 = add nuw i32 %0, 1
  %3 = mul nsw i32 %2, %0
  %4 = ashr i32 %3, 1
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %7
  %.01422 = phi i32 [ %9, %7 ], [ 1, %.lr.ph.preheader ]
  %.01521 = phi i32 [ %8, %7 ], [ %4, %.lr.ph.preheader ]
  %.01620 = phi i32 [ %5, %7 ], [ 0, %.lr.ph.preheader ]
  %5 = add nuw nsw i32 %.01422, %.01620
  %6 = icmp eq i32 %5, %.01521
  br i1 %6, label %._crit_edge, label %7

7:                                                ; preds = %.lr.ph
  %8 = sub nsw i32 %.01521, %.01422
  %9 = add nuw i32 %.01422, 1
  %exitcond.not = icmp eq i32 %.01422, %0
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !5

._crit_edge:                                      ; preds = %7, %.lr.ph, %1
  %spec.select = phi i32 [ -1, %1 ], [ %.01422, %.lr.ph ], [ -1, %7 ]
  ret i32 %spec.select
}

attributes #0 = { nofree norecurse nosync nounwind memory(none) 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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass