; LLVM IR from codemistic/Data-Structures-and-Algorithms :: CPP/recursion/pivotArray.ll (Z10pivotIndexPiii)

; 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
define dso_local noundef i32 @_Z10pivotIndexPiii(ptr noundef %0, i32 noundef %1, i32 noundef %2) #0 {
  %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
  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
  %10 = load i32, ptr %6, align 4, !tbaa !9
  %11 = load i32, ptr %7, align 4, !tbaa !9
  %12 = icmp eq i32 %10, %11
  br i1 %12, label %13, label %15

13:                                               ; preds = %3
  %14 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %14, ptr %4, align 4
  br label %43

15:                                               ; preds = %3
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  %16 = load i32, ptr %6, align 4, !tbaa !9
  %17 = load i32, ptr %7, align 4, !tbaa !9
  %18 = load i32, ptr %6, align 4, !tbaa !9
  %19 = sub nsw i32 %17, %18
  %20 = sdiv i32 %19, 2
  %21 = add nsw i32 %16, %20
  store i32 %21, ptr %8, align 4, !tbaa !9
  %22 = load ptr, ptr %5, align 8, !tbaa !5
  %23 = load i32, ptr %8, 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 %5, align 8, !tbaa !5
  %28 = getelementptr inbounds i32, ptr %27, i64 0
  %29 = load i32, ptr %28, align 4, !tbaa !9
  %30 = icmp sge i32 %26, %29
  br i1 %30, label %31, label %37

31:                                               ; preds = %15
  %32 = load ptr, ptr %5, align 8, !tbaa !5
  %33 = load i32, ptr %8, align 4, !tbaa !9
  %34 = add nsw i32 %33, 1
  %35 = load i32, ptr %7, align 4, !tbaa !9
  %36 = call noundef i32 @_Z10pivotIndexPiii(ptr noundef %32, i32 noundef %34, i32 noundef %35)
  store i32 %36, ptr %4, align 4
  store i32 1, ptr %9, align 4
  br label %42

37:                                               ; preds = %15
  %38 = load ptr, ptr %5, align 8, !tbaa !5
  %39 = load i32, ptr %6, align 4, !tbaa !9
  %40 = load i32, ptr %8, align 4, !tbaa !9
  %41 = call noundef i32 @_Z10pivotIndexPiii(ptr noundef %38, i32 noundef %39, i32 noundef %40)
  store i32 %41, ptr %4, align 4
  store i32 1, ptr %9, align 4
  br label %42

42:                                               ; preds = %37, %31
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  br label %43

43:                                               ; preds = %42, %13
  %44 = load i32, ptr %4, align 4
  ret i32 %44
}

; 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 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}


; 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 willreturn memory(argmem: read) uwtable
define dso_local noundef i32 @_Z10pivotIndexPiii(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 %.lr.ph

.lr.ph:                                           ; preds = %3
  %5 = load i32, ptr %0, align 4, !tbaa !5
  br label %tailrecurse

tailrecurse:                                      ; preds = %.lr.ph, %tailrecurse
  %.tr1922 = phi i32 [ %2, %.lr.ph ], [ %spec.select20, %tailrecurse ]
  %.tr1821 = phi i32 [ %1, %.lr.ph ], [ %spec.select, %tailrecurse ]
  %6 = sub nsw i32 %.tr1922, %.tr1821
  %7 = sdiv i32 %6, 2
  %8 = add nsw i32 %7, %.tr1821
  %9 = sext i32 %8 to i64
  %10 = getelementptr inbounds i32, ptr %0, i64 %9
  %11 = load i32, ptr %10, align 4, !tbaa !5
  %.not = icmp slt i32 %11, %5
  %12 = add nsw i32 %8, 1
  %spec.select = select i1 %.not, i32 %.tr1821, i32 %12
  %spec.select20 = select i1 %.not, i32 %8, i32 %.tr1922
  %13 = icmp eq i32 %spec.select, %spec.select20
  br i1 %13, label %tailrecurse._crit_edge, label %tailrecurse

tailrecurse._crit_edge:                           ; preds = %tailrecurse, %3
  %.tr18.lcssa = phi i32 [ %1, %3 ], [ %spec.select, %tailrecurse ]
  ret i32 %.tr18.lcssa
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn 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" }

!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"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass