; LLVM IR from gargarchit/Data_Structure_n_Algorithms :: Array_Problems (3_Sum_Recursive)

; 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 i64 @Sum(i64 noundef %0) #0 {
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  store i64 %0, ptr %3, align 8, !tbaa !5
  %4 = load i64, ptr %3, align 8, !tbaa !5
  %5 = icmp sgt i64 %4, 0
  br i1 %5, label %6, label %12

6:                                                ; preds = %1
  %7 = load i64, ptr %3, align 8, !tbaa !5
  %8 = load i64, ptr %3, align 8, !tbaa !5
  %9 = sub nsw i64 %8, 1
  %10 = call i64 @Sum(i64 noundef %9)
  %11 = add nsw i64 %7, %10
  store i64 %11, ptr %2, align 8
  br label %14

12:                                               ; preds = %1
  %13 = load i64, ptr %3, align 8, !tbaa !5
  store i64 %13, ptr %2, align 8
  br label %14

14:                                               ; preds = %12, %6
  %15 = load i64, ptr %2, align 8
  ret i64 %15
}

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" }

!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 = !{!"long long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/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 nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local i64 @Sum(i64 noundef %0) local_unnamed_addr #0 {
  %2 = icmp sgt i64 %0, 0
  br i1 %2, label %tailrecurse.preheader, label %tailrecurse._crit_edge

tailrecurse.preheader:                            ; preds = %1
  %3 = add nsw i64 %0, -1
  %4 = mul i64 %3, %3
  %5 = zext nneg i64 %3 to i65
  %6 = add nsw i64 %0, -2
  %7 = zext i64 %6 to i65
  %8 = mul i65 %5, %7
  %9 = lshr i65 %8, 1
  %10 = trunc nuw i65 %9 to i64
  %11 = add i64 %4, %0
  %12 = sub i64 %11, %10
  br label %tailrecurse._crit_edge

tailrecurse._crit_edge:                           ; preds = %tailrecurse.preheader, %1
  %accumulator.ret.tr = phi i64 [ %0, %1 ], [ %12, %tailrecurse.preheader ]
  ret i64 %accumulator.ret.tr
}

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


; Effective O3 passes: CorrelatedValuePropagationPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InstCombinePass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,PostOrderFunctionAttrsPass,ReassociatePass,SCCPPass,SROAPass,SimplifyCFGPass,TailCallElimPass