; LLVM IR from devparthgarg/Data-Structures-and-Algorithms :: 06. Searching/10 Pair Sum/10a pair sum.ll (Z6twoSumPiii)

; 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 noundef zeroext i1 @_Z6twoSumPiii(ptr noundef %0, i32 noundef %1, i32 noundef %2) #0 {
  %4 = alloca i1, align 1
  %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
  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
  store i32 0, ptr %8, align 4, !tbaa !9
  br label %11

11:                                               ; preds = %46, %3
  %12 = load i32, ptr %8, align 4, !tbaa !9
  %13 = load i32, ptr %6, align 4, !tbaa !9
  %14 = icmp slt i32 %12, %13
  br i1 %14, label %16, label %15

15:                                               ; preds = %11
  store i32 2, ptr %9, align 4
  br label %49

16:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  %17 = load i32, ptr %8, align 4, !tbaa !9
  %18 = add nsw i32 %17, 1
  store i32 %18, ptr %10, align 4, !tbaa !9
  br label %19

19:                                               ; preds = %40, %16
  %20 = load i32, ptr %10, align 4, !tbaa !9
  %21 = load i32, ptr %6, align 4, !tbaa !9
  %22 = icmp slt i32 %20, %21
  br i1 %22, label %24, label %23

23:                                               ; preds = %19
  store i32 5, ptr %9, align 4
  br label %43

24:                                               ; preds = %19
  %25 = load ptr, ptr %5, align 8, !tbaa !5
  %26 = load i32, ptr %8, align 4, !tbaa !9
  %27 = sext i32 %26 to i64
  %28 = getelementptr inbounds i32, ptr %25, i64 %27
  %29 = load i32, ptr %28, align 4, !tbaa !9
  %30 = load ptr, ptr %5, align 8, !tbaa !5
  %31 = load i32, ptr %10, align 4, !tbaa !9
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds i32, ptr %30, i64 %32
  %34 = load i32, ptr %33, align 4, !tbaa !9
  %35 = add nsw i32 %29, %34
  %36 = load i32, ptr %7, align 4, !tbaa !9
  %37 = icmp eq i32 %35, %36
  br i1 %37, label %38, label %39

38:                                               ; preds = %24
  store i1 true, ptr %4, align 1
  store i32 1, ptr %9, align 4
  br label %43

39:                                               ; preds = %24
  br label %40

40:                                               ; preds = %39
  %41 = load i32, ptr %10, align 4, !tbaa !9
  %42 = add nsw i32 %41, 1
  store i32 %42, ptr %10, align 4, !tbaa !9
  br label %19, !llvm.loop !11

43:                                               ; preds = %38, %23
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  %44 = load i32, ptr %9, align 4
  switch i32 %44, label %49 [
    i32 5, label %45
  ]

45:                                               ; preds = %43
  br label %46

46:                                               ; preds = %45
  %47 = load i32, ptr %8, align 4, !tbaa !9
  %48 = add nsw i32 %47, 1
  store i32 %48, ptr %8, align 4, !tbaa !9
  br label %11, !llvm.loop !13

49:                                               ; preds = %43, %15
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  %50 = load i32, ptr %9, align 4
  switch i32 %50, label %54 [
    i32 2, label %51
    i32 1, label %52
  ]

51:                                               ; preds = %49
  store i1 false, ptr %4, align 1
  br label %52

52:                                               ; preds = %51, %49
  %53 = load i1, ptr %4, align 1
  ret i1 %53

54:                                               ; preds = %49
  unreachable
}

; 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 willreturn memory(argmem: read) uwtable
define dso_local noundef zeroext i1 @_Z6twoSumPiii(ptr nocapture noundef readonly %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %.not2026 = icmp sgt i32 %1, 0
  br i1 %.not2026, label %.lr.ph29.preheader, label %.thread

.lr.ph29.preheader:                               ; preds = %3
  %4 = zext nneg i32 %1 to i64
  %wide.trip.count37 = zext nneg i32 %1 to i64
  br label %.lr.ph29

.loopexit:                                        ; preds = %7, %.lr.ph29
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond38.not = icmp eq i64 %indvars.iv.next36, %wide.trip.count37
  br i1 %exitcond38.not, label %.thread, label %.lr.ph29

.lr.ph29:                                         ; preds = %.lr.ph29.preheader, %.loopexit
  %indvars.iv35 = phi i64 [ 0, %.lr.ph29.preheader ], [ %indvars.iv.next36, %.loopexit ]
  %indvars.iv = phi i64 [ 1, %.lr.ph29.preheader ], [ %indvars.iv.next, %.loopexit ]
  %.not2028 = phi i1 [ true, %.lr.ph29.preheader ], [ %.not24, %.loopexit ]
  %indvars.iv.next36 = add nuw nsw i64 %indvars.iv35, 1
  %.not24 = icmp ult i64 %indvars.iv.next36, %4
  br i1 %.not24, label %.lr.ph, label %.loopexit

.lr.ph:                                           ; preds = %.lr.ph29
  %5 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv35
  %6 = load i32, ptr %5, align 4, !tbaa !5
  br label %8

7:                                                ; preds = %8
  %indvars.iv.next33 = add nuw nsw i64 %indvars.iv32, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next33, %wide.trip.count37
  br i1 %exitcond.not, label %.loopexit, label %8, !llvm.loop !9

8:                                                ; preds = %.lr.ph, %7
  %indvars.iv32 = phi i64 [ %indvars.iv, %.lr.ph ], [ %indvars.iv.next33, %7 ]
  %9 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv32
  %10 = load i32, ptr %9, align 4, !tbaa !5
  %11 = add nsw i32 %10, %6
  %12 = icmp eq i32 %11, %2
  br i1 %12, label %.thread, label %7

.thread:                                          ; preds = %.loopexit, %8, %3
  %.not2023 = phi i1 [ false, %3 ], [ %.not2028, %8 ], [ %.not24, %.loopexit ]
  ret i1 %.not2023
}

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"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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