; LLVM IR from devparthgarg/Data-Structures-and-Algorithms :: 06. Searching/10 Pair Sum/10b 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
  %11 = 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
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  %12 = load i32, ptr %6, align 4, !tbaa !9
  %13 = sub nsw i32 %12, 1
  store i32 %13, ptr %9, align 4, !tbaa !9
  br label %14

14:                                               ; preds = %48, %3
  %15 = load i32, ptr %8, align 4, !tbaa !9
  %16 = load i32, ptr %9, align 4, !tbaa !9
  %17 = icmp slt i32 %15, %16
  br i1 %17, label %18, label %49

18:                                               ; preds = %14
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  %19 = load ptr, ptr %5, align 8, !tbaa !5
  %20 = load i32, ptr %8, align 4, !tbaa !9
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds i32, ptr %19, i64 %21
  %23 = load i32, ptr %22, align 4, !tbaa !9
  %24 = load ptr, ptr %5, align 8, !tbaa !5
  %25 = load i32, ptr %9, align 4, !tbaa !9
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds i32, ptr %24, i64 %26
  %28 = load i32, ptr %27, align 4, !tbaa !9
  %29 = add nsw i32 %23, %28
  store i32 %29, ptr %10, align 4, !tbaa !9
  %30 = load i32, ptr %10, align 4, !tbaa !9
  %31 = load i32, ptr %7, align 4, !tbaa !9
  %32 = icmp eq i32 %30, %31
  br i1 %32, label %33, label %34

33:                                               ; preds = %18
  store i1 true, ptr %4, align 1
  store i32 1, ptr %11, align 4
  br label %46

34:                                               ; preds = %18
  %35 = load i32, ptr %10, align 4, !tbaa !9
  %36 = load i32, ptr %7, align 4, !tbaa !9
  %37 = icmp sgt i32 %35, %36
  br i1 %37, label %38, label %41

38:                                               ; preds = %34
  %39 = load i32, ptr %9, align 4, !tbaa !9
  %40 = add nsw i32 %39, -1
  store i32 %40, ptr %9, align 4, !tbaa !9
  br label %44

41:                                               ; preds = %34
  %42 = load i32, ptr %8, align 4, !tbaa !9
  %43 = add nsw i32 %42, 1
  store i32 %43, ptr %8, align 4, !tbaa !9
  br label %44

44:                                               ; preds = %41, %38
  br label %45

45:                                               ; preds = %44
  store i32 0, ptr %11, align 4
  br label %46

46:                                               ; preds = %45, %33
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  %47 = load i32, ptr %11, align 4
  switch i32 %47, label %50 [
    i32 0, label %48
  ]

48:                                               ; preds = %46
  br label %14, !llvm.loop !11

49:                                               ; preds = %14
  store i1 false, ptr %4, align 1
  store i32 1, ptr %11, align 4
  br label %50

50:                                               ; preds = %49, %46
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  %51 = load i1, ptr %4, align 1
  ret i1 %51
}

; 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"}


; 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 {
  %4 = icmp sgt i32 %1, 1
  br i1 %4, label %.lr.ph.preheader, label %.thread

.lr.ph.preheader:                                 ; preds = %3
  %5 = add nsw i32 %1, -1
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %13
  %.01526 = phi i32 [ %.116, %13 ], [ %5, %.lr.ph.preheader ]
  %.01825 = phi i32 [ %.119, %13 ], [ 0, %.lr.ph.preheader ]
  %6 = zext nneg i32 %.01825 to i64
  %7 = getelementptr inbounds i32, ptr %0, i64 %6
  %8 = load i32, ptr %7, align 4, !tbaa !5
  %9 = sext i32 %.01526 to i64
  %10 = getelementptr inbounds i32, ptr %0, i64 %9
  %11 = load i32, ptr %10, align 4, !tbaa !5
  %12 = add nsw i32 %11, %8
  %.not = icmp eq i32 %12, %2
  br i1 %.not, label %.thread, label %13

13:                                               ; preds = %.lr.ph
  %14 = icmp sle i32 %12, %2
  %15 = zext i1 %14 to i32
  %.119 = add nuw nsw i32 %.01825, %15
  %not. = xor i1 %14, true
  %16 = sext i1 %not. to i32
  %.116 = add nsw i32 %.01526, %16
  %17 = icmp slt i32 %.119, %.116
  br i1 %17, label %.lr.ph, label %.thread

.thread:                                          ; preds = %13, %.lr.ph, %3
  %.lcssa = phi i1 [ false, %3 ], [ %.not, %.lr.ph ], [ %.not, %13 ]
  ret i1 %.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: CorrelatedValuePropagationPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass