; LLVM IR from smv1999/CompetitiveProgrammingQuestionBank :: CodeVita Problems (string_pair)

; 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: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind uwtable
define dso_local i32 @countPairs(ptr noundef %0, i32 noundef %1, i32 noundef %2) #1 {
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %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 %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  store i32 %2, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  store i32 0, 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 %5, 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
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  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 = %42, %16
  %20 = load i32, ptr %10, align 4, !tbaa !9
  %21 = load i32, ptr %5, 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
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  br label %45

24:                                               ; preds = %19
  %25 = load ptr, ptr %4, 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 %4, 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 %6, align 4, !tbaa !9
  %37 = icmp eq i32 %35, %36
  br i1 %37, label %38, label %41

38:                                               ; preds = %24
  %39 = load i32, ptr %7, align 4, !tbaa !9
  %40 = add nsw i32 %39, 1
  store i32 %40, ptr %7, align 4, !tbaa !9
  br label %41

41:                                               ; preds = %38, %24
  br label %42

42:                                               ; preds = %41
  %43 = load i32, ptr %10, align 4, !tbaa !9
  %44 = add nsw i32 %43, 1
  store i32 %44, ptr %10, align 4, !tbaa !9
  br label %19, !llvm.loop !11

45:                                               ; preds = %23
  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 = %15
  %50 = load i32, ptr %7, align 4, !tbaa !9
  store i32 1, ptr %9, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  ret i32 %50
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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/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: nofree norecurse nosync nounwind memory(argmem: read) uwtable
define dso_local i32 @countPairs(ptr nocapture noundef readonly %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = icmp sgt i32 %1, 0
  br i1 %4, label %.lr.ph20.preheader, label %._crit_edge

.lr.ph20.preheader:                               ; preds = %3
  %5 = zext nneg i32 %1 to i64
  %wide.trip.count28 = zext nneg i32 %1 to i64
  %broadcast.splatinsert32 = insertelement <4 x i32> poison, i32 %2, i64 0
  %broadcast.splat33 = shufflevector <4 x i32> %broadcast.splatinsert32, <4 x i32> poison, <4 x i32> zeroinitializer
  br label %.lr.ph20

.loopexit:                                        ; preds = %scalar.ph, %middle.block, %.lr.ph20
  %.1.lcssa = phi i32 [ %.01418, %.lr.ph20 ], [ %24, %middle.block ], [ %spec.select, %scalar.ph ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond29.not = icmp eq i64 %indvars.iv.next26, %wide.trip.count28
  br i1 %exitcond29.not, label %._crit_edge, label %.lr.ph20, !llvm.loop !5

._crit_edge:                                      ; preds = %.loopexit, %3
  %.014.lcssa = phi i32 [ 0, %3 ], [ %.1.lcssa, %.loopexit ]
  ret i32 %.014.lcssa

.lr.ph20:                                         ; preds = %.lr.ph20.preheader, %.loopexit
  %indvars.iv25 = phi i64 [ 0, %.lr.ph20.preheader ], [ %indvars.iv.next26, %.loopexit ]
  %indvars.iv = phi i64 [ 1, %.lr.ph20.preheader ], [ %indvars.iv.next, %.loopexit ]
  %.01418 = phi i32 [ 0, %.lr.ph20.preheader ], [ %.1.lcssa, %.loopexit ]
  %6 = xor i64 %indvars.iv25, -1
  %7 = add nsw i64 %6, %wide.trip.count28
  %indvars.iv.next26 = add nuw nsw i64 %indvars.iv25, 1
  %8 = icmp ult i64 %indvars.iv.next26, %5
  br i1 %8, label %.lr.ph, label %.loopexit

.lr.ph:                                           ; preds = %.lr.ph20
  %9 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv25
  %10 = load i32, ptr %9, align 4, !tbaa !7
  %min.iters.check = icmp ult i64 %7, 8
  br i1 %min.iters.check, label %scalar.ph.preheader, label %vector.ph

vector.ph:                                        ; preds = %.lr.ph
  %n.vec = and i64 %7, -8
  %ind.end = add i64 %indvars.iv, %n.vec
  %11 = insertelement <4 x i32> <i32 poison, i32 0, i32 0, i32 0>, i32 %.01418, i64 0
  %broadcast.splatinsert = insertelement <4 x i32> poison, i32 %10, i64 0
  %broadcast.splat = shufflevector <4 x i32> %broadcast.splatinsert, <4 x i32> poison, <4 x i32> zeroinitializer
  %12 = getelementptr i32, ptr %0, i64 %indvars.iv
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %vec.phi = phi <4 x i32> [ %11, %vector.ph ], [ %21, %vector.body ]
  %vec.phi30 = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %22, %vector.body ]
  %13 = getelementptr i32, ptr %12, i64 %index
  %14 = getelementptr inbounds i8, ptr %13, i64 16
  %wide.load = load <4 x i32>, ptr %13, align 4, !tbaa !7
  %wide.load31 = load <4 x i32>, ptr %14, align 4, !tbaa !7
  %15 = add nsw <4 x i32> %wide.load, %broadcast.splat
  %16 = add nsw <4 x i32> %wide.load31, %broadcast.splat
  %17 = icmp eq <4 x i32> %15, %broadcast.splat33
  %18 = icmp eq <4 x i32> %16, %broadcast.splat33
  %19 = zext <4 x i1> %17 to <4 x i32>
  %20 = zext <4 x i1> %18 to <4 x i32>
  %21 = add <4 x i32> %vec.phi, %19
  %22 = add <4 x i32> %vec.phi30, %20
  %index.next = add nuw i64 %index, 8
  %23 = icmp eq i64 %index.next, %n.vec
  br i1 %23, label %middle.block, label %vector.body, !llvm.loop !11

middle.block:                                     ; preds = %vector.body
  %bin.rdx = add <4 x i32> %22, %21
  %24 = tail call i32 @llvm.vector.reduce.add.v4i32(<4 x i32> %bin.rdx)
  %cmp.n = icmp eq i64 %7, %n.vec
  br i1 %cmp.n, label %.loopexit, label %scalar.ph.preheader

scalar.ph.preheader:                              ; preds = %middle.block, %.lr.ph
  %indvars.iv22.ph = phi i64 [ %indvars.iv, %.lr.ph ], [ %ind.end, %middle.block ]
  %.116.ph = phi i32 [ %.01418, %.lr.ph ], [ %24, %middle.block ]
  br label %scalar.ph

scalar.ph:                                        ; preds = %scalar.ph.preheader, %scalar.ph
  %indvars.iv22 = phi i64 [ %indvars.iv.next23, %scalar.ph ], [ %indvars.iv22.ph, %scalar.ph.preheader ]
  %.116 = phi i32 [ %spec.select, %scalar.ph ], [ %.116.ph, %scalar.ph.preheader ]
  %25 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv22
  %26 = load i32, ptr %25, align 4, !tbaa !7
  %27 = add nsw i32 %26, %10
  %28 = icmp eq i32 %27, %2
  %29 = zext i1 %28 to i32
  %spec.select = add nsw i32 %.116, %29
  %indvars.iv.next23 = add nuw nsw i64 %indvars.iv22, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next23, %wide.trip.count28
  br i1 %exitcond.not, label %.loopexit, label %scalar.ph, !llvm.loop !14
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.vector.reduce.add.v4i32(<4 x i32>) #1

attributes #0 = { nofree norecurse nosync nounwind 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" }
attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }

!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"}
!7 = !{!8, !8, i64 0}
!8 = !{!"int", !9, i64 0}
!9 = !{!"omnipotent char", !10, i64 0}
!10 = !{!"Simple C/C++ TBAA"}
!11 = distinct !{!11, !6, !12, !13}
!12 = !{!"llvm.loop.isvectorized", i32 1}
!13 = !{!"llvm.loop.unroll.runtime.disable"}
!14 = distinct !{!14, !6, !13, !12}


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