; LLVM IR from fcimeson/cbTSP :: cbLKH/SRC (Hashing)

; 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"

%struct.HashTable = type { [65521 x %struct.HashTableEntry], i32 }
%struct.HashTableEntry = type { i32, i64 }

; Function Attrs: nounwind uwtable
define dso_local void @HashInitialize(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  store i32 0, ptr %3, align 4, !tbaa !9
  br label %4

4:                                                ; preds = %20, %1
  %5 = load i32, ptr %3, align 4, !tbaa !9
  %6 = icmp slt i32 %5, 65521
  br i1 %6, label %7, label %23

7:                                                ; preds = %4
  %8 = load ptr, ptr %2, align 8, !tbaa !5
  %9 = getelementptr inbounds %struct.HashTable, ptr %8, i32 0, i32 0
  %10 = load i32, ptr %3, align 4, !tbaa !9
  %11 = sext i32 %10 to i64
  %12 = getelementptr inbounds [65521 x %struct.HashTableEntry], ptr %9, i64 0, i64 %11
  %13 = getelementptr inbounds %struct.HashTableEntry, ptr %12, i32 0, i32 0
  store i32 -1, ptr %13, align 8, !tbaa !11
  %14 = load ptr, ptr %2, align 8, !tbaa !5
  %15 = getelementptr inbounds %struct.HashTable, ptr %14, i32 0, i32 0
  %16 = load i32, ptr %3, align 4, !tbaa !9
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds [65521 x %struct.HashTableEntry], ptr %15, i64 0, i64 %17
  %19 = getelementptr inbounds %struct.HashTableEntry, ptr %18, i32 0, i32 1
  store i64 -9223372036854775808, ptr %19, align 8, !tbaa !14
  br label %20

20:                                               ; preds = %7
  %21 = load i32, ptr %3, align 4, !tbaa !9
  %22 = add nsw i32 %21, 1
  store i32 %22, ptr %3, align 4, !tbaa !9
  br label %4, !llvm.loop !15

23:                                               ; preds = %4
  %24 = load ptr, ptr %2, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.HashTable, ptr %24, i32 0, i32 1
  store i32 0, ptr %25, align 8, !tbaa !17
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret void
}

; 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 = { 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/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !10, i64 0}
!12 = !{!"HashTableEntry", !10, i64 0, !13, i64 8}
!13 = !{!"long long", !7, i64 0}
!14 = !{!12, !13, i64 8}
!15 = distinct !{!15, !16}
!16 = !{!"llvm.loop.mustprogress"}
!17 = !{!18, !10, i64 1048336}
!18 = !{!"HashTable", !7, i64 0, !10, i64 1048336}


; 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"

%struct.HashTableEntry = type { i32, i64 }

; Function Attrs: nofree norecurse nosync nounwind memory(argmem: write) uwtable
define dso_local void @HashInitialize(ptr nocapture noundef writeonly %0) local_unnamed_addr #0 {
  br label %2

2:                                                ; preds = %5, %1
  %indvars.iv = phi i64 [ 0, %1 ], [ %indvars.iv.next.3, %5 ]
  %3 = getelementptr inbounds [65521 x %struct.HashTableEntry], ptr %0, i64 0, i64 %indvars.iv
  store i32 -1, ptr %3, align 8, !tbaa !5
  %4 = getelementptr inbounds i8, ptr %3, i64 8
  store i64 -9223372036854775808, ptr %4, align 8, !tbaa !11
  %exitcond.not = icmp eq i64 %indvars.iv, 65520
  br i1 %exitcond.not, label %12, label %5, !llvm.loop !12

5:                                                ; preds = %2
  %indvars.iv.next = or disjoint i64 %indvars.iv, 1
  %6 = getelementptr inbounds [65521 x %struct.HashTableEntry], ptr %0, i64 0, i64 %indvars.iv.next
  store i32 -1, ptr %6, align 8, !tbaa !5
  %7 = getelementptr inbounds i8, ptr %6, i64 8
  store i64 -9223372036854775808, ptr %7, align 8, !tbaa !11
  %indvars.iv.next.1 = or disjoint i64 %indvars.iv, 2
  %8 = getelementptr inbounds [65521 x %struct.HashTableEntry], ptr %0, i64 0, i64 %indvars.iv.next.1
  store i32 -1, ptr %8, align 8, !tbaa !5
  %9 = getelementptr inbounds i8, ptr %8, i64 8
  store i64 -9223372036854775808, ptr %9, align 8, !tbaa !11
  %indvars.iv.next.2 = or disjoint i64 %indvars.iv, 3
  %10 = getelementptr inbounds [65521 x %struct.HashTableEntry], ptr %0, i64 0, i64 %indvars.iv.next.2
  store i32 -1, ptr %10, align 8, !tbaa !5
  %11 = getelementptr inbounds i8, ptr %10, i64 8
  store i64 -9223372036854775808, ptr %11, align 8, !tbaa !11
  %indvars.iv.next.3 = add nuw nsw i64 %indvars.iv, 4
  br label %2

12:                                               ; preds = %2
  %13 = getelementptr inbounds i8, ptr %0, i64 1048336
  store i32 0, ptr %13, align 8, !tbaa !14
  ret void
}

attributes #0 = { nofree norecurse nosync nounwind memory(argmem: write) 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, !7, i64 0}
!6 = !{!"HashTableEntry", !7, i64 0, !10, i64 8}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"long long", !8, i64 0}
!11 = !{!6, !10, i64 8}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = !{!15, !7, i64 1048336}
!15 = !{!"HashTable", !8, i64 0, !7, i64 1048336}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LoopRotatePass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass