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

; 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"

@ProblemType = external dso_local global i32, align 4
@Dimension = external dso_local global i32, align 4
@BetterTour = external dso_local global ptr, align 8
@BestTour = external dso_local global ptr, align 8

; Function Attrs: nounwind uwtable
define dso_local void @RecordBestTour() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #2
  %3 = load i32, ptr @ProblemType, align 4, !tbaa !5
  %4 = icmp ne i32 %3, 1
  br i1 %4, label %5, label %7

5:                                                ; preds = %0
  %6 = load i32, ptr @Dimension, align 4, !tbaa !5
  br label %10

7:                                                ; preds = %0
  %8 = load i32, ptr @Dimension, align 4, !tbaa !5
  %9 = sdiv i32 %8, 2
  br label %10

10:                                               ; preds = %7, %5
  %11 = phi i32 [ %6, %5 ], [ %9, %7 ]
  store i32 %11, ptr %2, align 4, !tbaa !5
  store i32 0, ptr %1, align 4, !tbaa !5
  br label %12

12:                                               ; preds = %26, %10
  %13 = load i32, ptr %1, align 4, !tbaa !5
  %14 = load i32, ptr %2, align 4, !tbaa !5
  %15 = icmp sle i32 %13, %14
  br i1 %15, label %16, label %29

16:                                               ; preds = %12
  %17 = load ptr, ptr @BetterTour, align 8, !tbaa !9
  %18 = load i32, ptr %1, align 4, !tbaa !5
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds i32, ptr %17, i64 %19
  %21 = load i32, ptr %20, align 4, !tbaa !5
  %22 = load ptr, ptr @BestTour, align 8, !tbaa !9
  %23 = load i32, ptr %1, align 4, !tbaa !5
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds i32, ptr %22, i64 %24
  store i32 %21, ptr %25, align 4, !tbaa !5
  br label %26

26:                                               ; preds = %16
  %27 = load i32, ptr %1, align 4, !tbaa !5
  %28 = add nsw i32 %27, 1
  store i32 %28, ptr %1, align 4, !tbaa !5
  br label %12, !llvm.loop !11

29:                                               ; preds = %12
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !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"

@ProblemType = external dso_local local_unnamed_addr global i32, align 4
@Dimension = external dso_local local_unnamed_addr global i32, align 4
@BetterTour = external dso_local local_unnamed_addr global ptr, align 8
@BestTour = external dso_local local_unnamed_addr global ptr, align 8

; Function Attrs: nofree norecurse nosync nounwind memory(readwrite, inaccessiblemem: none) uwtable
define dso_local void @RecordBestTour() local_unnamed_addr #0 {
  %1 = load i32, ptr @ProblemType, align 4, !tbaa !5
  %.not = icmp eq i32 %1, 1
  %2 = load i32, ptr @Dimension, align 4, !tbaa !5
  %3 = sdiv i32 %2, 2
  %4 = select i1 %.not, i32 %3, i32 %2
  %.not56 = icmp slt i32 %4, 0
  br i1 %.not56, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0
  %5 = load ptr, ptr @BetterTour, align 8, !tbaa !9
  %6 = load ptr, ptr @BestTour, align 8, !tbaa !9
  %7 = add nuw i32 %4, 1
  %wide.trip.count = zext i32 %7 to i64
  %min.iters.check = icmp ult i32 %4, 7
  %8 = ptrtoint ptr %6 to i64
  %9 = ptrtoint ptr %5 to i64
  %10 = sub i64 %8, %9
  %diff.check = icmp ult i64 %10, 32
  %or.cond = select i1 %min.iters.check, i1 true, i1 %diff.check
  br i1 %or.cond, label %scalar.ph.preheader, label %vector.ph

vector.ph:                                        ; preds = %.lr.ph
  %n.vec = and i64 %wide.trip.count, 4294967288
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %11 = getelementptr inbounds i32, ptr %5, i64 %index
  %12 = getelementptr inbounds i8, ptr %11, i64 16
  %wide.load = load <4 x i32>, ptr %11, align 4, !tbaa !5
  %wide.load9 = load <4 x i32>, ptr %12, align 4, !tbaa !5
  %13 = getelementptr inbounds i32, ptr %6, i64 %index
  %14 = getelementptr inbounds i8, ptr %13, i64 16
  store <4 x i32> %wide.load, ptr %13, align 4, !tbaa !5
  store <4 x i32> %wide.load9, ptr %14, align 4, !tbaa !5
  %index.next = add nuw i64 %index, 8
  %15 = icmp eq i64 %index.next, %n.vec
  br i1 %15, label %middle.block, label %vector.body, !llvm.loop !11

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.vec, %wide.trip.count
  br i1 %cmp.n, label %._crit_edge, label %scalar.ph.preheader

scalar.ph.preheader:                              ; preds = %middle.block, %.lr.ph
  %indvars.iv.ph = phi i64 [ 0, %.lr.ph ], [ %n.vec, %middle.block ]
  %16 = zext nneg i32 %4 to i64
  %17 = sub nsw i64 %16, %indvars.iv.ph
  %xtraiter = and i64 %wide.trip.count, 3
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %scalar.ph.prol.loopexit, label %scalar.ph.prol

scalar.ph.prol:                                   ; preds = %scalar.ph.preheader, %scalar.ph.prol
  %indvars.iv.prol = phi i64 [ %indvars.iv.next.prol, %scalar.ph.prol ], [ %indvars.iv.ph, %scalar.ph.preheader ]
  %prol.iter = phi i64 [ %prol.iter.next, %scalar.ph.prol ], [ 0, %scalar.ph.preheader ]
  %18 = getelementptr inbounds i32, ptr %5, i64 %indvars.iv.prol
  %19 = load i32, ptr %18, align 4, !tbaa !5
  %20 = getelementptr inbounds i32, ptr %6, i64 %indvars.iv.prol
  store i32 %19, ptr %20, align 4, !tbaa !5
  %indvars.iv.next.prol = add nuw nsw i64 %indvars.iv.prol, 1
  %prol.iter.next = add i64 %prol.iter, 1
  %prol.iter.cmp.not = icmp eq i64 %prol.iter.next, %xtraiter
  br i1 %prol.iter.cmp.not, label %scalar.ph.prol.loopexit, label %scalar.ph.prol, !llvm.loop !15

scalar.ph.prol.loopexit:                          ; preds = %scalar.ph.prol, %scalar.ph.preheader
  %indvars.iv.unr = phi i64 [ %indvars.iv.ph, %scalar.ph.preheader ], [ %indvars.iv.next.prol, %scalar.ph.prol ]
  %21 = icmp ult i64 %17, 3
  br i1 %21, label %._crit_edge, label %scalar.ph

scalar.ph:                                        ; preds = %scalar.ph.prol.loopexit, %scalar.ph
  %indvars.iv = phi i64 [ %indvars.iv.next.3, %scalar.ph ], [ %indvars.iv.unr, %scalar.ph.prol.loopexit ]
  %22 = getelementptr inbounds i32, ptr %5, i64 %indvars.iv
  %23 = load i32, ptr %22, align 4, !tbaa !5
  %24 = getelementptr inbounds i32, ptr %6, i64 %indvars.iv
  store i32 %23, ptr %24, align 4, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %25 = getelementptr inbounds i32, ptr %5, i64 %indvars.iv.next
  %26 = load i32, ptr %25, align 4, !tbaa !5
  %27 = getelementptr inbounds i32, ptr %6, i64 %indvars.iv.next
  store i32 %26, ptr %27, align 4, !tbaa !5
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %28 = getelementptr inbounds i32, ptr %5, i64 %indvars.iv.next.1
  %29 = load i32, ptr %28, align 4, !tbaa !5
  %30 = getelementptr inbounds i32, ptr %6, i64 %indvars.iv.next.1
  store i32 %29, ptr %30, align 4, !tbaa !5
  %indvars.iv.next.2 = add nuw nsw i64 %indvars.iv, 3
  %31 = getelementptr inbounds i32, ptr %5, i64 %indvars.iv.next.2
  %32 = load i32, ptr %31, align 4, !tbaa !5
  %33 = getelementptr inbounds i32, ptr %6, i64 %indvars.iv.next.2
  store i32 %32, ptr %33, align 4, !tbaa !5
  %indvars.iv.next.3 = add nuw nsw i64 %indvars.iv, 4
  %exitcond.not.3 = icmp eq i64 %indvars.iv.next.3, %wide.trip.count
  br i1 %exitcond.not.3, label %._crit_edge, label %scalar.ph, !llvm.loop !17

._crit_edge:                                      ; preds = %scalar.ph.prol.loopexit, %scalar.ph, %middle.block, %0
  ret void
}

attributes #0 = { nofree norecurse nosync nounwind memory(readwrite, inaccessiblemem: 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)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = distinct !{!11, !12, !13, !14}
!12 = !{!"llvm.loop.mustprogress"}
!13 = !{!"llvm.loop.isvectorized", i32 1}
!14 = !{!"llvm.loop.unroll.runtime.disable"}
!15 = distinct !{!15, !16}
!16 = !{!"llvm.loop.unroll.disable"}
!17 = distinct !{!17, !12, !13}


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