; LLVM IR from ERGO-Code/HiGHS :: src/mip/HighsSearch.ll (ZN11HighsSearch15solveDepthFirstEl)

; 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: mustprogress uwtable
declare dso_local noundef zeroext i1 @_ZN11HighsSearch9backtrackEb(ptr noundef nonnull align 8 dereferenceable(1064), i1 noundef zeroext) #1 align 2

; Function Attrs: mustprogress uwtable
declare dso_local noundef i32 @_ZN11HighsSearch4diveEv(ptr noundef nonnull align 8 dereferenceable(1064)) #1 align 2

; Function Attrs: mustprogress uwtable
define dso_local void @_ZN11HighsSearch15solveDepthFirstEl(ptr noundef nonnull align 8 dereferenceable(1064) %0, i64 noundef %1) #1 align 2 {
  %3 = alloca ptr, align 8
  %4 = alloca i64, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i64 %1, ptr %4, align 8, !tbaa !9
  %7 = load ptr, ptr %3, align 8
  br label %8

8:                                                ; preds = %23, %2
  %9 = load i64, ptr %4, align 8, !tbaa !9
  %10 = icmp eq i64 %9, 0
  br i1 %10, label %11, label %12

11:                                               ; preds = %8
  br label %25

12:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  %13 = call noundef i32 @_ZN11HighsSearch4diveEv(ptr noundef nonnull align 8 dereferenceable(1064) %7)
  store i32 %13, ptr %5, align 4, !tbaa !11
  %14 = load i32, ptr %5, align 4, !tbaa !11
  %15 = icmp eq i32 %14, 5
  br i1 %15, label %16, label %17

16:                                               ; preds = %12
  store i32 2, ptr %6, align 4
  br label %20

17:                                               ; preds = %12
  %18 = load i64, ptr %4, align 8, !tbaa !9
  %19 = add nsw i64 %18, -1
  store i64 %19, ptr %4, align 8, !tbaa !9
  store i32 0, ptr %6, align 4
  br label %20

20:                                               ; preds = %17, %16
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  %21 = load i32, ptr %6, align 4
  switch i32 %21, label %26 [
    i32 0, label %22
    i32 2, label %25
  ]

22:                                               ; preds = %20
  br label %23

23:                                               ; preds = %22
  %24 = call noundef zeroext i1 @_ZN11HighsSearch9backtrackEb(ptr noundef nonnull align 8 dereferenceable(1064) %7, i1 noundef zeroext true)
  br i1 %24, label %8, label %25, !llvm.loop !13

25:                                               ; preds = %23, %20, %11
  ret void

26:                                               ; preds = %20
  unreachable
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress 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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"_ZTSN11HighsSearch10NodeResultE", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"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 uwtable
declare dso_local noundef zeroext i1 @_ZN11HighsSearch9backtrackEb(ptr noundef nonnull align 8 dereferenceable(1064), i1 noundef zeroext) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress uwtable
declare dso_local noundef i32 @_ZN11HighsSearch4diveEv(ptr noundef nonnull align 8 dereferenceable(1064)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress uwtable
define dso_local void @_ZN11HighsSearch15solveDepthFirstEl(ptr noundef nonnull align 8 dereferenceable(1064) %0, i64 noundef %1) local_unnamed_addr #0 align 2 {
  %.old1 = icmp eq i64 %1, 0
  br i1 %.old1, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %2, %5
  %.06 = phi i64 [ %6, %5 ], [ %1, %2 ]
  %3 = tail call noundef i32 @_ZN11HighsSearch4diveEv(ptr noundef nonnull align 8 dereferenceable(1064) %0)
  %4 = icmp eq i32 %3, 5
  br i1 %4, label %.loopexit, label %5

5:                                                ; preds = %.preheader
  %6 = add nsw i64 %.06, -1
  %7 = tail call noundef zeroext i1 @_ZN11HighsSearch9backtrackEb(ptr noundef nonnull align 8 dereferenceable(1064) %0, i1 noundef zeroext true)
  %8 = icmp ne i64 %6, 0
  %or.cond.not = select i1 %7, i1 %8, i1 false
  br i1 %or.cond.not, label %.preheader, label %.loopexit, !llvm.loop !5

.loopexit:                                        ; preds = %.preheader, %5, %2
  ret void
}

attributes #0 = { mustprogress 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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass