; LLVM IR from Dev-XYS/Algorithms :: Hungarian-Algorithm.ll (Z5matchv)

; 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"

@nl = external dso_local global i32, align 4
@vis = external dso_local global [1010 x i8], align 16

; Function Attrs: mustprogress uwtable
declare dso_local noundef zeroext i1 @_Z3dfsi(i32 noundef) #0

; 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

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z5matchv() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #3
  store i32 0, ptr %1, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #3
  store i32 1, ptr %2, align 4, !tbaa !5
  br label %3

3:                                                ; preds = %14, %0
  %4 = load i32, ptr %2, align 4, !tbaa !5
  %5 = load i32, ptr @nl, align 4, !tbaa !5
  %6 = icmp sle i32 %4, %5
  br i1 %6, label %8, label %7

7:                                                ; preds = %3
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #3
  br label %17

8:                                                ; preds = %3
  call void @llvm.memset.p0.i64(ptr align 16 @vis, i8 0, i64 1010, i1 false)
  %9 = load i32, ptr %2, align 4, !tbaa !5
  %10 = call noundef zeroext i1 @_Z3dfsi(i32 noundef %9)
  %11 = zext i1 %10 to i32
  %12 = load i32, ptr %1, align 4, !tbaa !5
  %13 = add nsw i32 %12, %11
  store i32 %13, ptr %1, align 4, !tbaa !5
  br label %14

14:                                               ; preds = %8
  %15 = load i32, ptr %2, align 4, !tbaa !5
  %16 = add nsw i32 %15, 1
  store i32 %16, ptr %2, align 4, !tbaa !5
  br label %3, !llvm.loop !9

17:                                               ; preds = %7
  %18 = load i32, ptr %1, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #3
  ret i32 %18
}

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #2

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" }
attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { nocallback nofree nounwind willreturn memory(argmem: write) }
attributes #3 = { 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++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"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"

@nl = external dso_local local_unnamed_addr global i32, align 4
@vis = external dso_local local_unnamed_addr global [1010 x i8], align 16

; Function Attrs: mustprogress uwtable
declare dso_local noundef zeroext i1 @_Z3dfsi(i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z5matchv() local_unnamed_addr #0 {
  %1 = load i32, ptr @nl, align 4, !tbaa !5
  %.not6 = icmp slt i32 %1, 1
  br i1 %.not6, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %.lr.ph, %0
  %.05.lcssa = phi i32 [ 0, %0 ], [ %4, %.lr.ph ]
  ret i32 %.05.lcssa

.lr.ph:                                           ; preds = %0, %.lr.ph
  %.08 = phi i32 [ %5, %.lr.ph ], [ 1, %0 ]
  %.057 = phi i32 [ %4, %.lr.ph ], [ 0, %0 ]
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 16 dereferenceable(1010) @vis, i8 0, i64 1010, i1 false)
  %2 = tail call noundef zeroext i1 @_Z3dfsi(i32 noundef %.08)
  %3 = zext i1 %2 to i32
  %4 = add nuw nsw i32 %.057, %3
  %5 = add nuw nsw i32 %.08, 1
  %6 = load i32, ptr @nl, align 4, !tbaa !5
  %.not.not = icmp slt i32 %.08, %6
  br i1 %.not.not, label %.lr.ph, label %._crit_edge, !llvm.loop !9
}

; Function Attrs: mustprogress nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #1

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" }
attributes #1 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: write) }

!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"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass