; LLVM IR from Dev-XYS/Algorithms :: Bigraph-Matching(Improved-Shortest-Augmenting-Path).ll (Z8max_flowv)

; 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.vertex = type { i32, i32 }

@V = external dso_local global [1010 x %struct.vertex], align 16
@nl = external dso_local global i32, align 4
@nr = external dso_local global i32, align 4
@src = external dso_local global i32, align 4

; Function Attrs: mustprogress uwtable
declare dso_local noundef i32 @_Z4isapii(i32 noundef, 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 @_Z8max_flowv() #0 {
  %1 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #2
  store i32 0, ptr %1, align 4, !tbaa !5
  br label %2

2:                                                ; preds = %13, %0
  %3 = load i32, ptr @src, align 4, !tbaa !5
  %4 = sext i32 %3 to i64
  %5 = getelementptr inbounds [1010 x %struct.vertex], ptr @V, i64 0, i64 %4
  %6 = getelementptr inbounds %struct.vertex, ptr %5, i32 0, i32 1
  %7 = load i32, ptr %6, align 4, !tbaa !9
  %8 = load i32, ptr @nl, align 4, !tbaa !5
  %9 = load i32, ptr @nr, align 4, !tbaa !5
  %10 = add nsw i32 %8, %9
  %11 = add nsw i32 %10, 2
  %12 = icmp slt i32 %7, %11
  br i1 %12, label %13, label %18

13:                                               ; preds = %2
  %14 = load i32, ptr @src, align 4, !tbaa !5
  %15 = call noundef i32 @_Z4isapii(i32 noundef %14, i32 noundef 1000000000)
  %16 = load i32, ptr %1, align 4, !tbaa !5
  %17 = add nsw i32 %16, %15
  store i32 %17, ptr %1, align 4, !tbaa !5
  br label %2, !llvm.loop !11

18:                                               ; preds = %2
  %19 = load i32, ptr %1, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #2
  ret i32 %19
}

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 = { 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 = !{!10, !6, i64 4}
!10 = !{!"_ZTS6vertex", !6, i64 0, !6, i64 4}
!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"

%struct.vertex = type { i32, i32 }

@V = external dso_local local_unnamed_addr global [1010 x %struct.vertex], align 16
@nl = external dso_local local_unnamed_addr global i32, align 4
@nr = external dso_local local_unnamed_addr global i32, align 4
@src = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress uwtable
declare dso_local noundef i32 @_Z4isapii(i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z8max_flowv() local_unnamed_addr #0 {
  %1 = load i32, ptr @src, align 4, !tbaa !5
  %2 = sext i32 %1 to i64
  %3 = getelementptr inbounds [1010 x %struct.vertex], ptr @V, i64 0, i64 %2, i32 1
  %4 = load i32, ptr %3, align 4, !tbaa !9
  %5 = load i32, ptr @nl, align 4, !tbaa !5
  %6 = load i32, ptr @nr, align 4, !tbaa !5
  %7 = add i32 %5, 2
  %8 = add i32 %7, %6
  %9 = icmp slt i32 %4, %8
  br i1 %9, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %0, %.lr.ph
  %10 = phi i32 [ %13, %.lr.ph ], [ %1, %0 ]
  %.02 = phi i32 [ %12, %.lr.ph ], [ 0, %0 ]
  %11 = tail call noundef i32 @_Z4isapii(i32 noundef %10, i32 noundef 1000000000)
  %12 = add nsw i32 %11, %.02
  %13 = load i32, ptr @src, align 4, !tbaa !5
  %14 = sext i32 %13 to i64
  %15 = getelementptr inbounds [1010 x %struct.vertex], ptr @V, i64 0, i64 %14, i32 1
  %16 = load i32, ptr %15, align 4, !tbaa !9
  %17 = load i32, ptr @nl, align 4, !tbaa !5
  %18 = load i32, ptr @nr, align 4, !tbaa !5
  %19 = add i32 %17, 2
  %20 = add i32 %19, %18
  %21 = icmp slt i32 %16, %20
  br i1 %21, label %.lr.ph, label %._crit_edge, !llvm.loop !11

._crit_edge:                                      ; preds = %.lr.ph, %0
  %.0.lcssa = phi i32 [ 0, %0 ], [ %12, %.lr.ph ]
  ret i32 %.0.lcssa
}

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 = !{!6, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !6, i64 4}
!10 = !{!"_ZTS6vertex", !6, i64 0, !6, i64 4}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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