; LLVM IR from lzyrapx/Competitive-Programming :: HDUOJ/2063（二分图匹配）.ll (Z4findi)

; 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"

@mp = external dso_local global [505 x [505 x i32]], align 16
@vis = external dso_local global [505 x i32], align 16
@match = external dso_local global [505 x i32], align 16
@m = external dso_local global i32, align 4

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z4findi(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 1, ptr %4, align 4, !tbaa !5
  br label %6

6:                                                ; preds = %49, %1
  %7 = load i32, ptr %4, align 4, !tbaa !5
  %8 = load i32, ptr @m, align 4, !tbaa !5
  %9 = icmp sle i32 %7, %8
  br i1 %9, label %11, label %10

10:                                               ; preds = %6
  store i32 2, ptr %5, align 4
  br label %52

11:                                               ; preds = %6
  %12 = load i32, ptr %4, align 4, !tbaa !5
  %13 = sext i32 %12 to i64
  %14 = getelementptr inbounds [505 x i32], ptr @vis, i64 0, i64 %13
  %15 = load i32, ptr %14, align 4, !tbaa !5
  %16 = icmp eq i32 %15, 0
  br i1 %16, label %17, label %48

17:                                               ; preds = %11
  %18 = load i32, ptr %4, align 4, !tbaa !5
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds [505 x [505 x i32]], ptr @mp, i64 0, i64 %19
  %21 = load i32, ptr %3, align 4, !tbaa !5
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds [505 x i32], ptr %20, i64 0, i64 %22
  %24 = load i32, ptr %23, align 4, !tbaa !5
  %25 = icmp ne i32 %24, 0
  br i1 %25, label %26, label %48

26:                                               ; preds = %17
  %27 = load i32, ptr %4, align 4, !tbaa !5
  %28 = sext i32 %27 to i64
  %29 = getelementptr inbounds [505 x i32], ptr @vis, i64 0, i64 %28
  store i32 1, ptr %29, align 4, !tbaa !5
  %30 = load i32, ptr %4, align 4, !tbaa !5
  %31 = sext i32 %30 to i64
  %32 = getelementptr inbounds [505 x i32], ptr @match, i64 0, i64 %31
  %33 = load i32, ptr %32, align 4, !tbaa !5
  %34 = icmp eq i32 %33, -1
  br i1 %34, label %42, label %35

35:                                               ; preds = %26
  %36 = load i32, ptr %4, align 4, !tbaa !5
  %37 = sext i32 %36 to i64
  %38 = getelementptr inbounds [505 x i32], ptr @match, i64 0, i64 %37
  %39 = load i32, ptr %38, align 4, !tbaa !5
  %40 = call noundef i32 @_Z4findi(i32 noundef %39)
  %41 = icmp ne i32 %40, 0
  br i1 %41, label %42, label %47

42:                                               ; preds = %35, %26
  %43 = load i32, ptr %3, align 4, !tbaa !5
  %44 = load i32, ptr %4, align 4, !tbaa !5
  %45 = sext i32 %44 to i64
  %46 = getelementptr inbounds [505 x i32], ptr @match, i64 0, i64 %45
  store i32 %43, ptr %46, align 4, !tbaa !5
  store i32 1, ptr %2, align 4
  store i32 1, ptr %5, align 4
  br label %52

47:                                               ; preds = %35
  br label %48

48:                                               ; preds = %47, %17, %11
  br label %49

49:                                               ; preds = %48
  %50 = load i32, ptr %4, align 4, !tbaa !5
  %51 = add nsw i32 %50, 1
  store i32 %51, ptr %4, align 4, !tbaa !5
  br label %6, !llvm.loop !9

52:                                               ; preds = %42, %10
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  %53 = load i32, ptr %5, align 4
  switch i32 %53, label %57 [
    i32 2, label %54
    i32 1, label %55
  ]

54:                                               ; preds = %52
  store i32 0, ptr %2, align 4
  br label %55

55:                                               ; preds = %54, %52
  %56 = load i32, ptr %2, align 4
  ret i32 %56

57:                                               ; preds = %52
  unreachable
}

; 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 = { 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 = 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"

@mp = external dso_local local_unnamed_addr global [505 x [505 x i32]], align 16
@vis = external dso_local local_unnamed_addr global [505 x i32], align 16
@match = external dso_local local_unnamed_addr global [505 x i32], align 16
@m = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress nofree nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef range(i32 0, 2) i32 @_Z4findi(i32 noundef %0) local_unnamed_addr #0 {
  %2 = load i32, ptr @m, align 4, !tbaa !5
  %.not20 = icmp sgt i32 %2, 0
  br i1 %.not20, label %.lr.ph, label %.loopexit

.lr.ph:                                           ; preds = %1
  %3 = sext i32 %0 to i64
  br label %4

4:                                                ; preds = %.lr.ph, %20
  %5 = phi i32 [ %2, %.lr.ph ], [ %21, %20 ]
  %indvars.iv = phi i64 [ 1, %.lr.ph ], [ %indvars.iv.next, %20 ]
  %6 = getelementptr inbounds [505 x i32], ptr @vis, i64 0, i64 %indvars.iv
  %7 = load i32, ptr %6, align 4, !tbaa !5
  %8 = icmp eq i32 %7, 0
  br i1 %8, label %9, label %20

9:                                                ; preds = %4
  %10 = getelementptr inbounds [505 x [505 x i32]], ptr @mp, i64 0, i64 %indvars.iv, i64 %3
  %11 = load i32, ptr %10, align 4, !tbaa !5
  %.not15 = icmp eq i32 %11, 0
  br i1 %.not15, label %20, label %12

12:                                               ; preds = %9
  store i32 1, ptr %6, align 4, !tbaa !5
  %13 = getelementptr inbounds [505 x i32], ptr @match, i64 0, i64 %indvars.iv
  %14 = load i32, ptr %13, align 4, !tbaa !5
  %15 = icmp eq i32 %14, -1
  br i1 %15, label %18, label %16

16:                                               ; preds = %12
  %17 = tail call noundef i32 @_Z4findi(i32 noundef %14)
  %.not16 = icmp eq i32 %17, 0
  br i1 %.not16, label %._crit_edge, label %18

._crit_edge:                                      ; preds = %16
  %.pre = load i32, ptr @m, align 4, !tbaa !5
  br label %20

18:                                               ; preds = %16, %12
  %19 = getelementptr inbounds [505 x i32], ptr @match, i64 0, i64 %indvars.iv
  store i32 %0, ptr %19, align 4, !tbaa !5
  br label %.loopexit

20:                                               ; preds = %._crit_edge, %4, %9
  %21 = phi i32 [ %.pre, %._crit_edge ], [ %5, %4 ], [ %5, %9 ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %22 = sext i32 %21 to i64
  %.not = icmp slt i64 %indvars.iv, %22
  br i1 %.not, label %4, label %.loopexit, !llvm.loop !9

.loopexit:                                        ; preds = %20, %1, %18
  %.not18 = phi i32 [ 1, %18 ], [ 0, %1 ], [ 0, %20 ]
  ret i32 %.not18
}

attributes #0 = { mustprogress nofree nosync nounwind memory(readwrite, argmem: none, 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++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass