; LLVM IR from tangjz/acm-icpc :: codeforces/complete/491C.ll (Z4pathi)

; 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"

@n = external dso_local global i32, align 4
@g = external dso_local global [55 x [55 x i32]], align 16
@lx = external dso_local global [55 x i32], align 16
@ly = external dso_local global [55 x i32], align 16
@match = external dso_local global [55 x i32], align 16
@sx = external dso_local global [55 x i8], align 16
@sy = external dso_local global [55 x i8], align 16

; Function Attrs: mustprogress uwtable
define dso_local noundef zeroext i1 @_Z4pathi(i32 noundef %0) #0 {
  %2 = alloca i1, align 1
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  %6 = load i32, ptr %3, align 4, !tbaa !5
  %7 = sext i32 %6 to i64
  %8 = getelementptr inbounds [55 x i8], ptr @sx, i64 0, i64 %7
  store i8 1, ptr %8, align 1, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 1, ptr %4, align 4, !tbaa !5
  br label %9

9:                                                ; preds = %60, %1
  %10 = load i32, ptr %4, align 4, !tbaa !5
  %11 = load i32, ptr @n, align 4, !tbaa !5
  %12 = icmp sle i32 %10, %11
  br i1 %12, label %14, label %13

13:                                               ; preds = %9
  store i32 2, ptr %5, align 4
  br label %63

14:                                               ; preds = %9
  %15 = load i32, ptr %4, align 4, !tbaa !5
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds [55 x i8], ptr @sy, i64 0, i64 %16
  %18 = load i8, ptr %17, align 1, !tbaa !9, !range !11, !noundef !12
  %19 = trunc i8 %18 to i1
  br i1 %19, label %59, label %20

20:                                               ; preds = %14
  %21 = load i32, ptr %3, align 4, !tbaa !5
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds [55 x i32], ptr @lx, i64 0, i64 %22
  %24 = load i32, ptr %23, align 4, !tbaa !5
  %25 = load i32, ptr %4, align 4, !tbaa !5
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds [55 x i32], ptr @ly, i64 0, i64 %26
  %28 = load i32, ptr %27, align 4, !tbaa !5
  %29 = add nsw i32 %24, %28
  %30 = load i32, ptr %3, align 4, !tbaa !5
  %31 = sext i32 %30 to i64
  %32 = getelementptr inbounds [55 x [55 x i32]], ptr @g, i64 0, i64 %31
  %33 = load i32, ptr %4, align 4, !tbaa !5
  %34 = sext i32 %33 to i64
  %35 = getelementptr inbounds [55 x i32], ptr %32, i64 0, i64 %34
  %36 = load i32, ptr %35, align 4, !tbaa !5
  %37 = icmp eq i32 %29, %36
  br i1 %37, label %38, label %59

38:                                               ; preds = %20
  %39 = load i32, ptr %4, align 4, !tbaa !5
  %40 = sext i32 %39 to i64
  %41 = getelementptr inbounds [55 x i8], ptr @sy, i64 0, i64 %40
  store i8 1, ptr %41, align 1, !tbaa !9
  %42 = load i32, ptr %4, align 4, !tbaa !5
  %43 = sext i32 %42 to i64
  %44 = getelementptr inbounds [55 x i32], ptr @match, i64 0, i64 %43
  %45 = load i32, ptr %44, align 4, !tbaa !5
  %46 = icmp ne i32 %45, 0
  br i1 %46, label %47, label %53

47:                                               ; preds = %38
  %48 = load i32, ptr %4, align 4, !tbaa !5
  %49 = sext i32 %48 to i64
  %50 = getelementptr inbounds [55 x i32], ptr @match, i64 0, i64 %49
  %51 = load i32, ptr %50, align 4, !tbaa !5
  %52 = call noundef zeroext i1 @_Z4pathi(i32 noundef %51)
  br i1 %52, label %53, label %58

53:                                               ; preds = %47, %38
  %54 = load i32, ptr %3, align 4, !tbaa !5
  %55 = load i32, ptr %4, align 4, !tbaa !5
  %56 = sext i32 %55 to i64
  %57 = getelementptr inbounds [55 x i32], ptr @match, i64 0, i64 %56
  store i32 %54, ptr %57, align 4, !tbaa !5
  store i1 true, ptr %2, align 1
  store i32 1, ptr %5, align 4
  br label %63

58:                                               ; preds = %47
  br label %59

59:                                               ; preds = %58, %20, %14
  br label %60

60:                                               ; preds = %59
  %61 = load i32, ptr %4, align 4, !tbaa !5
  %62 = add nsw i32 %61, 1
  store i32 %62, ptr %4, align 4, !tbaa !5
  br label %9, !llvm.loop !13

63:                                               ; preds = %53, %13
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  %64 = load i32, ptr %5, align 4
  switch i32 %64, label %68 [
    i32 2, label %65
    i32 1, label %66
  ]

65:                                               ; preds = %63
  store i1 false, ptr %2, align 1
  br label %66

66:                                               ; preds = %65, %63
  %67 = load i1, ptr %2, align 1
  ret i1 %67

68:                                               ; preds = %63
  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 = !{!10, !10, i64 0}
!10 = !{!"bool", !7, i64 0}
!11 = !{i8 0, i8 2}
!12 = !{}
!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"

@n = external dso_local local_unnamed_addr global i32, align 4
@g = external dso_local local_unnamed_addr global [55 x [55 x i32]], align 16
@lx = external dso_local local_unnamed_addr global [55 x i32], align 16
@ly = external dso_local local_unnamed_addr global [55 x i32], align 16
@match = external dso_local local_unnamed_addr global [55 x i32], align 16
@sx = external dso_local local_unnamed_addr global [55 x i8], align 16
@sy = external dso_local local_unnamed_addr global [55 x i8], align 16

; Function Attrs: mustprogress nofree nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef zeroext i1 @_Z4pathi(i32 noundef %0) local_unnamed_addr #0 {
  %2 = sext i32 %0 to i64
  %3 = getelementptr inbounds [55 x i8], ptr @sx, i64 0, i64 %2
  store i8 1, ptr %3, align 1, !tbaa !5
  %4 = load i32, ptr @n, align 4, !tbaa !9
  %.not21 = icmp sgt i32 %4, 0
  br i1 %.not21, label %.lr.ph, label %.loopexit

.lr.ph:                                           ; preds = %1
  %5 = getelementptr inbounds [55 x i32], ptr @lx, i64 0, i64 %2
  br label %6

6:                                                ; preds = %.lr.ph, %26
  %7 = phi i32 [ %4, %.lr.ph ], [ %27, %26 ]
  %indvars.iv = phi i64 [ 1, %.lr.ph ], [ %indvars.iv.next, %26 ]
  %8 = getelementptr inbounds [55 x i8], ptr @sy, i64 0, i64 %indvars.iv
  %9 = load i8, ptr %8, align 1, !tbaa !5, !range !11, !noundef !12
  %10 = trunc nuw i8 %9 to i1
  br i1 %10, label %26, label %11

11:                                               ; preds = %6
  %12 = load i32, ptr %5, align 4, !tbaa !9
  %13 = getelementptr inbounds [55 x i32], ptr @ly, i64 0, i64 %indvars.iv
  %14 = load i32, ptr %13, align 4, !tbaa !9
  %15 = add nsw i32 %14, %12
  %16 = getelementptr inbounds [55 x [55 x i32]], ptr @g, i64 0, i64 %2, i64 %indvars.iv
  %17 = load i32, ptr %16, align 4, !tbaa !9
  %18 = icmp eq i32 %15, %17
  br i1 %18, label %19, label %26

19:                                               ; preds = %11
  store i8 1, ptr %8, align 1, !tbaa !5
  %20 = getelementptr inbounds [55 x i32], ptr @match, i64 0, i64 %indvars.iv
  %21 = load i32, ptr %20, align 4, !tbaa !9
  %.not17 = icmp eq i32 %21, 0
  br i1 %.not17, label %24, label %22

22:                                               ; preds = %19
  %23 = tail call noundef zeroext i1 @_Z4pathi(i32 noundef %21)
  br i1 %23, label %24, label %._crit_edge

._crit_edge:                                      ; preds = %22
  %.pre = load i32, ptr @n, align 4, !tbaa !9
  br label %26

24:                                               ; preds = %22, %19
  %25 = getelementptr inbounds [55 x i32], ptr @match, i64 0, i64 %indvars.iv
  store i32 %0, ptr %25, align 4, !tbaa !9
  br label %.loopexit

26:                                               ; preds = %._crit_edge, %6, %11
  %27 = phi i32 [ %.pre, %._crit_edge ], [ %7, %6 ], [ %7, %11 ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %28 = sext i32 %27 to i64
  %.not = icmp slt i64 %indvars.iv, %28
  br i1 %.not, label %6, label %.loopexit, !llvm.loop !13

.loopexit:                                        ; preds = %26, %1, %24
  %.not19 = phi i1 [ true, %24 ], [ false, %1 ], [ false, %26 ]
  ret i1 %.not19
}

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 = !{!"bool", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{i8 0, i8 2}
!12 = !{}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}


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