; LLVM IR from tangjz/acm-icpc :: poj/1274.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"

@m = external dso_local global i32, align 4
@link = external dso_local global [401 x i32], align 16
@g = external dso_local global [201 x [201 x i8]], align 16
@y = external dso_local global [201 x i8], align 16

; Function Attrs: mustprogress uwtable
define dso_local noundef zeroext i1 @_Z4findi(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
  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 = %50, %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 %10, label %53

10:                                               ; preds = %6
  %11 = load i32, ptr %3, align 4, !tbaa !5
  %12 = sext i32 %11 to i64
  %13 = getelementptr inbounds [201 x [201 x i8]], ptr @g, i64 0, i64 %12
  %14 = load i32, ptr %4, align 4, !tbaa !5
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds [201 x i8], ptr %13, i64 0, i64 %15
  %17 = load i8, ptr %16, align 1, !tbaa !9, !range !11, !noundef !12
  %18 = trunc i8 %17 to i1
  br i1 %18, label %19, label %49

19:                                               ; preds = %10
  %20 = load i32, ptr %4, align 4, !tbaa !5
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds [201 x i8], ptr @y, i64 0, i64 %21
  %23 = load i8, ptr %22, align 1, !tbaa !9, !range !11, !noundef !12
  %24 = trunc i8 %23 to i1
  br i1 %24, label %49, label %25

25:                                               ; preds = %19
  %26 = load i32, ptr %4, align 4, !tbaa !5
  %27 = sext i32 %26 to i64
  %28 = getelementptr inbounds [201 x i8], ptr @y, i64 0, i64 %27
  store i8 1, ptr %28, align 1, !tbaa !9
  %29 = load i32, ptr %4, align 4, !tbaa !5
  %30 = add nsw i32 %29, 200
  %31 = sext i32 %30 to i64
  %32 = getelementptr inbounds [401 x i32], ptr @link, i64 0, i64 %31
  %33 = load i32, ptr %32, align 4, !tbaa !5
  %34 = icmp eq i32 %33, 0
  br i1 %34, label %42, label %35

35:                                               ; preds = %25
  %36 = load i32, ptr %4, align 4, !tbaa !5
  %37 = add nsw i32 %36, 200
  %38 = sext i32 %37 to i64
  %39 = getelementptr inbounds [401 x i32], ptr @link, i64 0, i64 %38
  %40 = load i32, ptr %39, align 4, !tbaa !5
  %41 = call noundef zeroext i1 @_Z4findi(i32 noundef %40)
  br i1 %41, label %42, label %48

42:                                               ; preds = %35, %25
  %43 = load i32, ptr %3, align 4, !tbaa !5
  %44 = load i32, ptr %4, align 4, !tbaa !5
  %45 = add nsw i32 %44, 200
  %46 = sext i32 %45 to i64
  %47 = getelementptr inbounds [401 x i32], ptr @link, i64 0, i64 %46
  store i32 %43, ptr %47, align 4, !tbaa !5
  store i1 true, ptr %2, align 1
  store i32 1, ptr %5, align 4
  br label %54

48:                                               ; preds = %35
  br label %49

49:                                               ; preds = %48, %19, %10
  br label %50

50:                                               ; preds = %49
  %51 = load i32, ptr %4, align 4, !tbaa !5
  %52 = add nsw i32 %51, 1
  store i32 %52, ptr %4, align 4, !tbaa !5
  br label %6, !llvm.loop !13

53:                                               ; preds = %6
  store i1 false, ptr %2, align 1
  store i32 1, ptr %5, align 4
  br label %54

54:                                               ; preds = %53, %42
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  %55 = load i1, ptr %2, align 1
  ret i1 %55
}

; 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"

@m = external dso_local local_unnamed_addr global i32, align 4
@link = external dso_local local_unnamed_addr global [401 x i32], align 16
@g = external dso_local local_unnamed_addr global [201 x [201 x i8]], align 16
@y = external dso_local local_unnamed_addr global [201 x i8], align 16

; Function Attrs: mustprogress nofree nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef zeroext i1 @_Z4findi(i32 noundef %0) local_unnamed_addr #0 {
  %2 = load i32, ptr @m, align 4, !tbaa !5
  %.not15 = icmp sgt i32 %2, 0
  br i1 %.not15, label %.lr.ph, label %.loopexit

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

4:                                                ; preds = %.lr.ph, %22
  %5 = phi i32 [ %2, %.lr.ph ], [ %23, %22 ]
  %indvars.iv = phi i64 [ 1, %.lr.ph ], [ %indvars.iv.next, %22 ]
  %6 = getelementptr inbounds [201 x [201 x i8]], ptr @g, i64 0, i64 %3, i64 %indvars.iv
  %7 = load i8, ptr %6, align 1, !tbaa !9, !range !11, !noundef !12
  %8 = trunc nuw i8 %7 to i1
  br i1 %8, label %9, label %22

9:                                                ; preds = %4
  %10 = getelementptr inbounds [201 x i8], ptr @y, i64 0, i64 %indvars.iv
  %11 = load i8, ptr %10, align 1, !tbaa !9, !range !11, !noundef !12
  %12 = trunc nuw i8 %11 to i1
  br i1 %12, label %22, label %13

13:                                               ; preds = %9
  store i8 1, ptr %10, align 1, !tbaa !9
  %14 = add nuw nsw i64 %indvars.iv, 200
  %15 = getelementptr inbounds [401 x i32], ptr @link, i64 0, i64 %14
  %16 = load i32, ptr %15, align 4, !tbaa !5
  %17 = icmp eq i32 %16, 0
  br i1 %17, label %20, label %18

18:                                               ; preds = %13
  %19 = tail call noundef zeroext i1 @_Z4findi(i32 noundef %16)
  br i1 %19, label %20, label %._crit_edge

._crit_edge:                                      ; preds = %18
  %.pre = load i32, ptr @m, align 4, !tbaa !5
  br label %22

20:                                               ; preds = %18, %13
  %21 = getelementptr inbounds [401 x i32], ptr @link, i64 0, i64 %14
  store i32 %0, ptr %21, align 4, !tbaa !5
  br label %.loopexit

22:                                               ; preds = %._crit_edge, %4, %9
  %23 = phi i32 [ %.pre, %._crit_edge ], [ %5, %4 ], [ %5, %9 ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %24 = sext i32 %23 to i64
  %.not = icmp slt i64 %indvars.iv, %24
  br i1 %.not, label %4, label %.loopexit, !llvm.loop !13

.loopexit:                                        ; preds = %22, %1, %20
  %.not13 = phi i1 [ true, %20 ], [ false, %1 ], [ false, %22 ]
  ret i1 %.not13
}

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 = !{!10, !10, i64 0}
!10 = !{!"bool", !7, i64 0}
!11 = !{i8 0, i8 2}
!12 = !{}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}


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