; LLVM IR from tangjz/acm-icpc :: lydsy/4050.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"

@fa = external dso_local global [1001 x i32], align 16
@dis = external dso_local global [1001 x i32], align 16

; 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
  store i32 %0, ptr %3, align 4, !tbaa !5
  %5 = load i32, ptr %3, align 4, !tbaa !5
  %6 = load i32, ptr %3, align 4, !tbaa !5
  %7 = sext i32 %6 to i64
  %8 = getelementptr inbounds [1001 x i32], ptr @fa, i64 0, i64 %7
  %9 = load i32, ptr %8, align 4, !tbaa !5
  %10 = icmp eq i32 %5, %9
  br i1 %10, label %11, label %13

11:                                               ; preds = %1
  %12 = load i32, ptr %3, align 4, !tbaa !5
  store i32 %12, ptr %2, align 4
  br label %39

13:                                               ; preds = %1
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  %14 = load i32, ptr %3, align 4, !tbaa !5
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds [1001 x i32], ptr @fa, i64 0, i64 %15
  %17 = load i32, ptr %16, align 4, !tbaa !5
  store i32 %17, ptr %4, align 4, !tbaa !5
  %18 = load i32, ptr %3, align 4, !tbaa !5
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds [1001 x i32], ptr @fa, i64 0, i64 %19
  %21 = load i32, ptr %20, align 4, !tbaa !5
  %22 = call noundef i32 @_Z4findi(i32 noundef %21)
  %23 = load i32, ptr %3, align 4, !tbaa !5
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds [1001 x i32], ptr @fa, i64 0, i64 %24
  store i32 %22, ptr %25, align 4, !tbaa !5
  %26 = load i32, ptr %4, align 4, !tbaa !5
  %27 = sext i32 %26 to i64
  %28 = getelementptr inbounds [1001 x i32], ptr @dis, i64 0, i64 %27
  %29 = load i32, ptr %28, align 4, !tbaa !5
  %30 = load i32, ptr %3, align 4, !tbaa !5
  %31 = sext i32 %30 to i64
  %32 = getelementptr inbounds [1001 x i32], ptr @dis, i64 0, i64 %31
  %33 = load i32, ptr %32, align 4, !tbaa !5
  %34 = xor i32 %33, %29
  store i32 %34, ptr %32, align 4, !tbaa !5
  %35 = load i32, ptr %3, align 4, !tbaa !5
  %36 = sext i32 %35 to i64
  %37 = getelementptr inbounds [1001 x i32], ptr @fa, i64 0, i64 %36
  %38 = load i32, ptr %37, align 4, !tbaa !5
  store i32 %38, ptr %2, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  br label %39

39:                                               ; preds = %13, %11
  %40 = load i32, ptr %2, align 4
  ret i32 %40
}

; 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"}


; 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"

@fa = external dso_local local_unnamed_addr global [1001 x i32], align 16
@dis = external dso_local local_unnamed_addr global [1001 x i32], align 16

; Function Attrs: mustprogress nofree nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef i32 @_Z4findi(i32 noundef %0) local_unnamed_addr #0 {
  %2 = sext i32 %0 to i64
  %3 = getelementptr inbounds [1001 x i32], ptr @fa, i64 0, i64 %2
  %4 = load i32, ptr %3, align 4, !tbaa !5
  %5 = icmp eq i32 %4, %0
  br i1 %5, label %common.ret12, label %6

common.ret12:                                     ; preds = %1, %6
  %common.ret12.op = phi i32 [ %7, %6 ], [ %0, %1 ]
  ret i32 %common.ret12.op

6:                                                ; preds = %1
  %7 = tail call noundef i32 @_Z4findi(i32 noundef %4)
  store i32 %7, ptr %3, align 4, !tbaa !5
  %8 = sext i32 %4 to i64
  %9 = getelementptr inbounds [1001 x i32], ptr @dis, i64 0, i64 %8
  %10 = load i32, ptr %9, align 4, !tbaa !5
  %11 = getelementptr inbounds [1001 x i32], ptr @dis, i64 0, i64 %2
  %12 = load i32, ptr %11, align 4, !tbaa !5
  %13 = xor i32 %12, %10
  store i32 %13, ptr %11, align 4, !tbaa !5
  br label %common.ret12
}

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"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass