; LLVM IR from eyangch/competitive-programming :: USACOcontests/gold/2014.01/skilevel.ll (Z4findx)

; 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"

@par = external dso_local global [250000 x i64], align 16

; Function Attrs: mustprogress uwtable
define dso_local noundef i64 @_Z4findx(i64 noundef %0) #0 {
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  store i64 %0, ptr %3, align 8, !tbaa !5
  %4 = load i64, ptr %3, align 8, !tbaa !5
  %5 = getelementptr inbounds [250000 x i64], ptr @par, i64 0, i64 %4
  %6 = load i64, ptr %5, align 8, !tbaa !5
  %7 = load i64, ptr %3, align 8, !tbaa !5
  %8 = icmp eq i64 %6, %7
  br i1 %8, label %9, label %11

9:                                                ; preds = %1
  %10 = load i64, ptr %3, align 8, !tbaa !5
  store i64 %10, ptr %2, align 8
  br label %21

11:                                               ; preds = %1
  %12 = load i64, ptr %3, align 8, !tbaa !5
  %13 = getelementptr inbounds [250000 x i64], ptr @par, i64 0, i64 %12
  %14 = load i64, ptr %13, align 8, !tbaa !5
  %15 = call noundef i64 @_Z4findx(i64 noundef %14)
  %16 = load i64, ptr %3, align 8, !tbaa !5
  %17 = getelementptr inbounds [250000 x i64], ptr @par, i64 0, i64 %16
  store i64 %15, ptr %17, align 8, !tbaa !5
  %18 = load i64, ptr %3, align 8, !tbaa !5
  %19 = getelementptr inbounds [250000 x i64], ptr @par, i64 0, i64 %18
  %20 = load i64, ptr %19, align 8, !tbaa !5
  store i64 %20, ptr %2, align 8
  br label %21

21:                                               ; preds = %11, %9
  %22 = load i64, ptr %2, align 8
  ret i64 %22
}

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 = !{!"long long", !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"

@par = external dso_local local_unnamed_addr global [250000 x i64], align 16

; Function Attrs: mustprogress nofree nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef i64 @_Z4findx(i64 noundef %0) local_unnamed_addr #0 {
  %2 = getelementptr inbounds [250000 x i64], ptr @par, i64 0, i64 %0
  %3 = load i64, ptr %2, align 8, !tbaa !5
  %4 = icmp eq i64 %3, %0
  br i1 %4, label %common.ret9, label %5

common.ret9:                                      ; preds = %1, %5
  %common.ret9.op = phi i64 [ %6, %5 ], [ %0, %1 ]
  ret i64 %common.ret9.op

5:                                                ; preds = %1
  %6 = tail call noundef i64 @_Z4findx(i64 noundef %3)
  store i64 %6, ptr %2, align 8, !tbaa !5
  br label %common.ret9
}

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 = !{!"long long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}


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