; LLVM IR from tangjz/acm-icpc :: lydsy/1221.ll (Z8dsu_findi)

; 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"

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

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z8dsu_findi(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  %3 = load i32, ptr %2, align 4, !tbaa !5
  %4 = icmp slt i32 %3, 0
  br i1 %4, label %11, label %5

5:                                                ; preds = %1
  %6 = load i32, ptr %2, align 4, !tbaa !5
  %7 = sext i32 %6 to i64
  %8 = getelementptr inbounds [1001 x i32], ptr @dsu, i64 0, i64 %7
  %9 = load i32, ptr %8, align 4, !tbaa !5
  %10 = icmp slt i32 %9, -1
  br i1 %10, label %11, label %13

11:                                               ; preds = %5, %1
  %12 = load i32, ptr %2, align 4, !tbaa !5
  br label %22

13:                                               ; preds = %5
  %14 = load i32, ptr %2, align 4, !tbaa !5
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds [1001 x i32], ptr @dsu, i64 0, i64 %15
  %17 = load i32, ptr %16, align 4, !tbaa !5
  %18 = call noundef i32 @_Z8dsu_findi(i32 noundef %17)
  %19 = load i32, ptr %2, align 4, !tbaa !5
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds [1001 x i32], ptr @dsu, i64 0, i64 %20
  store i32 %18, ptr %21, align 4, !tbaa !5
  br label %22

22:                                               ; preds = %13, %11
  %23 = phi i32 [ %12, %11 ], [ %18, %13 ]
  ret i32 %23
}

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 = !{!"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"

@dsu = 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 @_Z8dsu_findi(i32 noundef %0) local_unnamed_addr #0 {
  %2 = icmp slt i32 %0, 0
  br i1 %2, label %common.ret6, label %3

3:                                                ; preds = %1
  %4 = zext nneg i32 %0 to i64
  %5 = getelementptr inbounds [1001 x i32], ptr @dsu, i64 0, i64 %4
  %6 = load i32, ptr %5, align 4, !tbaa !5
  %7 = icmp slt i32 %6, -1
  br i1 %7, label %common.ret6, label %8

common.ret6:                                      ; preds = %1, %3, %8
  %common.ret6.op = phi i32 [ %9, %8 ], [ %0, %3 ], [ %0, %1 ]
  ret i32 %common.ret6.op

8:                                                ; preds = %3
  %9 = tail call noundef i32 @_Z8dsu_findi(i32 noundef %6)
  store i32 %9, ptr %5, align 4, !tbaa !5
  br label %common.ret6
}

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,IPSCCPPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass