; LLVM IR from Izaron/ACM-ICPC :: Russian Council of School Olympiads (R.S.O.Sh.)/IOIP/IOIP 2016/seating.ll (Z8calc_sumii)

; 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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z2gri(i32 noundef) #0

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z2csii(i32 noundef, i32 noundef) #0

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z8calc_sumii(i32 noundef %0, i32 noundef %1) #1 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  %6 = load i32, ptr %4, align 4, !tbaa !5
  %7 = icmp slt i32 %6, 0
  br i1 %7, label %8, label %17

8:                                                ; preds = %2
  %9 = load i32, ptr %5, align 4, !tbaa !5
  %10 = call noundef i32 @_Z8calc_sumii(i32 noundef 0, i32 noundef %9)
  %11 = load i32, ptr %4, align 4, !tbaa !5
  %12 = call noundef i32 @_Z2gri(i32 noundef %11)
  %13 = load i32, ptr @n, align 4, !tbaa !5
  %14 = sub nsw i32 %13, 1
  %15 = call noundef i32 @_Z2csii(i32 noundef %12, i32 noundef %14)
  %16 = add nsw i32 %10, %15
  store i32 %16, ptr %3, align 4
  br label %34

17:                                               ; preds = %2
  %18 = load i32, ptr %5, align 4, !tbaa !5
  %19 = load i32, ptr @n, align 4, !tbaa !5
  %20 = icmp sge i32 %18, %19
  br i1 %20, label %21, label %30

21:                                               ; preds = %17
  %22 = load i32, ptr %4, align 4, !tbaa !5
  %23 = load i32, ptr @n, align 4, !tbaa !5
  %24 = sub nsw i32 %23, 1
  %25 = call noundef i32 @_Z8calc_sumii(i32 noundef %22, i32 noundef %24)
  %26 = load i32, ptr %5, align 4, !tbaa !5
  %27 = call noundef i32 @_Z2gri(i32 noundef %26)
  %28 = call noundef i32 @_Z2csii(i32 noundef 0, i32 noundef %27)
  %29 = add nsw i32 %25, %28
  store i32 %29, ptr %3, align 4
  br label %34

30:                                               ; preds = %17
  %31 = load i32, ptr %4, align 4, !tbaa !5
  %32 = load i32, ptr %5, align 4, !tbaa !5
  %33 = call noundef i32 @_Z2csii(i32 noundef %31, i32 noundef %32)
  store i32 %33, ptr %3, align 4
  br label %34

34:                                               ; preds = %30, %21, %8
  %35 = load i32, ptr %3, align 4
  ret i32 %35
}

attributes #0 = { mustprogress nounwind 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 = { 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"

@n = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z2gri(i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z2csii(i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z8calc_sumii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp slt i32 %0, 0
  br i1 %3, label %4, label %11

common.ret13:                                     ; preds = %13, %4, %common.ret
  %common.ret13.op = phi i32 [ %19, %common.ret ], [ %10, %4 ], [ %18, %13 ]
  ret i32 %common.ret13.op

4:                                                ; preds = %2
  %5 = tail call noundef i32 @_Z8calc_sumii(i32 noundef 0, i32 noundef %1)
  %6 = tail call noundef i32 @_Z2gri(i32 noundef %0)
  %7 = load i32, ptr @n, align 4, !tbaa !5
  %8 = add nsw i32 %7, -1
  %9 = tail call noundef i32 @_Z2csii(i32 noundef %6, i32 noundef %8)
  %10 = add nsw i32 %9, %5
  br label %common.ret13

11:                                               ; preds = %2
  %12 = load i32, ptr @n, align 4, !tbaa !5
  %.not = icmp sgt i32 %12, %1
  br i1 %.not, label %common.ret, label %13

13:                                               ; preds = %11
  %14 = add nsw i32 %12, -1
  %15 = tail call noundef i32 @_Z8calc_sumii(i32 noundef %0, i32 noundef %14)
  %16 = tail call noundef i32 @_Z2gri(i32 noundef %1)
  %17 = tail call noundef i32 @_Z2csii(i32 noundef 0, i32 noundef %16)
  %18 = add nsw i32 %17, %15
  br label %common.ret13

common.ret:                                       ; preds = %11
  %19 = tail call noundef i32 @_Z2csii(i32 noundef %0, i32 noundef %1)
  br label %common.ret13
}

attributes #0 = { mustprogress nounwind 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,InstCombinePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass