; LLVM IR from ravireddy07/cpp-book :: src/Google-competitions/KickStart/2020-H-Rugby.ll (Z4calcxx)

; 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 i64, align 8
@x = external dso_local global [100005 x i64], align 16
@y = external dso_local global [100005 x i64], align 16

; Function Attrs: mustprogress uwtable
define dso_local noundef i64 @_Z4calcxx(i64 noundef %0, i64 noundef %1) #0 {
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i64, align 8
  %6 = alloca i64, align 8
  store i64 %0, ptr %3, align 8, !tbaa !5
  store i64 %1, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  store i64 0, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  store i64 1, ptr %6, align 8, !tbaa !5
  br label %7

7:                                                ; preds = %30, %2
  %8 = load i64, ptr %6, align 8, !tbaa !5
  %9 = load i64, ptr @n, align 8, !tbaa !5
  %10 = icmp sle i64 %8, %9
  br i1 %10, label %12, label %11

11:                                               ; preds = %7
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  br label %33

12:                                               ; preds = %7
  %13 = load i64, ptr %6, align 8, !tbaa !5
  %14 = getelementptr inbounds [100005 x i64], ptr @x, i64 0, i64 %13
  %15 = load i64, ptr %14, align 8, !tbaa !5
  %16 = load i64, ptr %3, align 8, !tbaa !5
  %17 = load i64, ptr %6, align 8, !tbaa !5
  %18 = add nsw i64 %16, %17
  %19 = sub nsw i64 %15, %18
  %20 = call noundef i64 @_ZSt3absx(i64 noundef %19)
  %21 = load i64, ptr %6, align 8, !tbaa !5
  %22 = getelementptr inbounds [100005 x i64], ptr @y, i64 0, i64 %21
  %23 = load i64, ptr %22, align 8, !tbaa !5
  %24 = load i64, ptr %4, align 8, !tbaa !5
  %25 = sub nsw i64 %23, %24
  %26 = call noundef i64 @_ZSt3absx(i64 noundef %25)
  %27 = add nsw i64 %20, %26
  %28 = load i64, ptr %5, align 8, !tbaa !5
  %29 = add nsw i64 %28, %27
  store i64 %29, ptr %5, align 8, !tbaa !5
  br label %30

30:                                               ; preds = %12
  %31 = load i64, ptr %6, align 8, !tbaa !5
  %32 = add nsw i64 %31, 1
  store i64 %32, ptr %6, align 8, !tbaa !5
  br label %7, !llvm.loop !9

33:                                               ; preds = %11
  %34 = load i64, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  ret i64 %34
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZSt3absx(i64 noundef) #2

; 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 = { inlinehint 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 #3 = { 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 = !{!"long long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"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"

@n = external dso_local local_unnamed_addr global i64, align 8
@x = external dso_local local_unnamed_addr global [100005 x i64], align 16
@y = external dso_local local_unnamed_addr global [100005 x i64], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_Z4calcxx(i64 noundef %0, i64 noundef %1) local_unnamed_addr #0 {
  %3 = load i64, ptr @n, align 8, !tbaa !5
  %.not11 = icmp slt i64 %3, 1
  br i1 %.not11, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %.lr.ph, %2
  %.09.lcssa = phi i64 [ 0, %2 ], [ %14, %.lr.ph ]
  ret i64 %.09.lcssa

.lr.ph:                                           ; preds = %2, %.lr.ph
  %.013 = phi i64 [ %15, %.lr.ph ], [ 1, %2 ]
  %.0912 = phi i64 [ %14, %.lr.ph ], [ 0, %2 ]
  %4 = getelementptr inbounds [100005 x i64], ptr @x, i64 0, i64 %.013
  %5 = load i64, ptr %4, align 8, !tbaa !5
  %6 = add i64 %.013, %0
  %7 = sub i64 %5, %6
  %8 = tail call noundef i64 @_ZSt3absx(i64 noundef %7)
  %9 = getelementptr inbounds [100005 x i64], ptr @y, i64 0, i64 %.013
  %10 = load i64, ptr %9, align 8, !tbaa !5
  %11 = sub nsw i64 %10, %1
  %12 = tail call noundef i64 @_ZSt3absx(i64 noundef %11)
  %13 = add i64 %8, %.0912
  %14 = add i64 %13, %12
  %15 = add nuw nsw i64 %.013, 1
  %16 = load i64, ptr @n, align 8, !tbaa !5
  %.not.not = icmp slt i64 %.013, %16
  br i1 %.not.not, label %.lr.ph, label %._crit_edge, !llvm.loop !9
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZSt3absx(i64 noundef) local_unnamed_addr #1

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 = { inlinehint 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 = !{!"long long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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