; LLVM IR from ippeb/ACM-ICPC :: data_structure/binary_indexed_tree/binary_indexed_tree.ll (Z10readSinglei)

; 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"

@T = external dso_local global [100000 x i32], align 16

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z10readSinglei(i32 noundef %0) #1 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  %5 = load i32, ptr %2, align 4, !tbaa !5
  %6 = sext i32 %5 to i64
  %7 = getelementptr inbounds [100000 x i32], ptr @T, i64 0, i64 %6
  %8 = load i32, ptr %7, align 4, !tbaa !5
  store i32 %8, ptr %3, align 4, !tbaa !5
  %9 = load i32, ptr %2, align 4, !tbaa !5
  %10 = icmp sgt i32 %9, 0
  br i1 %10, label %11, label %38

11:                                               ; preds = %1
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  %12 = load i32, ptr %2, align 4, !tbaa !5
  %13 = load i32, ptr %2, align 4, !tbaa !5
  %14 = load i32, ptr %2, align 4, !tbaa !5
  %15 = sub nsw i32 0, %14
  %16 = and i32 %13, %15
  %17 = sub nsw i32 %12, %16
  store i32 %17, ptr %4, align 4, !tbaa !5
  %18 = load i32, ptr %2, align 4, !tbaa !5
  %19 = add nsw i32 %18, -1
  store i32 %19, ptr %2, align 4, !tbaa !5
  br label %20

20:                                               ; preds = %24, %11
  %21 = load i32, ptr %2, align 4, !tbaa !5
  %22 = load i32, ptr %4, align 4, !tbaa !5
  %23 = icmp ne i32 %21, %22
  br i1 %23, label %24, label %37

24:                                               ; preds = %20
  %25 = load i32, ptr %2, align 4, !tbaa !5
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds [100000 x i32], ptr @T, i64 0, i64 %26
  %28 = load i32, ptr %27, align 4, !tbaa !5
  %29 = load i32, ptr %3, align 4, !tbaa !5
  %30 = sub nsw i32 %29, %28
  store i32 %30, ptr %3, align 4, !tbaa !5
  %31 = load i32, ptr %2, align 4, !tbaa !5
  %32 = load i32, ptr %2, align 4, !tbaa !5
  %33 = sub nsw i32 0, %32
  %34 = and i32 %31, %33
  %35 = load i32, ptr %2, align 4, !tbaa !5
  %36 = sub nsw i32 %35, %34
  store i32 %36, ptr %2, align 4, !tbaa !5
  br label %20, !llvm.loop !9

37:                                               ; preds = %20
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  br label %38

38:                                               ; preds = %37, %1
  %39 = load i32, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret i32 %39
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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"}
!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"

@T = external dso_local local_unnamed_addr global [100000 x i32], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef i32 @_Z10readSinglei(i32 noundef %0) local_unnamed_addr #0 {
  %2 = sext i32 %0 to i64
  %3 = getelementptr inbounds [100000 x i32], ptr @T, i64 0, i64 %2
  %4 = load i32, ptr %3, align 4, !tbaa !5
  %5 = icmp sgt i32 %0, 0
  br i1 %5, label %6, label %.loopexit

6:                                                ; preds = %1
  %.not = add nuw i32 %0, 2147483647
  %7 = and i32 %.not, %0
  %8 = add nsw i32 %0, -1
  %.not1618 = icmp eq i32 %8, %7
  br i1 %.not1618, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %6, %.lr.ph
  %.020 = phi i32 [ %13, %.lr.ph ], [ %8, %6 ]
  %.01419 = phi i32 [ %12, %.lr.ph ], [ %4, %6 ]
  %9 = sext i32 %.020 to i64
  %10 = getelementptr inbounds [100000 x i32], ptr @T, i64 0, i64 %9
  %11 = load i32, ptr %10, align 4, !tbaa !5
  %12 = sub nsw i32 %.01419, %11
  %.not17 = add i32 %.020, -1
  %13 = and i32 %.not17, %.020
  %.not16 = icmp eq i32 %13, %7
  br i1 %.not16, label %.loopexit, label %.lr.ph, !llvm.loop !9

.loopexit:                                        ; preds = %.lr.ph, %6, %1
  %.1 = phi i32 [ %4, %1 ], [ %4, %6 ], [ %12, %.lr.ph ]
  ret i32 %.1
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(read, 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"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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