; LLVM IR from imteekay/algorithms :: competitive-programming/acm-icpc-br/regionals_2017_1/A.ll (Z9propagateiii)

; 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"

@segtree = external dso_local global [1048576 x i32], align 16
@lazy = external dso_local global [1048576 x i32], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z9propagateiii(i32 noundef %0, i32 noundef %1, i32 noundef %2) #0 {
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  store i32 %2, ptr %6, align 4, !tbaa !5
  %7 = load i32, ptr %4, align 4, !tbaa !5
  %8 = sext i32 %7 to i64
  %9 = getelementptr inbounds [1048576 x i32], ptr @lazy, i64 0, i64 %8
  %10 = load i32, ptr %9, align 4, !tbaa !5
  %11 = icmp ne i32 %10, 0
  br i1 %11, label %12, label %51

12:                                               ; preds = %3
  %13 = load i32, ptr %4, align 4, !tbaa !5
  %14 = sext i32 %13 to i64
  %15 = getelementptr inbounds [1048576 x i32], ptr @lazy, i64 0, i64 %14
  %16 = load i32, ptr %15, align 4, !tbaa !5
  %17 = load i32, ptr %4, align 4, !tbaa !5
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds [1048576 x i32], ptr @segtree, i64 0, i64 %18
  %20 = load i32, ptr %19, align 4, !tbaa !5
  %21 = add nsw i32 %20, %16
  store i32 %21, ptr %19, align 4, !tbaa !5
  %22 = load i32, ptr %5, align 4, !tbaa !5
  %23 = load i32, ptr %6, align 4, !tbaa !5
  %24 = icmp ne i32 %22, %23
  br i1 %24, label %25, label %47

25:                                               ; preds = %12
  %26 = load i32, ptr %4, align 4, !tbaa !5
  %27 = sext i32 %26 to i64
  %28 = getelementptr inbounds [1048576 x i32], ptr @lazy, i64 0, i64 %27
  %29 = load i32, ptr %28, align 4, !tbaa !5
  %30 = load i32, ptr %4, align 4, !tbaa !5
  %31 = mul nsw i32 %30, 2
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds [1048576 x i32], ptr @lazy, i64 0, i64 %32
  %34 = load i32, ptr %33, align 4, !tbaa !5
  %35 = add nsw i32 %34, %29
  store i32 %35, ptr %33, align 4, !tbaa !5
  %36 = load i32, ptr %4, align 4, !tbaa !5
  %37 = sext i32 %36 to i64
  %38 = getelementptr inbounds [1048576 x i32], ptr @lazy, i64 0, i64 %37
  %39 = load i32, ptr %38, align 4, !tbaa !5
  %40 = load i32, ptr %4, align 4, !tbaa !5
  %41 = mul nsw i32 %40, 2
  %42 = add nsw i32 %41, 1
  %43 = sext i32 %42 to i64
  %44 = getelementptr inbounds [1048576 x i32], ptr @lazy, i64 0, i64 %43
  %45 = load i32, ptr %44, align 4, !tbaa !5
  %46 = add nsw i32 %45, %39
  store i32 %46, ptr %44, align 4, !tbaa !5
  br label %47

47:                                               ; preds = %25, %12
  %48 = load i32, ptr %4, align 4, !tbaa !5
  %49 = sext i32 %48 to i64
  %50 = getelementptr inbounds [1048576 x i32], ptr @lazy, i64 0, i64 %49
  store i32 0, ptr %50, align 4, !tbaa !5
  br label %51

51:                                               ; preds = %47, %3
  ret void
}

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"}


; 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"

@segtree = external dso_local local_unnamed_addr global [1048576 x i32], align 16
@lazy = external dso_local local_unnamed_addr global [1048576 x i32], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(readwrite, argmem: none, inaccessiblemem: none) uwtable
define dso_local void @_Z9propagateiii(i32 noundef %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = sext i32 %0 to i64
  %5 = getelementptr inbounds [1048576 x i32], ptr @lazy, i64 0, i64 %4
  %6 = load i32, ptr %5, align 4, !tbaa !5
  %.not = icmp eq i32 %6, 0
  br i1 %.not, label %24, label %7

7:                                                ; preds = %3
  %8 = getelementptr inbounds [1048576 x i32], ptr @segtree, i64 0, i64 %4
  %9 = load i32, ptr %8, align 4, !tbaa !5
  %10 = add nsw i32 %9, %6
  store i32 %10, ptr %8, align 4, !tbaa !5
  %.not10 = icmp eq i32 %1, %2
  br i1 %.not10, label %23, label %11

11:                                               ; preds = %7
  %12 = shl nsw i32 %0, 1
  %13 = sext i32 %12 to i64
  %14 = getelementptr inbounds [1048576 x i32], ptr @lazy, i64 0, i64 %13
  %15 = load i32, ptr %14, align 8, !tbaa !5
  %16 = add nsw i32 %15, %6
  store i32 %16, ptr %14, align 8, !tbaa !5
  %17 = load i32, ptr %5, align 4, !tbaa !5
  %18 = or disjoint i32 %12, 1
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds [1048576 x i32], ptr @lazy, i64 0, i64 %19
  %21 = load i32, ptr %20, align 4, !tbaa !5
  %22 = add nsw i32 %21, %17
  store i32 %22, ptr %20, align 4, !tbaa !5
  br label %23

23:                                               ; preds = %11, %7
  store i32 0, ptr %5, align 4, !tbaa !5
  br label %24

24:                                               ; preds = %23, %3
  ret void
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn 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,InferAlignmentPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass