; LLVM IR from bqi343/cp-notebook :: Contests/USACO Solutions/2013-14/Open 2014/14 Open G3 (Model).ll (Z6recalci)

; 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"

@SEG = external dso_local global [65536 x i32], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z6recalci(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 = sdiv i32 %3, 2
  store i32 %4, ptr %2, align 4, !tbaa !5
  br label %5

5:                                                ; preds = %28, %1
  %6 = load i32, ptr %2, align 4, !tbaa !5
  %7 = icmp ne i32 %6, 0
  br i1 %7, label %8, label %31

8:                                                ; preds = %5
  %9 = load i32, ptr %2, align 4, !tbaa !5
  %10 = mul nsw i32 2, %9
  %11 = sext i32 %10 to i64
  %12 = getelementptr inbounds [65536 x i32], ptr @SEG, i64 0, i64 %11
  %13 = load i32, ptr %12, align 4, !tbaa !5
  %14 = sext i32 %13 to i64
  %15 = load i32, ptr %2, align 4, !tbaa !5
  %16 = mul nsw i32 2, %15
  %17 = add nsw i32 %16, 1
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds [65536 x i32], ptr @SEG, i64 0, i64 %18
  %20 = load i32, ptr %19, align 4, !tbaa !5
  %21 = sext i32 %20 to i64
  %22 = mul nsw i64 %14, %21
  %23 = srem i64 %22, 1234567
  %24 = trunc i64 %23 to i32
  %25 = load i32, ptr %2, align 4, !tbaa !5
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds [65536 x i32], ptr @SEG, i64 0, i64 %26
  store i32 %24, ptr %27, align 4, !tbaa !5
  br label %28

28:                                               ; preds = %8
  %29 = load i32, ptr %2, align 4, !tbaa !5
  %30 = sdiv i32 %29, 2
  store i32 %30, ptr %2, align 4, !tbaa !5
  br label %5, !llvm.loop !9

31:                                               ; preds = %5
  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"}
!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"

@SEG = external dso_local local_unnamed_addr global [65536 x i32], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) uwtable
define dso_local void @_Z6recalci(i32 noundef %0) local_unnamed_addr #0 {
  %.0.in.off6 = add i32 %0, 1
  %.not7 = icmp ult i32 %.0.in.off6, 3
  br i1 %.not7, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1, %.lr.ph
  %.0.in8 = phi i32 [ %.0, %.lr.ph ], [ %0, %1 ]
  %.0 = sdiv i32 %.0.in8, 2
  %2 = shl nsw i32 %.0, 1
  %3 = sext i32 %2 to i64
  %4 = getelementptr inbounds [65536 x i32], ptr @SEG, i64 0, i64 %3
  %5 = load i32, ptr %4, align 8, !tbaa !5
  %6 = sext i32 %5 to i64
  %7 = or disjoint i32 %2, 1
  %8 = sext i32 %7 to i64
  %9 = getelementptr inbounds [65536 x i32], ptr @SEG, i64 0, i64 %8
  %10 = load i32, ptr %9, align 4, !tbaa !5
  %11 = sext i32 %10 to i64
  %12 = mul nsw i64 %11, %6
  %13 = srem i64 %12, 1234567
  %14 = trunc nsw i64 %13 to i32
  %15 = sext i32 %.0 to i64
  %16 = getelementptr inbounds [65536 x i32], ptr @SEG, i64 0, i64 %15
  store i32 %14, ptr %16, align 4, !tbaa !5
  %.0.in.off = add nsw i32 %.0, 1
  %.not = icmp ult i32 %.0.in.off, 3
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %1
  ret void
}

attributes #0 = { mustprogress nofree norecurse 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"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferAlignmentPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass