; LLVM IR from freddiev4/dailyprogrammerchallenges :: Intermediate Challenges/Challenge 0027 Intermediate/solutions (solution)

; 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"

; 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: nounwind uwtable
define dso_local i32 @get_doomsday(i32 noundef %0) #1 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  store i32 3, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  %6 = load i32, ptr %2, align 4, !tbaa !5
  %7 = urem i32 %6, 100
  store i32 %7, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  %8 = load i32, ptr %2, align 4, !tbaa !5
  %9 = udiv i32 %8, 100
  %10 = sub i32 %9, 19
  %11 = urem i32 %10, 4
  store i32 %11, ptr %5, align 4, !tbaa !5
  %12 = load i32, ptr %5, align 4, !tbaa !5
  switch i32 %12, label %17 [
    i32 0, label %13
    i32 1, label %14
    i32 2, label %15
    i32 3, label %16
  ]

13:                                               ; preds = %1
  store i32 3, ptr %3, align 4, !tbaa !5
  br label %17

14:                                               ; preds = %1
  store i32 2, ptr %3, align 4, !tbaa !5
  br label %17

15:                                               ; preds = %1
  store i32 0, ptr %3, align 4, !tbaa !5
  br label %17

16:                                               ; preds = %1
  store i32 5, ptr %3, align 4, !tbaa !5
  br label %17

17:                                               ; preds = %16, %15, %14, %13, %1
  %18 = load i32, ptr %4, align 4, !tbaa !5
  %19 = sdiv i32 %18, 12
  %20 = load i32, ptr %3, align 4, !tbaa !5
  %21 = add nsw i32 %20, %19
  store i32 %21, ptr %3, align 4, !tbaa !5
  %22 = load i32, ptr %4, align 4, !tbaa !5
  %23 = srem i32 %22, 12
  %24 = load i32, ptr %3, align 4, !tbaa !5
  %25 = add nsw i32 %24, %23
  store i32 %25, ptr %3, align 4, !tbaa !5
  %26 = load i32, ptr %4, align 4, !tbaa !5
  %27 = srem i32 %26, 12
  %28 = sdiv i32 %27, 4
  %29 = load i32, ptr %3, align 4, !tbaa !5
  %30 = add nsw i32 %29, %28
  store i32 %30, ptr %3, align 4, !tbaa !5
  %31 = load i32, ptr %3, align 4, !tbaa !5
  %32 = srem i32 %31, 7
  store i32 %32, ptr %3, align 4, !tbaa !5
  %33 = load i32, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret i32 %33
}

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

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local range(i32 0, 7) i32 @get_doomsday(i32 noundef %0) local_unnamed_addr #0 {
switch.lookup:
  %1 = udiv i32 %0, 100
  %2 = shl nuw nsw i32 %1, 3
  %3 = add nuw nsw i32 %2, 8
  %switch.shiftamt = and i32 %3, 24
  %switch.downshift = lshr i32 83886595, %switch.shiftamt
  %switch.masked = trunc i32 %switch.downshift to i8
  %4 = urem i32 %0, 100
  %.lhs.trunc = trunc nuw nsw i32 %4 to i8
  %5 = udiv i8 %.lhs.trunc, 12
  %6 = urem i8 %.lhs.trunc, 12
  %7 = lshr i8 %6, 2
  %8 = add nuw nsw i8 %6, %5
  %9 = add nuw nsw i8 %8, %7
  %.lhs.trunc13 = add nuw nsw i8 %9, %switch.masked
  %10 = urem i8 %.lhs.trunc13, 7
  %.zext14 = zext nneg i8 %10 to i32
  ret i32 %.zext14
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(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)"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,ReassociatePass,SCCPPass,SROAPass,SimplifyCFGPass