; LLVM IR from bqi343/cp-notebook :: Contests/USACO Training/Ch 5/5.2 snail.ll (Z5validii)

; 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"

@ar = external dso_local global [120 x [120 x i32]], align 16
@n = external dso_local global i32, align 4

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z5validii(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  %6 = load i32, ptr %4, align 4, !tbaa !5
  %7 = icmp slt i32 %6, 0
  br i1 %7, label %19, label %8

8:                                                ; preds = %2
  %9 = load i32, ptr %4, align 4, !tbaa !5
  %10 = load i32, ptr @n, align 4, !tbaa !5
  %11 = icmp sge i32 %9, %10
  br i1 %11, label %19, label %12

12:                                               ; preds = %8
  %13 = load i32, ptr %5, align 4, !tbaa !5
  %14 = icmp slt i32 %13, 0
  br i1 %14, label %19, label %15

15:                                               ; preds = %12
  %16 = load i32, ptr %5, align 4, !tbaa !5
  %17 = load i32, ptr @n, align 4, !tbaa !5
  %18 = icmp sge i32 %16, %17
  br i1 %18, label %19, label %20

19:                                               ; preds = %15, %12, %8, %2
  store i32 1, ptr %3, align 4
  br label %41

20:                                               ; preds = %15
  %21 = load i32, ptr %4, align 4, !tbaa !5
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds [120 x [120 x i32]], ptr @ar, i64 0, i64 %22
  %24 = load i32, ptr %5, align 4, !tbaa !5
  %25 = sext i32 %24 to i64
  %26 = getelementptr inbounds [120 x i32], ptr %23, i64 0, i64 %25
  %27 = load i32, ptr %26, align 4, !tbaa !5
  %28 = icmp eq i32 %27, 1
  br i1 %28, label %29, label %30

29:                                               ; preds = %20
  store i32 0, ptr %3, align 4
  br label %41

30:                                               ; preds = %20
  %31 = load i32, ptr %4, align 4, !tbaa !5
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds [120 x [120 x i32]], ptr @ar, i64 0, i64 %32
  %34 = load i32, ptr %5, align 4, !tbaa !5
  %35 = sext i32 %34 to i64
  %36 = getelementptr inbounds [120 x i32], ptr %33, i64 0, i64 %35
  %37 = load i32, ptr %36, align 4, !tbaa !5
  %38 = icmp eq i32 %37, 2
  br i1 %38, label %39, label %40

39:                                               ; preds = %30
  store i32 1, ptr %3, align 4
  br label %41

40:                                               ; preds = %30
  store i32 2, ptr %3, align 4
  br label %41

41:                                               ; preds = %40, %39, %29, %19
  %42 = load i32, ptr %3, align 4
  ret i32 %42
}

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"

@ar = external dso_local local_unnamed_addr global [120 x [120 x i32]], align 16
@n = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef range(i32 0, 3) i32 @_Z5validii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp slt i32 %0, 0
  br i1 %3, label %13, label %4

4:                                                ; preds = %2
  %5 = load i32, ptr @n, align 4, !tbaa !5
  %6 = icmp sgt i32 %5, %0
  %7 = icmp sgt i32 %1, -1
  %or.cond.not19 = and i1 %7, %6
  %.not = icmp sgt i32 %5, %1
  %or.cond14 = and i1 %.not, %or.cond.not19
  br i1 %or.cond14, label %8, label %13

8:                                                ; preds = %4
  %9 = zext nneg i32 %0 to i64
  %10 = zext nneg i32 %1 to i64
  %11 = getelementptr inbounds [120 x [120 x i32]], ptr @ar, i64 0, i64 %9, i64 %10
  %12 = load i32, ptr %11, align 4, !tbaa !5
  %switch.selectcmp = icmp eq i32 %12, 2
  %switch.select = select i1 %switch.selectcmp, i32 1, i32 2
  %switch.selectcmp15 = icmp eq i32 %12, 1
  %switch.select16 = select i1 %switch.selectcmp15, i32 0, i32 %switch.select
  br label %13

13:                                               ; preds = %8, %2, %4
  %.0 = phi i32 [ 1, %4 ], [ 1, %2 ], [ %switch.select16, %8 ]
  ret i32 %.0
}

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"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InstCombinePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass