; LLVM IR from tangjz/acm-icpc :: usaco/Training/Chapter 2 Bigger challenges/hamming.ll (Z7compareii)

; 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"

@ans = external dso_local global [64 x i32], align 16

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_Z5checkii(i32 noundef, i32 noundef) #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_Z7compareii(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i1, align 1
  %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
  br label %6

6:                                                ; preds = %18, %2
  %7 = load i32, ptr %5, align 4, !tbaa !5
  %8 = icmp ne i32 %7, 0
  br i1 %8, label %9, label %19

9:                                                ; preds = %6
  %10 = load i32, ptr %4, align 4, !tbaa !5
  %11 = load i32, ptr %5, align 4, !tbaa !5
  %12 = add nsw i32 %11, -1
  store i32 %12, ptr %5, align 4, !tbaa !5
  %13 = sext i32 %12 to i64
  %14 = getelementptr inbounds [64 x i32], ptr @ans, i64 0, i64 %13
  %15 = load i32, ptr %14, align 4, !tbaa !5
  %16 = call noundef zeroext i1 @_Z5checkii(i32 noundef %10, i32 noundef %15)
  br i1 %16, label %18, label %17

17:                                               ; preds = %9
  store i1 false, ptr %3, align 1
  br label %20

18:                                               ; preds = %9
  br label %6, !llvm.loop !9

19:                                               ; preds = %6
  store i1 true, ptr %3, align 1
  br label %20

20:                                               ; preds = %19, %17
  %21 = load i1, ptr %3, align 1
  ret i1 %21
}

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"

@ans = external dso_local local_unnamed_addr global [64 x i32], align 16

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_Z5checkii(i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_Z7compareii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = sext i32 %1 to i64
  br label %4

4:                                                ; preds = %6, %2
  %indvars.iv = phi i64 [ %indvars.iv.next, %6 ], [ %3, %2 ]
  %5 = icmp eq i64 %indvars.iv, 0
  br i1 %5, label %10, label %6

6:                                                ; preds = %4
  %indvars.iv.next = add nsw i64 %indvars.iv, -1
  %7 = getelementptr inbounds [64 x i32], ptr @ans, i64 0, i64 %indvars.iv.next
  %8 = load i32, ptr %7, align 4, !tbaa !5
  %9 = tail call noundef zeroext i1 @_Z5checkii(i32 noundef %0, i32 noundef %8)
  br i1 %9, label %4, label %10, !llvm.loop !9

10:                                               ; preds = %4, %6
  ret i1 %5
}

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"}


; Effective O3 passes: GVNPass,GlobalOptPass,IndVarSimplifyPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass