; LLVM IR from brpapa/algorithms :: solutions/codeforces/17-A.ll (Z8checkSumv)

; 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"

@isPrime = external dso_local global [1001 x i8], align 16
@isSum = external dso_local global [1001 x i8], align 16

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z8checkSumv() #2 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  call void @llvm.memset.p0.i64(ptr align 16 @isSum, i8 0, i64 1001, i1 false)
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #3
  store i32 2, ptr %1, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #3
  store i32 3, ptr %2, align 4, !tbaa !5
  br label %3

3:                                                ; preds = %25, %0
  %4 = load i32, ptr %2, align 4, !tbaa !5
  %5 = add nsw i32 1, %4
  %6 = load i32, ptr %1, align 4, !tbaa !5
  %7 = add nsw i32 %5, %6
  %8 = icmp slt i32 %7, 1001
  br i1 %8, label %10, label %9

9:                                                ; preds = %3
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #3
  br label %28

10:                                               ; preds = %3
  %11 = load i32, ptr %2, align 4, !tbaa !5
  %12 = sext i32 %11 to i64
  %13 = getelementptr inbounds [1001 x i8], ptr @isPrime, i64 0, i64 %12
  %14 = load i8, ptr %13, align 1, !tbaa !9, !range !11, !noundef !12
  %15 = trunc i8 %14 to i1
  br i1 %15, label %16, label %24

16:                                               ; preds = %10
  %17 = load i32, ptr %2, align 4, !tbaa !5
  %18 = add nsw i32 1, %17
  %19 = load i32, ptr %1, align 4, !tbaa !5
  %20 = add nsw i32 %18, %19
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds [1001 x i8], ptr @isSum, i64 0, i64 %21
  store i8 1, ptr %22, align 1, !tbaa !9
  %23 = load i32, ptr %2, align 4, !tbaa !5
  store i32 %23, ptr %1, align 4, !tbaa !5
  br label %24

24:                                               ; preds = %16, %10
  br label %25

25:                                               ; preds = %24
  %26 = load i32, ptr %2, align 4, !tbaa !5
  %27 = add nsw i32 %26, 1
  store i32 %27, ptr %2, align 4, !tbaa !5
  br label %3, !llvm.loop !13

28:                                               ; preds = %9
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #3
  ret void
}

attributes #0 = { nocallback nofree nounwind willreturn memory(argmem: write) }
attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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" }
attributes #3 = { 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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"bool", !7, i64 0}
!11 = !{i8 0, i8 2}
!12 = !{}
!13 = distinct !{!13, !14}
!14 = !{!"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"

@isPrime = external dso_local local_unnamed_addr global [1001 x i8], align 16
@isSum = external dso_local local_unnamed_addr global [1001 x i8], align 16

; Function Attrs: mustprogress nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #0

; Function Attrs: mustprogress nofree norecurse nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) uwtable
define dso_local void @_Z8checkSumv() local_unnamed_addr #1 {
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 16 dereferenceable(1001) @isSum, i8 0, i64 1001, i1 false)
  br label %2

1:                                                ; preds = %11
  ret void

2:                                                ; preds = %0, %11
  %indvars.iv11 = phi i64 [ 3, %0 ], [ %indvars.iv.next12, %11 ]
  %indvars.iv = phi i64 [ 4, %0 ], [ %indvars.iv.next, %11 ]
  %3 = phi i32 [ 6, %0 ], [ %13, %11 ]
  %.079 = phi i32 [ 2, %0 ], [ %.1, %11 ]
  %4 = getelementptr inbounds [1001 x i8], ptr @isPrime, i64 0, i64 %indvars.iv11
  %5 = load i8, ptr %4, align 1, !tbaa !5, !range !9, !noundef !10
  %6 = trunc nuw i8 %5 to i1
  br i1 %6, label %7, label %11

7:                                                ; preds = %2
  %8 = sext i32 %3 to i64
  %9 = getelementptr inbounds [1001 x i8], ptr @isSum, i64 0, i64 %8
  store i8 1, ptr %9, align 1, !tbaa !5
  %10 = trunc nuw nsw i64 %indvars.iv11 to i32
  br label %11

11:                                               ; preds = %2, %7
  %.1 = phi i32 [ %10, %7 ], [ %.079, %2 ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %12 = trunc nuw nsw i64 %indvars.iv.next to i32
  %13 = add nsw i32 %.1, %12
  %14 = icmp slt i32 %13, 1001
  %indvars.iv.next12 = add nuw nsw i64 %indvars.iv11, 1
  br i1 %14, label %2, label %1, !llvm.loop !11
}

attributes #0 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: write) }
attributes #1 = { 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 = !{!"bool", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{i8 0, i8 2}
!10 = !{}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LoopRotatePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass