; LLVM IR from hanzohasashi33/Competetive_programming :: Snippets/DSA_PROBLEMS (String_Mapping_using_Rollinghash)

; 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: nounwind uwtable
define dso_local i32 @stringmatch(ptr noundef %0, ptr noundef %1, i32 noundef %2, i32 noundef %3, i32 noundef %4) #0 {
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  %11 = alloca i32, align 4
  %12 = alloca i32, align 4
  %13 = alloca i32, align 4
  store ptr %0, ptr %7, align 8, !tbaa !5
  store ptr %1, ptr %8, align 8, !tbaa !5
  store i32 %2, ptr %9, align 4, !tbaa !9
  store i32 %3, ptr %10, align 4, !tbaa !9
  store i32 %4, ptr %11, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %12) #2
  store i32 0, ptr %12, align 4, !tbaa !9
  store i32 0, ptr %12, align 4, !tbaa !9
  br label %14

14:                                               ; preds = %36, %5
  %15 = load i32, ptr %12, align 4, !tbaa !9
  %16 = load i32, ptr %10, align 4, !tbaa !9
  %17 = icmp slt i32 %15, %16
  br i1 %17, label %18, label %39

18:                                               ; preds = %14
  %19 = load ptr, ptr %7, align 8, !tbaa !5
  %20 = load i32, ptr %11, align 4, !tbaa !9
  %21 = load i32, ptr %12, align 4, !tbaa !9
  %22 = add nsw i32 %20, %21
  %23 = sext i32 %22 to i64
  %24 = getelementptr inbounds i8, ptr %19, i64 %23
  %25 = load i8, ptr %24, align 1, !tbaa !11
  %26 = sext i8 %25 to i32
  %27 = load ptr, ptr %8, align 8, !tbaa !5
  %28 = load i32, ptr %12, align 4, !tbaa !9
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds i8, ptr %27, i64 %29
  %31 = load i8, ptr %30, align 1, !tbaa !11
  %32 = sext i8 %31 to i32
  %33 = icmp ne i32 %26, %32
  br i1 %33, label %34, label %35

34:                                               ; preds = %18
  br label %39

35:                                               ; preds = %18
  br label %36

36:                                               ; preds = %35
  %37 = load i32, ptr %12, align 4, !tbaa !9
  %38 = add nsw i32 %37, 1
  store i32 %38, ptr %12, align 4, !tbaa !9
  br label %14, !llvm.loop !12

39:                                               ; preds = %34, %14
  %40 = load i32, ptr %12, align 4, !tbaa !9
  %41 = load i32, ptr %10, align 4, !tbaa !9
  %42 = icmp eq i32 %40, %41
  br i1 %42, label %43, label %44

43:                                               ; preds = %39
  store i32 1, ptr %6, align 4
  store i32 1, ptr %13, align 4
  br label %45

44:                                               ; preds = %39
  store i32 0, ptr %6, align 4
  store i32 1, ptr %13, align 4
  br label %45

45:                                               ; preds = %44, %43
  call void @llvm.lifetime.end.p0(i64 4, ptr %12) #2
  %46 = load i32, ptr %6, align 4
  ret i32 %46
}

; 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

attributes #0 = { 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 #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"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"

; Function Attrs: nofree norecurse nosync nounwind memory(argmem: read) uwtable
define dso_local range(i32 0, 2) i32 @stringmatch(ptr nocapture noundef readonly %0, ptr nocapture noundef readonly %1, i32 noundef %2, i32 noundef %3, i32 noundef %4) local_unnamed_addr #0 {
  %6 = icmp sgt i32 %3, 0
  br i1 %6, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %5
  %7 = sext i32 %4 to i64
  %wide.trip.count = zext nneg i32 %3 to i64
  %invariant.gep = getelementptr i8, ptr %0, i64 %7
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %11
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next, %11 ]
  %gep = getelementptr i8, ptr %invariant.gep, i64 %indvars.iv
  %8 = load i8, ptr %gep, align 1, !tbaa !5
  %9 = getelementptr inbounds i8, ptr %1, i64 %indvars.iv
  %10 = load i8, ptr %9, align 1, !tbaa !5
  %.not = icmp eq i8 %8, %10
  br i1 %.not, label %11, label %._crit_edge.loopexit.split.loop.exit

11:                                               ; preds = %.lr.ph
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !8

._crit_edge.loopexit.split.loop.exit:             ; preds = %.lr.ph
  %12 = trunc nuw nsw i64 %indvars.iv to i32
  br label %._crit_edge

._crit_edge:                                      ; preds = %11, %._crit_edge.loopexit.split.loop.exit, %5
  %.0.lcssa = phi i32 [ 0, %5 ], [ %12, %._crit_edge.loopexit.split.loop.exit ], [ %3, %11 ]
  %13 = icmp eq i32 %.0.lcssa, %3
  %. = zext i1 %13 to i32
  ret i32 %.
}

attributes #0 = { nofree norecurse nosync nounwind memory(argmem: read) 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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass