; LLVM IR from LeetCode-in-C/LeetCode-in-C :: src/main/c/g0001_0100/s0010_regular_expression_matching (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"

@cache = external dso_local global ptr, align 8

; Function Attrs: nounwind uwtable
define dso_local void @initializeCache(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !5
  %8 = load i32, ptr %3, align 4, !tbaa !5
  %9 = add nsw i32 %8, 1
  %10 = sext i32 %9 to i64
  %11 = mul i64 %10, 8
  %12 = call noalias ptr @malloc(i64 noundef %11) #3
  store ptr %12, ptr @cache, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #4
  store i32 0, ptr %5, align 4, !tbaa !5
  br label %13

13:                                               ; preds = %46, %2
  %14 = load i32, ptr %5, align 4, !tbaa !5
  %15 = load i32, ptr %3, align 4, !tbaa !5
  %16 = icmp sle i32 %14, %15
  br i1 %16, label %18, label %17

17:                                               ; preds = %13
  store i32 2, ptr %6, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #4
  br label %49

18:                                               ; preds = %13
  %19 = load i32, ptr %4, align 4, !tbaa !5
  %20 = add nsw i32 %19, 1
  %21 = sext i32 %20 to i64
  %22 = mul i64 %21, 4
  %23 = call noalias ptr @malloc(i64 noundef %22) #3
  %24 = load ptr, ptr @cache, align 8, !tbaa !9
  %25 = load i32, ptr %5, align 4, !tbaa !5
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds ptr, ptr %24, i64 %26
  store ptr %23, ptr %27, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #4
  store i32 0, ptr %7, align 4, !tbaa !5
  br label %28

28:                                               ; preds = %42, %18
  %29 = load i32, ptr %7, align 4, !tbaa !5
  %30 = load i32, ptr %4, align 4, !tbaa !5
  %31 = icmp sle i32 %29, %30
  br i1 %31, label %33, label %32

32:                                               ; preds = %28
  store i32 5, ptr %6, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #4
  br label %45

33:                                               ; preds = %28
  %34 = load ptr, ptr @cache, align 8, !tbaa !9
  %35 = load i32, ptr %5, align 4, !tbaa !5
  %36 = sext i32 %35 to i64
  %37 = getelementptr inbounds ptr, ptr %34, i64 %36
  %38 = load ptr, ptr %37, align 8, !tbaa !9
  %39 = load i32, ptr %7, align 4, !tbaa !5
  %40 = sext i32 %39 to i64
  %41 = getelementptr inbounds i32, ptr %38, i64 %40
  store i32 -1, ptr %41, align 4, !tbaa !5
  br label %42

42:                                               ; preds = %33
  %43 = load i32, ptr %7, align 4, !tbaa !5
  %44 = add nsw i32 %43, 1
  store i32 %44, ptr %7, align 4, !tbaa !5
  br label %28, !llvm.loop !11

45:                                               ; preds = %32
  br label %46

46:                                               ; preds = %45
  %47 = load i32, ptr %5, align 4, !tbaa !5
  %48 = add nsw i32 %47, 1
  store i32 %48, ptr %5, align 4, !tbaa !5
  br label %13, !llvm.loop !13

49:                                               ; preds = %17
  ret void
}

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

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 = { nounwind allocsize(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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { nounwind allocsize(0) }
attributes #4 = { 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"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}


; 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"

@cache = external dso_local local_unnamed_addr global ptr, align 8

; Function Attrs: nofree nounwind uwtable
define dso_local void @initializeCache(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = add i32 %0, 1
  %4 = sext i32 %3 to i64
  %5 = shl nsw i64 %4, 3
  %6 = tail call noalias ptr @malloc(i64 noundef %5) #3
  store ptr %6, ptr @cache, align 8, !tbaa !5
  %.not15 = icmp slt i32 %0, 0
  br i1 %.not15, label %._crit_edge19, label %.lr.ph18

.lr.ph18:                                         ; preds = %2
  %7 = add i32 %1, 1
  %8 = sext i32 %7 to i64
  %9 = shl nsw i64 %8, 2
  %.not1213 = icmp slt i32 %1, 0
  br i1 %.not1213, label %.lr.ph18.split.us.preheader, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %.lr.ph18
  %10 = zext i32 %7 to i64
  %11 = shl nuw nsw i64 %10, 2
  %wide.trip.count = zext i32 %3 to i64
  br label %.lr.ph

.lr.ph18.split.us.preheader:                      ; preds = %.lr.ph18
  %wide.trip.count26 = zext i32 %3 to i64
  br label %.lr.ph18.split.us

.lr.ph18.split.us:                                ; preds = %.lr.ph18.split.us.preheader, %.lr.ph18.split.us
  %indvars.iv23 = phi i64 [ 0, %.lr.ph18.split.us.preheader ], [ %indvars.iv.next24, %.lr.ph18.split.us ]
  %12 = tail call noalias ptr @malloc(i64 noundef %9) #3
  %13 = load ptr, ptr @cache, align 8, !tbaa !5
  %14 = getelementptr inbounds ptr, ptr %13, i64 %indvars.iv23
  store ptr %12, ptr %14, align 8, !tbaa !5
  %indvars.iv.next24 = add nuw nsw i64 %indvars.iv23, 1
  %exitcond27.not = icmp eq i64 %indvars.iv.next24, %wide.trip.count26
  br i1 %exitcond27.not, label %._crit_edge19, label %.lr.ph18.split.us, !llvm.loop !9

._crit_edge19:                                    ; preds = %.lr.ph, %.lr.ph18.split.us, %2
  ret void

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %15 = phi ptr [ %6, %.lr.ph.preheader ], [ %18, %.lr.ph ]
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next, %.lr.ph ]
  %16 = tail call noalias ptr @malloc(i64 noundef %9) #3
  %17 = getelementptr inbounds ptr, ptr %15, i64 %indvars.iv
  store ptr %16, ptr %17, align 8, !tbaa !5
  %18 = load ptr, ptr @cache, align 8, !tbaa !5
  %19 = getelementptr inbounds ptr, ptr %18, i64 %indvars.iv
  %20 = load ptr, ptr %19, align 8, !tbaa !5
  tail call void @llvm.memset.p0.i64(ptr align 4 %20, i8 -1, i64 %11, i1 false), !tbaa !11
  %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_edge19, label %.lr.ph, !llvm.loop !9
}

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #1

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #2

attributes #0 = { nofree 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 = { mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" "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 = { nocallback nofree nounwind willreturn memory(argmem: write) }
attributes #3 = { nounwind allocsize(0) }

!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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!12, !12, i64 0}
!12 = !{!"int", !7, i64 0}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopIdiomRecognizePass,LoopRotatePass,LoopSimplifyCFGPass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass