; LLVM IR from DimitrisJim/leetcode_solutions :: C/Algorithms (2351)

; 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 signext i8 @repeatedCharacter(ptr noundef %0) #0 {
  %2 = alloca i8, align 1
  %3 = alloca ptr, align 8
  %4 = alloca [26 x i32], align 16
  %5 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 104, ptr %4) #3
  call void @llvm.memset.p0.i64(ptr align 16 %4, i8 0, i64 104, i1 false)
  br label %6

6:                                                ; preds = %22, %1
  %7 = load ptr, ptr %3, align 8, !tbaa !5
  %8 = load i8, ptr %7, align 1, !tbaa !9
  %9 = icmp ne i8 %8, 0
  br i1 %9, label %10, label %32

10:                                               ; preds = %6
  %11 = load ptr, ptr %3, align 8, !tbaa !5
  %12 = load i8, ptr %11, align 1, !tbaa !9
  %13 = sext i8 %12 to i32
  %14 = sub nsw i32 %13, 97
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds [26 x i32], ptr %4, i64 0, i64 %15
  %17 = load i32, ptr %16, align 4, !tbaa !10
  %18 = icmp ne i32 %17, 0
  br i1 %18, label %19, label %22

19:                                               ; preds = %10
  %20 = load ptr, ptr %3, align 8, !tbaa !5
  %21 = load i8, ptr %20, align 1, !tbaa !9
  store i8 %21, ptr %2, align 1
  store i32 1, ptr %5, align 4
  br label %33

22:                                               ; preds = %10
  %23 = load ptr, ptr %3, align 8, !tbaa !5
  %24 = getelementptr inbounds i8, ptr %23, i32 1
  store ptr %24, ptr %3, align 8, !tbaa !5
  %25 = load i8, ptr %23, align 1, !tbaa !9
  %26 = sext i8 %25 to i32
  %27 = sub nsw i32 %26, 97
  %28 = sext i32 %27 to i64
  %29 = getelementptr inbounds [26 x i32], ptr %4, i64 0, i64 %28
  %30 = load i32, ptr %29, align 4, !tbaa !10
  %31 = add nsw i32 %30, 1
  store i32 %31, ptr %29, align 4, !tbaa !10
  br label %6, !llvm.loop !12

32:                                               ; preds = %6
  store i8 32, ptr %2, align 1
  store i32 1, ptr %5, align 4
  br label %33

33:                                               ; preds = %32, %19
  call void @llvm.lifetime.end.p0(i64 104, ptr %4) #3
  %34 = load i8, ptr %2, align 1
  ret i8 %34
}

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

; 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 = { nocallback nofree nounwind willreturn memory(argmem: write) }
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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!7, !7, i64 0}
!10 = !{!11, !11, i64 0}
!11 = !{!"int", !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(read, inaccessiblemem: none) uwtable
define dso_local signext range(i8 1, 0) i8 @repeatedCharacter(ptr nocapture noundef readonly %0) local_unnamed_addr #0 {
  %2 = alloca [26 x i32], align 16
  call void @llvm.lifetime.start.p0(i64 104, ptr nonnull %2) #3
  call void @llvm.memset.p0.i64(ptr noundef nonnull align 16 dereferenceable(104) %2, i8 0, i64 104, i1 false)
  %3 = load i8, ptr %0, align 1, !tbaa !5
  %.not8 = icmp eq i8 %3, 0
  br i1 %.not8, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1, %9
  %4 = phi i8 [ %11, %9 ], [ %3, %1 ]
  %.09 = phi ptr [ %10, %9 ], [ %0, %1 ]
  %5 = sext i8 %4 to i64
  %6 = add nsw i64 %5, -97
  %7 = getelementptr inbounds [26 x i32], ptr %2, i64 0, i64 %6
  %8 = load i32, ptr %7, align 4, !tbaa !8
  %.not7 = icmp eq i32 %8, 0
  br i1 %.not7, label %9, label %._crit_edge

9:                                                ; preds = %.lr.ph
  %10 = getelementptr inbounds i8, ptr %.09, i64 1
  store i32 1, ptr %7, align 4, !tbaa !8
  %11 = load i8, ptr %10, align 1, !tbaa !5
  %.not = icmp eq i8 %11, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !10

._crit_edge:                                      ; preds = %.lr.ph, %9, %1
  %.04 = phi i8 [ 32, %1 ], [ 32, %9 ], [ %4, %.lr.ph ]
  call void @llvm.lifetime.end.p0(i64 104, ptr nonnull %2) #3
  ret i8 %.04
}

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

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

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

attributes #0 = { nofree norecurse nosync nounwind memory(read, 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" }
attributes #1 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: write) }
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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = !{!9, !9, i64 0}
!9 = !{!"int", !6, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass