; LLVM IR from JessonYue/LeetCodeLearning :: Array/cuijilin/Day20200714.ll (Z13firstUniqCharPc)

; 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: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z13firstUniqCharPc(ptr noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  %4 = alloca [26 x i32], align 16
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 104, ptr %4) #4
  call void @llvm.memset.p0.i64(ptr align 16 %4, i8 0, i64 104, i1 false)
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #4
  %9 = load ptr, ptr %3, align 8, !tbaa !5
  %10 = call i64 @strlen(ptr noundef %9) #5
  %11 = trunc i64 %10 to i32
  store i32 %11, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #4
  store i32 0, ptr %6, align 4, !tbaa !9
  br label %12

12:                                               ; preds = %29, %1
  %13 = load i32, ptr %6, align 4, !tbaa !9
  %14 = load i32, ptr %5, align 4, !tbaa !9
  %15 = icmp slt i32 %13, %14
  br i1 %15, label %17, label %16

16:                                               ; preds = %12
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #4
  br label %32

17:                                               ; preds = %12
  %18 = load ptr, ptr %3, align 8, !tbaa !5
  %19 = load i32, ptr %6, align 4, !tbaa !9
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds i8, ptr %18, i64 %20
  %22 = load i8, ptr %21, align 1, !tbaa !11
  %23 = sext i8 %22 to i32
  %24 = sub nsw i32 %23, 97
  %25 = sext i32 %24 to i64
  %26 = getelementptr inbounds [26 x i32], ptr %4, i64 0, i64 %25
  %27 = load i32, ptr %26, align 4, !tbaa !9
  %28 = add nsw i32 %27, 1
  store i32 %28, ptr %26, align 4, !tbaa !9
  br label %29

29:                                               ; preds = %17
  %30 = load i32, ptr %6, align 4, !tbaa !9
  %31 = add nsw i32 %30, 1
  store i32 %31, ptr %6, align 4, !tbaa !9
  br label %12, !llvm.loop !12

32:                                               ; preds = %16
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #4
  store i32 0, ptr %7, align 4, !tbaa !9
  br label %33

33:                                               ; preds = %53, %32
  %34 = load i32, ptr %7, align 4, !tbaa !9
  %35 = load i32, ptr %5, align 4, !tbaa !9
  %36 = icmp slt i32 %34, %35
  br i1 %36, label %38, label %37

37:                                               ; preds = %33
  store i32 5, ptr %8, align 4
  br label %56

38:                                               ; preds = %33
  %39 = load ptr, ptr %3, align 8, !tbaa !5
  %40 = load i32, ptr %7, align 4, !tbaa !9
  %41 = sext i32 %40 to i64
  %42 = getelementptr inbounds i8, ptr %39, i64 %41
  %43 = load i8, ptr %42, align 1, !tbaa !11
  %44 = sext i8 %43 to i32
  %45 = sub nsw i32 %44, 97
  %46 = sext i32 %45 to i64
  %47 = getelementptr inbounds [26 x i32], ptr %4, i64 0, i64 %46
  %48 = load i32, ptr %47, align 4, !tbaa !9
  %49 = icmp eq i32 %48, 1
  br i1 %49, label %50, label %52

50:                                               ; preds = %38
  %51 = load i32, ptr %7, align 4, !tbaa !9
  store i32 %51, ptr %2, align 4
  store i32 1, ptr %8, align 4
  br label %56

52:                                               ; preds = %38
  br label %53

53:                                               ; preds = %52
  %54 = load i32, ptr %7, align 4, !tbaa !9
  %55 = add nsw i32 %54, 1
  store i32 %55, ptr %7, align 4, !tbaa !9
  br label %33, !llvm.loop !14

56:                                               ; preds = %50, %37
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #4
  %57 = load i32, ptr %8, align 4
  switch i32 %57, label %59 [
    i32 5, label %58
  ]

58:                                               ; preds = %56
  store i32 -1, ptr %2, align 4
  store i32 1, ptr %8, align 4
  br label %59

59:                                               ; preds = %58, %56
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #4
  call void @llvm.lifetime.end.p0(i64 104, ptr %4) #4
  %60 = load i32, ptr %2, align 4
  ret i32 %60
}

; 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: nounwind willreturn memory(read)
declare i64 @strlen(ptr noundef) #3

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

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" }
attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { nocallback nofree nounwind willreturn memory(argmem: write) }
attributes #3 = { nounwind willreturn memory(read) "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 #4 = { nounwind }
attributes #5 = { nounwind willreturn memory(read) }

!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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = distinct !{!14, !13}


; 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: mustprogress nofree nounwind willreturn memory(argmem: read) uwtable
define dso_local noundef i32 @_Z13firstUniqCharPc(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) #4
  call void @llvm.memset.p0.i64(ptr noundef nonnull align 16 dereferenceable(104) %2, i8 0, i64 104, i1 false)
  %3 = tail call i64 @strlen(ptr noundef nonnull dereferenceable(1) %0) #5
  %4 = trunc i64 %3 to i32
  %5 = icmp sgt i32 %4, 0
  br i1 %5, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %1
  %wide.trip.count = and i64 %3, 2147483647
  %xtraiter = and i64 %3, 1
  %6 = icmp eq i64 %wide.trip.count, 1
  br i1 %6, label %.preheader.unr-lcssa, label %.lr.ph.preheader.new

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %unroll_iter = sub nsw i64 %wide.trip.count, %xtraiter
  br label %.lr.ph

.preheader.unr-lcssa:                             ; preds = %.lr.ph, %.lr.ph.preheader
  %indvars.iv.unr = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next.1, %.lr.ph ]
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %.preheader, label %.lr.ph.epil

.lr.ph.epil:                                      ; preds = %.preheader.unr-lcssa
  %7 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv.unr
  %8 = load i8, ptr %7, align 1, !tbaa !5
  %9 = sext i8 %8 to i64
  %10 = add nsw i64 %9, -97
  %11 = getelementptr inbounds [26 x i32], ptr %2, i64 0, i64 %10
  %12 = load i32, ptr %11, align 4, !tbaa !8
  %13 = add nsw i32 %12, 1
  store i32 %13, ptr %11, align 4, !tbaa !8
  br label %.preheader

.preheader:                                       ; preds = %.preheader.unr-lcssa, %.lr.ph.epil
  br i1 %5, label %.lr.ph20.preheader, label %._crit_edge

.lr.ph20.preheader:                               ; preds = %.preheader
  %wide.trip.count27 = and i64 %3, 2147483647
  br label %.lr.ph20

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader.new ], [ %indvars.iv.next.1, %.lr.ph ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.1, %.lr.ph ]
  %14 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv
  %15 = load i8, ptr %14, align 1, !tbaa !5
  %16 = sext i8 %15 to i64
  %17 = add nsw i64 %16, -97
  %18 = getelementptr inbounds [26 x i32], ptr %2, i64 0, i64 %17
  %19 = load i32, ptr %18, align 4, !tbaa !8
  %20 = add nsw i32 %19, 1
  store i32 %20, ptr %18, align 4, !tbaa !8
  %indvars.iv.next = or disjoint i64 %indvars.iv, 1
  %21 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv.next
  %22 = load i8, ptr %21, align 1, !tbaa !5
  %23 = sext i8 %22 to i64
  %24 = add nsw i64 %23, -97
  %25 = getelementptr inbounds [26 x i32], ptr %2, i64 0, i64 %24
  %26 = load i32, ptr %25, align 4, !tbaa !8
  %27 = add nsw i32 %26, 1
  store i32 %27, ptr %25, align 4, !tbaa !8
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %niter.next.1 = add i64 %niter, 2
  %niter.ncmp.1 = icmp eq i64 %niter.next.1, %unroll_iter
  br i1 %niter.ncmp.1, label %.preheader.unr-lcssa, label %.lr.ph, !llvm.loop !10

.lr.ph20:                                         ; preds = %.lr.ph20.preheader, %35
  %indvars.iv24 = phi i64 [ 0, %.lr.ph20.preheader ], [ %indvars.iv.next25, %35 ]
  %28 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv24
  %29 = load i8, ptr %28, align 1, !tbaa !5
  %30 = sext i8 %29 to i64
  %31 = add nsw i64 %30, -97
  %32 = getelementptr inbounds [26 x i32], ptr %2, i64 0, i64 %31
  %33 = load i32, ptr %32, align 4, !tbaa !8
  %34 = icmp eq i32 %33, 1
  br i1 %34, label %._crit_edge.loopexit.split.loop.exit, label %35

35:                                               ; preds = %.lr.ph20
  %indvars.iv.next25 = add nuw nsw i64 %indvars.iv24, 1
  %exitcond28.not = icmp eq i64 %indvars.iv.next25, %wide.trip.count27
  br i1 %exitcond28.not, label %._crit_edge, label %.lr.ph20, !llvm.loop !12

._crit_edge.loopexit.split.loop.exit:             ; preds = %.lr.ph20
  %36 = trunc nuw nsw i64 %indvars.iv24 to i32
  br label %._crit_edge

._crit_edge:                                      ; preds = %35, %._crit_edge.loopexit.split.loop.exit, %1, %.preheader
  %spec.select = phi i32 [ -1, %.preheader ], [ -1, %1 ], [ %36, %._crit_edge.loopexit.split.loop.exit ], [ -1, %35 ]
  call void @llvm.lifetime.end.p0(i64 104, ptr nonnull %2) #4
  ret i32 %spec.select
}

; 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 nofree nounwind willreturn memory(argmem: read)
declare i64 @strlen(ptr nocapture noundef) local_unnamed_addr #3

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

attributes #0 = { mustprogress nofree nounwind willreturn 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" }
attributes #1 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: write) }
attributes #3 = { mustprogress nofree nounwind willreturn memory(argmem: read) "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 #4 = { nounwind }
attributes #5 = { nounwind willreturn memory(read) }

!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++ TBAA"}
!8 = !{!9, !9, i64 0}
!9 = !{!"int", !6, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.mustprogress"}
!12 = distinct !{!12, !11}


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