; LLVM IR from JessonYue/LeetCodeLearning :: Array/linchuanxin/Algorithm/day46_0716_比较含退格的字符串 (day46_leetcode844)

; 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: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind uwtable
define dso_local i32 @returnDeleteStrLength(ptr noundef %0, i32 noundef %1) #1 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  %8 = load ptr, ptr %4, align 8, !tbaa !5
  %9 = icmp eq ptr %8, null
  br i1 %9, label %13, label %10

10:                                               ; preds = %2
  %11 = load i32, ptr %5, align 4, !tbaa !9
  %12 = icmp eq i32 %11, 0
  br i1 %12, label %13, label %14

13:                                               ; preds = %10, %2
  store i32 0, ptr %3, align 4
  br label %52

14:                                               ; preds = %10
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 0, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  store i32 0, ptr %7, align 4, !tbaa !9
  br label %15

15:                                               ; preds = %47, %14
  %16 = load i32, ptr %7, align 4, !tbaa !9
  %17 = load i32, ptr %5, align 4, !tbaa !9
  %18 = icmp slt i32 %16, %17
  br i1 %18, label %20, label %19

19:                                               ; preds = %15
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  br label %50

20:                                               ; preds = %15
  %21 = load ptr, ptr %4, align 8, !tbaa !5
  %22 = load i32, ptr %7, align 4, !tbaa !9
  %23 = sext i32 %22 to i64
  %24 = getelementptr inbounds i8, ptr %21, i64 %23
  %25 = load i8, ptr %24, align 1, !tbaa !11
  %26 = sext i8 %25 to i32
  %27 = icmp ne i32 %26, 35
  br i1 %27, label %28, label %39

28:                                               ; preds = %20
  %29 = load ptr, ptr %4, align 8, !tbaa !5
  %30 = load i32, ptr %7, align 4, !tbaa !9
  %31 = sext i32 %30 to i64
  %32 = getelementptr inbounds i8, ptr %29, i64 %31
  %33 = load i8, ptr %32, align 1, !tbaa !11
  %34 = load ptr, ptr %4, align 8, !tbaa !5
  %35 = load i32, ptr %6, align 4, !tbaa !9
  %36 = add nsw i32 %35, 1
  store i32 %36, ptr %6, align 4, !tbaa !9
  %37 = sext i32 %35 to i64
  %38 = getelementptr inbounds i8, ptr %34, i64 %37
  store i8 %33, ptr %38, align 1, !tbaa !11
  br label %46

39:                                               ; preds = %20
  %40 = load i32, ptr %6, align 4, !tbaa !9
  %41 = icmp sgt i32 %40, 0
  br i1 %41, label %42, label %45

42:                                               ; preds = %39
  %43 = load i32, ptr %6, align 4, !tbaa !9
  %44 = add nsw i32 %43, -1
  store i32 %44, ptr %6, align 4, !tbaa !9
  br label %45

45:                                               ; preds = %42, %39
  br label %46

46:                                               ; preds = %45, %28
  br label %47

47:                                               ; preds = %46
  %48 = load i32, ptr %7, align 4, !tbaa !9
  %49 = add nsw i32 %48, 1
  store i32 %49, ptr %7, align 4, !tbaa !9
  br label %15, !llvm.loop !12

50:                                               ; preds = %19
  %51 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %51, ptr %3, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  br label %52

52:                                               ; preds = %50, %13
  %53 = load i32, ptr %3, align 4
  ret i32 %53
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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: readwrite) uwtable
define dso_local i32 @returnDeleteStrLength(ptr noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp ne ptr %0, null
  %4 = icmp sgt i32 %1, 0
  %or.cond21 = and i1 %3, %4
  br i1 %or.cond21, label %.lr.ph.preheader, label %.loopexit

.lr.ph.preheader:                                 ; preds = %2
  %wide.trip.count = zext nneg i32 %1 to i64
  %xtraiter = and i64 %wide.trip.count, 1
  %5 = icmp eq i32 %1, 1
  br i1 %5, label %.loopexit.loopexit.unr-lcssa, label %.lr.ph.preheader.new

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %unroll_iter = and i64 %wide.trip.count, 2147483646
  br label %.lr.ph

.lr.ph:                                           ; preds = %24, %.lr.ph.preheader.new
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader.new ], [ %indvars.iv.next.1, %24 ]
  %.01519 = phi i32 [ 0, %.lr.ph.preheader.new ], [ %.1.1, %24 ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.1, %24 ]
  %6 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv
  %7 = load i8, ptr %6, align 1, !tbaa !5
  %.not = icmp eq i8 %7, 35
  br i1 %.not, label %12, label %8

8:                                                ; preds = %.lr.ph
  %9 = add nsw i32 %.01519, 1
  %10 = sext i32 %.01519 to i64
  %11 = getelementptr inbounds i8, ptr %0, i64 %10
  store i8 %7, ptr %11, align 1, !tbaa !5
  br label %.lr.ph.1

12:                                               ; preds = %.lr.ph
  %13 = icmp sgt i32 %.01519, 0
  %14 = sext i1 %13 to i32
  %spec.select = add nsw i32 %.01519, %14
  br label %.lr.ph.1

.lr.ph.1:                                         ; preds = %12, %8
  %.1 = phi i32 [ %9, %8 ], [ %spec.select, %12 ]
  %indvars.iv.next = or disjoint i64 %indvars.iv, 1
  %15 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv.next
  %16 = load i8, ptr %15, align 1, !tbaa !5
  %.not.1 = icmp eq i8 %16, 35
  br i1 %.not.1, label %21, label %17

17:                                               ; preds = %.lr.ph.1
  %18 = add nsw i32 %.1, 1
  %19 = sext i32 %.1 to i64
  %20 = getelementptr inbounds i8, ptr %0, i64 %19
  store i8 %16, ptr %20, align 1, !tbaa !5
  br label %24

21:                                               ; preds = %.lr.ph.1
  %22 = icmp sgt i32 %.1, 0
  %23 = sext i1 %22 to i32
  %spec.select.1 = add nsw i32 %.1, %23
  br label %24

24:                                               ; preds = %21, %17
  %.1.1 = phi i32 [ %18, %17 ], [ %spec.select.1, %21 ]
  %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 %.loopexit.loopexit.unr-lcssa, label %.lr.ph, !llvm.loop !8

.loopexit.loopexit.unr-lcssa:                     ; preds = %24, %.lr.ph.preheader
  %.1.lcssa.ph = phi i32 [ poison, %.lr.ph.preheader ], [ %.1.1, %24 ]
  %indvars.iv.unr = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next.1, %24 ]
  %.01519.unr = phi i32 [ 0, %.lr.ph.preheader ], [ %.1.1, %24 ]
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %.loopexit, label %.lr.ph.epil

.lr.ph.epil:                                      ; preds = %.loopexit.loopexit.unr-lcssa
  %25 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv.unr
  %26 = load i8, ptr %25, align 1, !tbaa !5
  %.not.epil = icmp eq i8 %26, 35
  br i1 %.not.epil, label %31, label %27

27:                                               ; preds = %.lr.ph.epil
  %28 = add nsw i32 %.01519.unr, 1
  %29 = sext i32 %.01519.unr to i64
  %30 = getelementptr inbounds i8, ptr %0, i64 %29
  store i8 %26, ptr %30, align 1, !tbaa !5
  br label %.loopexit

31:                                               ; preds = %.lr.ph.epil
  %32 = icmp sgt i32 %.01519.unr, 0
  %33 = sext i1 %32 to i32
  %spec.select.epil = add nsw i32 %.01519.unr, %33
  br label %.loopexit

.loopexit:                                        ; preds = %.loopexit.loopexit.unr-lcssa, %31, %27, %2
  %.016 = phi i32 [ 0, %2 ], [ %.1.lcssa.ph, %.loopexit.loopexit.unr-lcssa ], [ %28, %27 ], [ %spec.select.epil, %31 ]
  ret i32 %.016
}

attributes #0 = { nofree norecurse nosync nounwind memory(argmem: readwrite) 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: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass