; LLVM IR from DimitrisJim/leetcode_solutions :: C/Algorithms (1844)

; 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 ptr @replaceDigits(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  %5 = load ptr, ptr %2, align 8, !tbaa !5
  store ptr %5, ptr %3, align 8, !tbaa !5
  br label %6

6:                                                ; preds = %19, %1
  %7 = load ptr, ptr %2, align 8, !tbaa !5
  %8 = load i8, ptr %7, align 1, !tbaa !9
  %9 = sext i8 %8 to i32
  %10 = icmp ne i32 %9, 0
  br i1 %10, label %11, label %17

11:                                               ; preds = %6
  %12 = load ptr, ptr %2, align 8, !tbaa !5
  %13 = getelementptr inbounds i8, ptr %12, i64 1
  %14 = load i8, ptr %13, align 1, !tbaa !9
  %15 = sext i8 %14 to i32
  %16 = icmp ne i32 %15, 0
  br label %17

17:                                               ; preds = %11, %6
  %18 = phi i1 [ false, %6 ], [ %16, %11 ]
  br i1 %18, label %19, label %34

19:                                               ; preds = %17
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  %20 = load ptr, ptr %2, align 8, !tbaa !5
  %21 = getelementptr inbounds i8, ptr %20, i32 1
  store ptr %21, ptr %2, align 8, !tbaa !5
  %22 = load i8, ptr %20, align 1, !tbaa !9
  %23 = sext i8 %22 to i32
  store i32 %23, ptr %4, align 4, !tbaa !10
  %24 = load i32, ptr %4, align 4, !tbaa !10
  %25 = load ptr, ptr %2, align 8, !tbaa !5
  %26 = load i8, ptr %25, align 1, !tbaa !9
  %27 = sext i8 %26 to i32
  %28 = sub nsw i32 %27, 48
  %29 = add nsw i32 %24, %28
  %30 = trunc i32 %29 to i8
  %31 = load ptr, ptr %2, align 8, !tbaa !5
  store i8 %30, ptr %31, align 1, !tbaa !9
  %32 = load ptr, ptr %2, align 8, !tbaa !5
  %33 = getelementptr inbounds i8, ptr %32, i32 1
  store ptr %33, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  br label %6, !llvm.loop !12

34:                                               ; preds = %17
  %35 = load ptr, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret ptr %35
}

; 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 = !{!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(readwrite, inaccessiblemem: none) uwtable
define dso_local noundef ptr @replaceDigits(ptr noundef returned %0) local_unnamed_addr #0 {
  %2 = load i8, ptr %0, align 1, !tbaa !5
  %.not11 = icmp eq i8 %2, 0
  br i1 %.not11, label %.critedge, label %.lr.ph

.lr.ph:                                           ; preds = %1, %6
  %3 = phi i8 [ %10, %6 ], [ %2, %1 ]
  %.012 = phi ptr [ %9, %6 ], [ %0, %1 ]
  %4 = getelementptr inbounds i8, ptr %.012, i64 1
  %5 = load i8, ptr %4, align 1, !tbaa !5
  %.not10 = icmp eq i8 %5, 0
  br i1 %.not10, label %.critedge, label %6

6:                                                ; preds = %.lr.ph
  %7 = add i8 %3, -48
  %8 = add i8 %7, %5
  store i8 %8, ptr %4, align 1, !tbaa !5
  %9 = getelementptr inbounds i8, ptr %.012, i64 2
  %10 = load i8, ptr %9, align 1, !tbaa !5
  %.not = icmp eq i8 %10, 0
  br i1 %.not, label %.critedge, label %.lr.ph, !llvm.loop !8

.critedge:                                        ; preds = %.lr.ph, %6, %1
  ret ptr %0
}

attributes #0 = { nofree norecurse nosync nounwind memory(readwrite, 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" }

!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,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass