; LLVM IR from JayXon/Leanify :: utils.ll (Z11ShrinkSpaceB5cxx11PKc)

; 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"

%"class.std::__cxx11::basic_string" = type { %"struct.std::__cxx11::basic_string<char>::_Alloc_hider", i64, %union.anon }
%"struct.std::__cxx11::basic_string<char>::_Alloc_hider" = type { ptr }
%union.anon = type { i64, [8 x i8] }

; Function Attrs: mustprogress uwtable
define dso_local void @_Z11ShrinkSpaceB5cxx11PKc(ptr dead_on_unwind noalias writable sret(%"class.std::__cxx11::basic_string") align 8 %0, ptr noundef %1) #0 personality ptr @__gxx_personality_v0 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i1, align 1
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %3, align 8
  store ptr %1, ptr %4, align 8, !tbaa !5
  store i1 false, ptr %5, align 1
  call void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEC2Ev(ptr noundef nonnull align 8 dereferenceable(32) %0) #2
  br label %8

8:                                                ; preds = %69, %2
  %9 = load ptr, ptr %4, align 8, !tbaa !5
  %10 = load i8, ptr %9, align 1, !tbaa !9
  %11 = icmp ne i8 %10, 0
  br i1 %11, label %12, label %70

12:                                               ; preds = %8
  %13 = load ptr, ptr %4, align 8, !tbaa !5
  %14 = load i8, ptr %13, align 1, !tbaa !9
  %15 = sext i8 %14 to i32
  %16 = icmp eq i32 %15, 32
  br i1 %16, label %27, label %17

17:                                               ; preds = %12
  %18 = load ptr, ptr %4, align 8, !tbaa !5
  %19 = load i8, ptr %18, align 1, !tbaa !9
  %20 = sext i8 %19 to i32
  %21 = icmp eq i32 %20, 10
  br i1 %21, label %27, label %22

22:                                               ; preds = %17
  %23 = load ptr, ptr %4, align 8, !tbaa !5
  %24 = load i8, ptr %23, align 1, !tbaa !9
  %25 = sext i8 %24 to i32
  %26 = icmp eq i32 %25, 9
  br i1 %26, label %27, label %64

27:                                               ; preds = %22, %17, %12
  br label %28

28:                                               ; preds = %46, %27
  %29 = load ptr, ptr %4, align 8, !tbaa !5
  %30 = getelementptr inbounds i8, ptr %29, i32 1
  store ptr %30, ptr %4, align 8, !tbaa !5
  br label %31

31:                                               ; preds = %28
  %32 = load ptr, ptr %4, align 8, !tbaa !5
  %33 = load i8, ptr %32, align 1, !tbaa !9
  %34 = sext i8 %33 to i32
  %35 = icmp eq i32 %34, 32
  br i1 %35, label %46, label %36

36:                                               ; preds = %31
  %37 = load ptr, ptr %4, align 8, !tbaa !5
  %38 = load i8, ptr %37, align 1, !tbaa !9
  %39 = sext i8 %38 to i32
  %40 = icmp eq i32 %39, 10
  br i1 %40, label %46, label %41

41:                                               ; preds = %36
  %42 = load ptr, ptr %4, align 8, !tbaa !5
  %43 = load i8, ptr %42, align 1, !tbaa !9
  %44 = sext i8 %43 to i32
  %45 = icmp eq i32 %44, 9
  br label %46

46:                                               ; preds = %41, %36, %31
  %47 = phi i1 [ true, %36 ], [ true, %31 ], [ %45, %41 ]
  br i1 %47, label %28, label %48, !llvm.loop !10

48:                                               ; preds = %46
  %49 = load ptr, ptr %4, align 8, !tbaa !5
  %50 = load i8, ptr %49, align 1, !tbaa !9
  %51 = sext i8 %50 to i32
  %52 = icmp eq i32 %51, 0
  br i1 %52, label %53, label %54

53:                                               ; preds = %48
  br label %70

54:                                               ; preds = %48
  %55 = call noundef zeroext i1 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(32) %0) #2
  br i1 %55, label %63, label %56

56:                                               ; preds = %54
  %57 = invoke noundef nonnull align 8 dereferenceable(32) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEpLEc(ptr noundef nonnull align 8 dereferenceable(32) %0, i8 noundef signext 32)
          to label %58 unwind label %59

58:                                               ; preds = %56
  br label %63

59:                                               ; preds = %64, %56
  %60 = landingpad { ptr, i32 }
          cleanup
  %61 = extractvalue { ptr, i32 } %60, 0
  store ptr %61, ptr %6, align 8
  %62 = extractvalue { ptr, i32 } %60, 1
  store i32 %62, ptr %7, align 4
  call void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED2Ev(ptr noundef nonnull align 8 dereferenceable(32) %0) #2
  br label %74

63:                                               ; preds = %58, %54
  br label %64

64:                                               ; preds = %63, %22
  %65 = load ptr, ptr %4, align 8, !tbaa !5
  %66 = getelementptr inbounds i8, ptr %65, i32 1
  store ptr %66, ptr %4, align 8, !tbaa !5
  %67 = load i8, ptr %65, align 1, !tbaa !9
  %68 = invoke noundef nonnull align 8 dereferenceable(32) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEpLEc(ptr noundef nonnull align 8 dereferenceable(32) %0, i8 noundef signext %67)
          to label %69 unwind label %59

69:                                               ; preds = %64
  br label %8, !llvm.loop !12

70:                                               ; preds = %53, %8
  store i1 true, ptr %5, align 1
  %71 = load i1, ptr %5, align 1
  br i1 %71, label %73, label %72

72:                                               ; preds = %70
  call void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED2Ev(ptr noundef nonnull align 8 dereferenceable(32) %0) #2
  br label %73

73:                                               ; preds = %72, %70
  ret void

74:                                               ; preds = %59
  %75 = load ptr, ptr %6, align 8
  %76 = load i32, ptr %7, align 4
  %77 = insertvalue { ptr, i32 } poison, ptr %75, 0
  %78 = insertvalue { ptr, i32 } %77, i32 %76, 1
  resume { ptr, i32 } %78
}

; Function Attrs: mustprogress nounwind uwtable
declare void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEC2Ev(ptr noundef nonnull align 8 dereferenceable(32)) unnamed_addr #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare noundef zeroext i1 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(32)) #1 align 2

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(32) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEpLEc(ptr noundef nonnull align 8 dereferenceable(32), i8 noundef signext) #0 align 2

declare i32 @__gxx_personality_v0(...)

; Function Attrs: mustprogress nounwind uwtable
declare void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED2Ev(ptr noundef nonnull align 8 dereferenceable(32)) unnamed_addr #1 align 2

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


; 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"

%"class.std::__cxx11::basic_string" = type { %"struct.std::__cxx11::basic_string<char>::_Alloc_hider", i64, %union.anon }
%"struct.std::__cxx11::basic_string<char>::_Alloc_hider" = type { ptr }
%union.anon = type { i64, [8 x i8] }

; Function Attrs: mustprogress uwtable
define dso_local void @_Z11ShrinkSpaceB5cxx11PKc(ptr dead_on_unwind noalias nonnull writable sret(%"class.std::__cxx11::basic_string") align 8 %0, ptr nocapture noundef readonly %1) local_unnamed_addr #0 personality ptr @__gxx_personality_v0 {
  tail call void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEC2Ev(ptr noundef nonnull align 8 dereferenceable(32) %0) #2
  br label %3

3:                                                ; preds = %13, %2
  %.0 = phi ptr [ %1, %2 ], [ %14, %13 ]
  %4 = load i8, ptr %.0, align 1, !tbaa !5
  switch i8 %4, label %13 [
    i8 0, label %.loopexit
    i8 32, label %.backedge.preheader
    i8 10, label %.backedge.preheader
    i8 9, label %.backedge.preheader
  ]

.backedge.preheader:                              ; preds = %3, %3, %3
  br label %.backedge

.backedge:                                        ; preds = %.backedge.backedge, %.backedge.preheader
  %.1 = phi ptr [ %.0, %.backedge.preheader ], [ %5, %.backedge.backedge ]
  %5 = getelementptr inbounds i8, ptr %.1, i64 1
  %6 = load i8, ptr %5, align 1, !tbaa !5
  switch i8 %6, label %7 [
    i8 32, label %.backedge.backedge
    i8 10, label %.backedge.backedge
    i8 9, label %.backedge.backedge
    i8 0, label %.loopexit
  ]

.backedge.backedge:                               ; preds = %.backedge, %.backedge, %.backedge
  br label %.backedge

7:                                                ; preds = %.backedge
  %8 = tail call noundef zeroext i1 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(32) %0) #2
  br i1 %8, label %13, label %9

9:                                                ; preds = %7
  %10 = invoke noundef nonnull align 8 dereferenceable(32) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEpLEc(ptr noundef nonnull align 8 dereferenceable(32) %0, i8 noundef signext 32)
          to label %13 unwind label %11

11:                                               ; preds = %13, %9
  %12 = landingpad { ptr, i32 }
          cleanup
  tail call void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED2Ev(ptr noundef nonnull align 8 dereferenceable(32) %0) #2
  resume { ptr, i32 } %12

13:                                               ; preds = %3, %7, %9
  %.2 = phi ptr [ %5, %7 ], [ %5, %9 ], [ %.0, %3 ]
  %14 = getelementptr inbounds i8, ptr %.2, i64 1
  %15 = load i8, ptr %.2, align 1, !tbaa !5
  %16 = invoke noundef nonnull align 8 dereferenceable(32) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEpLEc(ptr noundef nonnull align 8 dereferenceable(32) %0, i8 noundef signext %15)
          to label %3 unwind label %11, !llvm.loop !8

.loopexit:                                        ; preds = %3, %.backedge
  ret void
}

; Function Attrs: mustprogress nounwind uwtable
declare void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEC2Ev(ptr noundef nonnull align 8 dereferenceable(32)) unnamed_addr #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare noundef zeroext i1 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(32)) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(32) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEpLEc(ptr noundef nonnull align 8 dereferenceable(32), i8 noundef signext) local_unnamed_addr #0 align 2

declare i32 @__gxx_personality_v0(...)

; Function Attrs: mustprogress nounwind uwtable
declare void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED2Ev(ptr noundef nonnull align 8 dereferenceable(32)) unnamed_addr #1 align 2

attributes #0 = { mustprogress 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 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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass