; LLVM IR from dynexcoin/Dynex :: src/Common/StringView.ll (ZNK6Common10StringView8findLastERKc)

; 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.Common::StringView" = type { ptr, i64 }

@.str = external hidden unnamed_addr constant [29 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [75 x i8], align 1
@__PRETTY_FUNCTION__._ZNK6Common10StringView8findLastERKc = external hidden unnamed_addr constant [68 x i8], align 1

; Function Attrs: noreturn nounwind
declare void @__assert_fail(ptr noundef, ptr noundef, i32 noundef, ptr noundef) #0

; 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

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_ZNK6Common10StringView8findLastERKc(ptr noundef nonnull align 8 dereferenceable(16) %0, ptr noundef nonnull align 1 dereferenceable(1) %1) #2 align 2 {
  %3 = alloca i64, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i64, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  %8 = load ptr, ptr %4, align 8
  %9 = getelementptr inbounds %"class.Common::StringView", ptr %8, i32 0, i32 0
  %10 = load ptr, ptr %9, align 8, !tbaa !9
  %11 = icmp ne ptr %10, null
  br i1 %11, label %16, label %12

12:                                               ; preds = %2
  %13 = getelementptr inbounds %"class.Common::StringView", ptr %8, i32 0, i32 1
  %14 = load i64, ptr %13, align 8, !tbaa !12
  %15 = icmp eq i64 %14, 0
  br label %16

16:                                               ; preds = %12, %2
  %17 = phi i1 [ true, %2 ], [ %15, %12 ]
  br i1 %17, label %18, label %19

18:                                               ; preds = %16
  br label %21

19:                                               ; preds = %16
  call void @__assert_fail(ptr noundef @.str, ptr noundef @.str.2, i32 noundef 300, ptr noundef @__PRETTY_FUNCTION__._ZNK6Common10StringView8findLastERKc) #3
  unreachable

20:                                               ; No predecessors!
  br label %21

21:                                               ; preds = %20, %18
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #4
  store i64 0, ptr %6, align 8, !tbaa !13
  br label %22

22:                                               ; preds = %50, %21
  %23 = load i64, ptr %6, align 8, !tbaa !13
  %24 = getelementptr inbounds %"class.Common::StringView", ptr %8, i32 0, i32 1
  %25 = load i64, ptr %24, align 8, !tbaa !12
  %26 = icmp ult i64 %23, %25
  br i1 %26, label %28, label %27

27:                                               ; preds = %22
  store i32 2, ptr %7, align 4
  br label %53

28:                                               ; preds = %22
  %29 = getelementptr inbounds %"class.Common::StringView", ptr %8, i32 0, i32 0
  %30 = load ptr, ptr %29, align 8, !tbaa !9
  %31 = getelementptr inbounds %"class.Common::StringView", ptr %8, i32 0, i32 1
  %32 = load i64, ptr %31, align 8, !tbaa !12
  %33 = sub i64 %32, 1
  %34 = load i64, ptr %6, align 8, !tbaa !13
  %35 = sub i64 %33, %34
  %36 = getelementptr inbounds i8, ptr %30, i64 %35
  %37 = load i8, ptr %36, align 1, !tbaa !14
  %38 = sext i8 %37 to i32
  %39 = load ptr, ptr %5, align 8, !tbaa !5
  %40 = load i8, ptr %39, align 1, !tbaa !14
  %41 = sext i8 %40 to i32
  %42 = icmp eq i32 %38, %41
  br i1 %42, label %43, label %49

43:                                               ; preds = %28
  %44 = getelementptr inbounds %"class.Common::StringView", ptr %8, i32 0, i32 1
  %45 = load i64, ptr %44, align 8, !tbaa !12
  %46 = sub i64 %45, 1
  %47 = load i64, ptr %6, align 8, !tbaa !13
  %48 = sub i64 %46, %47
  store i64 %48, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %53

49:                                               ; preds = %28
  br label %50

50:                                               ; preds = %49
  %51 = load i64, ptr %6, align 8, !tbaa !13
  %52 = add i64 %51, 1
  store i64 %52, ptr %6, align 8, !tbaa !13
  br label %22, !llvm.loop !15

53:                                               ; preds = %43, %27
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #4
  %54 = load i32, ptr %7, align 4
  switch i32 %54, label %58 [
    i32 2, label %55
    i32 1, label %56
  ]

55:                                               ; preds = %53
  store i64 -1, ptr %3, align 8
  br label %56

56:                                               ; preds = %55, %53
  %57 = load i64, ptr %3, align 8
  ret i64 %57

58:                                               ; preds = %53
  unreachable
}

attributes #0 = { noreturn nounwind "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 = { 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 #3 = { noreturn nounwind }
attributes #4 = { 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 = !{!10, !6, i64 0}
!10 = !{!"_ZTSN6Common10StringViewE", !6, i64 0, !11, i64 8}
!11 = !{!"long", !7, i64 0}
!12 = !{!10, !11, i64 8}
!13 = !{!11, !11, i64 0}
!14 = !{!7, !7, i64 0}
!15 = distinct !{!15, !16}
!16 = !{!"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"

@.str = external hidden unnamed_addr constant [29 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [75 x i8], align 1
@__PRETTY_FUNCTION__._ZNK6Common10StringView8findLastERKc = external hidden unnamed_addr constant [68 x i8], align 1

; Function Attrs: noreturn nounwind
declare void @__assert_fail(ptr noundef, ptr noundef, i32 noundef, ptr noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_ZNK6Common10StringView8findLastERKc(ptr nocapture noundef nonnull readonly align 8 dereferenceable(16) %0, ptr nocapture noundef nonnull readonly align 1 dereferenceable(1) %1) local_unnamed_addr #1 align 2 {
  %3 = load ptr, ptr %0, align 8, !tbaa !5
  %.not = icmp ne ptr %3, null
  %4 = getelementptr inbounds i8, ptr %0, i64 8
  %5 = load i64, ptr %4, align 8
  %6 = icmp eq i64 %5, 0
  %or.cond = select i1 %.not, i1 true, i1 %6
  br i1 %or.cond, label %.critedge.preheader, label %8

.critedge.preheader:                              ; preds = %2
  br i1 %6, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.critedge.preheader
  %7 = load i8, ptr %1, align 1, !tbaa !11
  br label %10

8:                                                ; preds = %2
  tail call void @__assert_fail(ptr noundef nonnull @.str, ptr noundef nonnull @.str.2, i32 noundef 300, ptr noundef nonnull @__PRETTY_FUNCTION__._ZNK6Common10StringView8findLastERKc) #2
  unreachable

.critedge:                                        ; preds = %10
  %9 = add nuw i64 %.0714, 1
  %exitcond.not = icmp eq i64 %9, %5
  br i1 %exitcond.not, label %._crit_edge, label %10, !llvm.loop !12

10:                                               ; preds = %.lr.ph, %.critedge
  %.0714 = phi i64 [ 0, %.lr.ph ], [ %9, %.critedge ]
  %11 = xor i64 %.0714, -1
  %12 = add i64 %5, %11
  %13 = getelementptr inbounds i8, ptr %3, i64 %12
  %14 = load i8, ptr %13, align 1, !tbaa !11
  %15 = icmp eq i8 %14, %7
  br i1 %15, label %._crit_edge, label %.critedge

._crit_edge:                                      ; preds = %.critedge, %10, %.critedge.preheader
  %spec.select = phi i64 [ -1, %.critedge.preheader ], [ %12, %10 ], [ -1, %.critedge ]
  ret i64 %spec.select
}

attributes #0 = { noreturn nounwind "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 = { noreturn 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, !7, i64 0}
!6 = !{!"_ZTSN6Common10StringViewE", !7, i64 0, !10, i64 8}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"long", !8, i64 0}
!11 = !{!8, !8, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass