; LLVM IR from NOAA-PMEL/Ferret :: fer/ccr (c_strrindex)

; 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 void @c_strrindex_(ptr noundef %0, ptr noundef %1, ptr noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  %9 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store ptr %2, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #3
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  %11 = load ptr, ptr %10, align 8, !tbaa !5
  %12 = icmp eq ptr %11, null
  br i1 %12, label %17, label %13

13:                                               ; preds = %3
  %14 = load ptr, ptr %5, align 8, !tbaa !5
  %15 = load ptr, ptr %14, align 8, !tbaa !5
  %16 = icmp eq ptr %15, null
  br i1 %16, label %17, label %19

17:                                               ; preds = %13, %3
  %18 = load ptr, ptr %6, align 8, !tbaa !5
  store i32 0, ptr %18, align 4, !tbaa !9
  store i32 1, ptr %9, align 4
  br label %51

19:                                               ; preds = %13
  %20 = load ptr, ptr %4, align 8, !tbaa !5
  %21 = load ptr, ptr %20, align 8, !tbaa !5
  %22 = load ptr, ptr %5, align 8, !tbaa !5
  %23 = load ptr, ptr %22, align 8, !tbaa !5
  %24 = call ptr @strstr(ptr noundef %21, ptr noundef %23) #4
  store ptr %24, ptr %7, align 8, !tbaa !5
  %25 = load ptr, ptr %7, align 8, !tbaa !5
  %26 = icmp ne ptr %25, null
  br i1 %26, label %27, label %48

27:                                               ; preds = %19
  br label %28

28:                                               ; preds = %31, %27
  %29 = load ptr, ptr %7, align 8, !tbaa !5
  %30 = icmp ne ptr %29, null
  br i1 %30, label %31, label %38

31:                                               ; preds = %28
  %32 = load ptr, ptr %7, align 8, !tbaa !5
  store ptr %32, ptr %8, align 8, !tbaa !5
  %33 = load ptr, ptr %7, align 8, !tbaa !5
  %34 = getelementptr inbounds i8, ptr %33, i32 1
  store ptr %34, ptr %7, align 8, !tbaa !5
  %35 = load ptr, ptr %5, align 8, !tbaa !5
  %36 = load ptr, ptr %35, align 8, !tbaa !5
  %37 = call ptr @strstr(ptr noundef %34, ptr noundef %36) #4
  store ptr %37, ptr %7, align 8, !tbaa !5
  br label %28, !llvm.loop !11

38:                                               ; preds = %28
  %39 = load ptr, ptr %8, align 8, !tbaa !5
  %40 = load ptr, ptr %4, align 8, !tbaa !5
  %41 = load ptr, ptr %40, align 8, !tbaa !5
  %42 = ptrtoint ptr %39 to i64
  %43 = ptrtoint ptr %41 to i64
  %44 = sub i64 %42, %43
  %45 = add nsw i64 %44, 1
  %46 = trunc i64 %45 to i32
  %47 = load ptr, ptr %6, align 8, !tbaa !5
  store i32 %46, ptr %47, align 4, !tbaa !9
  br label %50

48:                                               ; preds = %19
  %49 = load ptr, ptr %6, align 8, !tbaa !5
  store i32 0, ptr %49, align 4, !tbaa !9
  br label %50

50:                                               ; preds = %48, %38
  store i32 0, ptr %9, align 4
  br label %51

51:                                               ; preds = %50, %17
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  %52 = load i32, ptr %9, align 4
  switch i32 %52, label %54 [
    i32 0, label %53
    i32 1, label %53
  ]

53:                                               ; preds = %51, %51
  ret void

54:                                               ; preds = %51
  unreachable
}

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

; Function Attrs: nounwind willreturn memory(read)
declare ptr @strstr(ptr noundef, ptr noundef) #2

; 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 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 #3 = { nounwind }
attributes #4 = { 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/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"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 nounwind memory(read, argmem: readwrite, inaccessiblemem: none) uwtable
define dso_local void @c_strrindex_(ptr nocapture noundef readonly %0, ptr nocapture noundef readonly %1, ptr nocapture noundef writeonly %2) local_unnamed_addr #0 {
  %4 = load ptr, ptr %0, align 8, !tbaa !5
  %5 = icmp eq ptr %4, null
  br i1 %5, label %19, label %6

6:                                                ; preds = %3
  %7 = load ptr, ptr %1, align 8, !tbaa !5
  %8 = icmp eq ptr %7, null
  br i1 %8, label %19, label %9

9:                                                ; preds = %6
  %10 = tail call ptr @strstr(ptr noundef nonnull dereferenceable(1) %4, ptr noundef nonnull dereferenceable(1) %7) #2
  %.not = icmp eq ptr %10, null
  br i1 %.not, label %19, label %.preheader

.preheader:                                       ; preds = %9, %.preheader
  %.01420 = phi ptr [ %12, %.preheader ], [ %10, %9 ]
  %11 = getelementptr inbounds i8, ptr %.01420, i64 1
  %12 = tail call ptr @strstr(ptr noundef nonnull dereferenceable(1) %11, ptr noundef nonnull dereferenceable(1) %7) #2
  %.not18 = icmp eq ptr %12, null
  br i1 %.not18, label %13, label %.preheader, !llvm.loop !9

13:                                               ; preds = %.preheader
  %14 = ptrtoint ptr %.01420 to i64
  %15 = ptrtoint ptr %4 to i64
  %16 = sub i64 %14, %15
  %17 = trunc i64 %16 to i32
  %18 = add i32 %17, 1
  br label %19

19:                                               ; preds = %13, %9, %3, %6
  %storemerge19 = phi i32 [ 0, %6 ], [ 0, %3 ], [ %18, %13 ], [ 0, %9 ]
  store i32 %storemerge19, ptr %2, align 4, !tbaa !11
  ret void
}

; Function Attrs: mustprogress nofree nounwind willreturn memory(argmem: read)
declare ptr @strstr(ptr noundef, ptr nocapture noundef) local_unnamed_addr #1

attributes #0 = { nofree nounwind memory(read, argmem: 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" }
attributes #1 = { 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 #2 = { 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/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!12, !12, i64 0}
!12 = !{!"int", !7, i64 0}


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