; LLVM IR from thalium/icebox :: third_party/virtualbox/src/VBox/Devices/EFI/Firmware/MdePkg/Library (SplitStr)

; 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 ptr @SplitStr(ptr noundef %0, i16 noundef zeroext %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i16, align 2
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i16 %1, ptr %5, align 2, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  %9 = load ptr, ptr %4, align 8, !tbaa !5
  %10 = load ptr, ptr %9, align 8, !tbaa !5
  store ptr %10, ptr %6, align 8, !tbaa !5
  %11 = load ptr, ptr %6, align 8, !tbaa !5
  store ptr %11, ptr %7, align 8, !tbaa !5
  %12 = load ptr, ptr %6, align 8, !tbaa !5
  %13 = load i16, ptr %12, align 2, !tbaa !9
  %14 = zext i16 %13 to i32
  %15 = icmp eq i32 %14, 0
  br i1 %15, label %16, label %18

16:                                               ; preds = %2
  %17 = load ptr, ptr %7, align 8, !tbaa !5
  store ptr %17, ptr %3, align 8
  store i32 1, ptr %8, align 4
  br label %51

18:                                               ; preds = %2
  br label %19

19:                                               ; preds = %33, %18
  %20 = load ptr, ptr %6, align 8, !tbaa !5
  %21 = load i16, ptr %20, align 2, !tbaa !9
  %22 = zext i16 %21 to i32
  %23 = icmp eq i32 %22, 0
  %24 = xor i1 %23, true
  br i1 %24, label %25, label %36

25:                                               ; preds = %19
  %26 = load ptr, ptr %6, align 8, !tbaa !5
  %27 = load i16, ptr %26, align 2, !tbaa !9
  %28 = zext i16 %27 to i32
  %29 = load i16, ptr %5, align 2, !tbaa !9
  %30 = zext i16 %29 to i32
  %31 = icmp eq i32 %28, %30
  br i1 %31, label %32, label %33

32:                                               ; preds = %25
  br label %36

33:                                               ; preds = %25
  %34 = load ptr, ptr %6, align 8, !tbaa !5
  %35 = getelementptr inbounds i16, ptr %34, i32 1
  store ptr %35, ptr %6, align 8, !tbaa !5
  br label %19, !llvm.loop !11

36:                                               ; preds = %32, %19
  %37 = load ptr, ptr %6, align 8, !tbaa !5
  %38 = load i16, ptr %37, align 2, !tbaa !9
  %39 = zext i16 %38 to i32
  %40 = load i16, ptr %5, align 2, !tbaa !9
  %41 = zext i16 %40 to i32
  %42 = icmp eq i32 %39, %41
  br i1 %42, label %43, label %47

43:                                               ; preds = %36
  %44 = load ptr, ptr %6, align 8, !tbaa !5
  store i16 0, ptr %44, align 2, !tbaa !9
  %45 = load ptr, ptr %6, align 8, !tbaa !5
  %46 = getelementptr inbounds i16, ptr %45, i32 1
  store ptr %46, ptr %6, align 8, !tbaa !5
  br label %47

47:                                               ; preds = %43, %36
  %48 = load ptr, ptr %6, align 8, !tbaa !5
  %49 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %48, ptr %49, align 8, !tbaa !5
  %50 = load ptr, ptr %7, align 8, !tbaa !5
  store ptr %50, ptr %3, align 8
  store i32 1, ptr %8, align 4
  br label %51

51:                                               ; preds = %47, %16
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  %52 = load ptr, ptr %3, align 8
  ret ptr %52
}

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 = !{!"short", !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 norecurse nosync nounwind memory(readwrite, inaccessiblemem: none) uwtable
define dso_local noundef ptr @SplitStr(ptr nocapture noundef %0, i16 noundef zeroext %1) local_unnamed_addr #0 {
  %3 = load ptr, ptr %0, align 8, !tbaa !5
  %4 = load i16, ptr %3, align 2, !tbaa !9
  %5 = icmp eq i16 %4, 0
  br i1 %5, label %12, label %.preheader

.preheader:                                       ; preds = %2, %.preheader
  %.015 = phi ptr [ %8, %.preheader ], [ %3, %2 ]
  %6 = load i16, ptr %.015, align 2, !tbaa !9
  %.not = icmp eq i16 %6, 0
  %7 = icmp eq i16 %6, %1
  %or.cond = or i1 %.not, %7
  %8 = getelementptr inbounds i8, ptr %.015, i64 2
  br i1 %or.cond, label %9, label %.preheader, !llvm.loop !11

9:                                                ; preds = %.preheader
  br i1 %7, label %10, label %11

10:                                               ; preds = %9
  store i16 0, ptr %.015, align 2, !tbaa !9
  br label %11

11:                                               ; preds = %10, %9
  %.1 = phi ptr [ %8, %10 ], [ %.015, %9 ]
  store ptr %.1, ptr %0, align 8, !tbaa !5
  br label %12

12:                                               ; preds = %2, %11
  ret ptr %3
}

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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"short", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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