; LLVM IR from square/subzero :: core/external-crypto/aes (aesaux)

; 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 @df_string(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  %6 = load ptr, ptr %2, align 8, !tbaa !5
  store ptr %6, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  store ptr null, ptr %5, align 8, !tbaa !5
  store ptr null, ptr %4, align 8, !tbaa !5
  br label %7

7:                                                ; preds = %20, %1
  %8 = load ptr, ptr %3, align 8, !tbaa !5
  %9 = load i8, ptr %8, align 1, !tbaa !9
  %10 = icmp ne i8 %9, 0
  br i1 %10, label %11, label %21

11:                                               ; preds = %7
  %12 = load ptr, ptr %3, align 8, !tbaa !5
  %13 = getelementptr inbounds i8, ptr %12, i32 1
  store ptr %13, ptr %3, align 8, !tbaa !5
  %14 = load i8, ptr %12, align 1, !tbaa !9
  %15 = sext i8 %14 to i32
  %16 = icmp eq i32 %15, 92
  br i1 %16, label %17, label %20

17:                                               ; preds = %11
  %18 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %18, ptr %4, align 8, !tbaa !5
  %19 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %19, ptr %5, align 8, !tbaa !5
  br label %20

20:                                               ; preds = %17, %11
  br label %7, !llvm.loop !10

21:                                               ; preds = %7
  %22 = load ptr, ptr %4, align 8, !tbaa !5
  %23 = icmp ne ptr %22, null
  br i1 %23, label %24, label %26

24:                                               ; preds = %21
  %25 = load ptr, ptr %4, align 8, !tbaa !5
  br label %35

26:                                               ; preds = %21
  %27 = load ptr, ptr %5, align 8, !tbaa !5
  %28 = icmp ne ptr %27, null
  br i1 %28, label %29, label %31

29:                                               ; preds = %26
  %30 = load ptr, ptr %5, align 8, !tbaa !5
  br label %33

31:                                               ; preds = %26
  %32 = load ptr, ptr %2, align 8, !tbaa !5
  br label %33

33:                                               ; preds = %31, %29
  %34 = phi ptr [ %30, %29 ], [ %32, %31 ]
  br label %35

35:                                               ; preds = %33, %24
  %36 = phi ptr [ %25, %24 ], [ %34, %33 ]
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret ptr %36
}

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 = !{!7, !7, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"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(read, inaccessiblemem: none) uwtable
define dso_local ptr @df_string(ptr noundef readonly %0) local_unnamed_addr #0 {
  %2 = load i8, ptr %0, align 1, !tbaa !5
  %.not17 = icmp eq i8 %2, 0
  br i1 %.not17, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1, %.lr.ph
  %3 = phi i8 [ %6, %.lr.ph ], [ %2, %1 ]
  %.020 = phi ptr [ %spec.select16, %.lr.ph ], [ null, %1 ]
  %.01019 = phi ptr [ %spec.select, %.lr.ph ], [ null, %1 ]
  %.01218 = phi ptr [ %4, %.lr.ph ], [ %0, %1 ]
  %4 = getelementptr inbounds i8, ptr %.01218, i64 1
  %5 = icmp eq i8 %3, 92
  %spec.select = select i1 %5, ptr %.020, ptr %.01019
  %spec.select16 = select i1 %5, ptr %4, ptr %.020
  %6 = load i8, ptr %4, align 1, !tbaa !5
  %.not = icmp eq i8 %6, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !8

._crit_edge:                                      ; preds = %.lr.ph, %1
  %.010.lcssa = phi ptr [ null, %1 ], [ %spec.select, %.lr.ph ]
  %.0.lcssa = phi ptr [ null, %1 ], [ %spec.select16, %.lr.ph ]
  %.not14 = icmp eq ptr %.010.lcssa, null
  %.not15 = icmp eq ptr %.0.lcssa, null
  %7 = select i1 %.not15, ptr %0, ptr %.0.lcssa
  %8 = select i1 %.not14, ptr %7, ptr %.010.lcssa
  ret ptr %8
}

attributes #0 = { nofree norecurse nosync nounwind memory(read, 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,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass