; LLVM IR from square/subzero :: core/trezor-crypto (bignum)

; 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"

%struct.bignum256 = type { [9 x i32] }

; 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 i32 @bn_digitcount(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca %struct.bignum256, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 36, ptr %3) #3
  %7 = load ptr, ptr %2, align 8, !tbaa !5
  call void @llvm.memcpy.p0.p0.i64(ptr align 4 %3, ptr align 4 %7, i64 36, i1 false)
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  store i32 1, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  store i32 0, ptr %5, align 4, !tbaa !9
  br label %8

8:                                                ; preds = %33, %1
  %9 = load i32, ptr %5, align 4, !tbaa !9
  %10 = icmp ult i32 %9, 78
  br i1 %10, label %12, label %11

11:                                               ; preds = %8
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  br label %36

12:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  call void @bn_divmod1000(ptr noundef %3, ptr noundef %6)
  %13 = load i32, ptr %6, align 4, !tbaa !9
  %14 = icmp uge i32 %13, 100
  br i1 %14, label %15, label %18

15:                                               ; preds = %12
  %16 = load i32, ptr %5, align 4, !tbaa !9
  %17 = add i32 %16, 3
  store i32 %17, ptr %4, align 4, !tbaa !9
  br label %32

18:                                               ; preds = %12
  %19 = load i32, ptr %6, align 4, !tbaa !9
  %20 = icmp uge i32 %19, 10
  br i1 %20, label %21, label %24

21:                                               ; preds = %18
  %22 = load i32, ptr %5, align 4, !tbaa !9
  %23 = add i32 %22, 2
  store i32 %23, ptr %4, align 4, !tbaa !9
  br label %31

24:                                               ; preds = %18
  %25 = load i32, ptr %6, align 4, !tbaa !9
  %26 = icmp uge i32 %25, 1
  br i1 %26, label %27, label %30

27:                                               ; preds = %24
  %28 = load i32, ptr %5, align 4, !tbaa !9
  %29 = add i32 %28, 1
  store i32 %29, ptr %4, align 4, !tbaa !9
  br label %30

30:                                               ; preds = %27, %24
  br label %31

31:                                               ; preds = %30, %21
  br label %32

32:                                               ; preds = %31, %15
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  br label %33

33:                                               ; preds = %32
  %34 = load i32, ptr %5, align 4, !tbaa !9
  %35 = add i32 %34, 3
  store i32 %35, ptr %5, align 4, !tbaa !9
  br label %8, !llvm.loop !11

36:                                               ; preds = %11
  %37 = load i32, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 36, ptr %3) #3
  ret i32 %37
}

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #2

; Function Attrs: nounwind uwtable
declare dso_local void @bn_divmod1000(ptr noundef, ptr noundef) #1

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 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { 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 = !{!"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"

%struct.bignum256 = type { [9 x i32] }

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress 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 i32 @bn_digitcount(ptr nocapture noundef readonly %0) local_unnamed_addr #1 {
  %2 = alloca %struct.bignum256, align 4
  %3 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 36, ptr nonnull %2) #3
  call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 4 dereferenceable(36) %2, ptr noundef nonnull align 4 dereferenceable(36) %0, i64 36, i1 false)
  br label %5

4:                                                ; preds = %16
  call void @llvm.lifetime.end.p0(i64 36, ptr nonnull %2) #3
  ret i32 %.1

5:                                                ; preds = %1, %16
  %.09 = phi i32 [ 0, %1 ], [ %17, %16 ]
  %.068 = phi i32 [ 1, %1 ], [ %.1, %16 ]
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %3) #3
  call void @bn_divmod1000(ptr noundef nonnull %2, ptr noundef nonnull %3)
  %6 = load i32, ptr %3, align 4, !tbaa !5
  %7 = icmp ugt i32 %6, 99
  br i1 %7, label %8, label %10

8:                                                ; preds = %5
  %9 = add nuw nsw i32 %.09, 3
  br label %16

10:                                               ; preds = %5
  %11 = icmp ugt i32 %6, 9
  br i1 %11, label %12, label %14

12:                                               ; preds = %10
  %13 = add nuw nsw i32 %.09, 2
  br label %16

14:                                               ; preds = %10
  %.not = icmp eq i32 %6, 0
  %15 = add nuw nsw i32 %.09, 1
  %spec.select = select i1 %.not, i32 %.068, i32 %15
  br label %16

16:                                               ; preds = %14, %12, %8
  %.1 = phi i32 [ %9, %8 ], [ %13, %12 ], [ %spec.select, %14 ]
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %3) #3
  %17 = add nuw nsw i32 %.09, 3
  %18 = icmp ult i32 %.09, 75
  br i1 %18, label %5, label %4, !llvm.loop !9
}

; Function Attrs: mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #2

; Function Attrs: nounwind uwtable
declare dso_local void @bn_divmod1000(ptr noundef, ptr noundef) local_unnamed_addr #1

attributes #0 = { mustprogress 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 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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