; LLVM IR from gost-engine/engine :: gost_gost2015 (init_zero_kdf_seed)

; 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

declare i32 @RAND_bytes(ptr noundef, i32 noundef) #1

; Function Attrs: nounwind uwtable
define dso_local i32 @init_zero_kdf_seed(ptr noundef %0) #2 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  store i32 1, ptr %3, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  store i32 0, ptr %4, align 4, !tbaa !9
  br label %5

5:                                                ; preds = %18, %1
  %6 = load i32, ptr %4, align 4, !tbaa !9
  %7 = icmp slt i32 %6, 8
  br i1 %7, label %8, label %21

8:                                                ; preds = %5
  %9 = load ptr, ptr %2, align 8, !tbaa !5
  %10 = load i32, ptr %4, align 4, !tbaa !9
  %11 = sext i32 %10 to i64
  %12 = getelementptr inbounds i8, ptr %9, i64 %11
  %13 = load i8, ptr %12, align 1, !tbaa !11
  %14 = zext i8 %13 to i32
  %15 = icmp ne i32 %14, 0
  br i1 %15, label %16, label %17

16:                                               ; preds = %8
  store i32 0, ptr %3, align 4, !tbaa !9
  br label %17

17:                                               ; preds = %16, %8
  br label %18

18:                                               ; preds = %17
  %19 = load i32, ptr %4, align 4, !tbaa !9
  %20 = add nsw i32 %19, 1
  store i32 %20, ptr %4, align 4, !tbaa !9
  br label %5, !llvm.loop !12

21:                                               ; preds = %5
  %22 = load i32, ptr %3, align 4, !tbaa !9
  %23 = icmp ne i32 %22, 0
  br i1 %23, label %24, label %27

24:                                               ; preds = %21
  %25 = load ptr, ptr %2, align 8, !tbaa !5
  %26 = call i32 @RAND_bytes(ptr noundef %25, i32 noundef 8)
  br label %28

27:                                               ; preds = %21
  br label %28

28:                                               ; preds = %27, %24
  %29 = phi i32 [ %26, %24 ], [ 1, %27 ]
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  ret i32 %29
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { "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 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 = { 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 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"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"

declare i32 @RAND_bytes(ptr noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local i32 @init_zero_kdf_seed(ptr noundef %0) local_unnamed_addr #1 {
  %2 = load <8 x i8>, ptr %0, align 1, !tbaa !5
  %.fr = freeze <8 x i8> %2
  %.fr.scalar = bitcast <8 x i8> %.fr to i64
  %.not = icmp eq i64 %.fr.scalar, 0
  br i1 %.not, label %3, label %5

3:                                                ; preds = %1
  %4 = tail call i32 @RAND_bytes(ptr noundef nonnull %0, i32 noundef 8) #2
  br label %5

5:                                                ; preds = %1, %3
  %6 = phi i32 [ %4, %3 ], [ 1, %1 ]
  ret i32 %6
}

attributes #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 = { 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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}


; Effective O3 passes: GVNPass,GlobalDCEPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LCSSAPass,LoopRotatePass,SLPVectorizerPass,SROAPass,SimplifyCFGPass,TailCallElimPass