; LLVM IR from tleonhardt/practical_cryptography_engineering :: mbedtls (ctr_drbg)

; 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"

@.str = external hidden unnamed_addr constant [3 x i8], align 1

; 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
declare dso_local i32 @mbedtls_ctr_drbg_random(ptr noundef, ptr noundef, i64 noundef) #1

; Function Attrs: nounwind uwtable
define dso_local i32 @mbedtls_ctr_drbg_write_seed_file(ptr noundef %0, ptr noundef %1) #1 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  %8 = alloca [256 x i8], align 16
  %9 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  store i32 -58, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #3
  call void @llvm.lifetime.start.p0(i64 256, ptr %8) #3
  %10 = load ptr, ptr %5, align 8, !tbaa !5
  %11 = call noalias ptr @fopen(ptr noundef %10, ptr noundef @.str)
  store ptr %11, ptr %7, align 8, !tbaa !5
  %12 = icmp eq ptr %11, null
  br i1 %12, label %13, label %14

13:                                               ; preds = %2
  store i32 -58, ptr %3, align 4
  store i32 1, ptr %9, align 4
  br label %31

14:                                               ; preds = %2
  %15 = load ptr, ptr %4, align 8, !tbaa !5
  %16 = getelementptr inbounds [256 x i8], ptr %8, i64 0, i64 0
  %17 = call i32 @mbedtls_ctr_drbg_random(ptr noundef %15, ptr noundef %16, i64 noundef 256)
  store i32 %17, ptr %6, align 4, !tbaa !9
  %18 = icmp ne i32 %17, 0
  br i1 %18, label %19, label %20

19:                                               ; preds = %14
  br label %27

20:                                               ; preds = %14
  %21 = getelementptr inbounds [256 x i8], ptr %8, i64 0, i64 0
  %22 = load ptr, ptr %7, align 8, !tbaa !5
  %23 = call i64 @fwrite(ptr noundef %21, i64 noundef 1, i64 noundef 256, ptr noundef %22)
  %24 = icmp ne i64 %23, 256
  br i1 %24, label %25, label %26

25:                                               ; preds = %20
  store i32 -58, ptr %6, align 4, !tbaa !9
  br label %27

26:                                               ; preds = %20
  store i32 0, ptr %6, align 4, !tbaa !9
  br label %27

27:                                               ; preds = %26, %25, %19
  %28 = load ptr, ptr %7, align 8, !tbaa !5
  %29 = call i32 @fclose(ptr noundef %28)
  %30 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %30, ptr %3, align 4
  store i32 1, ptr %9, align 4
  br label %31

31:                                               ; preds = %27, %13
  call void @llvm.lifetime.end.p0(i64 256, ptr %8) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  %32 = load i32, ptr %3, align 4
  ret i32 %32
}

declare noalias ptr @fopen(ptr noundef, ptr noundef) #2

declare i64 @fwrite(ptr noundef, i64 noundef, i64 noundef, ptr noundef) #2

declare i32 @fclose(ptr noundef) #2

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 = { "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}


; 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"

@.str = external hidden unnamed_addr constant [3 x i8], align 1

; 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
declare dso_local i32 @mbedtls_ctr_drbg_random(ptr noundef, ptr noundef, i64 noundef) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
define dso_local i32 @mbedtls_ctr_drbg_write_seed_file(ptr noundef %0, ptr nocapture noundef readonly %1) local_unnamed_addr #1 {
  %3 = alloca [256 x i8], align 16
  call void @llvm.lifetime.start.p0(i64 256, ptr nonnull %3) #3
  %4 = tail call noalias ptr @fopen(ptr noundef %1, ptr noundef nonnull @.str)
  %5 = icmp eq ptr %4, null
  br i1 %5, label %12, label %6

6:                                                ; preds = %2
  %7 = call i32 @mbedtls_ctr_drbg_random(ptr noundef %0, ptr noundef nonnull %3, i64 noundef 256)
  %.not = icmp eq i32 %7, 0
  br i1 %.not, label %8, label %10

8:                                                ; preds = %6
  %9 = call i64 @fwrite(ptr noundef nonnull %3, i64 noundef 1, i64 noundef 256, ptr noundef nonnull %4)
  %.not8 = icmp eq i64 %9, 256
  %. = select i1 %.not8, i32 0, i32 -58
  br label %10

10:                                               ; preds = %8, %6
  %.05 = phi i32 [ %7, %6 ], [ %., %8 ]
  %11 = call i32 @fclose(ptr noundef nonnull %4)
  br label %12

12:                                               ; preds = %2, %10
  %.0 = phi i32 [ %.05, %10 ], [ -58, %2 ]
  call void @llvm.lifetime.end.p0(i64 256, ptr nonnull %3) #3
  ret i32 %.0
}

; Function Attrs: nofree nounwind
declare noalias noundef ptr @fopen(ptr nocapture noundef readonly, ptr nocapture noundef readonly) local_unnamed_addr #2

; Function Attrs: nofree nounwind
declare noundef i64 @fwrite(ptr nocapture noundef, i64 noundef, i64 noundef, ptr nocapture noundef) local_unnamed_addr #2

; Function Attrs: nofree nounwind
declare noundef i32 @fclose(ptr nocapture noundef) local_unnamed_addr #2

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 = { nofree nounwind "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)"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass