; LLVM IR from stamparm/cryptospecs :: symmetrical/sources (gost)

; 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
declare dso_local void @gostcrypt(ptr noundef, ptr noundef, ptr noundef) #1

; Function Attrs: nounwind uwtable
define dso_local void @gostcfbdecrypt(ptr noundef %0, ptr noundef %1, i32 noundef %2, ptr noundef %3, ptr noundef %4) #1 {
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca i32, align 4
  %9 = alloca ptr, align 8
  %10 = alloca ptr, align 8
  %11 = alloca i64, align 8
  store ptr %0, ptr %6, align 8, !tbaa !5
  store ptr %1, ptr %7, align 8, !tbaa !5
  store i32 %2, ptr %8, align 4, !tbaa !9
  store ptr %3, ptr %9, align 8, !tbaa !5
  store ptr %4, ptr %10, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %11) #2
  br label %12

12:                                               ; preds = %16, %5
  %13 = load i32, ptr %8, align 4, !tbaa !9
  %14 = add nsw i32 %13, -1
  store i32 %14, ptr %8, align 4, !tbaa !9
  %15 = icmp ne i32 %13, 0
  br i1 %15, label %16, label %44

16:                                               ; preds = %12
  %17 = load ptr, ptr %9, align 8, !tbaa !5
  %18 = load ptr, ptr %9, align 8, !tbaa !5
  %19 = load ptr, ptr %10, align 8, !tbaa !5
  call void @gostcrypt(ptr noundef %17, ptr noundef %18, ptr noundef %19)
  %20 = load ptr, ptr %7, align 8, !tbaa !5
  %21 = load i64, ptr %20, align 8, !tbaa !11
  store i64 %21, ptr %11, align 8, !tbaa !11
  %22 = load ptr, ptr %9, align 8, !tbaa !5
  %23 = getelementptr inbounds i64, ptr %22, i64 0
  %24 = load i64, ptr %23, align 8, !tbaa !11
  %25 = load ptr, ptr %7, align 8, !tbaa !5
  %26 = getelementptr inbounds i64, ptr %25, i32 1
  store ptr %26, ptr %7, align 8, !tbaa !5
  %27 = load i64, ptr %25, align 8, !tbaa !11
  %28 = xor i64 %27, %24
  store i64 %28, ptr %25, align 8, !tbaa !11
  %29 = load i64, ptr %11, align 8, !tbaa !11
  %30 = load ptr, ptr %9, align 8, !tbaa !5
  %31 = getelementptr inbounds i64, ptr %30, i64 0
  store i64 %29, ptr %31, align 8, !tbaa !11
  %32 = load ptr, ptr %7, align 8, !tbaa !5
  %33 = load i64, ptr %32, align 8, !tbaa !11
  store i64 %33, ptr %11, align 8, !tbaa !11
  %34 = load ptr, ptr %9, align 8, !tbaa !5
  %35 = getelementptr inbounds i64, ptr %34, i64 1
  %36 = load i64, ptr %35, align 8, !tbaa !11
  %37 = load ptr, ptr %7, align 8, !tbaa !5
  %38 = getelementptr inbounds i64, ptr %37, i32 1
  store ptr %38, ptr %7, align 8, !tbaa !5
  %39 = load i64, ptr %37, align 8, !tbaa !11
  %40 = xor i64 %39, %36
  store i64 %40, ptr %37, align 8, !tbaa !11
  %41 = load i64, ptr %11, align 8, !tbaa !11
  %42 = load ptr, ptr %9, align 8, !tbaa !5
  %43 = getelementptr inbounds i64, ptr %42, i64 1
  store i64 %41, ptr %43, align 8, !tbaa !11
  br label %12, !llvm.loop !13

44:                                               ; preds = %12
  call void @llvm.lifetime.end.p0(i64 8, ptr %11) #2
  ret void
}

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 = !{!"int", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"long", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"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: nounwind uwtable
declare dso_local void @gostcrypt(ptr noundef, ptr noundef, ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @gostcfbdecrypt(ptr nocapture noundef readnone %0, ptr nocapture noundef %1, i32 noundef %2, ptr noundef %3, ptr noundef %4) local_unnamed_addr #0 {
  %.not14 = icmp eq i32 %2, 0
  br i1 %.not14, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %5
  %6 = getelementptr inbounds i8, ptr %3, i64 8
  br label %7

7:                                                ; preds = %.lr.ph, %7
  %.016 = phi ptr [ %1, %.lr.ph ], [ %15, %7 ]
  %.01315 = phi i32 [ %2, %.lr.ph ], [ %8, %7 ]
  %8 = add nsw i32 %.01315, -1
  tail call void @gostcrypt(ptr noundef %3, ptr noundef %3, ptr noundef %4)
  %9 = load i64, ptr %.016, align 8, !tbaa !5
  %10 = load i64, ptr %3, align 8, !tbaa !5
  %11 = getelementptr inbounds i8, ptr %.016, i64 8
  %12 = xor i64 %10, %9
  store i64 %12, ptr %.016, align 8, !tbaa !5
  store i64 %9, ptr %3, align 8, !tbaa !5
  %13 = load i64, ptr %11, align 8, !tbaa !5
  %14 = load i64, ptr %6, align 8, !tbaa !5
  %15 = getelementptr inbounds i8, ptr %.016, i64 16
  %16 = xor i64 %14, %13
  store i64 %16, ptr %11, align 8, !tbaa !5
  store i64 %13, ptr %6, align 8, !tbaa !5
  %.not = icmp eq i32 %8, 0
  br i1 %.not, label %._crit_edge, label %7, !llvm.loop !9

._crit_edge:                                      ; preds = %7, %5
  ret void
}

attributes #0 = { 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" }

!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 = !{!"long", !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,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass