; LLVM IR from gost-engine/engine :: gost89 (gost_dec)

; 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 @gostdecrypt(ptr noundef, ptr noundef, ptr noundef) #1

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

10:                                               ; preds = %22, %4
  %11 = load i32, ptr %9, align 4, !tbaa !9
  %12 = load i32, ptr %8, align 4, !tbaa !9
  %13 = icmp slt i32 %11, %12
  br i1 %13, label %14, label %25

14:                                               ; preds = %10
  %15 = load ptr, ptr %5, align 8, !tbaa !5
  %16 = load ptr, ptr %6, align 8, !tbaa !5
  %17 = load ptr, ptr %7, align 8, !tbaa !5
  call void @gostdecrypt(ptr noundef %15, ptr noundef %16, ptr noundef %17)
  %18 = load ptr, ptr %7, align 8, !tbaa !5
  %19 = getelementptr inbounds i8, ptr %18, i64 8
  store ptr %19, ptr %7, align 8, !tbaa !5
  %20 = load ptr, ptr %6, align 8, !tbaa !5
  %21 = getelementptr inbounds i8, ptr %20, i64 8
  store ptr %21, ptr %6, align 8, !tbaa !5
  br label %22

22:                                               ; preds = %14
  %23 = load i32, ptr %9, align 4, !tbaa !9
  %24 = add nsw i32 %23, 1
  store i32 %24, ptr %9, align 4, !tbaa !9
  br label %10, !llvm.loop !11

25:                                               ; preds = %10
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #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 = 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"

; Function Attrs: nounwind uwtable
declare dso_local void @gostdecrypt(ptr noundef, ptr noundef, ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @gost_dec(ptr noundef %0, ptr noundef %1, ptr noundef %2, i32 noundef %3) local_unnamed_addr #0 {
  %5 = icmp sgt i32 %3, 0
  br i1 %5, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %4, %.lr.ph
  %.011 = phi i32 [ %8, %.lr.ph ], [ 0, %4 ]
  %.0710 = phi ptr [ %7, %.lr.ph ], [ %1, %4 ]
  %.089 = phi ptr [ %6, %.lr.ph ], [ %2, %4 ]
  tail call void @gostdecrypt(ptr noundef %0, ptr noundef %.0710, ptr noundef %.089)
  %6 = getelementptr inbounds i8, ptr %.089, i64 8
  %7 = getelementptr inbounds i8, ptr %.0710, i64 8
  %8 = add nuw nsw i32 %.011, 1
  %exitcond.not = icmp eq i32 %8, %3
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !5

._crit_edge:                                      ; preds = %.lr.ph, %4
  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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass