; LLVM IR from kojiba/purge :: evasion (rotateBytesEvasion)

; 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
define dso_local void @rotateBytesEvasion(ptr noundef %0, i8 noundef zeroext %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca i8, align 1
  %5 = alloca i8, align 1
  %6 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i8 %1, ptr %4, align 1, !tbaa !9
  %7 = load i8, ptr %4, align 1, !tbaa !9
  %8 = zext i8 %7 to i32
  %9 = srem i32 %8, 64
  %10 = icmp ne i32 %9, 0
  br i1 %10, label %11, label %37

11:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 1, ptr %5) #5
  %12 = load i8, ptr %4, align 1, !tbaa !9
  %13 = zext i8 %12 to i32
  %14 = sub nsw i32 64, %13
  %15 = trunc i32 %14 to i8
  store i8 %15, ptr %5, align 1, !tbaa !9
  %16 = call ptr @llvm.stacksave.p0()
  store ptr %16, ptr %6, align 8
  %17 = alloca i8, i64 64, align 16
  %18 = load ptr, ptr %3, align 8, !tbaa !5
  %19 = load i8, ptr %4, align 1, !tbaa !9
  %20 = zext i8 %19 to i64
  call void @llvm.memcpy.p0.p0.i64(ptr align 16 %17, ptr align 1 %18, i64 %20, i1 false)
  %21 = load ptr, ptr %3, align 8, !tbaa !5
  %22 = load ptr, ptr %3, align 8, !tbaa !5
  %23 = load i8, ptr %4, align 1, !tbaa !9
  %24 = zext i8 %23 to i32
  %25 = sext i32 %24 to i64
  %26 = getelementptr inbounds i8, ptr %22, i64 %25
  %27 = load i8, ptr %5, align 1, !tbaa !9
  %28 = zext i8 %27 to i64
  call void @llvm.memcpy.p0.p0.i64(ptr align 1 %21, ptr align 1 %26, i64 %28, i1 false)
  %29 = load ptr, ptr %3, align 8, !tbaa !5
  %30 = load i8, ptr %5, align 1, !tbaa !9
  %31 = zext i8 %30 to i32
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds i8, ptr %29, i64 %32
  %34 = load i8, ptr %4, align 1, !tbaa !9
  %35 = zext i8 %34 to i64
  call void @llvm.memcpy.p0.p0.i64(ptr align 1 %33, ptr align 16 %17, i64 %35, i1 false)
  call void @llvm.memset.p0.i64(ptr align 16 %17, i8 0, i64 64, i1 false)
  %36 = load ptr, ptr %6, align 8
  call void @llvm.stackrestore.p0(ptr %36)
  call void @llvm.lifetime.end.p0(i64 1, ptr %5) #5
  br label %37

37:                                               ; preds = %11, %2
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind willreturn
declare ptr @llvm.stacksave.p0() #2

; 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) #3

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #4

; Function Attrs: nocallback nofree nosync nounwind willreturn
declare void @llvm.stackrestore.p0(ptr) #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 = { nocallback nofree nosync nounwind willreturn }
attributes #3 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #4 = { nocallback nofree nounwind willreturn memory(argmem: write) }
attributes #5 = { 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 = !{!7, !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"

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn uwtable
define dso_local void @rotateBytesEvasion(ptr nocapture noundef %0, i8 noundef zeroext %1) local_unnamed_addr #0 {
  %3 = and i8 %1, 63
  %.not = icmp eq i8 %3, 0
  br i1 %.not, label %12, label %4

4:                                                ; preds = %2
  %5 = sub i8 64, %1
  %6 = tail call ptr @llvm.stacksave.p0()
  %7 = alloca [64 x i8], align 16
  %8 = zext i8 %1 to i64
  call void @llvm.memcpy.p0.p0.i64(ptr nonnull align 16 %7, ptr align 1 %0, i64 %8, i1 false)
  %9 = getelementptr inbounds i8, ptr %0, i64 %8
  %10 = zext i8 %5 to i64
  tail call void @llvm.memcpy.p0.p0.i64(ptr align 1 %0, ptr align 1 %9, i64 %10, i1 false)
  %11 = getelementptr inbounds i8, ptr %0, i64 %10
  call void @llvm.memcpy.p0.p0.i64(ptr align 1 %11, ptr nonnull align 16 %7, i64 %8, i1 false)
  tail call void @llvm.stackrestore.p0(ptr %6)
  br label %12

12:                                               ; preds = %4, %2
  ret void
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn
declare ptr @llvm.stacksave.p0() #1

; 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: mustprogress nocallback nofree nosync nounwind willreturn
declare void @llvm.stackrestore.p0(ptr) #1

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn 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 #1 = { mustprogress nocallback nofree nosync nounwind willreturn }
attributes #2 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite) }

!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: DSEPass,EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,TailCallElimPass