; LLVM IR from specinfo-ua/UAPKI :: library/uapkic/src (byte-utils-internal)

; 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 @secure_zero(ptr noundef %0, i64 noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca i64, align 8
  %5 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i64 %1, ptr %4, align 8, !tbaa !9
  %6 = load ptr, ptr %3, align 8, !tbaa !5
  %7 = icmp eq ptr %6, null
  br i1 %7, label %8, label %9

8:                                                ; preds = %2
  br label %19

9:                                                ; preds = %2
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  %10 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %10, ptr %5, align 8, !tbaa !5
  br label %11

11:                                               ; preds = %15, %9
  %12 = load i64, ptr %4, align 8, !tbaa !9
  %13 = add i64 %12, -1
  store i64 %13, ptr %4, align 8, !tbaa !9
  %14 = icmp ne i64 %12, 0
  br i1 %14, label %15, label %18

15:                                               ; preds = %11
  %16 = load ptr, ptr %5, align 8, !tbaa !5
  %17 = getelementptr inbounds i8, ptr %16, i32 1
  store ptr %17, ptr %5, align 8, !tbaa !5
  store volatile i8 0, ptr %16, align 1, !tbaa !11
  br label %11, !llvm.loop !12

18:                                               ; preds = %11
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  br label %19

19:                                               ; preds = %18, %8
  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 = !{!"long", !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"

; Function Attrs: nofree norecurse nounwind uwtable
define dso_local void @secure_zero(ptr noundef %0, i64 noundef %1) local_unnamed_addr #0 {
  %3 = icmp eq ptr %0, null
  %.not5 = icmp eq i64 %1, 0
  %or.cond = or i1 %3, %.not5
  br i1 %or.cond, label %.loopexit, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %2
  %4 = add i64 %1, -1
  %xtraiter = and i64 %1, 7
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %.lr.ph.prol.loopexit, label %.lr.ph.prol

.lr.ph.prol:                                      ; preds = %.lr.ph.preheader, %.lr.ph.prol
  %.07.prol = phi ptr [ %6, %.lr.ph.prol ], [ %0, %.lr.ph.preheader ]
  %.036.prol = phi i64 [ %5, %.lr.ph.prol ], [ %1, %.lr.ph.preheader ]
  %prol.iter = phi i64 [ %prol.iter.next, %.lr.ph.prol ], [ 0, %.lr.ph.preheader ]
  %5 = add i64 %.036.prol, -1
  %6 = getelementptr inbounds i8, ptr %.07.prol, i64 1
  store volatile i8 0, ptr %.07.prol, align 1, !tbaa !5
  %prol.iter.next = add i64 %prol.iter, 1
  %prol.iter.cmp.not = icmp eq i64 %prol.iter.next, %xtraiter
  br i1 %prol.iter.cmp.not, label %.lr.ph.prol.loopexit, label %.lr.ph.prol, !llvm.loop !8

.lr.ph.prol.loopexit:                             ; preds = %.lr.ph.prol, %.lr.ph.preheader
  %.07.unr = phi ptr [ %0, %.lr.ph.preheader ], [ %6, %.lr.ph.prol ]
  %.036.unr = phi i64 [ %1, %.lr.ph.preheader ], [ %5, %.lr.ph.prol ]
  %7 = icmp ult i64 %4, 7
  br i1 %7, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.prol.loopexit, %.lr.ph
  %.07 = phi ptr [ %16, %.lr.ph ], [ %.07.unr, %.lr.ph.prol.loopexit ]
  %.036 = phi i64 [ %15, %.lr.ph ], [ %.036.unr, %.lr.ph.prol.loopexit ]
  %8 = getelementptr inbounds i8, ptr %.07, i64 1
  store volatile i8 0, ptr %.07, align 1, !tbaa !5
  %9 = getelementptr inbounds i8, ptr %.07, i64 2
  store volatile i8 0, ptr %8, align 1, !tbaa !5
  %10 = getelementptr inbounds i8, ptr %.07, i64 3
  store volatile i8 0, ptr %9, align 1, !tbaa !5
  %11 = getelementptr inbounds i8, ptr %.07, i64 4
  store volatile i8 0, ptr %10, align 1, !tbaa !5
  %12 = getelementptr inbounds i8, ptr %.07, i64 5
  store volatile i8 0, ptr %11, align 1, !tbaa !5
  %13 = getelementptr inbounds i8, ptr %.07, i64 6
  store volatile i8 0, ptr %12, align 1, !tbaa !5
  %14 = getelementptr inbounds i8, ptr %.07, i64 7
  store volatile i8 0, ptr %13, align 1, !tbaa !5
  %15 = add i64 %.036, -8
  %16 = getelementptr inbounds i8, ptr %.07, i64 8
  store volatile i8 0, ptr %14, align 1, !tbaa !5
  %.not.7 = icmp eq i64 %15, 0
  br i1 %.not.7, label %.loopexit, label %.lr.ph, !llvm.loop !10

.loopexit:                                        ; preds = %.lr.ph.prol.loopexit, %.lr.ph, %2
  ret void
}

attributes #0 = { nofree norecurse 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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.unroll.disable"}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass