; LLVM IR from thalium/icebox :: third_party/virtualbox/src/VBox/Devices/EFI/Firmware/MdePkg/Library (InternalMemSetMem32)

; 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: nounwind uwtable
define dso_local ptr @InternalMemSetMem32(ptr noundef %0, i64 noundef %1, i32 noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca i64, align 8
  %6 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i64 %1, ptr %5, align 8, !tbaa !9
  store i32 %2, ptr %6, align 4, !tbaa !11
  br label %7

7:                                                ; preds = %13, %3
  %8 = load i32, ptr %6, align 4, !tbaa !11
  %9 = load ptr, ptr %4, align 8, !tbaa !5
  %10 = load i64, ptr %5, align 8, !tbaa !9
  %11 = add i64 %10, -1
  store i64 %11, ptr %5, align 8, !tbaa !9
  %12 = getelementptr inbounds i32, ptr %9, i64 %11
  store i32 %8, ptr %12, align 4, !tbaa !11
  br label %13

13:                                               ; preds = %7
  %14 = load i64, ptr %5, align 8, !tbaa !9
  %15 = icmp ne i64 %14, 0
  br i1 %15, label %7, label %16, !llvm.loop !13

16:                                               ; preds = %13
  %17 = load ptr, ptr %4, align 8, !tbaa !5
  ret ptr %17
}

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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long long", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"int", !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: nofree norecurse nosync nounwind memory(argmem: write) uwtable
define dso_local noundef ptr @InternalMemSetMem32(ptr noundef returned writeonly %0, i64 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %min.iters.check = icmp ult i64 %1, 8
  br i1 %min.iters.check, label %scalar.ph.preheader, label %vector.ph

vector.ph:                                        ; preds = %3
  %n.vec = and i64 %1, -8
  %ind.end = and i64 %1, 7
  %broadcast.splatinsert = insertelement <4 x i32> poison, i32 %2, i64 0
  %broadcast.splat = shufflevector <4 x i32> %broadcast.splatinsert, <4 x i32> poison, <4 x i32> zeroinitializer
  %invariant.gep = getelementptr i32, ptr %0, i64 %1
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %4 = xor i64 %index, -1
  %gep = getelementptr i32, ptr %invariant.gep, i64 %4
  %5 = getelementptr inbounds i8, ptr %gep, i64 -12
  %6 = getelementptr inbounds i8, ptr %gep, i64 -28
  store <4 x i32> %broadcast.splat, ptr %5, align 4, !tbaa !5
  store <4 x i32> %broadcast.splat, ptr %6, align 4, !tbaa !5
  %index.next = add nuw i64 %index, 8
  %7 = icmp eq i64 %index.next, %n.vec
  br i1 %7, label %middle.block, label %vector.body, !llvm.loop !9

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.vec, %1
  br i1 %cmp.n, label %.loopexit, label %scalar.ph.preheader

scalar.ph.preheader:                              ; preds = %middle.block, %3
  %.0.ph = phi i64 [ %1, %3 ], [ %ind.end, %middle.block ]
  br label %scalar.ph

scalar.ph:                                        ; preds = %scalar.ph.preheader, %scalar.ph
  %.0 = phi i64 [ %8, %scalar.ph ], [ %.0.ph, %scalar.ph.preheader ]
  %8 = add i64 %.0, -1
  %9 = getelementptr inbounds i32, ptr %0, i64 %8
  store i32 %2, ptr %9, align 4, !tbaa !5
  %.not = icmp eq i64 %8, 0
  br i1 %.not, label %.loopexit, label %scalar.ph, !llvm.loop !13

.loopexit:                                        ; preds = %scalar.ph, %middle.block
  ret ptr %0
}

attributes #0 = { nofree norecurse nosync nounwind memory(argmem: write) 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10, !11, !12}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!"llvm.loop.isvectorized", i32 1}
!12 = !{!"llvm.loop.unroll.runtime.disable"}
!13 = distinct !{!13, !10, !12, !11}


; Effective O3 passes: GlobalOptPass,InstCombinePass,LICMPass,LoopLoadEliminationPass,LoopUnrollPass,LoopVectorizePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass