; LLVM IR from begeekmyfriend/leetcode :: 0089_gray_code (gray_code)

; 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 @grayCode(i32 noundef %0, ptr noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca ptr, align 8
  store i32 %0, ptr %4, align 4, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !9
  %9 = load i32, ptr %4, align 4, !tbaa !5
  %10 = icmp slt i32 %9, 0
  br i1 %10, label %11, label %12

11:                                               ; preds = %2
  store ptr null, ptr %3, align 8
  br label %40

12:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  %13 = load i32, ptr %4, align 4, !tbaa !5
  %14 = shl i32 1, %13
  store i32 %14, ptr %7, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #3
  %15 = load i32, ptr %7, align 4, !tbaa !5
  %16 = sext i32 %15 to i64
  %17 = mul i64 %16, 4
  %18 = call noalias ptr @malloc(i64 noundef %17) #4
  store ptr %18, ptr %8, align 8, !tbaa !9
  store i32 0, ptr %6, align 4, !tbaa !5
  br label %19

19:                                               ; preds = %32, %12
  %20 = load i32, ptr %6, align 4, !tbaa !5
  %21 = load i32, ptr %7, align 4, !tbaa !5
  %22 = icmp slt i32 %20, %21
  br i1 %22, label %23, label %35

23:                                               ; preds = %19
  %24 = load i32, ptr %6, align 4, !tbaa !5
  %25 = ashr i32 %24, 1
  %26 = load i32, ptr %6, align 4, !tbaa !5
  %27 = xor i32 %25, %26
  %28 = load ptr, ptr %8, align 8, !tbaa !9
  %29 = load i32, ptr %6, align 4, !tbaa !5
  %30 = sext i32 %29 to i64
  %31 = getelementptr inbounds i32, ptr %28, i64 %30
  store i32 %27, ptr %31, align 4, !tbaa !5
  br label %32

32:                                               ; preds = %23
  %33 = load i32, ptr %6, align 4, !tbaa !5
  %34 = add nsw i32 %33, 1
  store i32 %34, ptr %6, align 4, !tbaa !5
  br label %19, !llvm.loop !11

35:                                               ; preds = %19
  %36 = load i32, ptr %4, align 4, !tbaa !5
  %37 = shl i32 1, %36
  %38 = load ptr, ptr %5, align 8, !tbaa !9
  store i32 %37, ptr %38, align 4, !tbaa !5
  %39 = load ptr, ptr %8, align 8, !tbaa !9
  store ptr %39, ptr %3, align 8
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  br label %40

40:                                               ; preds = %35, %11
  %41 = load ptr, ptr %3, align 8
  ret ptr %41
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

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" }
attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { nounwind allocsize(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 #3 = { nounwind }
attributes #4 = { nounwind allocsize(0) }

!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 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !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: nofree nounwind memory(write, inaccessiblemem: readwrite) uwtable
define dso_local noalias noundef ptr @grayCode(i32 noundef %0, ptr nocapture noundef writeonly %1) local_unnamed_addr #0 {
  %3 = icmp slt i32 %0, 0
  br i1 %3, label %23, label %4

4:                                                ; preds = %2
  %5 = shl nuw i32 1, %0
  %6 = sext i32 %5 to i64
  %7 = shl nsw i64 %6, 2
  %8 = tail call noalias ptr @malloc(i64 noundef %7) #2
  %.not = icmp eq i32 %0, 31
  br i1 %.not, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %4
  %min.iters.check = icmp slt i32 %5, 8
  br i1 %min.iters.check, label %.lr.ph, label %vector.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %9 = and i32 %5, 2147483640
  %n.vec = zext nneg i32 %9 to i64
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %vec.ind = phi <4 x i32> [ <i32 0, i32 1, i32 2, i32 3>, %vector.ph ], [ %vec.ind.next, %vector.body ]
  %step.add = add <4 x i32> %vec.ind, <i32 4, i32 4, i32 4, i32 4>
  %10 = lshr <4 x i32> %vec.ind, <i32 1, i32 1, i32 1, i32 1>
  %11 = lshr <4 x i32> %step.add, <i32 1, i32 1, i32 1, i32 1>
  %12 = xor <4 x i32> %10, %vec.ind
  %13 = xor <4 x i32> %11, %step.add
  %14 = getelementptr inbounds i32, ptr %8, i64 %index
  %15 = getelementptr inbounds i8, ptr %14, i64 16
  store <4 x i32> %12, ptr %14, align 4, !tbaa !5
  store <4 x i32> %13, ptr %15, align 4, !tbaa !5
  %index.next = add nuw i64 %index, 8
  %vec.ind.next = add <4 x i32> %vec.ind, <i32 8, i32 8, i32 8, i32 8>
  %16 = icmp eq i64 %index.next, %n.vec
  br i1 %16, label %._crit_edge, label %vector.body, !llvm.loop !9

.lr.ph:                                           ; preds = %.lr.ph.preheader
  store i32 0, ptr %8, align 4, !tbaa !5
  %exitcond.not = icmp slt i32 %5, 2
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph.1, !llvm.loop !13

.lr.ph.1:                                         ; preds = %.lr.ph
  %17 = getelementptr inbounds i8, ptr %8, i64 4
  store i32 1, ptr %17, align 4, !tbaa !5
  %exitcond.not.1 = icmp eq i32 %0, 1
  br i1 %exitcond.not.1, label %._crit_edge, label %.lr.ph.2, !llvm.loop !13

.lr.ph.2:                                         ; preds = %.lr.ph.1
  %18 = getelementptr inbounds i8, ptr %8, i64 8
  store i32 3, ptr %18, align 4, !tbaa !5
  %19 = getelementptr inbounds i8, ptr %8, i64 12
  store i32 2, ptr %19, align 4, !tbaa !5
  %exitcond.not.3 = icmp eq i32 %0, 2
  br i1 %exitcond.not.3, label %._crit_edge, label %.lr.ph.4, !llvm.loop !13

.lr.ph.4:                                         ; preds = %.lr.ph.2
  %20 = getelementptr inbounds i8, ptr %8, i64 16
  store i32 6, ptr %20, align 4, !tbaa !5
  %21 = getelementptr inbounds i8, ptr %8, i64 20
  store i32 7, ptr %21, align 4, !tbaa !5
  %22 = getelementptr inbounds i8, ptr %8, i64 24
  store i32 5, ptr %22, align 4, !tbaa !5
  br label %._crit_edge

._crit_edge:                                      ; preds = %vector.body, %.lr.ph, %.lr.ph.1, %.lr.ph.2, %.lr.ph.4, %4
  store i32 %5, ptr %1, align 4, !tbaa !5
  br label %23

23:                                               ; preds = %2, %._crit_edge
  %.0 = phi ptr [ %8, %._crit_edge ], [ null, %2 ]
  ret ptr %.0
}

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #1

attributes #0 = { nofree nounwind memory(write, inaccessiblemem: readwrite) 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 nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" "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 allocsize(0) }

!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: EarlyCSEPass,GVNPass,GlobalDCEPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopLoadEliminationPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,LoopVectorizePass,PostOrderFunctionAttrsPass,SCCPPass,SROAPass,SimplifyCFGPass,TailCallElimPass