; LLVM IR from freddiev4/dailyprogrammerchallenges :: Easy Challenges/Challenge 0175 Easy - Bogo!/solutions (solution)

; 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 void @shuffle(ptr noundef %0, i32 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
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #5
  %8 = load i32, ptr %4, align 4, !tbaa !9
  %9 = sext i32 %8 to i64
  %10 = mul i64 %9, 1
  %11 = call noalias ptr @malloc(i64 noundef %10) #6
  store ptr %11, ptr %5, align 8, !tbaa !5
  %12 = load ptr, ptr %5, align 8, !tbaa !5
  %13 = load ptr, ptr %3, align 8, !tbaa !5
  %14 = load i32, ptr %4, align 4, !tbaa !9
  %15 = sext i32 %14 to i64
  %16 = mul i64 %15, 1
  call void @llvm.memcpy.p0.p0.i64(ptr align 1 %12, ptr align 1 %13, i64 %16, i1 false)
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #5
  %17 = load i32, ptr %4, align 4, !tbaa !9
  store i32 %17, ptr %6, align 4, !tbaa !9
  br label %18

18:                                               ; preds = %47, %2
  %19 = load i32, ptr %6, align 4, !tbaa !9
  %20 = icmp sgt i32 %19, 0
  br i1 %20, label %22, label %21

21:                                               ; preds = %18
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #5
  br label %50

22:                                               ; preds = %18
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #5
  %23 = call i32 @rand() #5
  %24 = load i32, ptr %6, align 4, !tbaa !9
  %25 = srem i32 %23, %24
  store i32 %25, ptr %7, align 4, !tbaa !9
  %26 = load ptr, ptr %5, align 8, !tbaa !5
  %27 = load i32, ptr %7, align 4, !tbaa !9
  %28 = sext i32 %27 to i64
  %29 = getelementptr inbounds i8, ptr %26, i64 %28
  %30 = load i8, ptr %29, align 1, !tbaa !11
  %31 = load ptr, ptr %3, align 8, !tbaa !5
  %32 = load i32, ptr %4, align 4, !tbaa !9
  %33 = load i32, ptr %6, align 4, !tbaa !9
  %34 = sub nsw i32 %32, %33
  %35 = sext i32 %34 to i64
  %36 = getelementptr inbounds i8, ptr %31, i64 %35
  store i8 %30, ptr %36, align 1, !tbaa !11
  %37 = load ptr, ptr %5, align 8, !tbaa !5
  %38 = load i32, ptr %6, align 4, !tbaa !9
  %39 = sub nsw i32 %38, 1
  %40 = sext i32 %39 to i64
  %41 = getelementptr inbounds i8, ptr %37, i64 %40
  %42 = load i8, ptr %41, align 1, !tbaa !11
  %43 = load ptr, ptr %5, align 8, !tbaa !5
  %44 = load i32, ptr %7, align 4, !tbaa !9
  %45 = sext i32 %44 to i64
  %46 = getelementptr inbounds i8, ptr %43, i64 %45
  store i8 %42, ptr %46, align 1, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #5
  br label %47

47:                                               ; preds = %22
  %48 = load i32, ptr %6, align 4, !tbaa !9
  %49 = add nsw i32 %48, -1
  store i32 %49, ptr %6, align 4, !tbaa !9
  br label %18, !llvm.loop !12

50:                                               ; preds = %21
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #5
  ret void
}

; 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 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: nounwind
declare i32 @rand() #4

; 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 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #4 = { nounwind "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 #5 = { nounwind }
attributes #6 = { 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 = !{!"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 = !{!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: nounwind uwtable
define dso_local void @shuffle(ptr nocapture noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = sext i32 %1 to i64
  %4 = tail call noalias ptr @malloc(i64 noundef %3) #4
  tail call void @llvm.memcpy.p0.p0.i64(ptr align 1 %4, ptr align 1 %0, i64 %3, i1 false)
  %invariant.gep = getelementptr i8, ptr %4, i64 -1
  %5 = icmp sgt i32 %1, 0
  br i1 %5, label %.lr.ph, label %._crit_edge

._crit_edge:                                      ; preds = %.lr.ph, %2
  ret void

.lr.ph:                                           ; preds = %2, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ %3, %2 ]
  %6 = tail call i32 @rand() #5
  %7 = trunc nuw nsw i64 %indvars.iv to i32
  %8 = srem i32 %6, %7
  %9 = sext i32 %8 to i64
  %10 = getelementptr inbounds i8, ptr %4, i64 %9
  %11 = load i8, ptr %10, align 1, !tbaa !5
  %12 = sub nuw nsw i64 %3, %indvars.iv
  %13 = getelementptr inbounds i8, ptr %0, i64 %12
  store i8 %11, ptr %13, align 1, !tbaa !5
  %gep = getelementptr i8, ptr %invariant.gep, i64 %indvars.iv
  %14 = load i8, ptr %gep, align 1, !tbaa !5
  store i8 %14, ptr %10, align 1, !tbaa !5
  %indvars.iv.next = add nsw i64 %indvars.iv, -1
  %15 = icmp sgt i64 %indvars.iv, 1
  br i1 %15, label %.lr.ph, label %._crit_edge, !llvm.loop !8
}

; 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

; 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: nounwind
declare i32 @rand() local_unnamed_addr #3

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 = { 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 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { nounwind "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 #4 = { nounwind allocsize(0) }
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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass