; LLVM IR from attractivechaos/klib :: kalloc (kcalloc)

; 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: nounwind uwtable
define dso_local ptr @kcalloc(ptr noundef %0, i64 noundef %1, i64 noundef %2) #1 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i64, align 8
  %7 = alloca i64, align 8
  %8 = alloca ptr, align 8
  %9 = alloca ptr, align 8
  %10 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store i64 %1, ptr %6, align 8, !tbaa !9
  store i64 %2, ptr %7, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #4
  %11 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %11, ptr %8, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #4
  %12 = load i64, ptr %7, align 8, !tbaa !9
  %13 = icmp eq i64 %12, 0
  br i1 %13, label %17, label %14

14:                                               ; preds = %3
  %15 = load i64, ptr %6, align 8, !tbaa !9
  %16 = icmp eq i64 %15, 0
  br i1 %16, label %17, label %18

17:                                               ; preds = %14, %3
  store ptr null, ptr %4, align 8
  store i32 1, ptr %10, align 4
  br label %36

18:                                               ; preds = %14
  %19 = load ptr, ptr %8, align 8, !tbaa !5
  %20 = icmp eq ptr %19, null
  br i1 %20, label %21, label %25

21:                                               ; preds = %18
  %22 = load i64, ptr %6, align 8, !tbaa !9
  %23 = load i64, ptr %7, align 8, !tbaa !9
  %24 = call noalias ptr @calloc(i64 noundef %22, i64 noundef %23) #5
  store ptr %24, ptr %4, align 8
  store i32 1, ptr %10, align 4
  br label %36

25:                                               ; preds = %18
  %26 = load ptr, ptr %8, align 8, !tbaa !5
  %27 = load i64, ptr %6, align 8, !tbaa !9
  %28 = load i64, ptr %7, align 8, !tbaa !9
  %29 = mul i64 %27, %28
  %30 = call ptr @kmalloc(ptr noundef %26, i64 noundef %29)
  store ptr %30, ptr %9, align 8, !tbaa !5
  %31 = load ptr, ptr %9, align 8, !tbaa !5
  %32 = load i64, ptr %6, align 8, !tbaa !9
  %33 = load i64, ptr %7, align 8, !tbaa !9
  %34 = mul i64 %32, %33
  call void @llvm.memset.p0.i64(ptr align 1 %31, i8 0, i64 %34, i1 false)
  %35 = load ptr, ptr %9, align 8, !tbaa !5
  store ptr %35, ptr %4, align 8
  store i32 1, ptr %10, align 4
  br label %36

36:                                               ; preds = %25, %21, %17
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #4
  %37 = load ptr, ptr %4, align 8
  ret ptr %37
}

; 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
declare dso_local ptr @kmalloc(ptr noundef, i64 noundef) #1

; Function Attrs: nounwind allocsize(0,1)
declare noalias ptr @calloc(i64 noundef, i64 noundef) #2

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #3

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 allocsize(0,1) "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: write) }
attributes #4 = { nounwind }
attributes #5 = { nounwind allocsize(0,1) }

!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}


; 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 ptr @kcalloc(ptr noundef %0, i64 noundef %1, i64 noundef %2) local_unnamed_addr #0 {
  %4 = icmp eq i64 %2, 0
  %5 = icmp eq i64 %1, 0
  %or.cond = or i1 %5, %4
  br i1 %or.cond, label %13, label %6

6:                                                ; preds = %3
  %7 = icmp eq ptr %0, null
  br i1 %7, label %8, label %10

8:                                                ; preds = %6
  %9 = tail call noalias ptr @calloc(i64 noundef %1, i64 noundef %2) #3
  br label %13

10:                                               ; preds = %6
  %11 = mul i64 %2, %1
  %12 = tail call ptr @kmalloc(ptr noundef nonnull %0, i64 noundef %11)
  tail call void @llvm.memset.p0.i64(ptr align 1 %12, i8 0, i64 %11, i1 false)
  br label %13

13:                                               ; preds = %3, %10, %8
  %.0 = phi ptr [ %9, %8 ], [ %12, %10 ], [ null, %3 ]
  ret ptr %.0
}

; Function Attrs: nounwind uwtable
declare dso_local ptr @kmalloc(ptr noundef, i64 noundef) local_unnamed_addr #0

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

; Function Attrs: mustprogress nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #2

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,zeroed") allocsize(0,1) 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: write) }
attributes #3 = { nounwind allocsize(0,1) }

!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: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass