; LLVM IR from Simple-XX/SimpleKernel :: src/kernel/firstfit.ll (ZN8FIRSTFIT5allocEm)

; 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"

%class.ALLOCATOR = type { ptr, ptr, i64, i64, i64, i64 }

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN8FIRSTFIT3setEm(ptr noundef nonnull align 8 dereferenceable(4144), i64 noundef) #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNK8FIRSTFIT8find_lenEmb(ptr noundef nonnull align 8 dereferenceable(4144), i64 noundef, i1 noundef zeroext) #0 align 2

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

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

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_ZN8FIRSTFIT5allocEm(ptr noundef nonnull align 8 dereferenceable(4144) %0, i64 noundef %1) unnamed_addr #0 align 2 {
  %3 = alloca i64, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i64, align 8
  %6 = alloca i64, align 8
  %7 = alloca i64, align 8
  %8 = alloca i32, align 4
  %9 = alloca i64, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i64 %1, ptr %5, align 8, !tbaa !9
  %10 = load ptr, ptr %4, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  store i64 0, ptr %6, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  %11 = load i64, ptr %5, align 8, !tbaa !9
  %12 = call noundef i64 @_ZNK8FIRSTFIT8find_lenEmb(ptr noundef nonnull align 8 dereferenceable(4144) %10, i64 noundef %11, i1 noundef zeroext false)
  store i64 %12, ptr %7, align 8, !tbaa !9
  %13 = load i64, ptr %7, align 8, !tbaa !9
  %14 = icmp eq i64 %13, -1
  br i1 %14, label %15, label %17

15:                                               ; preds = %2
  %16 = load i64, ptr %6, align 8, !tbaa !9
  store i64 %16, ptr %3, align 8
  store i32 1, ptr %8, align 4
  br label %46

17:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #2
  %18 = load i64, ptr %7, align 8, !tbaa !9
  store i64 %18, ptr %9, align 8, !tbaa !9
  br label %19

19:                                               ; preds = %28, %17
  %20 = load i64, ptr %9, align 8, !tbaa !9
  %21 = load i64, ptr %7, align 8, !tbaa !9
  %22 = load i64, ptr %5, align 8, !tbaa !9
  %23 = add i64 %21, %22
  %24 = icmp ult i64 %20, %23
  br i1 %24, label %26, label %25

25:                                               ; preds = %19
  store i32 2, ptr %8, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #2
  br label %31

26:                                               ; preds = %19
  %27 = load i64, ptr %9, align 8, !tbaa !9
  call void @_ZN8FIRSTFIT3setEm(ptr noundef nonnull align 8 dereferenceable(4144) %10, i64 noundef %27)
  br label %28

28:                                               ; preds = %26
  %29 = load i64, ptr %9, align 8, !tbaa !9
  %30 = add i64 %29, 1
  store i64 %30, ptr %9, align 8, !tbaa !9
  br label %19, !llvm.loop !11

31:                                               ; preds = %25
  %32 = getelementptr inbounds %class.ALLOCATOR, ptr %10, i32 0, i32 2
  %33 = load i64, ptr %32, align 8, !tbaa !13
  %34 = load i64, ptr %7, align 8, !tbaa !9
  %35 = mul i64 4096, %34
  %36 = add i64 %33, %35
  store i64 %36, ptr %6, align 8, !tbaa !9
  %37 = load i64, ptr %5, align 8, !tbaa !9
  %38 = getelementptr inbounds %class.ALLOCATOR, ptr %10, i32 0, i32 4
  %39 = load i64, ptr %38, align 8, !tbaa !15
  %40 = sub i64 %39, %37
  store i64 %40, ptr %38, align 8, !tbaa !15
  %41 = load i64, ptr %5, align 8, !tbaa !9
  %42 = getelementptr inbounds %class.ALLOCATOR, ptr %10, i32 0, i32 5
  %43 = load i64, ptr %42, align 8, !tbaa !16
  %44 = add i64 %43, %41
  store i64 %44, ptr %42, align 8, !tbaa !16
  %45 = load i64, ptr %6, align 8, !tbaa !9
  store i64 %45, ptr %3, align 8
  store i32 1, ptr %8, align 4
  br label %46

46:                                               ; preds = %31, %15
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  %47 = load i64, ptr %3, align 8
  ret i64 %47
}

attributes #0 = { mustprogress 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 }

!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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = !{!14, !10, i64 16}
!14 = !{!"_ZTS9ALLOCATOR", !6, i64 8, !10, i64 16, !10, i64 24, !10, i64 32, !10, i64 40}
!15 = !{!14, !10, i64 32}
!16 = !{!14, !10, i64 40}


; 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: mustprogress nounwind uwtable
declare dso_local void @_ZN8FIRSTFIT3setEm(ptr noundef nonnull align 8 dereferenceable(4144), i64 noundef) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNK8FIRSTFIT8find_lenEmb(ptr noundef nonnull align 8 dereferenceable(4144), i64 noundef, i1 noundef zeroext) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_ZN8FIRSTFIT5allocEm(ptr noundef nonnull align 8 dereferenceable(4144) %0, i64 noundef %1) unnamed_addr #0 align 2 {
  %3 = tail call noundef i64 @_ZNK8FIRSTFIT8find_lenEmb(ptr noundef nonnull align 8 dereferenceable(4144) %0, i64 noundef %1, i1 noundef zeroext false)
  %4 = icmp eq i64 %3, -1
  br i1 %4, label %18, label %.preheader

.preheader:                                       ; preds = %2
  %5 = add i64 %3, %1
  %6 = icmp ult i64 %3, %5
  br i1 %6, label %.lr.ph, label %._crit_edge

._crit_edge:                                      ; preds = %.lr.ph, %.preheader
  %7 = getelementptr inbounds i8, ptr %0, i64 16
  %8 = load i64, ptr %7, align 8, !tbaa !5
  %9 = shl i64 %3, 12
  %10 = add i64 %8, %9
  %11 = getelementptr inbounds i8, ptr %0, i64 32
  %12 = load i64, ptr %11, align 8, !tbaa !11
  %13 = sub i64 %12, %1
  store i64 %13, ptr %11, align 8, !tbaa !11
  %14 = getelementptr inbounds i8, ptr %0, i64 40
  %15 = load i64, ptr %14, align 8, !tbaa !12
  %16 = add i64 %15, %1
  store i64 %16, ptr %14, align 8, !tbaa !12
  br label %18

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %.016 = phi i64 [ %17, %.lr.ph ], [ %3, %.preheader ]
  tail call void @_ZN8FIRSTFIT3setEm(ptr noundef nonnull align 8 dereferenceable(4144) %0, i64 noundef %.016)
  %17 = add i64 %.016, 1
  %exitcond.not = icmp eq i64 %17, %5
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !13

18:                                               ; preds = %2, %._crit_edge
  %.014 = phi i64 [ %10, %._crit_edge ], [ 0, %2 ]
  ret i64 %.014
}

attributes #0 = { mustprogress 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, !10, i64 16}
!6 = !{!"_ZTS9ALLOCATOR", !7, i64 8, !10, i64 16, !10, i64 24, !10, i64 32, !10, i64 40}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"long", !8, i64 0}
!11 = !{!6, !10, i64 32}
!12 = !{!6, !10, i64 40}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass