; LLVM IR from xing1357/SimpleOS :: src (pmm)

; 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"

%struct.PMM_INFO = type { i32, i32, ptr, i32, i32 }

@g_pmm_info = external hidden global %struct.PMM_INFO, align 8

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; 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 i32 @pmm_mmap_first_free_by_size(i32 noundef) #1

; Function Attrs: inlinehint nounwind uwtable
declare hidden void @pmm_mmap_set(i32 noundef) #2

; Function Attrs: nounwind uwtable
define dso_local ptr @pmm_alloc_blocks(i32 noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  %8 = load i32, ptr getelementptr inbounds (%struct.PMM_INFO, ptr @g_pmm_info, i32 0, i32 1), align 4, !tbaa !9
  %9 = load i32, ptr getelementptr inbounds (%struct.PMM_INFO, ptr @g_pmm_info, i32 0, i32 4), align 4, !tbaa !12
  %10 = sub i32 %8, %9
  %11 = load i32, ptr %3, align 4, !tbaa !5
  %12 = icmp ule i32 %10, %11
  br i1 %12, label %13, label %14

13:                                               ; preds = %1
  store ptr null, ptr %2, align 8
  store i32 1, ptr %5, align 4
  br label %44

14:                                               ; preds = %1
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  %15 = load i32, ptr %3, align 4, !tbaa !5
  %16 = call i32 @pmm_mmap_first_free_by_size(i32 noundef %15)
  store i32 %16, ptr %6, align 4, !tbaa !5
  %17 = load i32, ptr %6, align 4, !tbaa !5
  %18 = icmp eq i32 %17, -1
  br i1 %18, label %19, label %20

19:                                               ; preds = %14
  store ptr null, ptr %2, align 8
  store i32 1, ptr %5, align 4
  br label %43

20:                                               ; preds = %14
  store i32 0, ptr %4, align 4, !tbaa !5
  br label %21

21:                                               ; preds = %29, %20
  %22 = load i32, ptr %4, align 4, !tbaa !5
  %23 = load i32, ptr %3, align 4, !tbaa !5
  %24 = icmp ult i32 %22, %23
  br i1 %24, label %25, label %32

25:                                               ; preds = %21
  %26 = load i32, ptr %6, align 4, !tbaa !5
  %27 = load i32, ptr %4, align 4, !tbaa !5
  %28 = add i32 %26, %27
  call void @pmm_mmap_set(i32 noundef %28)
  br label %29

29:                                               ; preds = %25
  %30 = load i32, ptr %4, align 4, !tbaa !5
  %31 = add i32 %30, 1
  store i32 %31, ptr %4, align 4, !tbaa !5
  br label %21, !llvm.loop !13

32:                                               ; preds = %21
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  %33 = load i32, ptr %6, align 4, !tbaa !5
  %34 = mul nsw i32 %33, 4096
  %35 = load i32, ptr getelementptr inbounds (%struct.PMM_INFO, ptr @g_pmm_info, i32 0, i32 3), align 8, !tbaa !15
  %36 = add i32 %34, %35
  store i32 %36, ptr %7, align 4, !tbaa !5
  %37 = load i32, ptr %3, align 4, !tbaa !5
  %38 = load i32, ptr getelementptr inbounds (%struct.PMM_INFO, ptr @g_pmm_info, i32 0, i32 4), align 4, !tbaa !12
  %39 = add i32 %38, %37
  store i32 %39, ptr getelementptr inbounds (%struct.PMM_INFO, ptr @g_pmm_info, i32 0, i32 4), align 4, !tbaa !12
  %40 = load i32, ptr %7, align 4, !tbaa !5
  %41 = zext i32 %40 to i64
  %42 = inttoptr i64 %41 to ptr
  store ptr %42, ptr %2, align 8
  store i32 1, ptr %5, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  br label %43

43:                                               ; preds = %32, %19
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  br label %44

44:                                               ; preds = %43, %13
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  %45 = load ptr, ptr %2, align 8
  ret ptr %45
}

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 = { inlinehint 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 #3 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !6, i64 4}
!10 = !{!"", !6, i64 0, !6, i64 4, !11, i64 8, !6, i64 16, !6, i64 20}
!11 = !{!"any pointer", !7, i64 0}
!12 = !{!10, !6, i64 20}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = !{!10, !6, i64 16}


; 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"

%struct.PMM_INFO = type { i32, i32, ptr, i32, i32 }

@g_pmm_info = external hidden local_unnamed_addr global %struct.PMM_INFO, align 8

; Function Attrs: nounwind uwtable
declare dso_local i32 @pmm_mmap_first_free_by_size(i32 noundef) local_unnamed_addr #0

; Function Attrs: inlinehint nounwind uwtable
declare hidden void @pmm_mmap_set(i32 noundef) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
define dso_local ptr @pmm_alloc_blocks(i32 noundef %0) local_unnamed_addr #0 {
  %2 = load i32, ptr getelementptr inbounds (i8, ptr @g_pmm_info, i64 4), align 4, !tbaa !5
  %3 = load i32, ptr getelementptr inbounds (i8, ptr @g_pmm_info, i64 20), align 4, !tbaa !11
  %4 = sub i32 %2, %3
  %.not = icmp ugt i32 %4, %0
  br i1 %.not, label %5, label %17

5:                                                ; preds = %1
  %6 = tail call i32 @pmm_mmap_first_free_by_size(i32 noundef %0)
  %7 = icmp eq i32 %6, -1
  br i1 %7, label %17, label %.preheader

.preheader:                                       ; preds = %5
  %.not15 = icmp eq i32 %0, 0
  br i1 %.not15, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %.01114 = phi i32 [ %9, %.lr.ph ], [ 0, %.preheader ]
  %8 = add i32 %.01114, %6
  tail call void @pmm_mmap_set(i32 noundef %8)
  %9 = add nuw i32 %.01114, 1
  %exitcond.not = icmp eq i32 %9, %0
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !12

._crit_edge:                                      ; preds = %.lr.ph, %.preheader
  %10 = shl nsw i32 %6, 12
  %11 = load i32, ptr getelementptr inbounds (i8, ptr @g_pmm_info, i64 16), align 8, !tbaa !14
  %12 = add i32 %11, %10
  %13 = load i32, ptr getelementptr inbounds (i8, ptr @g_pmm_info, i64 20), align 4, !tbaa !11
  %14 = add i32 %13, %0
  store i32 %14, ptr getelementptr inbounds (i8, ptr @g_pmm_info, i64 20), align 4, !tbaa !11
  %15 = zext i32 %12 to i64
  %16 = inttoptr i64 %15 to ptr
  br label %17

17:                                               ; preds = %._crit_edge, %5, %1
  %.1 = phi ptr [ null, %1 ], [ %16, %._crit_edge ], [ null, %5 ]
  ret ptr %.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 = { inlinehint 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, !7, i64 4}
!6 = !{!"", !7, i64 0, !7, i64 4, !10, i64 8, !7, i64 16, !7, i64 20}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!6, !7, i64 20}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = !{!6, !7, i64 16}


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