; 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: inlinehint nounwind uwtable
declare hidden void @pmm_mmap_unset(i32 noundef) #1

; Function Attrs: nounwind uwtable
define dso_local void @pmm_free_blocks(ptr noundef %0, i32 noundef %1) #2 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %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 4, ptr %5) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  %8 = load ptr, ptr %3, align 8, !tbaa !5
  %9 = ptrtoint ptr %8 to i32
  store i32 %9, ptr %6, align 4, !tbaa !9
  %10 = load i32, ptr getelementptr inbounds (%struct.PMM_INFO, ptr @g_pmm_info, i32 0, i32 3), align 8, !tbaa !11
  %11 = load i32, ptr %6, align 4, !tbaa !9
  %12 = sub i32 %11, %10
  store i32 %12, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  %13 = load i32, ptr %6, align 4, !tbaa !9
  %14 = udiv i32 %13, 4096
  store i32 %14, ptr %7, align 4, !tbaa !9
  store i32 0, ptr %5, align 4, !tbaa !9
  br label %15

15:                                               ; preds = %23, %2
  %16 = load i32, ptr %5, align 4, !tbaa !9
  %17 = load i32, ptr %4, align 4, !tbaa !9
  %18 = icmp ult i32 %16, %17
  br i1 %18, label %19, label %26

19:                                               ; preds = %15
  %20 = load i32, ptr %7, align 4, !tbaa !9
  %21 = load i32, ptr %5, align 4, !tbaa !9
  %22 = add i32 %20, %21
  call void @pmm_mmap_unset(i32 noundef %22)
  br label %23

23:                                               ; preds = %19
  %24 = load i32, ptr %5, align 4, !tbaa !9
  %25 = add i32 %24, 1
  store i32 %25, ptr %5, align 4, !tbaa !9
  br label %15, !llvm.loop !13

26:                                               ; preds = %15
  %27 = load i32, ptr %4, align 4, !tbaa !9
  %28 = load i32, ptr getelementptr inbounds (%struct.PMM_INFO, ptr @g_pmm_info, i32 0, i32 4), align 4, !tbaa !15
  %29 = sub i32 %28, %27
  store i32 %29, ptr getelementptr inbounds (%struct.PMM_INFO, ptr @g_pmm_info, i32 0, i32 4), align 4, !tbaa !15
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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" }
attributes #2 = { 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 = !{!"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 = !{!12, !10, i64 16}
!12 = !{!"", !10, i64 0, !10, i64 4, !6, i64 8, !10, i64 16, !10, i64 20}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = !{!12, !10, i64 20}


; 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: inlinehint nounwind uwtable
declare hidden void @pmm_mmap_unset(i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @pmm_free_blocks(ptr noundef %0, i32 noundef %1) local_unnamed_addr #1 {
  %3 = ptrtoint ptr %0 to i64
  %4 = trunc i64 %3 to i32
  %5 = load i32, ptr getelementptr inbounds (i8, ptr @g_pmm_info, i64 16), align 8, !tbaa !5
  %6 = sub i32 %4, %5
  %7 = lshr i32 %6, 12
  %.not = icmp eq i32 %1, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2, %.lr.ph
  %.09 = phi i32 [ %9, %.lr.ph ], [ 0, %2 ]
  %8 = add i32 %.09, %7
  tail call void @pmm_mmap_unset(i32 noundef %8)
  %9 = add nuw i32 %.09, 1
  %exitcond.not = icmp eq i32 %9, %1
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !11

._crit_edge:                                      ; preds = %.lr.ph, %2
  %10 = load i32, ptr getelementptr inbounds (i8, ptr @g_pmm_info, i64 20), align 4, !tbaa !13
  %11 = sub i32 %10, %1
  store i32 %11, ptr getelementptr inbounds (i8, ptr @g_pmm_info, i64 20), align 4, !tbaa !13
  ret void
}

attributes #0 = { 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 #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" }

!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 16}
!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 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = !{!6, !7, i64 20}


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