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

; 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._kheap_block = type { %struct.anon, ptr, ptr }
%struct.anon = type { i32, i8 }

@g_head = external dso_local global ptr, align 8
@.str.1 = external hidden unnamed_addr constant [16 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [54 x i8], align 1

declare void @printf(ptr noundef, ...) #0

; 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: nounwind uwtable
define dso_local void @kheap_print_blocks() #2 {
  %1 = alloca ptr, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %1) #3
  %2 = load ptr, ptr @g_head, align 8, !tbaa !5
  store ptr %2, ptr %1, align 8, !tbaa !5
  call void (ptr, ...) @printf(ptr noundef @.str.1, i64 noundef 24)
  br label %3

3:                                                ; preds = %6, %0
  %4 = load ptr, ptr %1, align 8, !tbaa !5
  %5 = icmp ne ptr %4, null
  br i1 %5, label %6, label %26

6:                                                ; preds = %3
  %7 = load ptr, ptr %1, align 8, !tbaa !5
  %8 = getelementptr inbounds %struct._kheap_block, ptr %7, i32 0, i32 0
  %9 = getelementptr inbounds %struct.anon, ptr %8, i32 0, i32 0
  %10 = load i32, ptr %9, align 1, !tbaa !9
  %11 = load ptr, ptr %1, align 8, !tbaa !5
  %12 = getelementptr inbounds %struct._kheap_block, ptr %11, i32 0, i32 0
  %13 = getelementptr inbounds %struct.anon, ptr %12, i32 0, i32 1
  %14 = load i8, ptr %13, align 1, !tbaa !13
  %15 = zext i8 %14 to i32
  %16 = load ptr, ptr %1, align 8, !tbaa !5
  %17 = getelementptr inbounds %struct._kheap_block, ptr %16, i32 0, i32 2
  %18 = load ptr, ptr %17, align 1, !tbaa !14
  %19 = load ptr, ptr %1, align 8, !tbaa !5
  %20 = load ptr, ptr %1, align 8, !tbaa !5
  %21 = getelementptr inbounds %struct._kheap_block, ptr %20, i32 0, i32 1
  %22 = load ptr, ptr %21, align 1, !tbaa !15
  call void (ptr, ...) @printf(ptr noundef @.str.2, i32 noundef %10, i32 noundef %15, ptr noundef %18, ptr noundef %19, ptr noundef %22)
  %23 = load ptr, ptr %1, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct._kheap_block, ptr %23, i32 0, i32 1
  %25 = load ptr, ptr %24, align 1, !tbaa !15
  store ptr %25, ptr %1, align 8, !tbaa !5
  br label %3, !llvm.loop !16

26:                                               ; preds = %3
  call void @llvm.lifetime.end.p0(i64 8, ptr %1) #3
  ret void
}

attributes #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 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, !12, i64 0}
!10 = !{!"_kheap_block", !11, i64 0, !6, i64 8, !6, i64 16}
!11 = !{!"", !12, i64 0, !7, i64 4}
!12 = !{!"int", !7, i64 0}
!13 = !{!10, !7, i64 4}
!14 = !{!10, !6, i64 16}
!15 = !{!10, !6, i64 8}
!16 = distinct !{!16, !17}
!17 = !{!"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"

@g_head = external dso_local local_unnamed_addr global ptr, align 8
@.str.1 = external hidden unnamed_addr constant [16 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [54 x i8], align 1

declare void @printf(ptr noundef, ...) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @kheap_print_blocks() local_unnamed_addr #1 {
  %1 = load ptr, ptr @g_head, align 8, !tbaa !5
  tail call void (ptr, ...) @printf(ptr noundef nonnull @.str.1, i64 noundef 24) #2
  %.not7 = icmp eq ptr %1, null
  br i1 %.not7, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %.lr.ph
  %.08 = phi ptr [ %10, %.lr.ph ], [ %1, %0 ]
  %2 = load i32, ptr %.08, align 1, !tbaa !9
  %3 = getelementptr inbounds i8, ptr %.08, i64 4
  %4 = load i8, ptr %3, align 1, !tbaa !13
  %5 = zext i8 %4 to i32
  %6 = getelementptr inbounds i8, ptr %.08, i64 16
  %7 = load ptr, ptr %6, align 1, !tbaa !14
  %8 = getelementptr inbounds i8, ptr %.08, i64 8
  %9 = load ptr, ptr %8, align 1, !tbaa !15
  tail call void (ptr, ...) @printf(ptr noundef nonnull @.str.2, i32 noundef %2, i32 noundef %5, ptr noundef %7, ptr noundef nonnull %.08, ptr noundef %9) #2
  %10 = load ptr, ptr %8, align 1, !tbaa !15
  %.not = icmp eq ptr %10, null
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !16

._crit_edge:                                      ; preds = %.lr.ph, %0
  ret void
}

attributes #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" }
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/C++ TBAA"}
!9 = !{!10, !12, i64 0}
!10 = !{!"_kheap_block", !11, i64 0, !6, i64 8, !6, i64 16}
!11 = !{!"", !12, i64 0, !7, i64 4}
!12 = !{!"int", !7, i64 0}
!13 = !{!10, !7, i64 4}
!14 = !{!10, !6, i64 16}
!15 = !{!10, !6, i64 8}
!16 = distinct !{!16, !17}
!17 = !{!"llvm.loop.mustprogress"}


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