; LLVM IR from zhemao/libds :: heap (build_heap)

; 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.heap = type { ptr, ptr }
%struct.vector = type { ptr, ptr, i64, i64, ptr }

; 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 void @heapify(ptr noundef, i32 noundef) #1

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

13:                                               ; preds = %19, %1
  %14 = load i32, ptr %3, align 4, !tbaa !14
  %15 = icmp sge i32 %14, 0
  br i1 %15, label %16, label %22

16:                                               ; preds = %13
  %17 = load ptr, ptr %2, align 8, !tbaa !5
  %18 = load i32, ptr %3, align 4, !tbaa !14
  call void @heapify(ptr noundef %17, i32 noundef %18)
  br label %19

19:                                               ; preds = %16
  %20 = load i32, ptr %3, align 4, !tbaa !14
  %21 = add nsw i32 %20, -1
  store i32 %21, ptr %3, align 4, !tbaa !14
  br label %13, !llvm.loop !16

22:                                               ; preds = %13
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret void
}

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 }

!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, !6, i64 0}
!10 = !{!"heap", !6, i64 0, !6, i64 8}
!11 = !{!12, !13, i64 16}
!12 = !{!"vector", !6, i64 0, !6, i64 8, !13, i64 16, !13, i64 24, !6, i64 32}
!13 = !{!"long", !7, i64 0}
!14 = !{!15, !15, i64 0}
!15 = !{!"int", !7, i64 0}
!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"

; Function Attrs: nounwind uwtable
declare dso_local void @heapify(ptr noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @build_heap(ptr noundef %0) local_unnamed_addr #0 {
  %2 = load ptr, ptr %0, align 8, !tbaa !5
  %3 = getelementptr inbounds i8, ptr %2, i64 16
  %4 = load i64, ptr %3, align 8, !tbaa !10
  %5 = add i64 %4, 8589934590
  %6 = lshr i64 %5, 1
  %7 = trunc i64 %6 to i32
  %8 = icmp sgt i32 %7, -1
  br i1 %8, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %1, %.lr.ph
  %.04 = phi i32 [ %9, %.lr.ph ], [ %7, %1 ]
  tail call void @heapify(ptr noundef nonnull %0, i32 noundef %.04)
  %9 = add nsw i32 %.04, -1
  %.not = icmp eq i32 %.04, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !13

._crit_edge:                                      ; preds = %.lr.ph, %1
  ret void
}

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" }

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


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