; LLVM IR from MrSupW/C-Source-Code-of-Sorting-Algorithm :: 排序5 堆排序.ll (Z8HeapSortPii)

; 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"

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_Z4SwapPiii(ptr noundef, i32 noundef, i32 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: mustprogress nounwind uwtable
declare dso_local void @_Z10HeapAdjustPiii(ptr noundef, i32 noundef, i32 noundef) #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z8HeapSortPii(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = 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) #2
  %6 = load i32, ptr %4, align 4, !tbaa !9
  %7 = sdiv i32 %6, 2
  store i32 %7, ptr %5, align 4, !tbaa !9
  br label %8

8:                                                ; preds = %15, %2
  %9 = load i32, ptr %5, align 4, !tbaa !9
  %10 = icmp sgt i32 %9, 0
  br i1 %10, label %11, label %18

11:                                               ; preds = %8
  %12 = load ptr, ptr %3, align 8, !tbaa !5
  %13 = load i32, ptr %5, align 4, !tbaa !9
  %14 = load i32, ptr %4, align 4, !tbaa !9
  call void @_Z10HeapAdjustPiii(ptr noundef %12, i32 noundef %13, i32 noundef %14)
  br label %15

15:                                               ; preds = %11
  %16 = load i32, ptr %5, align 4, !tbaa !9
  %17 = add nsw i32 %16, -1
  store i32 %17, ptr %5, align 4, !tbaa !9
  br label %8, !llvm.loop !11

18:                                               ; preds = %8
  %19 = load i32, ptr %4, align 4, !tbaa !9
  store i32 %19, ptr %5, align 4, !tbaa !9
  br label %20

20:                                               ; preds = %29, %18
  %21 = load i32, ptr %5, align 4, !tbaa !9
  %22 = icmp sgt i32 %21, 1
  br i1 %22, label %23, label %32

23:                                               ; preds = %20
  %24 = load ptr, ptr %3, align 8, !tbaa !5
  %25 = load i32, ptr %5, align 4, !tbaa !9
  call void @_Z4SwapPiii(ptr noundef %24, i32 noundef 1, i32 noundef %25)
  %26 = load ptr, ptr %3, align 8, !tbaa !5
  %27 = load i32, ptr %5, align 4, !tbaa !9
  %28 = sub nsw i32 %27, 1
  call void @_Z10HeapAdjustPiii(ptr noundef %26, i32 noundef 1, i32 noundef %28)
  br label %29

29:                                               ; preds = %23
  %30 = load i32, ptr %5, align 4, !tbaa !9
  %31 = add nsw i32 %30, -1
  store i32 %31, ptr %5, align 4, !tbaa !9
  br label %20, !llvm.loop !13

32:                                               ; preds = %20
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  ret void
}

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 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}


; 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 @_Z4SwapPiii(ptr noundef, i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_Z10HeapAdjustPiii(ptr noundef, i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z8HeapSortPii(ptr noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp sgt i32 %1, 1
  br i1 %3, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %2
  %4 = lshr i32 %1, 1
  br label %.lr.ph

.preheader:                                       ; preds = %.lr.ph
  br i1 %3, label %.lr.ph14, label %._crit_edge

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %.012 = phi i32 [ %5, %.lr.ph ], [ %4, %.lr.ph.preheader ]
  tail call void @_Z10HeapAdjustPiii(ptr noundef %0, i32 noundef %.012, i32 noundef %1)
  %5 = add nsw i32 %.012, -1
  %6 = icmp ugt i32 %.012, 1
  br i1 %6, label %.lr.ph, label %.preheader, !llvm.loop !5

.lr.ph14:                                         ; preds = %.preheader, %.lr.ph14
  %.113 = phi i32 [ %7, %.lr.ph14 ], [ %1, %.preheader ]
  tail call void @_Z4SwapPiii(ptr noundef %0, i32 noundef 1, i32 noundef %.113)
  %7 = add nsw i32 %.113, -1
  tail call void @_Z10HeapAdjustPiii(ptr noundef %0, i32 noundef 1, i32 noundef %7)
  %8 = icmp ugt i32 %.113, 2
  br i1 %8, label %.lr.ph14, label %._crit_edge, !llvm.loop !7

._crit_edge:                                      ; preds = %.lr.ph14, %2, %.preheader
  ret void
}

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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}
!7 = distinct !{!7, !6}


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