; LLVM IR from bartobri/data-structures-c :: priority-queue/doubly-linked-list-unordered-first-class (pq)

; 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.pq = type { ptr, ptr }
%struct.PQnode = type { i32, ptr, 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
define dso_local i32 @PQdelmax(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  %6 = load ptr, ptr %2, align 8, !tbaa !5
  %7 = getelementptr inbounds %struct.pq, ptr %6, i32 0, i32 0
  %8 = load ptr, ptr %7, align 8, !tbaa !9
  %9 = getelementptr inbounds %struct.PQnode, ptr %8, i32 0, i32 2
  %10 = load ptr, ptr %9, align 8, !tbaa !11
  store ptr %10, ptr %5, align 8, !tbaa !5
  %11 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %11, ptr %4, align 8, !tbaa !5
  br label %12

12:                                               ; preds = %31, %1
  %13 = load ptr, ptr %4, align 8, !tbaa !5
  %14 = getelementptr inbounds %struct.PQnode, ptr %13, i32 0, i32 2
  %15 = load ptr, ptr %14, align 8, !tbaa !11
  %16 = load ptr, ptr %2, align 8, !tbaa !5
  %17 = getelementptr inbounds %struct.pq, ptr %16, i32 0, i32 0
  %18 = load ptr, ptr %17, align 8, !tbaa !9
  %19 = icmp ne ptr %15, %18
  br i1 %19, label %20, label %35

20:                                               ; preds = %12
  %21 = load ptr, ptr %5, align 8, !tbaa !5
  %22 = getelementptr inbounds %struct.PQnode, ptr %21, i32 0, i32 0
  %23 = load i32, ptr %22, align 8, !tbaa !14
  %24 = load ptr, ptr %4, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.PQnode, ptr %24, i32 0, i32 0
  %26 = load i32, ptr %25, align 8, !tbaa !14
  %27 = icmp slt i32 %23, %26
  br i1 %27, label %28, label %30

28:                                               ; preds = %20
  %29 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %29, ptr %5, align 8, !tbaa !5
  br label %30

30:                                               ; preds = %28, %20
  br label %31

31:                                               ; preds = %30
  %32 = load ptr, ptr %4, align 8, !tbaa !5
  %33 = getelementptr inbounds %struct.PQnode, ptr %32, i32 0, i32 2
  %34 = load ptr, ptr %33, align 8, !tbaa !11
  store ptr %34, ptr %4, align 8, !tbaa !5
  br label %12, !llvm.loop !15

35:                                               ; preds = %12
  %36 = load ptr, ptr %5, align 8, !tbaa !5
  %37 = getelementptr inbounds %struct.PQnode, ptr %36, i32 0, i32 0
  %38 = load i32, ptr %37, align 8, !tbaa !14
  store i32 %38, ptr %3, align 4, !tbaa !17
  %39 = load ptr, ptr %5, align 8, !tbaa !5
  %40 = getelementptr inbounds %struct.PQnode, ptr %39, i32 0, i32 1
  %41 = load ptr, ptr %40, align 8, !tbaa !18
  %42 = load ptr, ptr %5, align 8, !tbaa !5
  %43 = getelementptr inbounds %struct.PQnode, ptr %42, i32 0, i32 2
  %44 = load ptr, ptr %43, align 8, !tbaa !11
  %45 = getelementptr inbounds %struct.PQnode, ptr %44, i32 0, i32 1
  store ptr %41, ptr %45, align 8, !tbaa !18
  %46 = load ptr, ptr %5, align 8, !tbaa !5
  %47 = getelementptr inbounds %struct.PQnode, ptr %46, i32 0, i32 2
  %48 = load ptr, ptr %47, align 8, !tbaa !11
  %49 = load ptr, ptr %5, align 8, !tbaa !5
  %50 = getelementptr inbounds %struct.PQnode, ptr %49, i32 0, i32 1
  %51 = load ptr, ptr %50, align 8, !tbaa !18
  %52 = getelementptr inbounds %struct.PQnode, ptr %51, i32 0, i32 2
  store ptr %48, ptr %52, align 8, !tbaa !11
  %53 = load ptr, ptr %5, align 8, !tbaa !5
  call void @free(ptr noundef %53) #3
  %54 = load i32, ptr %3, align 4, !tbaa !17
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  ret i32 %54
}

; Function Attrs: nounwind
declare void @free(ptr noundef) #2

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 "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, !6, i64 0}
!10 = !{!"pq", !6, i64 0, !6, i64 8}
!11 = !{!12, !6, i64 16}
!12 = !{!"PQnode", !13, i64 0, !6, i64 8, !6, i64 16}
!13 = !{!"int", !7, i64 0}
!14 = !{!12, !13, i64 0}
!15 = distinct !{!15, !16}
!16 = !{!"llvm.loop.mustprogress"}
!17 = !{!13, !13, i64 0}
!18 = !{!12, !6, i64 8}


; 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
define dso_local i32 @PQdelmax(ptr nocapture noundef readonly %0) local_unnamed_addr #0 {
  %2 = load ptr, ptr %0, align 8, !tbaa !5
  %3 = getelementptr inbounds i8, ptr %2, i64 16
  %4 = load ptr, ptr %3, align 8, !tbaa !10
  %5 = getelementptr inbounds i8, ptr %4, i64 16
  %6 = load ptr, ptr %5, align 8, !tbaa !10
  %.not15 = icmp eq ptr %6, %2
  br i1 %.not15, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %1
  %.pre = load i32, ptr %4, align 8, !tbaa !13
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %7 = phi i32 [ %11, %.lr.ph ], [ %.pre, %.lr.ph.preheader ]
  %8 = phi ptr [ %13, %.lr.ph ], [ %6, %.lr.ph.preheader ]
  %.017 = phi ptr [ %spec.select, %.lr.ph ], [ %4, %.lr.ph.preheader ]
  %.01416 = phi ptr [ %8, %.lr.ph ], [ %4, %.lr.ph.preheader ]
  %9 = load i32, ptr %.01416, align 8, !tbaa !13
  %10 = icmp slt i32 %7, %9
  %11 = tail call i32 @llvm.smax.i32(i32 %7, i32 %9)
  %spec.select = select i1 %10, ptr %.01416, ptr %.017
  %12 = getelementptr inbounds i8, ptr %8, i64 16
  %13 = load ptr, ptr %12, align 8, !tbaa !10
  %.not = icmp eq ptr %13, %2
  br i1 %.not, label %._crit_edge.loopexit, label %.lr.ph, !llvm.loop !14

._crit_edge.loopexit:                             ; preds = %.lr.ph
  %.phi.trans.insert = getelementptr inbounds i8, ptr %spec.select, i64 16
  %.pre18 = load ptr, ptr %.phi.trans.insert, align 8, !tbaa !10
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %1
  %14 = phi ptr [ %6, %1 ], [ %.pre18, %._crit_edge.loopexit ]
  %.0.lcssa = phi ptr [ %4, %1 ], [ %spec.select, %._crit_edge.loopexit ]
  %15 = load i32, ptr %.0.lcssa, align 8, !tbaa !13
  %16 = getelementptr inbounds i8, ptr %.0.lcssa, i64 8
  %17 = load ptr, ptr %16, align 8, !tbaa !16
  %18 = getelementptr inbounds i8, ptr %14, i64 8
  store ptr %17, ptr %18, align 8, !tbaa !16
  %19 = getelementptr inbounds i8, ptr %17, i64 16
  store ptr %14, ptr %19, align 8, !tbaa !10
  tail call void @free(ptr noundef nonnull %.0.lcssa) #3
  ret i32 %15
}

; Function Attrs: mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite)
declare void @free(ptr allocptr nocapture noundef) local_unnamed_addr #1

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.smax.i32(i32, i32) #2

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 = { mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite) "alloc-family"="malloc" "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 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
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, !7, i64 0}
!6 = !{!"pq", !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, !7, i64 16}
!11 = !{!"PQnode", !12, i64 0, !7, i64 8, !7, i64 16}
!12 = !{!"int", !8, i64 0}
!13 = !{!11, !12, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}
!16 = !{!11, !7, i64 8}


; Effective O3 passes: BDCEPass,CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass