; LLVM IR from jermp/2i_bench :: external/CRoaring/src/containers (bitset)

; 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.bitset_container_s = type { i32, 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 zeroext i16 @bitset_container_maximum(ptr noundef %0) #1 {
  %2 = alloca i16, align 2
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i64, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  store i32 1023, ptr %4, align 4, !tbaa !9
  br label %8

8:                                                ; preds = %36, %1
  %9 = load i32, ptr %4, align 4, !tbaa !9
  %10 = icmp sgt i32 %9, 0
  br i1 %10, label %12, label %11

11:                                               ; preds = %8
  store i32 2, ptr %5, align 4
  br label %39

12:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  %13 = load ptr, ptr %3, align 8, !tbaa !5
  %14 = getelementptr inbounds %struct.bitset_container_s, ptr %13, i32 0, i32 1
  %15 = load ptr, ptr %14, align 8, !tbaa !11
  %16 = load i32, ptr %4, align 4, !tbaa !9
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds i64, ptr %15, i64 %17
  %19 = load i64, ptr %18, align 8, !tbaa !13
  store i64 %19, ptr %6, align 8, !tbaa !13
  %20 = load i64, ptr %6, align 8, !tbaa !13
  %21 = icmp ne i64 %20, 0
  br i1 %21, label %22, label %32

22:                                               ; preds = %12
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  %23 = load i64, ptr %6, align 8, !tbaa !13
  %24 = call i64 @llvm.ctlz.i64(i64 %23, i1 true)
  %25 = trunc i64 %24 to i32
  store i32 %25, ptr %7, align 4, !tbaa !9
  %26 = load i32, ptr %4, align 4, !tbaa !9
  %27 = mul nsw i32 %26, 64
  %28 = add nsw i32 %27, 63
  %29 = load i32, ptr %7, align 4, !tbaa !9
  %30 = sub nsw i32 %28, %29
  %31 = trunc i32 %30 to i16
  store i16 %31, ptr %2, align 2
  store i32 1, ptr %5, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  br label %33

32:                                               ; preds = %12
  store i32 0, ptr %5, align 4
  br label %33

33:                                               ; preds = %32, %22
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  %34 = load i32, ptr %5, align 4
  switch i32 %34, label %39 [
    i32 0, label %35
  ]

35:                                               ; preds = %33
  br label %36

36:                                               ; preds = %35
  %37 = load i32, ptr %4, align 4, !tbaa !9
  %38 = add nsw i32 %37, -1
  store i32 %38, ptr %4, align 4, !tbaa !9
  br label %8, !llvm.loop !15

39:                                               ; preds = %33, %11
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  %40 = load i32, ptr %5, align 4
  switch i32 %40, label %44 [
    i32 2, label %41
    i32 1, label %42
  ]

41:                                               ; preds = %39
  store i16 0, ptr %2, align 2
  br label %42

42:                                               ; preds = %41, %39
  %43 = load i16, ptr %2, align 2
  ret i16 %43

44:                                               ; preds = %39
  unreachable
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i64 @llvm.ctlz.i64(i64, i1 immarg) #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 = { 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, !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, !6, i64 8}
!12 = !{!"bitset_container_s", !10, i64 0, !6, i64 8}
!13 = !{!14, !14, i64 0}
!14 = !{!"long", !7, i64 0}
!15 = distinct !{!15, !16}
!16 = !{!"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: nofree norecurse nosync nounwind memory(read, inaccessiblemem: none) uwtable
define dso_local zeroext i16 @bitset_container_maximum(ptr nocapture noundef readonly %0) local_unnamed_addr #0 {
  %2 = getelementptr inbounds i8, ptr %0, i64 8
  %3 = load ptr, ptr %2, align 8, !tbaa !5
  br label %4

4:                                                ; preds = %18, %1
  %.01019 = phi i32 [ 1023, %1 ], [ %19, %18 ]
  %5 = zext nneg i32 %.01019 to i64
  %6 = getelementptr inbounds i64, ptr %3, i64 %5
  %7 = load i64, ptr %6, align 8, !tbaa !11
  %.not = icmp eq i64 %7, 0
  br i1 %.not, label %8, label %.split.loop.exit14

8:                                                ; preds = %4
  %9 = add nsw i32 %.01019, -1
  %10 = zext nneg i32 %9 to i64
  %11 = getelementptr inbounds i64, ptr %3, i64 %10
  %12 = load i64, ptr %11, align 8, !tbaa !11
  %.not.1 = icmp eq i64 %12, 0
  br i1 %.not.1, label %13, label %.split.loop.exit14

13:                                               ; preds = %8
  %14 = add nsw i32 %.01019, -2
  %15 = zext nneg i32 %14 to i64
  %16 = getelementptr inbounds i64, ptr %3, i64 %15
  %17 = load i64, ptr %16, align 8, !tbaa !11
  %.not.2 = icmp eq i64 %17, 0
  br i1 %.not.2, label %18, label %.split.loop.exit14

18:                                               ; preds = %13
  %19 = add nsw i32 %.01019, -3
  %20 = icmp ult i32 %14, 2
  br i1 %20, label %.split.loop.exit, label %4, !llvm.loop !13

.split.loop.exit14:                               ; preds = %13, %8, %4
  %.01019.lcssa = phi i32 [ %.01019, %4 ], [ %9, %8 ], [ %14, %13 ]
  %.lcssa = phi i64 [ %7, %4 ], [ %12, %8 ], [ %17, %13 ]
  %21 = tail call range(i64 0, 65) i64 @llvm.ctlz.i64(i64 %.lcssa, i1 true)
  %22 = trunc nuw nsw i64 %21 to i32
  %23 = shl nsw i32 %.01019.lcssa, 6
  %24 = or disjoint i32 %23, 63
  %25 = sub nuw nsw i32 %24, %22
  %26 = trunc i32 %25 to i16
  br label %.split.loop.exit

.split.loop.exit:                                 ; preds = %18, %.split.loop.exit14
  %spec.select = phi i16 [ %26, %.split.loop.exit14 ], [ 0, %18 ]
  ret i16 %spec.select
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i64 @llvm.ctlz.i64(i64, i1 immarg) #1

attributes #0 = { nofree norecurse nosync nounwind memory(read, inaccessiblemem: none) 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 nocallback nofree nosync nounwind speculatable willreturn memory(none) }

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


; Effective O3 passes: CorrelatedValuePropagationPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass