; LLVM IR from attractivechaos/klib :: kexpr (ke_unset)

; 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.kexpr_s = type { i32, ptr }
%struct.ke1_s = type { i64, ptr, %union.anon, double, i64, ptr }
%union.anon = type { 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 void @ke_unset(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  store i32 0, ptr %3, align 4, !tbaa !9
  br label %5

5:                                                ; preds = %34, %1
  %6 = load i32, ptr %3, align 4, !tbaa !9
  %7 = load ptr, ptr %2, align 8, !tbaa !5
  %8 = getelementptr inbounds %struct.kexpr_s, ptr %7, i32 0, i32 0
  %9 = load i32, ptr %8, align 8, !tbaa !11
  %10 = icmp slt i32 %6, %9
  br i1 %10, label %11, label %37

11:                                               ; preds = %5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  %12 = load ptr, ptr %2, align 8, !tbaa !5
  %13 = getelementptr inbounds %struct.kexpr_s, ptr %12, i32 0, i32 1
  %14 = load ptr, ptr %13, align 8, !tbaa !13
  %15 = load i32, ptr %3, align 4, !tbaa !9
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds %struct.ke1_s, ptr %14, i64 %16
  store ptr %17, ptr %4, align 8, !tbaa !5
  %18 = load ptr, ptr %4, align 8, !tbaa !5
  %19 = load i64, ptr %18, align 8
  %20 = and i64 %19, 65535
  %21 = trunc i64 %20 to i32
  %22 = icmp eq i32 %21, 1
  br i1 %22, label %23, label %33

23:                                               ; preds = %11
  %24 = load ptr, ptr %4, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.ke1_s, ptr %24, i32 0, i32 1
  %26 = load ptr, ptr %25, align 8, !tbaa !14
  %27 = icmp ne ptr %26, null
  br i1 %27, label %28, label %33

28:                                               ; preds = %23
  %29 = load ptr, ptr %4, align 8, !tbaa !5
  %30 = load i64, ptr %29, align 8
  %31 = and i64 %30, -67108865
  %32 = or i64 %31, 0
  store i64 %32, ptr %29, align 8
  br label %33

33:                                               ; preds = %28, %23, %11
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  br label %34

34:                                               ; preds = %33
  %35 = load i32, ptr %3, align 4, !tbaa !9
  %36 = add nsw i32 %35, 1
  store i32 %36, ptr %3, align 4, !tbaa !9
  br label %5, !llvm.loop !18

37:                                               ; preds = %5
  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, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !10, i64 0}
!12 = !{!"kexpr_s", !10, i64 0, !6, i64 8}
!13 = !{!12, !6, i64 8}
!14 = !{!15, !6, i64 8}
!15 = !{!"ke1_s", !10, i64 0, !10, i64 2, !10, i64 3, !10, i64 3, !10, i64 4, !10, i64 5, !6, i64 8, !7, i64 16, !16, i64 24, !17, i64 32, !6, i64 40}
!16 = !{!"double", !7, i64 0}
!17 = !{!"long", !7, i64 0}
!18 = distinct !{!18, !19}
!19 = !{!"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"

%struct.ke1_s = type { i64, ptr, %union.anon, double, i64, ptr }
%union.anon = type { ptr }

; Function Attrs: nofree norecurse nosync nounwind memory(readwrite, inaccessiblemem: none) uwtable
define dso_local void @ke_unset(ptr nocapture noundef readonly %0) local_unnamed_addr #0 {
  %2 = load i32, ptr %0, align 8, !tbaa !5
  %3 = icmp sgt i32 %2, 0
  br i1 %3, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %1
  %4 = getelementptr inbounds i8, ptr %0, i64 8
  br label %5

5:                                                ; preds = %.lr.ph, %17
  %6 = phi i32 [ %2, %.lr.ph ], [ %18, %17 ]
  %indvars.iv = phi i64 [ 0, %.lr.ph ], [ %indvars.iv.next, %17 ]
  %7 = load ptr, ptr %4, align 8, !tbaa !11
  %8 = getelementptr inbounds %struct.ke1_s, ptr %7, i64 %indvars.iv
  %9 = load i64, ptr %8, align 8
  %10 = and i64 %9, 65535
  %11 = icmp eq i64 %10, 1
  br i1 %11, label %12, label %17

12:                                               ; preds = %5
  %13 = getelementptr inbounds i8, ptr %8, i64 8
  %14 = load ptr, ptr %13, align 8, !tbaa !12
  %.not = icmp eq ptr %14, null
  br i1 %.not, label %17, label %15

15:                                               ; preds = %12
  %16 = and i64 %9, -67174399
  store i64 %16, ptr %8, align 8
  %.pre = load i32, ptr %0, align 8, !tbaa !5
  br label %17

17:                                               ; preds = %15, %12, %5
  %18 = phi i32 [ %.pre, %15 ], [ %6, %12 ], [ %6, %5 ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %19 = sext i32 %18 to i64
  %20 = icmp slt i64 %indvars.iv.next, %19
  br i1 %20, label %5, label %._crit_edge, !llvm.loop !16

._crit_edge:                                      ; preds = %17, %1
  ret void
}

attributes #0 = { nofree norecurse nosync nounwind memory(readwrite, 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" }

!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 = !{!"kexpr_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 = !{!6, !10, i64 8}
!12 = !{!13, !10, i64 8}
!13 = !{!"ke1_s", !7, i64 0, !7, i64 2, !7, i64 3, !7, i64 3, !7, i64 4, !7, i64 5, !10, i64 8, !8, i64 16, !14, i64 24, !15, i64 32, !10, i64 40}
!14 = !{!"double", !8, i64 0}
!15 = !{!"long", !8, i64 0}
!16 = distinct !{!16, !17}
!17 = !{!"llvm.loop.mustprogress"}


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