; LLVM IR from IOsonata/IOsonata :: src/storage/diskio_impl.ll (ZN6DiskIO5ResetEv)

; 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"

%class.DiskIO = type { ptr, i32, i32, i32, ptr }
%struct.__DiskIO_Cache_Desc = type { i32, 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: mustprogress nounwind uwtable
define dso_local void @_ZN6DiskIO5ResetEv(ptr noundef nonnull align 8 dereferenceable(32) %0) unnamed_addr #1 align 2 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  %4 = load ptr, ptr %2, align 8
  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 = %24, %1
  %6 = load i32, ptr %3, align 4, !tbaa !9
  %7 = getelementptr inbounds %class.DiskIO, ptr %4, i32 0, i32 3
  %8 = load i32, ptr %7, align 8, !tbaa !11
  %9 = icmp slt i32 %6, %8
  br i1 %9, label %11, label %10

10:                                               ; preds = %5
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  br label %27

11:                                               ; preds = %5
  %12 = getelementptr inbounds %class.DiskIO, ptr %4, i32 0, i32 4
  %13 = load ptr, ptr %12, align 8, !tbaa !14
  %14 = load i32, ptr %3, align 4, !tbaa !9
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds %struct.__DiskIO_Cache_Desc, ptr %13, i64 %15
  %17 = getelementptr inbounds %struct.__DiskIO_Cache_Desc, ptr %16, i32 0, i32 0
  store volatile i32 0, ptr %17, align 4, !tbaa !15
  %18 = getelementptr inbounds %class.DiskIO, ptr %4, i32 0, i32 4
  %19 = load ptr, ptr %18, align 8, !tbaa !14
  %20 = load i32, ptr %3, align 4, !tbaa !9
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds %struct.__DiskIO_Cache_Desc, ptr %19, i64 %21
  %23 = getelementptr inbounds %struct.__DiskIO_Cache_Desc, ptr %22, i32 0, i32 1
  store i32 -1, ptr %23, align 4, !tbaa !17
  br label %24

24:                                               ; preds = %11
  %25 = load i32, ptr %3, align 4, !tbaa !9
  %26 = add nsw i32 %25, 1
  store i32 %26, ptr %3, align 4, !tbaa !9
  br label %5, !llvm.loop !18

27:                                               ; preds = %10
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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 = !{!12, !10, i64 16}
!12 = !{!"_ZTS6DiskIO", !13, i64 8, !10, i64 12, !10, i64 16, !6, i64 24}
!13 = !{!"_ZTS12__DiskIOType", !7, i64 0}
!14 = !{!12, !6, i64 24}
!15 = !{!16, !10, i64 0}
!16 = !{!"_ZTS19__DiskIO_Cache_Desc", !10, i64 0, !10, i64 4, !6, i64 8}
!17 = !{!16, !10, i64 4}
!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.__DiskIO_Cache_Desc = type { i32, i32, ptr }

; Function Attrs: mustprogress nofree norecurse nounwind uwtable
define dso_local void @_ZN6DiskIO5ResetEv(ptr nocapture noundef nonnull readonly align 8 dereferenceable(32) %0) unnamed_addr #0 align 2 {
  %2 = getelementptr inbounds i8, ptr %0, i64 16
  %3 = load i32, ptr %2, align 8, !tbaa !5
  %.fr = freeze i32 %3
  %4 = icmp sgt i32 %.fr, 0
  br i1 %4, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %1
  %5 = getelementptr inbounds i8, ptr %0, i64 24
  %6 = load ptr, ptr %5, align 8, !tbaa !12
  %wide.trip.count = zext i32 %.fr to i64
  %xtraiter = and i64 %wide.trip.count, 1
  %7 = icmp eq i32 %.fr, 1
  br i1 %7, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph.new

.lr.ph.new:                                       ; preds = %.lr.ph
  %unroll_iter = and i64 %wide.trip.count, 4294967294
  br label %10

._crit_edge.loopexit.unr-lcssa:                   ; preds = %10, %.lr.ph
  %indvars.iv.unr = phi i64 [ 0, %.lr.ph ], [ %indvars.iv.next.1, %10 ]
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %._crit_edge, label %._crit_edge.loopexit.epilog-lcssa

._crit_edge.loopexit.epilog-lcssa:                ; preds = %._crit_edge.loopexit.unr-lcssa
  %8 = getelementptr inbounds %struct.__DiskIO_Cache_Desc, ptr %6, i64 %indvars.iv.unr
  store volatile i32 0, ptr %8, align 4, !tbaa !13
  %9 = getelementptr inbounds %struct.__DiskIO_Cache_Desc, ptr %6, i64 %indvars.iv.unr, i32 1
  store i32 -1, ptr %9, align 4, !tbaa !15
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit.epilog-lcssa, %._crit_edge.loopexit.unr-lcssa, %1
  ret void

10:                                               ; preds = %10, %.lr.ph.new
  %indvars.iv = phi i64 [ 0, %.lr.ph.new ], [ %indvars.iv.next.1, %10 ]
  %niter = phi i64 [ 0, %.lr.ph.new ], [ %niter.next.1, %10 ]
  %11 = getelementptr inbounds %struct.__DiskIO_Cache_Desc, ptr %6, i64 %indvars.iv
  store volatile i32 0, ptr %11, align 4, !tbaa !13
  %12 = getelementptr inbounds %struct.__DiskIO_Cache_Desc, ptr %6, i64 %indvars.iv, i32 1
  store i32 -1, ptr %12, align 4, !tbaa !15
  %indvars.iv.next = or disjoint i64 %indvars.iv, 1
  %13 = getelementptr inbounds %struct.__DiskIO_Cache_Desc, ptr %6, i64 %indvars.iv.next
  store volatile i32 0, ptr %13, align 4, !tbaa !13
  %14 = getelementptr inbounds %struct.__DiskIO_Cache_Desc, ptr %6, i64 %indvars.iv.next, i32 1
  store i32 -1, ptr %14, align 4, !tbaa !15
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %niter.next.1 = add i64 %niter, 2
  %niter.ncmp.1 = icmp eq i64 %niter.next.1, %unroll_iter
  br i1 %niter.ncmp.1, label %._crit_edge.loopexit.unr-lcssa, label %10, !llvm.loop !16
}

attributes #0 = { mustprogress nofree norecurse 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, !10, i64 16}
!6 = !{!"_ZTS6DiskIO", !7, i64 8, !10, i64 12, !10, i64 16, !11, i64 24}
!7 = !{!"_ZTS12__DiskIOType", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!"any pointer", !8, i64 0}
!12 = !{!6, !11, i64 24}
!13 = !{!14, !10, i64 0}
!14 = !{!"_ZTS19__DiskIO_Cache_Desc", !10, i64 0, !10, i64 4, !11, i64 8}
!15 = !{!14, !10, i64 4}
!16 = distinct !{!16, !17}
!17 = !{!"llvm.loop.mustprogress"}


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