; LLVM IR from nsccgz-storage/nvlsm :: util/histogram.ll (ZN7leveldb9Histogram5ClearEv)

; 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.leveldb::Histogram" = type { double, double, double, double, double, [154 x double] }

@_ZN7leveldb9Histogram12kBucketLimitE = external dso_local constant [154 x double], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_ZN7leveldb9Histogram5ClearEv(ptr noundef nonnull align 8 dereferenceable(1272) %0) #0 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
  %5 = load double, ptr getelementptr inbounds ([154 x double], ptr @_ZN7leveldb9Histogram12kBucketLimitE, i64 0, i64 153), align 8, !tbaa !9
  %6 = getelementptr inbounds %"class.leveldb::Histogram", ptr %4, i32 0, i32 0
  store double %5, ptr %6, align 8, !tbaa !11
  %7 = getelementptr inbounds %"class.leveldb::Histogram", ptr %4, i32 0, i32 1
  store double 0.000000e+00, ptr %7, align 8, !tbaa !13
  %8 = getelementptr inbounds %"class.leveldb::Histogram", ptr %4, i32 0, i32 2
  store double 0.000000e+00, ptr %8, align 8, !tbaa !14
  %9 = getelementptr inbounds %"class.leveldb::Histogram", ptr %4, i32 0, i32 3
  store double 0.000000e+00, ptr %9, align 8, !tbaa !15
  %10 = getelementptr inbounds %"class.leveldb::Histogram", ptr %4, i32 0, i32 4
  store double 0.000000e+00, ptr %10, align 8, !tbaa !16
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  store i32 0, ptr %3, align 4, !tbaa !17
  br label %11

11:                                               ; preds = %20, %1
  %12 = load i32, ptr %3, align 4, !tbaa !17
  %13 = icmp slt i32 %12, 154
  br i1 %13, label %15, label %14

14:                                               ; preds = %11
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  br label %23

15:                                               ; preds = %11
  %16 = getelementptr inbounds %"class.leveldb::Histogram", ptr %4, i32 0, i32 5
  %17 = load i32, ptr %3, align 4, !tbaa !17
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds [154 x double], ptr %16, i64 0, i64 %18
  store double 0.000000e+00, ptr %19, align 8, !tbaa !9
  br label %20

20:                                               ; preds = %15
  %21 = load i32, ptr %3, align 4, !tbaa !17
  %22 = add nsw i32 %21, 1
  store i32 %22, ptr %3, align 4, !tbaa !17
  br label %11, !llvm.loop !19

23:                                               ; preds = %14
  ret void
}

; 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

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 = !{!"double", !7, i64 0}
!11 = !{!12, !10, i64 0}
!12 = !{!"_ZTSN7leveldb9HistogramE", !10, i64 0, !10, i64 8, !10, i64 16, !10, i64 24, !10, i64 32, !7, i64 40}
!13 = !{!12, !10, i64 8}
!14 = !{!12, !10, i64 16}
!15 = !{!12, !10, i64 24}
!16 = !{!12, !10, i64 32}
!17 = !{!18, !18, i64 0}
!18 = !{!"int", !7, i64 0}
!19 = distinct !{!19, !20}
!20 = !{!"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"

@_ZN7leveldb9Histogram12kBucketLimitE = external dso_local local_unnamed_addr constant [154 x double], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: write) uwtable
define dso_local void @_ZN7leveldb9Histogram5ClearEv(ptr nocapture noundef nonnull writeonly align 8 dereferenceable(1272) %0) local_unnamed_addr #0 align 2 {
  %2 = load double, ptr getelementptr inbounds (i8, ptr @_ZN7leveldb9Histogram12kBucketLimitE, i64 1224), align 8, !tbaa !5
  store double %2, ptr %0, align 8, !tbaa !9
  %3 = getelementptr inbounds i8, ptr %0, i64 8
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 8 dereferenceable(1264) %3, i8 0, i64 1264, i1 false)
  ret void
}

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #1

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: write) 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 nounwind willreturn memory(argmem: write) }

!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 = !{!"double", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !6, i64 0}
!10 = !{!"_ZTSN7leveldb9HistogramE", !6, i64 0, !6, i64 8, !6, i64 16, !6, i64 24, !6, i64 32, !7, i64 40}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LICMPass,LoopIdiomRecognizePass,LoopRotatePass,MemCpyOptPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass