; LLVM IR from nsccgz-storage/nvlsm :: util/coding.ll (ZN7leveldb14EncodeVarint64EPcm)

; 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"

; 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 noundef ptr @_ZN7leveldb14EncodeVarint64EPcm(ptr noundef %0, i64 noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca i64, align 8
  %5 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i64 %1, ptr %4, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  %6 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %6, ptr %5, align 8, !tbaa !5
  br label %7

7:                                                ; preds = %10, %2
  %8 = load i64, ptr %4, align 8, !tbaa !9
  %9 = icmp uge i64 %8, 128
  br i1 %9, label %10, label %18

10:                                               ; preds = %7
  %11 = load i64, ptr %4, align 8, !tbaa !9
  %12 = or i64 %11, 128
  %13 = trunc i64 %12 to i8
  %14 = load ptr, ptr %5, align 8, !tbaa !5
  %15 = getelementptr inbounds i8, ptr %14, i32 1
  store ptr %15, ptr %5, align 8, !tbaa !5
  store i8 %13, ptr %14, align 1, !tbaa !11
  %16 = load i64, ptr %4, align 8, !tbaa !9
  %17 = lshr i64 %16, 7
  store i64 %17, ptr %4, align 8, !tbaa !9
  br label %7, !llvm.loop !12

18:                                               ; preds = %7
  %19 = load i64, ptr %4, align 8, !tbaa !9
  %20 = trunc i64 %19 to i8
  %21 = load ptr, ptr %5, align 8, !tbaa !5
  %22 = getelementptr inbounds i8, ptr %21, i32 1
  store ptr %22, ptr %5, align 8, !tbaa !5
  store i8 %20, ptr %21, align 1, !tbaa !11
  %23 = load ptr, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  ret ptr %23
}

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 = !{!"long", !7, i64 0}
!11 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"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: mustprogress nofree norecurse nosync nounwind memory(write, inaccessiblemem: none) uwtable
define dso_local noundef nonnull ptr @_ZN7leveldb14EncodeVarint64EPcm(ptr noundef writeonly %0, i64 noundef %1) local_unnamed_addr #0 {
  %3 = icmp ugt i64 %1, 127
  br i1 %3, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %2, %.lr.ph
  %.09 = phi ptr [ %6, %.lr.ph ], [ %0, %2 ]
  %.078 = phi i64 [ %7, %.lr.ph ], [ %1, %2 ]
  %4 = trunc i64 %.078 to i8
  %5 = or i8 %4, -128
  %6 = getelementptr inbounds i8, ptr %.09, i64 1
  store i8 %5, ptr %.09, align 1, !tbaa !5
  %7 = lshr i64 %.078, 7
  %8 = icmp ugt i64 %.078, 16383
  br i1 %8, label %.lr.ph, label %._crit_edge, !llvm.loop !8

._crit_edge:                                      ; preds = %.lr.ph, %2
  %.07.lcssa = phi i64 [ %1, %2 ], [ %7, %.lr.ph ]
  %.0.lcssa = phi ptr [ %0, %2 ], [ %6, %.lr.ph ]
  %9 = trunc nuw nsw i64 %.07.lcssa to i8
  %10 = getelementptr inbounds i8, ptr %.0.lcssa, i64 1
  store i8 %9, ptr %.0.lcssa, align 1, !tbaa !5
  ret ptr %10
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind memory(write, 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, !6, i64 0}
!6 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass