; LLVM IR from KoishiDB/Koishi-DB :: src/util/encode.ll (ZN8koishidb14EncodeVarint32EjPc)

; 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: mustprogress nounwind uwtable
define dso_local noundef i64 @_ZN8koishidb14EncodeVarint32EjPc(i32 noundef %0, ptr noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i64, align 8
  store i32 %0, ptr %3, align 4, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  %7 = load ptr, ptr %4, align 8, !tbaa !9
  store ptr %7, ptr %5, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  store i64 0, ptr %6, align 8, !tbaa !11
  br label %8

8:                                                ; preds = %28, %2
  br label %9

9:                                                ; preds = %8
  %10 = load i64, ptr %6, align 8, !tbaa !11
  %11 = add i64 %10, 1
  store i64 %11, ptr %6, align 8, !tbaa !11
  %12 = load i32, ptr %3, align 4, !tbaa !5
  %13 = icmp ult i32 %12, 128
  br i1 %13, label %14, label %19

14:                                               ; preds = %9
  %15 = load i32, ptr %3, align 4, !tbaa !5
  %16 = trunc i32 %15 to i8
  %17 = load ptr, ptr %5, align 8, !tbaa !9
  %18 = getelementptr inbounds i8, ptr %17, i32 1
  store ptr %18, ptr %5, align 8, !tbaa !9
  store i8 %16, ptr %17, align 1, !tbaa !13
  br label %29

19:                                               ; preds = %9
  %20 = load i32, ptr %3, align 4, !tbaa !5
  %21 = and i32 %20, 127
  %22 = or i32 %21, 128
  %23 = trunc i32 %22 to i8
  %24 = load ptr, ptr %5, align 8, !tbaa !9
  %25 = getelementptr inbounds i8, ptr %24, i32 1
  store ptr %25, ptr %5, align 8, !tbaa !9
  store i8 %23, ptr %24, align 1, !tbaa !13
  %26 = load i32, ptr %3, align 4, !tbaa !5
  %27 = lshr i32 %26, 7
  store i32 %27, ptr %3, align 4, !tbaa !5
  br label %28

28:                                               ; preds = %19
  br label %8, !llvm.loop !14

29:                                               ; preds = %14
  %30 = load i64, ptr %6, align 8, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  ret i64 %30
}

; 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"long", !7, i64 0}
!13 = !{!7, !7, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"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 i64 @_ZN8koishidb14EncodeVarint32EjPc(i32 noundef %0, ptr nocapture noundef writeonly %1) local_unnamed_addr #0 {
  %3 = icmp ult i32 %0, 128
  br i1 %3, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %.lr.ph, %2
  %.09.lcssa = phi i32 [ %0, %2 ], [ %9, %.lr.ph ]
  %.08.lcssa = phi ptr [ %1, %2 ], [ %8, %.lr.ph ]
  %.lcssa = phi i64 [ 1, %2 ], [ %10, %.lr.ph ]
  %4 = trunc nuw nsw i32 %.09.lcssa to i8
  store i8 %4, ptr %.08.lcssa, align 1, !tbaa !5
  ret i64 %.lcssa

.lr.ph:                                           ; preds = %2, %.lr.ph
  %5 = phi i64 [ %10, %.lr.ph ], [ 1, %2 ]
  %.0811 = phi ptr [ %8, %.lr.ph ], [ %1, %2 ]
  %.0910 = phi i32 [ %9, %.lr.ph ], [ %0, %2 ]
  %6 = trunc i32 %.0910 to i8
  %7 = or i8 %6, -128
  %8 = getelementptr inbounds i8, ptr %.0811, i64 1
  store i8 %7, ptr %.0811, align 1, !tbaa !5
  %9 = lshr i32 %.0910, 7
  %10 = add nuw nsw i64 %5, 1
  %11 = icmp ult i32 %.0910, 16384
  br i1 %11, label %._crit_edge, label %.lr.ph, !llvm.loop !8
}

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: EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass