; LLVM IR from lich0821/WeChatFerry :: WeChatFerry/rpc/nanopb (pb_decode)

; 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: nounwind uwtable
declare dso_local zeroext i1 @pb_decode_varint(ptr noundef, ptr noundef) #1

; Function Attrs: nounwind uwtable
define dso_local zeroext i1 @pb_decode_svarint(ptr noundef %0, ptr noundef %1) #1 {
  %3 = alloca i1, align 1
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i64, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %8 = load ptr, ptr %4, align 8, !tbaa !5
  %9 = call zeroext i1 @pb_decode_varint(ptr noundef %8, ptr noundef %6)
  br i1 %9, label %11, label %10

10:                                               ; preds = %2
  store i1 false, ptr %3, align 1
  store i32 1, ptr %7, align 4
  br label %25

11:                                               ; preds = %2
  %12 = load i64, ptr %6, align 8, !tbaa !9
  %13 = and i64 %12, 1
  %14 = icmp ne i64 %13, 0
  br i1 %14, label %15, label %20

15:                                               ; preds = %11
  %16 = load i64, ptr %6, align 8, !tbaa !9
  %17 = lshr i64 %16, 1
  %18 = xor i64 %17, -1
  %19 = load ptr, ptr %5, align 8, !tbaa !5
  store i64 %18, ptr %19, align 8, !tbaa !9
  br label %24

20:                                               ; preds = %11
  %21 = load i64, ptr %6, align 8, !tbaa !9
  %22 = lshr i64 %21, 1
  %23 = load ptr, ptr %5, align 8, !tbaa !5
  store i64 %22, ptr %23, align 8, !tbaa !9
  br label %24

24:                                               ; preds = %20, %15
  store i1 true, ptr %3, align 1
  store i32 1, ptr %7, align 4
  br label %25

25:                                               ; preds = %24, %10
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  %26 = load i1, ptr %3, align 1
  ret i1 %26
}

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 = !{!"long", !7, i64 0}


; 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 nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind uwtable
declare dso_local zeroext i1 @pb_decode_varint(ptr noundef, ptr noundef) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
define dso_local noundef zeroext i1 @pb_decode_svarint(ptr noundef %0, ptr nocapture noundef writeonly %1) local_unnamed_addr #1 {
  %3 = alloca i64, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #2
  %4 = call zeroext i1 @pb_decode_varint(ptr noundef %0, ptr noundef nonnull %3)
  br i1 %4, label %5, label %9

5:                                                ; preds = %2
  %6 = load i64, ptr %3, align 8, !tbaa !5
  %7 = lshr i64 %6, 1
  %8 = and i64 %6, 1
  %sext = sub nsw i64 0, %8
  %storemerge = xor i64 %7, %sext
  store i64 %storemerge, ptr %1, align 8, !tbaa !5
  br label %9

9:                                                ; preds = %2, %5
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #2
  ret i1 %4
}

attributes #0 = { mustprogress 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 = !{!"long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass