; LLVM IR from kmilo17pet/QuarkTS-cpp :: src/util.ll (ZN3qOS4util6strlenEPKcm)

; 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 i64 @_ZN3qOS4util6strlenEPKcm(ptr noundef %0, i64 noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca i64, align 8
  %5 = alloca i64, 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
  %7 = icmp eq ptr null, %6
  br i1 %7, label %11, label %8

8:                                                ; preds = %2
  %9 = load i64, ptr %4, align 8, !tbaa !9
  %10 = icmp eq i64 0, %9
  br i1 %10, label %11, label %12

11:                                               ; preds = %8, %2
  store i64 0, ptr %5, align 8, !tbaa !9
  br label %31

12:                                               ; preds = %8
  store i64 0, ptr %5, align 8, !tbaa !9
  br label %13

13:                                               ; preds = %23, %12
  %14 = load ptr, ptr %3, align 8, !tbaa !5
  %15 = load i8, ptr %14, align 1, !tbaa !11
  %16 = sext i8 %15 to i32
  %17 = icmp ne i32 0, %16
  br i1 %17, label %18, label %21

18:                                               ; preds = %13
  %19 = load i64, ptr %4, align 8, !tbaa !9
  %20 = icmp ugt i64 %19, 0
  br label %21

21:                                               ; preds = %18, %13
  %22 = phi i1 [ false, %13 ], [ %20, %18 ]
  br i1 %22, label %23, label %30

23:                                               ; preds = %21
  %24 = load i64, ptr %5, align 8, !tbaa !9
  %25 = add i64 %24, 1
  store i64 %25, ptr %5, align 8, !tbaa !9
  %26 = load i64, ptr %4, align 8, !tbaa !9
  %27 = add i64 %26, -1
  store i64 %27, ptr %4, align 8, !tbaa !9
  %28 = load ptr, ptr %3, align 8, !tbaa !5
  %29 = getelementptr inbounds i8, ptr %28, i32 1
  store ptr %29, ptr %3, align 8, !tbaa !5
  br label %13, !llvm.loop !12

30:                                               ; preds = %21
  br label %31

31:                                               ; preds = %30, %11
  %32 = load i64, ptr %5, align 8, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  ret i64 %32
}

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 willreturn memory(read, inaccessiblemem: none) uwtable
define dso_local noundef i64 @_ZN3qOS4util6strlenEPKcm(ptr noundef readonly %0, i64 noundef %1) local_unnamed_addr #0 {
  %3 = icmp eq ptr %0, null
  %4 = icmp eq i64 %1, 0
  %or.cond = or i1 %3, %4
  br i1 %or.cond, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %2
  %5 = load i8, ptr %0, align 1, !tbaa !5
  %.not = icmp eq i8 %5, 0
  br i1 %.not, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %.014 = phi i64 [ %6, %.lr.ph ], [ 0, %.preheader ]
  %.0813 = phi i64 [ %7, %.lr.ph ], [ %1, %.preheader ]
  %.0912 = phi ptr [ %8, %.lr.ph ], [ %0, %.preheader ]
  %6 = add nuw i64 %.014, 1
  %7 = add i64 %.0813, -1
  %8 = getelementptr inbounds i8, ptr %.0912, i64 1
  %9 = load i8, ptr %8, align 1, !tbaa !5
  %10 = icmp ne i8 %9, 0
  %11 = icmp ne i64 %7, 0
  %12 = select i1 %10, i1 %11, i1 false
  br i1 %12, label %.lr.ph, label %.loopexit, !llvm.loop !8

.loopexit:                                        ; preds = %.lr.ph, %.preheader, %2
  %.1 = phi i64 [ 0, %2 ], [ 0, %.preheader ], [ %6, %.lr.ph ]
  ret i64 %.1
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(read, 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,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass