; LLVM IR from iqiyi/xgboost-serving :: tensorflow_serving/util/strings/string_piece.ll (ZNK11StringPiece13find_first_ofEPKcm)

; 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.StringPiece = type <{ ptr, i32, [4 x i8] }>

; 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 uwtable
define dso_local noundef i64 @_ZNK11StringPiece13find_first_ofEPKcm(ptr noundef nonnull align 8 dereferenceable(12) %0, ptr noundef %1, i64 noundef %2) #1 align 2 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i64, align 8
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store i64 %2, ptr %6, align 8, !tbaa !9
  %9 = load ptr, ptr %4, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #4
  %10 = getelementptr inbounds %class.StringPiece, ptr %9, i32 0, i32 0
  %11 = load ptr, ptr %10, align 8, !tbaa !11
  %12 = getelementptr inbounds %class.StringPiece, ptr %9, i32 0, i32 1
  %13 = load i32, ptr %12, align 8, !tbaa !14
  %14 = sext i32 %13 to i64
  %15 = getelementptr inbounds i8, ptr %11, i64 %14
  store ptr %15, ptr %7, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #4
  %16 = getelementptr inbounds %class.StringPiece, ptr %9, i32 0, i32 0
  %17 = load ptr, ptr %16, align 8, !tbaa !11
  %18 = load i64, ptr %6, align 8, !tbaa !9
  %19 = getelementptr inbounds i8, ptr %17, i64 %18
  %20 = load ptr, ptr %7, align 8, !tbaa !5
  %21 = load ptr, ptr %5, align 8, !tbaa !5
  %22 = load ptr, ptr %5, align 8, !tbaa !5
  %23 = load ptr, ptr %5, align 8, !tbaa !5
  %24 = call i64 @strlen(ptr noundef %23) #5
  %25 = getelementptr inbounds i8, ptr %22, i64 %24
  %26 = call noundef ptr @_ZSt13find_first_ofIPKcS1_ET_S2_S2_T0_S3_(ptr noundef %19, ptr noundef %20, ptr noundef %21, ptr noundef %25)
  store ptr %26, ptr %8, align 8, !tbaa !5
  %27 = load ptr, ptr %8, align 8, !tbaa !5
  %28 = load ptr, ptr %7, align 8, !tbaa !5
  %29 = icmp eq ptr %27, %28
  br i1 %29, label %30, label %31

30:                                               ; preds = %3
  br label %38

31:                                               ; preds = %3
  %32 = load ptr, ptr %8, align 8, !tbaa !5
  %33 = getelementptr inbounds %class.StringPiece, ptr %9, i32 0, i32 0
  %34 = load ptr, ptr %33, align 8, !tbaa !11
  %35 = ptrtoint ptr %32 to i64
  %36 = ptrtoint ptr %34 to i64
  %37 = sub i64 %35, %36
  br label %38

38:                                               ; preds = %31, %30
  %39 = phi i64 [ -1, %30 ], [ %37, %31 ]
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #4
  ret i64 %39
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef ptr @_ZSt13find_first_ofIPKcS1_ET_S2_S2_T0_S3_(ptr noundef, ptr noundef, ptr noundef, ptr noundef) #2

; Function Attrs: nounwind willreturn memory(read)
declare i64 @strlen(ptr noundef) #3

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress 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 = { 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 #3 = { nounwind willreturn memory(read) "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 #4 = { nounwind }
attributes #5 = { nounwind willreturn memory(read) }

!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 = !{!12, !6, i64 0}
!12 = !{!"_ZTS11StringPiece", !6, i64 0, !13, i64 8}
!13 = !{!"int", !7, i64 0}
!14 = !{!12, !13, i64 8}


; 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 nounwind uwtable
define dso_local noundef i64 @_ZNK11StringPiece13find_first_ofEPKcm(ptr nocapture noundef nonnull readonly align 8 dereferenceable(12) %0, ptr noundef %1, i64 noundef %2) local_unnamed_addr #0 align 2 {
  %4 = load ptr, ptr %0, align 8, !tbaa !5
  %5 = getelementptr inbounds i8, ptr %0, i64 8
  %6 = load i32, ptr %5, align 8, !tbaa !11
  %7 = sext i32 %6 to i64
  %8 = getelementptr inbounds i8, ptr %4, i64 %7
  %9 = getelementptr inbounds i8, ptr %4, i64 %2
  %10 = tail call i64 @strlen(ptr noundef nonnull dereferenceable(1) %1) #2
  %11 = getelementptr inbounds i8, ptr %1, i64 %10
  %12 = tail call noundef ptr @_ZSt13find_first_ofIPKcS1_ET_S2_S2_T0_S3_(ptr noundef %9, ptr noundef %8, ptr noundef %1, ptr noundef %11)
  %13 = icmp eq ptr %12, %8
  %14 = load ptr, ptr %0, align 8
  %15 = ptrtoint ptr %12 to i64
  %16 = ptrtoint ptr %14 to i64
  %17 = sub i64 %15, %16
  %18 = select i1 %13, i64 -1, i64 %17
  ret i64 %18
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef ptr @_ZSt13find_first_ofIPKcS1_ET_S2_S2_T0_S3_(ptr noundef, ptr noundef, ptr noundef, ptr noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nofree nounwind willreturn memory(argmem: read)
declare i64 @strlen(ptr nocapture noundef) local_unnamed_addr #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 = { mustprogress nofree nounwind willreturn memory(argmem: read) "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 willreturn memory(read) }

!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, !7, i64 0}
!6 = !{!"_ZTS11StringPiece", !7, i64 0, !10, i64 8}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!6, !10, i64 8}


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