; LLVM IR from openxrlab/xrsfm :: 3rdparty/apriltag/common (string_util)

; 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"

@.str.1 = external hidden unnamed_addr constant [88 x i8], align 1
@.str.7 = external hidden unnamed_addr constant [17 x i8], align 1
@.str.8 = external hidden unnamed_addr constant [15 x i8], align 1
@__PRETTY_FUNCTION__.str_last_indexof = external hidden unnamed_addr constant [49 x i8], align 1

; Function Attrs: noreturn nounwind
declare void @__assert_fail(ptr noundef, ptr noundef, i32 noundef, ptr noundef) #0

; 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

; Function Attrs: nounwind willreturn memory(read)
declare i64 @strlen(ptr noundef) #2

; Function Attrs: nounwind willreturn memory(read)
declare i32 @strncmp(ptr noundef, ptr noundef, i64 noundef) #2

; Function Attrs: nounwind uwtable
define dso_local i32 @str_last_indexof(ptr noundef %0, ptr noundef %1) #3 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !5
  %9 = load ptr, ptr %3, align 8, !tbaa !5
  %10 = icmp ne ptr %9, null
  br i1 %10, label %11, label %12

11:                                               ; preds = %2
  br label %13

12:                                               ; preds = %2
  call void @__assert_fail(ptr noundef @.str.7, ptr noundef @.str.1, i32 noundef 263, ptr noundef @__PRETTY_FUNCTION__.str_last_indexof) #4
  unreachable

13:                                               ; preds = %11
  %14 = load ptr, ptr %4, align 8, !tbaa !5
  %15 = icmp ne ptr %14, null
  br i1 %15, label %16, label %17

16:                                               ; preds = %13
  br label %18

17:                                               ; preds = %13
  call void @__assert_fail(ptr noundef @.str.8, ptr noundef @.str.1, i32 noundef 264, ptr noundef @__PRETTY_FUNCTION__.str_last_indexof) #4
  unreachable

18:                                               ; preds = %16
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #5
  %19 = load ptr, ptr %3, align 8, !tbaa !5
  %20 = call i64 @strlen(ptr noundef %19) #6
  %21 = trunc i64 %20 to i32
  store i32 %21, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #5
  %22 = load ptr, ptr %4, align 8, !tbaa !5
  %23 = call i64 @strlen(ptr noundef %22) #6
  %24 = trunc i64 %23 to i32
  store i32 %24, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #5
  store i32 -1, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #5
  store i32 0, ptr %8, align 4, !tbaa !9
  br label %25

25:                                               ; preds = %45, %18
  %26 = load i32, ptr %8, align 4, !tbaa !9
  %27 = load i32, ptr %5, align 4, !tbaa !9
  %28 = load i32, ptr %6, align 4, !tbaa !9
  %29 = sub nsw i32 %27, %28
  %30 = icmp sle i32 %26, %29
  br i1 %30, label %32, label %31

31:                                               ; preds = %25
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #5
  br label %48

32:                                               ; preds = %25
  %33 = load ptr, ptr %3, align 8, !tbaa !5
  %34 = load i32, ptr %8, align 4, !tbaa !9
  %35 = sext i32 %34 to i64
  %36 = getelementptr inbounds i8, ptr %33, i64 %35
  %37 = load ptr, ptr %4, align 8, !tbaa !5
  %38 = load i32, ptr %6, align 4, !tbaa !9
  %39 = sext i32 %38 to i64
  %40 = call i32 @strncmp(ptr noundef %36, ptr noundef %37, i64 noundef %39) #6
  %41 = icmp ne i32 %40, 0
  br i1 %41, label %44, label %42

42:                                               ; preds = %32
  %43 = load i32, ptr %8, align 4, !tbaa !9
  store i32 %43, ptr %7, align 4, !tbaa !9
  br label %44

44:                                               ; preds = %42, %32
  br label %45

45:                                               ; preds = %44
  %46 = load i32, ptr %8, align 4, !tbaa !9
  %47 = add nsw i32 %46, 1
  store i32 %47, ptr %8, align 4, !tbaa !9
  br label %25, !llvm.loop !11

48:                                               ; preds = %31
  %49 = load i32, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #5
  ret i32 %49
}

attributes #0 = { noreturn nounwind "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 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 #3 = { 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 #4 = { noreturn nounwind }
attributes #5 = { nounwind }
attributes #6 = { 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/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"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"

@.str.1 = external hidden unnamed_addr constant [88 x i8], align 1
@.str.7 = external hidden unnamed_addr constant [17 x i8], align 1
@.str.8 = external hidden unnamed_addr constant [15 x i8], align 1
@__PRETTY_FUNCTION__.str_last_indexof = external hidden unnamed_addr constant [49 x i8], align 1

; Function Attrs: noreturn nounwind
declare void @__assert_fail(ptr noundef, ptr noundef, i32 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

; Function Attrs: mustprogress nofree nounwind willreturn memory(argmem: read)
declare i32 @strncmp(ptr nocapture noundef, ptr nocapture noundef, i64 noundef) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
define dso_local i32 @str_last_indexof(ptr noundef readonly %0, ptr noundef readonly %1) local_unnamed_addr #2 {
  %.not = icmp eq ptr %0, null
  br i1 %.not, label %3, label %4

3:                                                ; preds = %2
  tail call void @__assert_fail(ptr noundef nonnull @.str.7, ptr noundef nonnull @.str.1, i32 noundef 263, ptr noundef nonnull @__PRETTY_FUNCTION__.str_last_indexof) #3
  unreachable

4:                                                ; preds = %2
  %.not16 = icmp eq ptr %1, null
  br i1 %.not16, label %5, label %6

5:                                                ; preds = %4
  tail call void @__assert_fail(ptr noundef nonnull @.str.8, ptr noundef nonnull @.str.1, i32 noundef 264, ptr noundef nonnull @__PRETTY_FUNCTION__.str_last_indexof) #3
  unreachable

6:                                                ; preds = %4
  %7 = tail call i64 @strlen(ptr noundef nonnull dereferenceable(1) %0) #4
  %8 = trunc i64 %7 to i32
  %9 = tail call i64 @strlen(ptr noundef nonnull dereferenceable(1) %1) #4
  %10 = trunc i64 %9 to i32
  %.not1719 = icmp slt i32 %8, %10
  br i1 %.not1719, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %6
  %sext = shl i64 %9, 32
  %11 = ashr exact i64 %sext, 32
  %12 = add i64 %7, 1
  %13 = sub i64 %12, %9
  %wide.trip.count = and i64 %13, 4294967295
  br label %14

._crit_edge:                                      ; preds = %14, %6
  %.013.lcssa = phi i32 [ -1, %6 ], [ %spec.select, %14 ]
  ret i32 %.013.lcssa

14:                                               ; preds = %.lr.ph, %14
  %indvars.iv = phi i64 [ 0, %.lr.ph ], [ %indvars.iv.next, %14 ]
  %.01320 = phi i32 [ -1, %.lr.ph ], [ %spec.select, %14 ]
  %15 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv
  %16 = tail call i32 @strncmp(ptr noundef nonnull %15, ptr noundef nonnull %1, i64 noundef %11) #4
  %.not18 = icmp eq i32 %16, 0
  %17 = trunc nuw nsw i64 %indvars.iv to i32
  %spec.select = select i1 %.not18, i32 %17, i32 %.01320
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge, label %14, !llvm.loop !5
}

attributes #0 = { noreturn nounwind "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 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 = { noreturn nounwind }
attributes #4 = { 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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


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