; 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_starts_with = external hidden unnamed_addr constant [50 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: inlinehint nounwind uwtable
define dso_local zeroext i1 @str_starts_with(ptr noundef %0, ptr noundef %1) #2 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !5
  %6 = load ptr, ptr %3, align 8, !tbaa !5
  %7 = icmp ne ptr %6, null
  br i1 %7, label %8, label %9

8:                                                ; preds = %2
  br label %10

9:                                                ; preds = %2
  call void @__assert_fail(ptr noundef @.str.7, ptr noundef @.str.1, i32 noundef 545, ptr noundef @__PRETTY_FUNCTION__.str_starts_with) #3
  unreachable

10:                                               ; preds = %8
  %11 = load ptr, ptr %4, align 8, !tbaa !5
  %12 = icmp ne ptr %11, null
  br i1 %12, label %13, label %14

13:                                               ; preds = %10
  br label %15

14:                                               ; preds = %10
  call void @__assert_fail(ptr noundef @.str.8, ptr noundef @.str.1, i32 noundef 546, ptr noundef @__PRETTY_FUNCTION__.str_starts_with) #3
  unreachable

15:                                               ; preds = %13
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #4
  store i32 0, ptr %5, align 4, !tbaa !9
  br label %16

16:                                               ; preds = %40, %15
  %17 = load ptr, ptr %3, align 8, !tbaa !5
  %18 = load i32, ptr %5, align 4, !tbaa !9
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds i8, ptr %17, i64 %19
  %21 = load i8, ptr %20, align 1, !tbaa !11
  %22 = sext i8 %21 to i32
  %23 = load ptr, ptr %4, align 8, !tbaa !5
  %24 = load i32, ptr %5, align 4, !tbaa !9
  %25 = sext i32 %24 to i64
  %26 = getelementptr inbounds i8, ptr %23, i64 %25
  %27 = load i8, ptr %26, align 1, !tbaa !11
  %28 = sext i8 %27 to i32
  %29 = icmp eq i32 %22, %28
  br i1 %29, label %30, label %38

30:                                               ; preds = %16
  %31 = load ptr, ptr %4, align 8, !tbaa !5
  %32 = load i32, ptr %5, align 4, !tbaa !9
  %33 = sext i32 %32 to i64
  %34 = getelementptr inbounds i8, ptr %31, i64 %33
  %35 = load i8, ptr %34, align 1, !tbaa !11
  %36 = sext i8 %35 to i32
  %37 = icmp ne i32 %36, 0
  br label %38

38:                                               ; preds = %30, %16
  %39 = phi i1 [ false, %16 ], [ %37, %30 ]
  br i1 %39, label %40, label %43

40:                                               ; preds = %38
  %41 = load i32, ptr %5, align 4, !tbaa !9
  %42 = add nsw i32 %41, 1
  store i32 %42, ptr %5, align 4, !tbaa !9
  br label %16, !llvm.loop !12

43:                                               ; preds = %38
  %44 = load ptr, ptr %4, align 8, !tbaa !5
  %45 = load i32, ptr %5, align 4, !tbaa !9
  %46 = sext i32 %45 to i64
  %47 = getelementptr inbounds i8, ptr %44, i64 %46
  %48 = load i8, ptr %47, align 1, !tbaa !11
  %49 = sext i8 %48 to i32
  %50 = icmp eq i32 %49, 0
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #4
  ret i1 %50
}

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 = { inlinehint 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 }

!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 = !{!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"

@.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_starts_with = external hidden unnamed_addr constant [50 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: inlinehint nounwind uwtable
define dso_local zeroext i1 @str_starts_with(ptr noundef readonly %0, ptr noundef readonly %1) local_unnamed_addr #1 {
  %.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 545, ptr noundef nonnull @__PRETTY_FUNCTION__.str_starts_with) #2
  unreachable

4:                                                ; preds = %2
  %.not13 = icmp eq ptr %1, null
  br i1 %.not13, label %5, label %.preheader

5:                                                ; preds = %4
  tail call void @__assert_fail(ptr noundef nonnull @.str.8, ptr noundef nonnull @.str.1, i32 noundef 546, ptr noundef nonnull @__PRETTY_FUNCTION__.str_starts_with) #2
  unreachable

.preheader:                                       ; preds = %4, %.preheader
  %indvars.iv = phi i64 [ %indvars.iv.next, %.preheader ], [ 0, %4 ]
  %6 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv
  %7 = load i8, ptr %6, align 1, !tbaa !5
  %8 = getelementptr inbounds i8, ptr %1, i64 %indvars.iv
  %9 = load i8, ptr %8, align 1, !tbaa !5
  %10 = icmp ne i8 %7, %9
  %.not14 = icmp eq i8 %9, 0
  %or.cond = or i1 %10, %.not14
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  br i1 %or.cond, label %.critedge, label %.preheader, !llvm.loop !8

.critedge:                                        ; preds = %.preheader
  ret i1 %.not14
}

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 = { inlinehint 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 = { noreturn 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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


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