Fuzz introspector
For issues and ideas: https://github.com/ossf/fuzz-introspector/issues

Project functions overview

The following table shows data about each function in the project. The functions included in this table correspond to all functions that exist in the executables of the fuzzers. As such, there may be functions that are from third-party libraries.

For further technical details on the meaning of columns in the below table, please see the Glossary .

Func name Functions filename Args Function call depth Reached by Fuzzers Runtime reached by Fuzzers Combined reached by Fuzzers Fuzzers runtime hit Func lines hit % I Count BB Count Cyclomatic complexity Functions reached Reached by functions Accumulated cyclomatic complexity Undiscovered complexity

Fuzzer details

Fuzzer: misc

Call tree

The calltree shows the control flow of the fuzzer. This is overlaid with coverage information to display how much of the potential code a fuzzer can reach is in fact covered at runtime. In the following there is a link to a detailed calltree visualisation as well as a bitmap showing a high-level view of the calltree. For further information about these topics please see the glossary for full calltree and calltree overview

Call tree overview bitmap:

The distribution of callsites in terms of coloring is
Color Runtime hitcount Callsite count Percentage
red 0 9 8.57%
gold [1:9] 43 40.9%
yellow [10:29] 0 0.0%
greenyellow [30:49] 8 7.61%
lawngreen 50+ 45 42.8%
All colors 105 100

Fuzz blockers

The following nodes represent call sites where fuzz blockers occur.

Amount of callsites blocked Calltree index Parent function Callsite Largest blocked function
3 59 validate_ascii_with_err(std::__1::span ) call site: 00059 _ZN6nameof11nameof_enumIN7simdutf10error_codeEEENSt3__19enable_ifIXsr3stdE9is_enum_vIu7__decayIT_EEENS3_17basic_string_viewIcNS3_11char_traitsIcEEEEE4typeES5_
1 37 simdutf::internal::available_implementation_list::begin() const call site: 00037 __cxa_begin_catch
1 50 get_supported_implementations() call site: 00050 abort
1 53 detect(std::__1::span ) call site: 00053 abort
1 56 validate_ascii(std::__1::span ) call site: 00056 abort
1 70 std::__1::basic_string , std::__1::allocator > FNV1A_hash::as_str > >(std::__1::vector > const&) call site: 00070 abort
1 81 simdutf::trim_partial_utf8(char const*, unsigned long) call site: 00081 abort

Runtime coverage analysis

Covered functions
273
Functions that are reachable but not covered
10
Reachable functions
102
Percentage of reachable functions covered
90.2%
NB: The sum of covered functions and functions that are reachable but not covered need not be equal to Reachable functions . This is because the reachability analysis is an approximation and thus at runtime some functions may be covered that are not included in the reachability analysis. This is a limitation of our static analysis capabilities.
Warning: The number of covered functions are larger than the number of reachable functions. This means that there are more functions covered at runtime than are extracted using static analysis. This is likely a result of the static analysis component failing to extract the right call graph or the coverage runtime being compiled with sanitizers in code that the static analysis has not analysed. This can happen if lto/gold is not used in all places that coverage instrumentation is used.
Function name source code lines source lines hit percentage hit

Files reached

filename functions hit
/src/simdutf/fuzz/misc.cpp 7
/src/simdutf/fuzz/helpers/common.h 7
/src/simdutf/src/implementation.cpp 17
/src/simdutf/include/simdutf/implementation.h 4
/src/simdutf/src/simdutf/icelake/implementation.h 1
/src/simdutf/src/simdutf/haswell/implementation.h 1
/src/simdutf/src/simdutf/westmere/implementation.h 1
/src/simdutf/src/simdutf/fallback/implementation.h 1
/src/simdutf/include/simdutf/internal/isadetection.h 3
/src/simdutf/fuzz/helpers/nameof.hpp 1
/src/simdutf/src/scalar/utf16.h 2
/src/simdutf/src/encoding_types.cpp 1
/src/simdutf/src/scalar/swap_bytes.h 1
/src/simdutf/src/scalar/utf8.h 1
/src/simdutf/src/scalar/latin1_to_utf8/latin1_to_utf8.h 1

Fuzzer: base64

Call tree

The calltree shows the control flow of the fuzzer. This is overlaid with coverage information to display how much of the potential code a fuzzer can reach is in fact covered at runtime. In the following there is a link to a detailed calltree visualisation as well as a bitmap showing a high-level view of the calltree. For further information about these topics please see the glossary for full calltree and calltree overview

Call tree overview bitmap:

The distribution of callsites in terms of coloring is
Color Runtime hitcount Callsite count Percentage
red 0 45 21.4%
gold [1:9] 57 27.1%
yellow [10:29] 5 2.38%
greenyellow [30:49] 1 0.47%
lawngreen 50+ 102 48.5%
All colors 210 100

Fuzz blockers

The following nodes represent call sites where fuzz blockers occur.

Amount of callsites blocked Calltree index Parent function Callsite Largest blocked function
4 71 void decode (std::__1::span , simdutf::base64_options, simdutf::last_chunk_handling_options) call site: 00071 _ZN6nameof11nameof_enumIN7simdutf10error_codeEEENSt3__19enable_ifIXsr3stdE9is_enum_vIu7__decayIT_EEENS3_17basic_string_viewIcNS3_11char_traitsIcEEEEE4typeES5_
4 100 simdutf::scalar::(anonymous namespace)::base64::reduced_input simdutf::scalar::(anonymous namespace)::base64::find_end (char const*, unsigned long, simdutf::base64_options) call site: 00100 __clang_call_terminate
4 115 simdutf::full_result simdutf::scalar::(anonymous namespace)::base64::base64_tail_decode_impl (char*, unsigned long, char const*, unsigned long, unsigned long, simdutf::base64_options, simdutf::last_chunk_handling_options) call site: 00115
4 182 simdutf::scalar::(anonymous namespace)::base64::reduced_input simdutf::scalar::(anonymous namespace)::base64::find_end (char16_t const*, unsigned long, simdutf::base64_options) call site: 00182 __clang_call_terminate
4 192 simdutf::full_result simdutf::scalar::(anonymous namespace)::base64::base64_tail_decode_impl (char*, unsigned long, char16_t const*, unsigned long, unsigned long, simdutf::base64_options, simdutf::last_chunk_handling_options) call site: 00192
3 65 void roundtrip (std::__1::span , simdutf::base64_options, simdutf::last_chunk_handling_options) call site: 00065 abort
3 105 simdutf::scalar::(anonymous namespace)::base64::reduced_input simdutf::scalar::(anonymous namespace)::base64::find_end (char const*, unsigned long, simdutf::base64_options) call site: 00105
3 144 simdutf::scalar::(anonymous namespace)::base64::patch_tail_result(simdutf::full_result, unsigned long, unsigned long, unsigned long, unsigned long, simdutf::last_chunk_handling_options) call site: 00144 __clang_call_terminate
2 97 simdutf::result simdutf::base64_to_binary_safe_impl (char const*, unsigned long, char*, unsigned long&, simdutf::base64_options, simdutf::last_chunk_handling_options, bool) call site: 00097
2 171 void decode_safe (std::__1::span , simdutf::base64_options, unsigned long, simdutf::last_chunk_handling_options) call site: 00171 abort
2 174 void decode_safe (std::__1::span , simdutf::base64_options, unsigned long, simdutf::last_chunk_handling_options) call site: 00174 abort
2 179 simdutf::base64_to_binary_safe(char16_t const*, unsigned long, char*, unsigned long&, simdutf::base64_options, simdutf::last_chunk_handling_options, bool) call site: 00179

Runtime coverage analysis

Covered functions
153
Functions that are reachable but not covered
16
Reachable functions
155
Percentage of reachable functions covered
89.68%
NB: The sum of covered functions and functions that are reachable but not covered need not be equal to Reachable functions . This is because the reachability analysis is an approximation and thus at runtime some functions may be covered that are not included in the reachability analysis. This is a limitation of our static analysis capabilities.
Function name source code lines source lines hit percentage hit

Files reached

filename functions hit
/src/simdutf/fuzz/base64.cpp 8
/src/simdutf/fuzz/helpers/common.h 7
/src/simdutf/src/implementation.cpp 26
/src/simdutf/include/simdutf/implementation.h 5
/src/simdutf/src/simdutf/icelake/implementation.h 1
/src/simdutf/src/simdutf/haswell/implementation.h 1
/src/simdutf/src/simdutf/westmere/implementation.h 1
/src/simdutf/src/simdutf/fallback/implementation.h 1
/src/simdutf/include/simdutf/internal/isadetection.h 3
/src/simdutf/src/scalar/base64.h 16
/src/simdutf/fuzz/helpers/nameof.hpp 1
/src/simdutf/include/simdutf/error.h 3
/src/simdutf/src/encoding_types.cpp 1
/src/simdutf/src/scalar/swap_bytes.h 1

Fuzzer: roundtrip

Call tree

The calltree shows the control flow of the fuzzer. This is overlaid with coverage information to display how much of the potential code a fuzzer can reach is in fact covered at runtime. In the following there is a link to a detailed calltree visualisation as well as a bitmap showing a high-level view of the calltree. For further information about these topics please see the glossary for full calltree and calltree overview

Call tree overview bitmap:

The distribution of callsites in terms of coloring is
Color Runtime hitcount Callsite count Percentage
red 0 110 49.3%
gold [1:9] 21 9.41%
yellow [10:29] 3 1.34%
greenyellow [30:49] 2 0.89%
lawngreen 50+ 87 39.0%
All colors 223 100

Fuzz blockers

The following nodes represent call sites where fuzz blockers occur.

Amount of callsites blocked Calltree index Parent function Callsite Largest blocked function
57 42 simdutf::internal::detect_supported_architectures() call site: 00042 printf
6 142 simdutf::full_result simdutf::scalar::(anonymous namespace)::base64::base64_tail_decode_impl (char*, unsigned long, char const*, unsigned long, unsigned long, simdutf::base64_options, simdutf::last_chunk_handling_options) call site: 00142
6 209 LLVMFuzzerTestOneInput call site: 00209 abort
6 216 LLVMFuzzerTestOneInput call site: 00216 printf
4 129 simdutf::scalar::(anonymous namespace)::base64::reduced_input simdutf::scalar::(anonymous namespace)::base64::find_end (char const*, unsigned long, simdutf::base64_options) call site: 00129 __clang_call_terminate
4 153 simdutf::full_result simdutf::scalar::(anonymous namespace)::base64::base64_tail_decode_impl (char*, unsigned long, char const*, unsigned long, unsigned long, simdutf::base64_options, simdutf::last_chunk_handling_options) call site: 00153
3 104 LLVMFuzzerTestOneInput call site: 00104
3 134 simdutf::scalar::(anonymous namespace)::base64::reduced_input simdutf::scalar::(anonymous namespace)::base64::find_end (char const*, unsigned long, simdutf::base64_options) call site: 00134
3 173 simdutf::scalar::(anonymous namespace)::base64::patch_tail_result(simdutf::full_result, unsigned long, unsigned long, unsigned long, unsigned long, simdutf::last_chunk_handling_options) call site: 00173 __clang_call_terminate
3 202 LLVMFuzzerTestOneInput call site: 00202
2 126 simdutf::result simdutf::base64_to_binary_safe_impl (char const*, unsigned long, char*, unsigned long&, simdutf::base64_options, simdutf::last_chunk_handling_options, bool) call site: 00126
2 159 simdutf::full_result simdutf::scalar::(anonymous namespace)::base64::base64_tail_decode_impl (char*, unsigned long, char const*, unsigned long, unsigned long, simdutf::base64_options, simdutf::last_chunk_handling_options) call site: 00159

Runtime coverage analysis

Covered functions
575
Functions that are reachable but not covered
11
Reachable functions
102
Percentage of reachable functions covered
89.22%
NB: The sum of covered functions and functions that are reachable but not covered need not be equal to Reachable functions . This is because the reachability analysis is an approximation and thus at runtime some functions may be covered that are not included in the reachability analysis. This is a limitation of our static analysis capabilities.
Warning: The number of covered functions are larger than the number of reachable functions. This means that there are more functions covered at runtime than are extracted using static analysis. This is likely a result of the static analysis component failing to extract the right call graph or the coverage runtime being compiled with sanitizers in code that the static analysis has not analysed. This can happen if lto/gold is not used in all places that coverage instrumentation is used.
Function name source code lines source lines hit percentage hit

Files reached

filename functions hit
/src/simdutf/fuzz/roundtrip.cpp 2
/src/simdutf/src/implementation.cpp 20
/src/simdutf/include/simdutf/implementation.h 5
/src/simdutf/src/simdutf/icelake/implementation.h 1
/src/simdutf/src/simdutf/haswell/implementation.h 1
/src/simdutf/src/simdutf/westmere/implementation.h 1
/src/simdutf/src/simdutf/fallback/implementation.h 1
/src/simdutf/include/simdutf/internal/isadetection.h 3
/src/simdutf/src/scalar/base64.h 9
/src/simdutf/include/simdutf/error.h 3
/src/simdutf/src/encoding_types.cpp 1
/src/simdutf/src/scalar/swap_bytes.h 1

Fuzzer: conversion

Call tree

The calltree shows the control flow of the fuzzer. This is overlaid with coverage information to display how much of the potential code a fuzzer can reach is in fact covered at runtime. In the following there is a link to a detailed calltree visualisation as well as a bitmap showing a high-level view of the calltree. For further information about these topics please see the glossary for full calltree and calltree overview

Call tree overview bitmap:

The distribution of callsites in terms of coloring is
Color Runtime hitcount Callsite count Percentage
red 0 0 0.0%
gold [1:9] 0 0.0%
yellow [10:29] 0 0.0%
greenyellow [30:49] 0 0.0%
lawngreen 50+ 4 100.%
All colors 4 100

Runtime coverage analysis

Covered functions
1280
Functions that are reachable but not covered
2
Reachable functions
5
Percentage of reachable functions covered
60.0%
NB: The sum of covered functions and functions that are reachable but not covered need not be equal to Reachable functions . This is because the reachability analysis is an approximation and thus at runtime some functions may be covered that are not included in the reachability analysis. This is a limitation of our static analysis capabilities.
Warning: The number of covered functions are larger than the number of reachable functions. This means that there are more functions covered at runtime than are extracted using static analysis. This is likely a result of the static analysis component failing to extract the right call graph or the coverage runtime being compiled with sanitizers in code that the static analysis has not analysed. This can happen if lto/gold is not used in all places that coverage instrumentation is used.
Function name source code lines source lines hit percentage hit

Files reached

filename functions hit
/src/simdutf/fuzz/conversion.cpp 2

Analyses and suggestions

Optimal target analysis

Remaining optimal interesting functions

The following table shows a list of functions that are optimal targets. Optimal targets are identified by finding the functions that in combination, yield a high code coverage.

Func name Functions filename Arg count Args Function depth hitcount instr count bb count cyclomatic complexity Reachable functions Incoming references total cyclomatic complexity Unreached complexity
simdutf::haswell::implementation::base64_to_binary(charconst*,unsignedlong,char*,simdutf::base64_options,simdutf::last_chunk_handling_options)const /src/simdutf/src/haswell/implementation.cpp 6 ['N/A', 'N/A', 'size_t', 'N/A', 'size_t', 'size_t'] 7 0 181 21 21 111 0 464 380
simdutf::westmere::implementation::base64_to_binary(char16_tconst*,unsignedlong,char*,simdutf::base64_options,simdutf::last_chunk_handling_options)const /src/simdutf/src/westmere/implementation.cpp 6 ['N/A', 'N/A', 'size_t', 'N/A', 'size_t', 'size_t'] 7 0 181 21 21 109 0 461 374
simdutf::icelake::implementation::base64_to_binary(charconst*,unsignedlong,char*,simdutf::base64_options,simdutf::last_chunk_handling_options)const /src/simdutf/src/icelake/implementation.cpp 6 ['N/A', 'N/A', 'size_t', 'N/A', 'size_t', 'size_t'] 7 0 181 21 21 71 0 361 299
simdutf::icelake::implementation::base64_to_binary(char16_tconst*,unsignedlong,char*,simdutf::base64_options,simdutf::last_chunk_handling_options)const /src/simdutf/src/icelake/implementation.cpp 6 ['N/A', 'N/A', 'size_t', 'N/A', 'size_t', 'size_t'] 7 0 181 21 21 71 0 361 277
simdutf::westmere::implementation::base64_to_binary(charconst*,unsignedlong,char*,simdutf::base64_options,simdutf::last_chunk_handling_options)const /src/simdutf/src/westmere/implementation.cpp 6 ['N/A', 'N/A', 'size_t', 'N/A', 'size_t', 'size_t'] 7 0 181 21 21 109 0 461 242
simdutf::haswell::implementation::base64_to_binary(char16_tconst*,unsignedlong,char*,simdutf::base64_options,simdutf::last_chunk_handling_options)const /src/simdutf/src/haswell/implementation.cpp 6 ['N/A', 'N/A', 'size_t', 'N/A', 'size_t', 'size_t'] 7 0 181 21 21 111 0 464 242
populate_functions()::$_0::__invoke(std::__1::span ) /src/simdutf/fuzz/conversion.cpp 2 ['N/A', 'size_t'] 10 0 22 3 2 95 0 361 240

Implementing fuzzers that target the above functions will improve reachability such that it becomes:

Functions statically reachable by fuzzers
10.0%
231 / 2268
Cyclomatic complexity statically reachable by fuzzers
19.0%
2934 / 15132

All functions overview

If you implement fuzzers for these functions, the status of all functions in the project will be:

Func name Functions filename Args Function call depth Reached by Fuzzers Runtime reached by Fuzzers Combined reached by Fuzzers Fuzzers runtime hit Func lines hit % I Count BB Count Cyclomatic complexity Functions reached Reached by functions Accumulated cyclomatic complexity Undiscovered complexity

Fuzz engine guidance

This sections provides heuristics that can be used as input to a fuzz engine when running a given fuzz target. The current focus is on providing input that is usable by libFuzzer.

/src/simdutf/fuzz/misc.cpp

Dictionary

Use this with the libFuzzer -dict=DICT.file flag


Fuzzer function priority

Use one of these functions as input to libfuzzer with flag: -focus_function name

-focus_function=['validate_ascii_with_err(std::__1::span)', 'simdutf::internal::available_implementation_list::begin() const', 'get_supported_implementations()', 'detect(std::__1::span)', 'validate_ascii(std::__1::span)', 'std::__1::basic_string, std::__1::allocator > FNV1A_hash::as_str > >(std::__1::vector > const&)', 'simdutf::trim_partial_utf8(char const*, unsigned long)']

/src/simdutf/fuzz/base64.cpp

Dictionary

Use this with the libFuzzer -dict=DICT.file flag


Fuzzer function priority

Use one of these functions as input to libfuzzer with flag: -focus_function name

-focus_function=['void decode(std::__1::span, simdutf::base64_options, simdutf::last_chunk_handling_options)', 'simdutf::scalar::(anonymous namespace)::base64::reduced_input simdutf::scalar::(anonymous namespace)::base64::find_end(char const*, unsigned long, simdutf::base64_options)', 'simdutf::full_result simdutf::scalar::(anonymous namespace)::base64::base64_tail_decode_impl(char*, unsigned long, char const*, unsigned long, unsigned long, simdutf::base64_options, simdutf::last_chunk_handling_options)', 'simdutf::scalar::(anonymous namespace)::base64::reduced_input simdutf::scalar::(anonymous namespace)::base64::find_end(char16_t const*, unsigned long, simdutf::base64_options)', 'simdutf::full_result simdutf::scalar::(anonymous namespace)::base64::base64_tail_decode_impl(char*, unsigned long, char16_t const*, unsigned long, unsigned long, simdutf::base64_options, simdutf::last_chunk_handling_options)', 'void roundtrip(std::__1::span, simdutf::base64_options, simdutf::last_chunk_handling_options)', 'simdutf::scalar::(anonymous namespace)::base64::reduced_input simdutf::scalar::(anonymous namespace)::base64::find_end(char const*, unsigned long, simdutf::base64_options)', 'simdutf::scalar::(anonymous namespace)::base64::patch_tail_result(simdutf::full_result, unsigned long, unsigned long, unsigned long, unsigned long, simdutf::last_chunk_handling_options)', 'simdutf::result simdutf::base64_to_binary_safe_impl(char const*, unsigned long, char*, unsigned long&, simdutf::base64_options, simdutf::last_chunk_handling_options, bool)', 'void decode_safe(std::__1::span, simdutf::base64_options, unsigned long, simdutf::last_chunk_handling_options)']

/src/simdutf/fuzz/roundtrip.cpp

Dictionary

Use this with the libFuzzer -dict=DICT.file flag


Fuzzer function priority

Use one of these functions as input to libfuzzer with flag: -focus_function name

-focus_function=['simdutf::internal::detect_supported_architectures()', 'simdutf::full_result simdutf::scalar::(anonymous namespace)::base64::base64_tail_decode_impl(char*, unsigned long, char const*, unsigned long, unsigned long, simdutf::base64_options, simdutf::last_chunk_handling_options)', 'LLVMFuzzerTestOneInput', 'simdutf::scalar::(anonymous namespace)::base64::reduced_input simdutf::scalar::(anonymous namespace)::base64::find_end(char const*, unsigned long, simdutf::base64_options)', 'simdutf::full_result simdutf::scalar::(anonymous namespace)::base64::base64_tail_decode_impl(char*, unsigned long, char const*, unsigned long, unsigned long, simdutf::base64_options, simdutf::last_chunk_handling_options)', 'simdutf::scalar::(anonymous namespace)::base64::reduced_input simdutf::scalar::(anonymous namespace)::base64::find_end(char const*, unsigned long, simdutf::base64_options)', 'simdutf::scalar::(anonymous namespace)::base64::patch_tail_result(simdutf::full_result, unsigned long, unsigned long, unsigned long, unsigned long, simdutf::last_chunk_handling_options)']

/src/simdutf/fuzz/conversion.cpp

Dictionary

Use this with the libFuzzer -dict=DICT.file flag


Runtime coverage analysis

This section shows analysis of runtime coverage data.

For futher technical details on how this section is generated, please see the Glossary .

Complex functions with low coverage

Func name Function total lines Lines covered at runtime percentage covered Reached by fuzzers
voiddecode (std::__1::span ,simdutf::base64_options,simdutf::last_chunk_handling_options) 35 17 48.57% ['base64']
voiddecode (std::__1::span ,simdutf::base64_options,simdutf::last_chunk_handling_options) 35 17 48.57% ['base64']
unsignedintsimdutf::haswell::(anonymousnamespace)::block64::to_base64_mask (longlong__vector(4)*,unsignedint*) 118 62 52.54% ['base64']
Conversion<(UtfEncodings)0,(UtfEncodings)3,unsignedlong(simdutf::implementation::*)(char16_tconst*,unsignedlong)noexceptconst,unsignedlong(simdutf::implementation::*)(char16_tconst*,unsignedlong,char32_t*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)0,(UtfEncodings)2,unsignedlong(simdutf::implementation::*)(char16_tconst*,unsignedlong)noexceptconst,unsignedlong(simdutf::implementation::*)(char16_tconst*,unsignedlong,char*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)1,(UtfEncodings)3,unsignedlong(simdutf::implementation::*)(char16_tconst*,unsignedlong)noexceptconst,unsignedlong(simdutf::implementation::*)(char16_tconst*,unsignedlong,char32_t*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)1,(UtfEncodings)2,unsignedlong(simdutf::implementation::*)(char16_tconst*,unsignedlong)noexceptconst,unsignedlong(simdutf::implementation::*)(char16_tconst*,unsignedlong,char*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)3,(UtfEncodings)0,unsignedlong(simdutf::implementation::*)(char32_tconst*,unsignedlong)noexceptconst,unsignedlong(simdutf::implementation::*)(char32_tconst*,unsignedlong,char16_t*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)3,(UtfEncodings)1,unsignedlong(simdutf::implementation::*)(char32_tconst*,unsignedlong)noexceptconst,unsignedlong(simdutf::implementation::*)(char32_tconst*,unsignedlong,char16_t*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)3,(UtfEncodings)2,unsignedlong(simdutf::implementation::*)(char32_tconst*,unsignedlong)noexceptconst,unsignedlong(simdutf::implementation::*)(char32_tconst*,unsignedlong,char*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)2,(UtfEncodings)0,unsignedlong(simdutf::implementation::*)(charconst*,unsignedlong)noexceptconst,unsignedlong(simdutf::implementation::*)(charconst*,unsignedlong,char16_t*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)2,(UtfEncodings)1,unsignedlong(simdutf::implementation::*)(charconst*,unsignedlong)noexceptconst,unsignedlong(simdutf::implementation::*)(charconst*,unsignedlong,char16_t*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)2,(UtfEncodings)3,unsignedlong(simdutf::implementation::*)(charconst*,unsignedlong)noexceptconst,unsignedlong(simdutf::implementation::*)(charconst*,unsignedlong,char32_t*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)0,(UtfEncodings)4,unsignedlong(simdutf::implementation::*)(unsignedlong)noexceptconst,unsignedlong(simdutf::implementation::*)(char16_tconst*,unsignedlong,char*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)1,(UtfEncodings)4,unsignedlong(simdutf::implementation::*)(unsignedlong)noexceptconst,unsignedlong(simdutf::implementation::*)(char16_tconst*,unsignedlong,char*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)3,(UtfEncodings)4,unsignedlong(simdutf::implementation::*)(unsignedlong)noexceptconst,unsignedlong(simdutf::implementation::*)(char32_tconst*,unsignedlong,char*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)2,(UtfEncodings)4,unsignedlong(simdutf::implementation::*)(charconst*,unsignedlong)noexceptconst,unsignedlong(simdutf::implementation::*)(charconst*,unsignedlong,char*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)0,(UtfEncodings)4,unsignedlong(simdutf::implementation::*)(unsignedlong)noexceptconst,simdutf::result(simdutf::implementation::*)(char16_tconst*,unsignedlong,char*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)0,(UtfEncodings)3,unsignedlong(simdutf::implementation::*)(char16_tconst*,unsignedlong)noexceptconst,simdutf::result(simdutf::implementation::*)(char16_tconst*,unsignedlong,char32_t*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)0,(UtfEncodings)2,unsignedlong(simdutf::implementation::*)(char16_tconst*,unsignedlong)noexceptconst,simdutf::result(simdutf::implementation::*)(char16_tconst*,unsignedlong,char*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)1,(UtfEncodings)4,unsignedlong(simdutf::implementation::*)(unsignedlong)noexceptconst,simdutf::result(simdutf::implementation::*)(char16_tconst*,unsignedlong,char*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)1,(UtfEncodings)3,unsignedlong(simdutf::implementation::*)(char16_tconst*,unsignedlong)noexceptconst,simdutf::result(simdutf::implementation::*)(char16_tconst*,unsignedlong,char32_t*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)1,(UtfEncodings)2,unsignedlong(simdutf::implementation::*)(char16_tconst*,unsignedlong)noexceptconst,simdutf::result(simdutf::implementation::*)(char16_tconst*,unsignedlong,char*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)3,(UtfEncodings)4,unsignedlong(simdutf::implementation::*)(unsignedlong)noexceptconst,simdutf::result(simdutf::implementation::*)(char32_tconst*,unsignedlong,char*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)3,(UtfEncodings)0,unsignedlong(simdutf::implementation::*)(char32_tconst*,unsignedlong)noexceptconst,simdutf::result(simdutf::implementation::*)(char32_tconst*,unsignedlong,char16_t*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)3,(UtfEncodings)1,unsignedlong(simdutf::implementation::*)(char32_tconst*,unsignedlong)noexceptconst,simdutf::result(simdutf::implementation::*)(char32_tconst*,unsignedlong,char16_t*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)3,(UtfEncodings)2,unsignedlong(simdutf::implementation::*)(char32_tconst*,unsignedlong)noexceptconst,simdutf::result(simdutf::implementation::*)(char32_tconst*,unsignedlong,char*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)2,(UtfEncodings)4,unsignedlong(simdutf::implementation::*)(charconst*,unsignedlong)noexceptconst,simdutf::result(simdutf::implementation::*)(charconst*,unsignedlong,char*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)2,(UtfEncodings)0,unsignedlong(simdutf::implementation::*)(charconst*,unsignedlong)noexceptconst,simdutf::result(simdutf::implementation::*)(charconst*,unsignedlong,char16_t*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)2,(UtfEncodings)1,unsignedlong(simdutf::implementation::*)(charconst*,unsignedlong)noexceptconst,simdutf::result(simdutf::implementation::*)(charconst*,unsignedlong,char16_t*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)2,(UtfEncodings)3,unsignedlong(simdutf::implementation::*)(charconst*,unsignedlong)noexceptconst,simdutf::result(simdutf::implementation::*)(charconst*,unsignedlong,char32_t*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)4,(UtfEncodings)3,unsignedlong(simdutf::implementation::*)(unsignedlong)noexceptconst,unsignedlong(simdutf::implementation::*)(charconst*,unsignedlong,char32_t*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)4,(UtfEncodings)3,unsignedlong(simdutf::implementation::*)(unsignedlong)noexceptconst,unsignedlong(simdutf::implementation::*)(charconst*,unsignedlong,char32_t*)noexceptconst>::do_conversion(std::__1::span ,std::__1::vector >const&,bool)const 81 43 53.08% ['conversion']
Conversion<(UtfEncodings)4,(UtfEncodings)0,unsignedlong(simdutf::implementation::*)(unsignedlong)noexceptconst,unsignedlong(simdutf::implementation::*)(charconst*,unsignedlong,char16_t*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)4,(UtfEncodings)0,unsignedlong(simdutf::implementation::*)(unsignedlong)noexceptconst,unsignedlong(simdutf::implementation::*)(charconst*,unsignedlong,char16_t*)noexceptconst>::do_conversion(std::__1::span ,std::__1::vector >const&,bool)const 81 43 53.08% ['conversion']
Conversion<(UtfEncodings)4,(UtfEncodings)1,unsignedlong(simdutf::implementation::*)(unsignedlong)noexceptconst,unsignedlong(simdutf::implementation::*)(charconst*,unsignedlong,char16_t*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)4,(UtfEncodings)1,unsignedlong(simdutf::implementation::*)(unsignedlong)noexceptconst,unsignedlong(simdutf::implementation::*)(charconst*,unsignedlong,char16_t*)noexceptconst>::do_conversion(std::__1::span ,std::__1::vector >const&,bool)const 81 43 53.08% ['conversion']
Conversion<(UtfEncodings)4,(UtfEncodings)2,unsignedlong(simdutf::implementation::*)(charconst*,unsignedlong)noexceptconst,unsignedlong(simdutf::implementation::*)(charconst*,unsignedlong,char*)noexceptconst>::calculate_length(std::__1::span ,bool)const 34 17 50.0% ['conversion']
Conversion<(UtfEncodings)4,(UtfEncodings)2,unsignedlong(simdutf::implementation::*)(charconst*,unsignedlong)noexceptconst,unsignedlong(simdutf::implementation::*)(charconst*,unsignedlong,char*)noexceptconst>::do_conversion(std::__1::span ,std::__1::vector >const&,bool)const 81 43 53.08% ['conversion']

Files and Directories in report

This section shows which files and directories are considered in this report. The main reason for showing this is fuzz introspector may include more code in the reasoning than is desired. This section helps identify if too many files/directories are included, e.g. third party code, which may be irrelevant for the threat model. In the event too much is included, fuzz introspector supports a configuration file that can exclude data from the report. See the following link for more information on how to create a config file: link

Files in report

Source file Reached by Covered by
[] []
/src/simdutf/src/simdutf/haswell/simd32-inl.h [] []
/src/simdutf/src/icelake/icelake_convert_utf32_to_utf16.inl.cpp [] []
/src/simdutf/src/westmere/sse_convert_utf8_to_latin1.cpp [] []
/src/simdutf/src/generic/utf8_validation/utf8_lookup4_algorithm.h [] []
/src/simdutf/src/haswell/avx2_convert_utf32_to_utf16.cpp [] []
/src/simdutf/src/simdutf/westmere/simd.h [] []
/src/simdutf/src/scalar/latin1.h [] []
/src/simdutf/src/icelake/icelake_find.inl.cpp [] []
/src/simdutf/src/scalar/latin1_to_utf8/latin1_to_utf8.h ['misc'] ['misc']
/src/simdutf/src/generic/validate_utf32.h [] []
/src/simdutf/src/scalar/atomic_util.h [] []
/src/simdutf/src/icelake/icelake_convert_latin1_to_utf32.inl.cpp [] []
/src/simdutf/src/generic/utf8_to_latin1/valid_utf8_to_latin1.h [] []
/src/simdutf/src/haswell/avx2_validate_utf16.cpp [] []
/src/simdutf/src/simdutf/westmere/implementation.h ['misc', 'base64', 'roundtrip'] ['misc', 'base64', 'roundtrip']
/src/simdutf/src/simdutf/icelake/simd32-inl.h [] []
/src/simdutf/src/haswell/avx2_convert_utf32_to_utf8.cpp [] []
/src/simdutf/src/scalar/utf16.h ['misc'] ['misc']
/src/simdutf/src/scalar/utf32_to_latin1/utf32_to_latin1.h [] []
/src/simdutf/fuzz/helpers/nameof.hpp ['misc', 'base64'] []
/src/simdutf/src/scalar/utf16_to_utf8/utf16_to_utf8.h [] []
/src/simdutf/src/westmere/sse_convert_latin1_to_utf8.cpp [] []
/src/simdutf/src/westmere/sse_utf16fix.cpp [] []
/src/simdutf/src/scalar/utf32_to_utf16/valid_utf32_to_utf16.h [] []
/src/simdutf/src/westmere/implementation.cpp [] []
/src/simdutf/src/scalar/utf8_to_latin1/utf8_to_latin1.h [] []
/src/simdutf/src/scalar/utf16_to_latin1/utf16_to_latin1.h [] []
/src/simdutf/src/scalar/utf32_to_latin1/valid_utf32_to_latin1.h [] []
/work/include/simdutf/error.h [] []
/src/simdutf/src/simdutf/icelake/bitmanipulation.h [] []
/src/simdutf/src/icelake/icelake_base64.inl.cpp [] []
/src/simdutf/src/westmere/sse_convert_utf16_to_latin1.cpp [] []
/src/simdutf/src/haswell/avx2_convert_latin1_to_utf8.cpp [] []
/src/simdutf/include/simdutf/internal/isadetection.h ['misc', 'base64', 'roundtrip'] ['misc', 'base64', 'roundtrip']
/src/simdutf/src/simdutf/westmere/simd16-inl.h [] []
/src/simdutf/src/scalar/utf16_to_utf32/utf16_to_utf32.h [] []
/src/simdutf/src/haswell/avx2_convert_utf16_to_utf8.cpp [] []
/src/simdutf/src/icelake/icelake_convert_utf32_to_utf8.inl.cpp [] []
/src/simdutf/src/generic/utf8/utf16_length_from_utf8_bytemask.h [] []
/src/simdutf/src/scalar/utf32_to_utf8/utf32_to_utf8.h [] []
/src/simdutf/src/westmere/sse_convert_latin1_to_utf32.cpp [] []
/src/simdutf/src/simdutf/haswell/simd16-inl.h [] []
/src/simdutf/src/haswell/avx2_convert_utf8_to_latin1.cpp [] []
/src/simdutf/fuzz/base64.cpp ['base64'] ['base64']
/src/simdutf/src/westmere/sse_convert_latin1_to_utf16.cpp [] []
/src/simdutf/src/haswell/avx2_convert_utf8_to_utf32.cpp [] []
/src/simdutf/src/icelake/icelake_convert_latin1_to_utf16.inl.cpp [] []
/src/simdutf/src/generic/utf8_to_utf32/utf8_to_utf32.h [] []
/src/simdutf/src/scalar/base64.h ['base64', 'roundtrip'] ['base64', 'roundtrip']
/src/simdutf/src/simdutf/haswell/simd64-inl.h [] []
/src/simdutf/src/haswell/avx2_convert_utf32_to_latin1.cpp [] []
/src/simdutf/src/generic/base64.h [] []
/usr/local/bin/../include/c++/v1/__functional/perfect_forward.h [] []
/src/simdutf/src/scalar/utf16_to_utf32/valid_utf16_to_utf32.h [] []
/src/simdutf/src/westmere/sse_convert_utf32_to_utf8.cpp [] []
/src/simdutf/src/haswell/avx2_convert_utf16_to_latin1.cpp [] []
/src/simdutf/src/simdutf/haswell/bitmanipulation.h [] []
/src/simdutf/src/generic/utf16/utf8_length_from_utf16_bytemask.h [] []
/src/simdutf/src/generic/utf32.h [] []
/src/simdutf/src/icelake/icelake_utf32_validation.inl.cpp [] []
/src/simdutf/src/simdutf/icelake/simd16-inl.h [] []
/src/simdutf/src/scalar/utf16_to_utf8/valid_utf16_to_utf8.h [] []
/src/simdutf/src/scalar/latin1_to_utf16/latin1_to_utf16.h [] []
/src/simdutf/src/haswell/avx2_utf16fix.cpp [] []
/src/simdutf/src/simdutf/westmere/simd64-inl.h [] []
/usr/local/bin/../include/c++/v1/stdexcept [] []
/src/simdutf/src/icelake/icelake_common.inl.cpp [] []
/src/simdutf/fuzz/roundtrip.cpp ['roundtrip'] ['roundtrip']
/src/simdutf/src/simdutf/fallback/implementation.h ['misc', 'base64', 'roundtrip'] ['misc', 'base64', 'roundtrip']
/src/simdutf/src/haswell/avx2_convert_latin1_to_utf16.cpp [] []
/src/simdutf/src/scalar/utf32_to_utf16/utf32_to_utf16.h [] []
/src/simdutf/src/westmere/sse_convert_utf8_to_utf32.cpp [] []
/src/simdutf/src/generic/utf16.h [] []
/src/simdutf/src/icelake/icelake_utf8_common.inl.cpp [] []
/src/simdutf/src/generic/utf8_to_utf32/valid_utf8_to_utf32.h [] []
/src/simdutf/src/haswell/avx2_base64.cpp [] []
/src/simdutf/src/scalar/utf8_to_utf16/utf8_to_utf16.h [] []
/src/simdutf/src/generic/utf8_to_latin1/utf8_to_latin1.h [] []
/src/simdutf/src/icelake/icelake_convert_valid_utf8_to_latin1.inl.cpp [] []
/src/simdutf/src/generic/utf8.h [] []
/src/simdutf/src/generic/buf_block_reader.h [] []
/src/simdutf/src/generic/find.h [] []
/src/simdutf/src/scalar/utf8_to_utf32/valid_utf8_to_utf32.h [] []
/src/simdutf/src/scalar/utf16_to_latin1/valid_utf16_to_latin1.h [] []
/src/simdutf/src/icelake/icelake_utf8_validation.inl.cpp [] []
/src/simdutf/src/westmere/sse_convert_utf16_to_utf32.cpp [] []
/src/simdutf/src/westmere/sse_convert_utf32_to_latin1.cpp [] []
/src/simdutf/src/westmere/sse_validate_utf16.cpp [] []
/src/simdutf/include/simdutf/implementation.h ['misc', 'base64', 'roundtrip'] ['misc', 'base64', 'roundtrip']
/src/simdutf/src/icelake/icelake_convert_utf16_to_utf32.inl.cpp [] []
/src/simdutf/src/icelake/icelake_convert_utf16_to_utf8.inl.cpp [] []
/src/simdutf/fuzz/helpers/common.h ['misc', 'base64'] ['misc', 'base64']
/src/simdutf/src/generic/utf8_validation/utf8_validator.h [] []
/src/simdutf/src/haswell/avx2_convert_utf8_to_utf16.cpp [] []
/src/simdutf/src/scalar/utf8_to_utf16/valid_utf8_to_utf16.h [] []
/src/simdutf/src/generic/utf8_to_utf16/utf8_to_utf16.h [] []
/src/simdutf/src/implementation.cpp ['misc', 'base64', 'roundtrip'] ['misc', 'base64', 'roundtrip']
/src/simdutf/src/westmere/sse_convert_utf16_to_utf8.cpp [] []
/src/simdutf/src/scalar/ascii.h [] []
/src/simdutf/src/simdutf/haswell/implementation.h ['misc', 'base64', 'roundtrip'] ['misc', 'base64', 'roundtrip']
/src/simdutf/src/simdutf/icelake/implementation.h ['misc', 'base64', 'roundtrip'] ['misc', 'base64', 'roundtrip']
/src/simdutf/src/icelake/icelake_convert_utf32_to_latin1.inl.cpp [] []
/src/simdutf/src/scalar/utf8_to_utf32/utf8_to_utf32.h [] []
/src/simdutf/src/westmere/sse_convert_utf32_to_utf16.cpp [] []
/src/simdutf/src/icelake/icelake_ascii_validation.inl.cpp [] []
/src/simdutf/src/scalar/latin1_to_utf32/latin1_to_utf32.h [] []
/src/simdutf/src/westmere/internal/write_v_u16_11bits_to_utf8.cpp [] []
/src/simdutf/src/scalar/utf32.h [] []
/src/simdutf/src/icelake/icelake_convert_utf16_to_latin1.inl.cpp [] []
/src/simdutf/src/icelake/icelake_from_utf8.inl.cpp [] []
/src/simdutf/src/generic/utf8_to_utf16/valid_utf8_to_utf16.h [] []
/src/simdutf/src/scalar/utf8.h ['misc'] ['misc']
/src/simdutf/src/scalar/utf8_to_latin1/valid_utf8_to_latin1.h [] []
/src/simdutf/src/simdutf/westmere/bitmanipulation.h [] []
/src/simdutf/src/westmere/sse_convert_utf8_to_utf16.cpp [] []
/src/simdutf/src/encoding_types.cpp ['misc', 'base64', 'roundtrip'] ['misc', 'base64', 'roundtrip']
/src/simdutf/src/simdutf/haswell/simd.h [] []
/src/simdutf/src/fallback/implementation.cpp [] []
/src/simdutf/src/icelake/implementation.cpp [] []
/src/simdutf/include/simdutf/error.h ['base64', 'roundtrip'] ['base64', 'roundtrip']
/src/simdutf/src/westmere/sse_base64.cpp [] []
/src/simdutf/src/scalar/utf32_to_utf8/valid_utf32_to_utf8.h [] []
/src/simdutf/fuzz/misc.cpp ['misc'] ['misc']
/usr/local/bin/../include/c++/v1/string [] []
/src/simdutf/src/simdutf/westmere/simd32-inl.h [] []
/src/simdutf/src/icelake/icelake_utf16fix.cpp [] []
/src/simdutf/src/haswell/avx2_convert_utf16_to_utf32.cpp [] []
/src/simdutf/fuzz/conversion.cpp ['conversion'] ['conversion']
/src/simdutf/src/generic/ascii_validation.h [] []
/src/simdutf/src/icelake/icelake_utf8_length_from_utf16.inl.cpp [] []
/src/simdutf/src/icelake/icelake_from_valid_utf8.inl.cpp [] []
/src/simdutf/src/generic/validate_utf16.h [] []
/src/simdutf/src/icelake/icelake_convert_latin1_to_utf8.inl.cpp [] []
/src/simdutf/src/scalar/swap_bytes.h ['misc', 'base64', 'roundtrip'] ['misc', 'base64', 'roundtrip']
/src/simdutf/src/icelake/icelake_convert_utf8_to_latin1.inl.cpp [] []
/src/simdutf/src/haswell/avx2_convert_latin1_to_utf32.cpp [] []
/src/simdutf/src/haswell/implementation.cpp [] []
/src/simdutf/src/icelake/icelake_convert_utf8_to_utf16.inl.cpp [] []

Directories in report

Directory
/src/simdutf/src/scalar/utf32_to_utf8/
/src/simdutf/src/simdutf/icelake/
/src/simdutf/src/scalar/utf8_to_utf16/
/src/simdutf/src/generic/utf8_validation/
/src/simdutf/src/simdutf/haswell/
/src/simdutf/src/scalar/utf16_to_latin1/
/src/simdutf/fuzz/helpers/
/src/simdutf/src/scalar/
/src/simdutf/src/scalar/utf8_to_latin1/
/src/simdutf/src/scalar/utf16_to_utf8/
/src/simdutf/src/scalar/utf32_to_latin1/
/src/simdutf/src/generic/utf8_to_utf32/
/src/simdutf/src/westmere/internal/
/src/simdutf/src/haswell/
/src/simdutf/src/simdutf/fallback/
/src/simdutf/src/simdutf/westmere/
/src/simdutf/src/
/src/simdutf/src/generic/
/src/simdutf/src/scalar/utf16_to_utf32/
/src/simdutf/fuzz/
/src/simdutf/src/scalar/latin1_to_utf32/
/src/simdutf/include/simdutf/
/work/include/simdutf/
/src/simdutf/src/generic/utf8_to_latin1/
/src/simdutf/src/westmere/
/src/simdutf/src/scalar/latin1_to_utf8/
/src/simdutf/include/simdutf/internal/
/src/simdutf/src/generic/utf8_to_utf16/
/usr/local/bin/../include/c++/v1/
/src/simdutf/src/scalar/latin1_to_utf16/
/src/simdutf/src/generic/utf8/
/src/simdutf/src/icelake/
/src/simdutf/src/scalar/utf8_to_utf32/
/src/simdutf/src/scalar/utf32_to_utf16/
/src/simdutf/src/generic/utf16/
/usr/local/bin/../include/c++/v1/__functional/
/src/simdutf/src/fallback/