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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - std::to_chars generates exception code"
href="https://bugs.llvm.org/show_bug.cgi?id=46016">46016</a>
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<th>Summary</th>
<td>std::to_chars generates exception code
</td>
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<th>Product</th>
<td>libc++
</td>
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<th>Version</th>
<td>10.0
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>mail@hanicka.net
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
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<pre>`std::to_chars` is generating exception handling code, because internals
functions are not marked `noexcept` and clang can't proof they won't throw:
```
namespace __itoa {
_LIBCPP_FUNC_VIS char* __u64toa(uint64_t __value, char* __buffer);
_LIBCPP_FUNC_VIS char* __u32toa(uint32_t __value, char* __buffer);
}
```
if you add `noexcept` there it will generate more efficient code:
<a href="https://compiler-explorer.com/z/H29awf">https://compiler-explorer.com/z/H29awf</a></pre>
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