<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Issue</th>
<td>
<a href=https://github.com/llvm/llvm-project/issues/88768>88768</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>
[libc][math] `sqrt(-infinity)` not setting `errno == EMOD` or raising exceptions
</td>
</tr>
<tr>
<th>Labels</th>
<td>
libc
</td>
</tr>
<tr>
<th>Assignees</th>
<td>
</td>
</tr>
<tr>
<th>Reporter</th>
<td>
Flandini
</td>
</tr>
</table>
<pre>
Following up on #61092, this case still remains.
## Problems:
The ISA-specific implementations aren't setting `errno == EDOM` on negative, non-zero numbers.
The generic implementation and the `sqrt_80_bit_long_double` generic implementation do not set `EDOM` or raise `FE_INVALID`.
## Potential fixes:
Fixes for the generic implementation seem straight forward. I can add a check that the argument is less than zero before the asm sqrt insn in the ISA-specific impls; I would guess the best way to do this is with FPBits to avoid changing FP flags/exceptions?
For the ISA-specific implementations, we could add a check for numbers less than zero before the assembly instruction.
Tagging @nickdesaulniers and @michaelrj-google.
</pre>
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