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<body><span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Clang can not detect runtime error of invalid float cast"
href="https://bugs.llvm.org/show_bug.cgi?id=46095">bug 46095</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>INVALID
</td>
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<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Clang can not detect runtime error of invalid float cast"
href="https://bugs.llvm.org/show_bug.cgi?id=46095#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Clang can not detect runtime error of invalid float cast"
href="https://bugs.llvm.org/show_bug.cgi?id=46095">bug 46095</a>
from <span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span></b>
<pre>This was an intentional change. Between Clang 8 and Clang 9, we changed the
range of representable values of floating-point types from [-max, +max] to
[-inf, +inf], so there is no longer any undefined behavior when converting
between floating-point types in Clang.
This is documented at
<a href="https://clang.llvm.org/docs/UndefinedBehaviorSanitizer.html#available-checks">https://clang.llvm.org/docs/UndefinedBehaviorSanitizer.html#available-checks</a>:
"""
-fsanitize=float-cast-overflow: Conversion to, from, or between floating-point
types which would overflow the destination. Because the range of representable
values for all floating-point types supported by Clang is [-inf, +inf], the
only cases detected are conversions from floating point to integer types.
"""
Converting 1e51 from double to float is valid since Clang 9, and produces +inf.
This is working as intended.</pre>
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