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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - __builtin calls that would have produced integer constants expressions on their own do not produce integer constant when the builtin call is composed across a _Generic selection"
href="https://bugs.llvm.org/show_bug.cgi?id=44684">44684</a>
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<th>Summary</th>
<td>__builtin calls that would have produced integer constants expressions on their own do not produce integer constant when the builtin call is composed across a _Generic selection
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>9.0
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>pskocik@gmail.com
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>These all fail on clang while succeeding on gcc:
_Static_assert(_Generic(1u,unsigned:__builtin_clz)(1u),""); //✗
_Static_assert(_Generic(1u,unsigned:__builtin_popcount)(1u),""); //✗
_Static_assert(_Generic(1u,unsigned:__builtin_ctz)(2u),""); //✗
(Both gcc and clang successfully compile:
_Static_assert(__builtin_clz(1u),""); //✓
_Static_assert(__builtin_popcount(1u),""); //✓
_Static_assert(__builtin_ctz(2u),""); //✓
)
<a href="https://gcc.godbolt.org/z/_CpbSL">https://gcc.godbolt.org/z/_CpbSL</a></pre>
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