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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - vget_lane_p64 triggers -Wvector-conversion diagnostic"
href="https://bugs.llvm.org/show_bug.cgi?id=48257">48257</a>
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<th>Summary</th>
<td>vget_lane_p64 triggers -Wvector-conversion diagnostic
</td>
</tr>
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<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>11.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>clang@evan.coeusgroup.com
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
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</tr></table>
<p>
<div>
<pre>vget_lane_p64 is defined in arm_neon.h as:
#define vget_lane_p64(__p0, __p1) __extension__ ({ \
poly64x1_t __s0 = __p0; \
poly64_t __ret; \
__ret = (poly64_t) __builtin_neon_vget_lane_i64((poly64x1_t)__s0, __p1); \
__ret; \
})
Note the cast on the first argument to __builtin_neon_vget_lane_i64;
vget_lane_i64 takes an int64x1_t, not a poly64x1_t, so code which calls this
macro ends up emitting a -Wvector-conversion diagnostic:
error: incompatible vector types passing 'poly64x1_t' (vector of 1 'poly64_t'
value) to parameter of type '__attribute__((__vector_size__(1 * sizeof(long))))
long' (vector of 1 'long' value) [-Werror,-Wvector-conversion]
For an example, you can use:
#include <arm_neon.h>
poly64_t foo (poly64x1_t v);
poly64_t
foo (poly64x1_t v) {
return vget_lane_p64(v, 0);
}
Or, on Compiler Explorer: <a href="https://godbolt.org/z/GWf6fq">https://godbolt.org/z/GWf6fq</a>
It looks like this is a problem on all the vget*_lane_p64 functions.</pre>
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