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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - arm_neon.h should include arm_fp16.h"
href="https://bugs.llvm.org/show_bug.cgi?id=47955">47955</a>
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<th>Summary</th>
<td>arm_neon.h should include arm_fp16.h
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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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>Headers
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>david.tellenbach@arm.com
</td>
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<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>Hi,
the Arm ACLE
(<a href="https://developer.arm.com/documentation/101028/0012/3--C-language-extensions">https://developer.arm.com/documentation/101028/0012/3--C-language-extensions</a>)
states that
"<arm_fp16.h> is provided to define the scalar 16-bit floating point arithmetic
intrinsics. As these intrinsics are in the user namespace, an implementation
would not normally define them until the header is included. The
__ARM_FEATURE_FP16_SCALAR_ARITHMETIC feature macro should be tested before
including the header:
#ifdef __ARM_FEATURE_FP16_SCALAR_ARITHMETIC
#include <arm_fp16.h>
#endif /* __ARM_FEATURE_FP16_SCALAR_ARITHMETIC */
Including <arm_neon.h> will also cause <arm_fp16.h> to be included if
appropriate."
Currently our arm_neon.h doesn't include arm_fp16.h. This causes e.g. the
following to fail:
#include <arm_neon.h>
int main() {
#if defined(__ARM_FEATURE_FP16_SCALAR_ARITHMETIC)
__fp16 a = 2;
__fp16 b = 3;
__fp16 c = vaddh_f16(a, b);
#endif
}
with
error: use of undeclared identifier 'vaddh_f16'
__fp16 c = vaddh_f16(a, b);</pre>
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