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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Clang backend error when using vmax_f16 neon intrinsic"
href="https://bugs.llvm.org/show_bug.cgi?id=42556">42556</a>
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<th>Summary</th>
<td>Clang backend error when using vmax_f16 neon intrinsic
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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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
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Backend: ARM
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>pirama@google.com
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<th>CC</th>
<td>kristof.beyls@arm.com, llvm-bugs@lists.llvm.org, peter.smith@linaro.org, sjoerd.meijer@arm.com, srhines@google.com, Ties.Stuij@arm.com
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<pre>See the attached link: <a href="https://godbolt.org/z/vTp2yV">https://godbolt.org/z/vTp2yV</a>
Source:
$ cat fp16.c
#include <arm_neon.h>
float16x4_t m(float16x4_t a, float16x4_t b) {
return vmax_f16(a, b);
}
Fail: clang -c -O2 -target armv7-linux-eabi -march=armv8.2-a+fp16 -mfpu=neon
Pass: clang -c -O2 -target armv7-linux-eabi -march=armv8.2-a+fp16
-mfpu=neon-fp-armv8
The error message is below:
fatal error: error in backend: Do not know how to split the result of this
operator!
clang-9: error: clang frontend command failed with exit code 70 (use -v to see
invocation)
I think the frontend and backend are inconsistent when dealing with this
intrinsic.
Adding Sjoerd Meijer who has recent changes related to this for comments.</pre>
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