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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [AArch64][GlobalISel] struct passing with fp16 members"
href="https://bugs.llvm.org/show_bug.cgi?id=36345">36345</a>
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<th>Summary</th>
<td>[AArch64][GlobalISel] struct passing with fp16 members
</td>
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<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>sjoerd.meijer@arm.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Compilation of this:
typedef struct {
__fp16 array[2];
} struct2;
struct2 global_arg0;
void c_test(struct2 arg0) {
global_arg0 = arg0;
}
fails with:
unimplemented reg-to-reg copy
UNREACHABLE executed at
/data/llvmdev/llvm/lib/Target/AArch64/AArch64InstrInfo.cpp:2573!
when e.g. compiled with:
-O0 --target=aarch64-arm-none-eabi -march=armv8-a+simd+fp bug.c -S
Looks like GISel is generating a COPY node:
bb.1.entry:
liveins: $h0, $h1
renamable $x8 = IMPLICIT_DEF
renamable $w9 = COPY killed renamable $h0
...
but this is trying to copy from a 16-bit to a 32-bit register (and COPY works
with equal sized source/destination registers?).</pre>
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