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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - ICE: "Cannot select: X86ISD::SUBV_BROADCAST" with -O3 -march=skx"
href="https://bugs.llvm.org/show_bug.cgi?id=42819">42819</a>
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<tr>
<th>Summary</th>
<td>ICE: "Cannot select: X86ISD::SUBV_BROADCAST" with -O3 -march=skx
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows NT
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>Vsevolod.Livinskij@frtk.ru
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Clang fails with ICE.
Reproducer:
extern int a[], b[];
void c() {
for (int d = 32; d <= 57; d++)
b[d] = a[d] + a[d - 3];
}
Error:
<span class="quote">>$ clang -c -O3 -march=skx small.c</span >
fatal error: error in backend: Cannot select: t116: v2i64 =
X86ISD::SUBV_BROADCAST t113
t113: v4i64 = bitcast t9
t9: v8i32,ch = load<(load 32 from `<8 x i32>* bitcast (i32* getelementptr
inbounds ([0 x i32], [0 x i32]* @a, i64 0, i64 45) to <8 x i32>*)`, align 4,
!tbaa !2)> t0, t156, undef:i64
t156: i64 = X86ISD::Wrapper TargetGlobalAddress:i64<[0 x i32]* @a> + 180
t155: i64 = TargetGlobalAddress<[0 x i32]* @a> + 180
t5: i64 = undef
In function: c
clang-10: error: clang frontend command failed with exit code 70 (use -v to see
invocation)
clang version 10.0.0 (trunk 367162)
Target: x86_64-unknown-linux-gnu
Thread model: posix
LLVM version:
clang version 10.0.0 (trunk 367162)</pre>
</div>
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