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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Better codegen for AVX512 scatter"
href="https://bugs.llvm.org/show_bug.cgi?id=47572">47572</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Better codegen for AVX512 scatter
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</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>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Backend: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>david.bolvansky@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, spatel+llvm@rotateright.com
</td>
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<p>
<div>
<pre>#include <immintrin.h>
void sct(int *data) {
_mm512_mask_i32scatter_epi32(data - 1, 0xffff, _mm512_set1_epi32(1),
_mm512_set1_epi32(1), 1);
}
-O3 -march=skylake-avx512
Clang:
.LCPI0_0:
.long 1 # 0x1
sct(int*): # @sct(int*)
add rdi, -4
kxnorw k1, k0, k0
vpbroadcastd zmm0, dword ptr [rip + .LCPI0_0] # zmm0 =
[1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1]
vpscatterdd zmmword ptr [rdi + zmm0] {k1}, zmm0
vzeroupper
ret
ICC:
sct(int*):
vmovups zmm0, ZMMWORD PTR .L_2il0floatpacket.0[rip] #3.3
vpcmpeqb k1, xmm0, xmm0 #3.3
vpscatterdd DWORD PTR [-4+rdi+zmm0]{k1}, zmm0 #3.3
vzeroupper #4.1
ret #4.1
.L_2il0floatpacket.0:
.long
0x00000001,0x00000001,0x00000001,0x00000001,0x00000001,0x00000001,0x00000001,0x00000001,0x00000001,0x00000001,0x00000001,0x00000001,0x00000001,0x00000001,0x00000001,0x00000001
<a href="https://godbolt.org/z/xKbePG">https://godbolt.org/z/xKbePG</a></pre>
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