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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 - [X86][AVX512] Strange uitofp v2i64 to v2f32 legalization"
href="https://bugs.llvm.org/show_bug.cgi?id=39205">39205</a>
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<th>Summary</th>
<td>[X86][AVX512] Strange uitofp v2i64 to v2f32 legalization
</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>
<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>Backend: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>llvm-dev@redking.me.uk
</td>
</tr>
<tr>
<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, zvi.rackover@intel.com
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</tr></table>
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<pre><a href="https://gcc.godbolt.org/z/-HRm6i">https://gcc.godbolt.org/z/-HRm6i</a>
Why 3 vcvtusi2ssq entries?
llc -matrr=+avx512f
define <4 x float> @uitofp_2i64_2f32(<2 x i64> %a) {
%cvt = uitofp <2 x i64> %a to <2 x float>
%ext = shufflevector <2 x float> %cvt, <2 x float> undef, <4 x i32> <i32 0,
i32 1, i32 undef, i32 undef>
ret <4 x float> %ext
}
define <4 x float> @uitofp_2i64_4f32(<2 x i64> %a) {
%ext = shufflevector <2 x i64> %a, <2 x i64> undef, <4 x i32> <i32 0, i32 1,
i32 undef, i32 undef>
%cvt = uitofp <4 x i64> %ext to <4 x float>
ret <4 x float> %cvt
}
uitofp_2i64_2f32: # @uitofp_2i64_2f32
vpextrq $1, %xmm0, %rax
vcvtusi2ssq %rax, %xmm1, %xmm1
vmovq %xmm0, %rax
vcvtusi2ssq %rax, %xmm2, %xmm0
vinsertps $16, %xmm1, %xmm0, %xmm0 # xmm0 = xmm0[0],xmm1[0],xmm0[2,3]
vcvtusi2ssq %rax, %xmm2, %xmm1
vshufps $4, %xmm1, %xmm0, %xmm0 # xmm0 = xmm0[0,1],xmm1[0,0]
retq
uitofp_2i64_4f32: # @uitofp_2i64_4f32
vpextrq $1, %xmm0, %rax
vcvtusi2ssq %rax, %xmm1, %xmm1
vmovq %xmm0, %rax
vcvtusi2ssq %rax, %xmm2, %xmm0
vinsertps $16, %xmm1, %xmm0, %xmm0 # xmm0 = xmm0[0],xmm1[0],xmm0[2,3]
vcvtusi2ssq %rax, %xmm2, %xmm1
vshufps $4, %xmm1, %xmm0, %xmm0 # xmm0 = xmm0[0,1],xmm1[0,0]
retq</pre>
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