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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [X86][SSE] Add ISD::MULHS/MULHU vXi64 support"
href="https://bugs.llvm.org/show_bug.cgi?id=38423">38423</a>
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<th>Summary</th>
<td>[X86][SSE] Add ISD::MULHS/MULHU vXi64 support
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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>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: X86
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>llvm-dev@redking.me.uk
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<th>CC</th>
<td>andrea.dibiagio@gmail.com, craig.topper@gmail.com, lebedev.ri@gmail.com, llvm-bugs@lists.llvm.org, spatel+llvm@rotateright.com
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<pre>I haven't thoroughly tested this but MULHU should be something like:
define <2 x i64> @mulh_2u64(<2 x i64>, <2 x i64>) {
%3 = and <2 x i64> %0, <i64 4294967295, i64 4294967295>
%4 = lshr <2 x i64> %0, <i64 32, i64 32>
%5 = and <2 x i64> %1, <i64 4294967295, i64 4294967295>
%6 = lshr <2 x i64> %1, <i64 32, i64 32>
%7 = mul nuw <2 x i64> %6, %4
%8 = mul nuw <2 x i64> %5, %4
%9 = mul nuw <2 x i64> %6, %3
%10 = mul nuw <2 x i64> %5, %3
%11 = and <2 x i64> %8, <i64 4294967295, i64 4294967295>
%12 = and <2 x i64> %9, <i64 4294967295, i64 4294967295>
%13 = add nuw nsw <2 x i64> %11, %12
%14 = lshr <2 x i64> %10, <i64 32, i64 32>
%15 = add nuw nsw <2 x i64> %13, %14
%16 = lshr <2 x i64> %15, <i64 32, i64 32>
%17 = lshr <2 x i64> %8, <i64 32, i64 32>
%18 = add <2 x i64> %17, %7
%19 = lshr <2 x i64> %9, <i64 32, i64 32>
%20 = add <2 x i64> %18, %19
%21 = add <2 x i64> %20, %16
ret <2 x i64> %21
}
mulh_2u64:
vpxor %xmm2, %xmm2, %xmm2
vpblendw $204, %xmm2, %xmm0, %xmm3 # xmm3 =
xmm0[0,1],xmm2[2,3],xmm0[4,5],xmm2[6,7]
vpblendw $204, %xmm2, %xmm1, %xmm4 # xmm4 =
xmm1[0,1],xmm2[2,3],xmm1[4,5],xmm2[6,7]
vpsrlq $32, %xmm0, %xmm0
vpsrlq $32, %xmm1, %xmm1
vpmuludq %xmm0, %xmm1, %xmm5
vpmuludq %xmm3, %xmm1, %xmm1
vpmuludq %xmm0, %xmm4, %xmm0
vpmuludq %xmm3, %xmm4, %xmm3
vpblendw $204, %xmm2, %xmm0, %xmm4 # xmm4 =
xmm0[0,1],xmm2[2,3],xmm0[4,5],xmm2[6,7]
vpblendw $204, %xmm2, %xmm1, %xmm2 # xmm2 =
xmm1[0,1],xmm2[2,3],xmm1[4,5],xmm2[6,7]
vpsrlq $32, %xmm0, %xmm0
vpsrlq $32, %xmm3, %xmm3
vpsrlq $32, %xmm1, %xmm1
vpaddq %xmm2, %xmm4, %xmm2
vpaddq %xmm5, %xmm0, %xmm0
vpaddq %xmm3, %xmm2, %xmm2
vpaddq %xmm1, %xmm0, %xmm0
vpsrlq $32, %xmm2, %xmm2
vpaddq %xmm2, %xmm0, %xmm0
retq</pre>
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