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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 - Suboptimal codegen for vector init constructor"
href="https://bugs.llvm.org/show_bug.cgi?id=47642">47642</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Suboptimal codegen for vector init constructor
</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>
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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>
</tr></table>
<p>
<div>
<pre>typedef int __v4si __attribute__ ((__vector_size__ (16)));
__v4si
foo (__v4si x, int f)
{
__v4si y = { f, f + 1 , f + 2, f + 3};
return y;
}
Clang -O3:
foo(int __vector(4), int): # @foo(int __vector(4),
int)
lea eax, [rdi + 1]
lea ecx, [rdi + 2]
lea edx, [rdi + 3]
movd xmm0, edx
movd xmm1, ecx
punpckldq xmm1, xmm0 # xmm1 =
xmm1[0],xmm0[0],xmm1[1],xmm0[1]
movd xmm0, edi
movd xmm2, eax
punpckldq xmm0, xmm2 # xmm0 =
xmm0[0],xmm2[0],xmm0[1],xmm2[1]
punpcklqdq xmm0, xmm1 # xmm0 = xmm0[0],xmm1[0]
ret
GCC -O3:
foo(int __vector(4), int):
movd xmm1, edi
pshufd xmm0, xmm1, 0
paddd xmm0, XMMWORD PTR .LC0[rip]
ret
.LC0:
.long 0
.long 1
.long 2
.long 3
<a href="https://godbolt.org/z/TP4c4s">https://godbolt.org/z/TP4c4s</a></pre>
</div>
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