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<body><span class="vcard"><a class="email" href="mailto:llvm-dev@redking.me.uk" title="Simon Pilgrim <llvm-dev@redking.me.uk>"> <span class="fn">Simon Pilgrim</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - vector truncation generates pretty terrible code without ssse3"
href="http://llvm.org/bugs/show_bug.cgi?id=15524">bug 15524</a>
<br>
<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
</tr>
<tr>
<td style="text-align:right;">CC</td>
<td>
</td>
<td>llvm-dev@redking.me.uk
</td>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
</td>
</tr></table>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - vector truncation generates pretty terrible code without ssse3"
href="http://llvm.org/bugs/show_bug.cgi?id=15524#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - vector truncation generates pretty terrible code without ssse3"
href="http://llvm.org/bugs/show_bug.cgi?id=15524">bug 15524</a>
from <span class="vcard"><a class="email" href="mailto:llvm-dev@redking.me.uk" title="Simon Pilgrim <llvm-dev@redking.me.uk>"> <span class="fn">Simon Pilgrim</span></a>
</span></b>
<pre>Fixed in ToT:
define i64 @trunc(<4 x i32> %inval) {
entry:
%0 = trunc <4 x i32> %inval to <4 x i16>
%1 = bitcast <4 x i16> %0 to i64
ret i64 %1
}
generates
pshuflw $-24, %xmm0, %xmm0 ## xmm0 = xmm0[0,2,2,3,4,5,6,7]
pshufhw $-24, %xmm0, %xmm0 ## xmm0 = xmm0[0,1,2,3,4,6,6,7]
pshufd $-24, %xmm0, %xmm0 ## xmm0 = xmm0[0,2,2,3]
movd %xmm0, %rax
retq
define i64 @trunc(<8 x i16> %inval) {
entry:
%0 = trunc <8 x i16> %inval to <8 x i8>
%1 = bitcast <8 x i8> %0 to i64
ret i64 %1
}
generates
pand LCPI1_0(%rip), %xmm0
packuswb %xmm0, %xmm0
movd %xmm0, %rax
retq</pre>
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