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<body><span class="vcard"><a class="email" href="mailto:sharparrow1@yahoo.com" title="Eli Friedman <sharparrow1@yahoo.com>"> <span class="fn">Eli Friedman</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - big vector causes code explosion (no looping with vector attributes?)"
href="http://llvm.org/bugs/show_bug.cgi?id=17417">bug 17417</a>
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<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>sharparrow1@yahoo.com
</td>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>INVALID
</td>
</tr></table>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - big vector causes code explosion (no looping with vector attributes?)"
href="http://llvm.org/bugs/show_bug.cgi?id=17417#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - big vector causes code explosion (no looping with vector attributes?)"
href="http://llvm.org/bugs/show_bug.cgi?id=17417">bug 17417</a>
from <span class="vcard"><a class="email" href="mailto:sharparrow1@yahoo.com" title="Eli Friedman <sharparrow1@yahoo.com>"> <span class="fn">Eli Friedman</span></a>
</span></b>
<pre>ext_vector_type is supposed to be used to represent a machine vector type or
something like it; the generated code is always straight-line code, with no
loops. If you expect the generated code to contain a loop, you should write a
loop, and it will (hopefully) be vectorized for you. For example:
void foo(float* restrict x, float * restrict y) {
for (unsigned i = 0; i < 800; ++i)
*x++ += *y++;
}
[...]
movups -16(%rdi,%rax,4), %xmm0
movups -16(%rsi,%rax,4), %xmm1
addps %xmm0, %xmm1
movups (%rdi,%rax,4), %xmm0
movups (%rsi,%rax,4), %xmm2
movups %xmm1, -16(%rdi,%rax,4)
addps %xmm0, %xmm2
movups %xmm2, (%rdi,%rax,4)
addq $8, %rax
cmpq $804, %rax ## imm = 0x324
jne LBB0_1
[...]</pre>
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