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<body><span class="vcard"><a class="email" href="mailto:hfinkel@anl.gov" title="Hal Finkel <hfinkel@anl.gov>"> <span class="fn">Hal Finkel</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - use fsel to avoid branch and compare (PPC, fast-math)"
href="http://llvm.org/bugs/show_bug.cgi?id=21231">bug 21231</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;">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 - use fsel to avoid branch and compare (PPC, fast-math)"
href="http://llvm.org/bugs/show_bug.cgi?id=21231#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - use fsel to avoid branch and compare (PPC, fast-math)"
href="http://llvm.org/bugs/show_bug.cgi?id=21231">bug 21231</a>
from <span class="vcard"><a class="email" href="mailto:hfinkel@anl.gov" title="Hal Finkel <hfinkel@anl.gov>"> <span class="fn">Hal Finkel</span></a>
</span></b>
<pre>The problem here is that using fsel for the select_cc nodes here is safe only
if we assume no-NaNs and no-Infs. If you run the test with
-enable-no-infs-fp-math -enable-no-nans-fp-math also, then you'll see:
.L.goo3:
# BB#0:
frsqrtes 0, 1
addis 3, 2, .LCPI0_0@toc@ha
fneg 13, 1
lfs 2, .LCPI0_0@toc@l(3)
addis 3, 2, .LCPI0_1@toc@ha
lfs 12, .LCPI0_1@toc@l(3)
fnmsubs 3, 1, 2, 1
fmuls 4, 0, 0
fmadds 2, 3, 4, 2
fmuls 0, 0, 2
fmuls 0, 1, 0
fsel 2, 1, 12, 0
fsel 1, 13, 2, 0
blr</pre>
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