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<body><span class="vcard"><a class="email" href="mailto:atrick@apple.com" title="Andrew Trick <atrick@apple.com>"> <span class="fn">Andrew Trick</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - SEGV: SCEV back-edge info invalid after dead code removal."
href="http://llvm.org/bugs/show_bug.cgi?id=15570">bug 15570</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
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<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
</td>
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<td style="text-align:right;">Assignee</td>
<td>unassignedbugs@nondot.org
</td>
<td>atrick@apple.com
</td>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - SEGV: SCEV back-edge info invalid after dead code removal."
href="http://llvm.org/bugs/show_bug.cgi?id=15570#c6">Comment # 6</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - SEGV: SCEV back-edge info invalid after dead code removal."
href="http://llvm.org/bugs/show_bug.cgi?id=15570">bug 15570</a>
from <span class="vcard"><a class="email" href="mailto:atrick@apple.com" title="Andrew Trick <atrick@apple.com>"> <span class="fn">Andrew Trick</span></a>
</span></b>
<pre>trunk@177986
Fix SCEV forgetMemoizedResults should search and destroy backedge exprs.
Indvars creates a SCEV expression for the loop's back edge taken
count, then determines that the comparison is always true and
removes it.
When loop-unroll asks for the expression, it contains a NULL
SCEVUnknkown (as a CallbackVH).
forgetMemoizedResults should invalidate the loop back edges expression.</pre>
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