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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - SROA::performScalarRepl comment claims to work on all alloca's in function, but it only add ones in the entry block"
href="http://llvm.org/bugs/show_bug.cgi?id=15777">15777</a>
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<th>Summary</th>
<td>SROA::performScalarRepl comment claims to work on all alloca's in function, but it only add ones in the entry block
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Scalar Optimizations
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>sschiffli@gmail.com
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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</tr></table>
<p>
<div>
<pre>Here is the code snippet that I am confused about:
...
// performScalarRepl - This algorithm is a simple worklist driven algorithm,
// which runs on all of the alloca instructions in the function, removing them
// if they are only used by getelementptr instructions.
//
bool SROA::performScalarRepl(Function &F) {
std::vector<AllocaInst*> WorkList;
// Scan the entry basic block, adding allocas to the worklist.
BasicBlock &BB = F.getEntryBlock();
for (BasicBlock::iterator I = BB.begin(), E = BB.end(); I != E; ++I)
if (AllocaInst *A = dyn_cast<AllocaInst>(I))
WorkList.push_back(A);
...
Is it a code bug in that we are supposed to add all alloca's in the function to
the worklist? Or is this a comment bug, or something else that I am missing.
Would there be any reason to only allow alloca's in the entry block to be
optimized? I played around with adding all, and it fixed the optimization bug
I was seeing.</pre>
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