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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [NPM] -time-passes does not aggregate time spent per pass"
href="https://bugs.llvm.org/show_bug.cgi?id=47397">47397</a>
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<th>Summary</th>
<td>[NPM] -time-passes does not aggregate time spent per pass
</td>
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<th>Product</th>
<td>new-bugs
</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>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>new bugs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>florian_hahn@apple.com
</td>
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>It looks like `-time-passes` behaves differently under the new & legacy pass
manager.
The legacy pass manager shows a single entry for the time spent in a pass for
all functions, whereas the new pass manager shows separate entries for each
function a pass runs on.
Running `bin/opt -aa-pipeline=basic-aa -passes='dse' foo.ll -time-passes 2>&1
| grep DSEPass` on the IR below will show 2 entries for DSE, one for each
function.
Running `opt -dse foo.ll -time-passes 2>&1 | grep 'Dead Store'` shows a
single entry, containing the run times for DSE on both functions.
Personally I find the behavior of the legacy pass manager more useful, because
on files with many functions the output with the new pass manager becomes
un-manageable.
foo.ll:
define void @test1(i32* %Q, i32* %P) {
ret void
}
define void @test2(i32* %Q, i32* %P) {
ret void
}</pre>
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</p>
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