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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Recommend -fprofile-generate instead of -fprofile-instr-generate for PGO in Clang's user manual"
href="https://bugs.llvm.org/show_bug.cgi?id=46323">46323</a>
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<th>Summary</th>
<td>Recommend -fprofile-generate instead of -fprofile-instr-generate for PGO in Clang's user manual
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<th>Product</th>
<td>Documentation
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<th>Version</th>
<td>trunk
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>General docs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>hans@chromium.org
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<th>CC</th>
<td>george.burgess.iv@gmail.com, llvm-bugs@lists.llvm.org, xur@google.com
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<pre>Clang's user manual currently recommends -fprofile-instr-generate for
instrumentation based profile-guided optimization
(<a href="https://clang.llvm.org/docs/UsersManual.html#profiling-with-instrumentation">https://clang.llvm.org/docs/UsersManual.html#profiling-with-instrumentation</a>)
Towards the end of that section, there is a part about -fprofile-generate
saying it's an alternative instrumentation method.
However, my understanding is that -fprofile-generate is really better for PGO
(it supports value profiling for example), and -fprofile-instr-generate is best
left for code coverage analysis.
If my understand is correct, can we update the docs to reflect this?</pre>
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