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<div class="moz-cite-prefix">On 12/1/14, 11:15 PM, Rahman Lavaee
wrote:<br>
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<div>I am trying to use CloneFunction to clone every IR
function in a program, give the cloned versions a prefix and
call the clones from the original functions (redirect the
calls).<br>
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Surprisingly, I see that after the LTO optimizations, the
number of machine basic blocks in the two functions differ in
some cases. <br>
<br>
Is this reasonable at all, given that the two functions must
be exactly the same in the IR level.<br>
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Or it might happen because of the interprocedural optimizations?
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Have you verified that the old and new functions are identical at
the LLVM IR level right before code generation in libLTO (you can
easily modify libLTO to dump out the LLVM IR right before code
generation). It might happen because of inter-procedural
optimizations. If the old functions are no longer called, then
inter-procedural constant propagation and other inter-procedural
optimizations may change the new functions but not the old
functions.<br>
<br>
I don't know if the code generators do any inter-procedural
analysis; my impression was that they did not. However, someone
else needs to answer that question.<br>
<br>
Regards,<br>
<br>
John Criswell<br>
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<div>-- <br>
<div class="gmail_signature"><font face="tahoma,
sans-serif">Rahman</font></div>
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<pre class="moz-signature" cols="72">--
John Criswell
Assistant Professor
Department of Computer Science, University of Rochester
<a class="moz-txt-link-freetext" href="http://www.cs.rochester.edu/u/criswell">http://www.cs.rochester.edu/u/criswell</a></pre>
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