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<div class="moz-cite-prefix">On 2/26/16 1:47 AM, Balasaheb Dabhade
via llvm-dev wrote:<br>
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cite="mid:CAEG6jukVmzgf+st+e2NqRGp-Cs5UNHF6Fg7XmLSaZaGJwBRU9g@mail.gmail.com"
type="cite">
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<div dir="ltr">Hi All,
<div><br>
</div>
<div>I wanted to collect the register usage stats for the
program assigned by compiler(in other words "how many time
each register will be accessed by the program when it will
execute"). How to write LLVM pass which will analyse the code
after LLVM global register allocation pass and output the
stats. <br>
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</blockquote>
<br>
Are you counting the number of static uses of a register in each
function, or are you instrumenting the program to count the number
of times a register is used during execution?<br>
<br>
Regardless of which you are doing, you will need to write a
MachineFunctionPass that performs the analysis and/or
instrumentation. You can read about the MachineFunctionPass in the
"How to Write an LLVM Pass" document. This document
(<a class="moz-txt-link-freetext" href="http://llvm.org/docs/CodeGenerator.html">http://llvm.org/docs/CodeGenerator.html</a>) will also be useful.<br>
<br>
Regards,<br>
<br>
John Criswell<br>
<br>
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cite="mid:CAEG6jukVmzgf+st+e2NqRGp-Cs5UNHF6Fg7XmLSaZaGJwBRU9g@mail.gmail.com"
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<div><br>
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<div>Regards,<br>
</div>
<div>-Bala</div>
<div><br>
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<div> </div>
</div>
<div dir="ltr">-- <br>
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<div dir="ltr">
<div>Thanks,</div>
Bala
<div>IIITA Allahabad</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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