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<div class="moz-cite-prefix">On 01/27/2015 12:28 PM, Ryan Taylor
wrote:<br>
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<div>Thanks for getting back to me.</div>
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<div>So those nodes record if the type has already been expanded
from a narrower type. Can you elaborate how I could use these
to help? Again, I'm pretty unfamiliar with the SDNodes.</div>
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<div>Thanks.</div>
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What is the problem you are trying to solve? These should allow
SimplifyDemandedBits type optimizations understand that your copy
implicitly extended the source<br>
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<div class="gmail_quote">On Tue, Jan 27, 2015 at 3:22 PM, Matt
Arsenault <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:Matthew.Arsenault@amd.com" target="_blank">Matthew.Arsenault@amd.com</a>></span>
wrote:<br>
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<div>On 01/27/2015 12:16 PM, Ryan Taylor wrote:<br>
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<div>I have a CopyToReg that is copying from
different size types, what's the best way to
change that to a zext or sext node based on
signed or unsigned? </div>
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<div>I'm fairly unfamiliar with SelectionDAG
process (outside of the docs on llvm website).</div>
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<div>It seems like I should be able to insert a
custom hook using the register class to identify
the type, potentially in ISelDAGToDag.cpp or is
there a better place for this to be done?</div>
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<div>Thanks.</div>
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It sounds to me like you are looking for the AssertSext /
AssertZext nodes<span class="HOEnZb"><font color="#888888"><br>
<br>
-Matt<br>
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