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2017 Jun 06
2
Putting "tied-to" constraints on virtual registers in SelectionDAGISel's Select() method
...finition or
no definition" later, after instruction selection.
Therefore, I try to use 2 virtual registers for the same physical register. I know in
TablGen instruction specs we can give "tied-to" constraints on virtual registers of the form:
string Constraints = "$regInput = $regOutput";
Can we put such "tied-to" constraints programatically also at instruction selection,
in the Select() method of the SelectionDAGISel class?
Thank you,
Alex