Displaying 1 result from an estimated 1 matches for "d4e46bc5".
2017 May 07
2
How does one match undef in tablegen?
I would like to specialise build_vector for the case when one of the
operands is undefined. How do I describe this?
This is looking for an analog of specialisations like:
def : Pat <v2i32 (build_vector i32:$x, (i32 0)),...>;
but for an undefined, rather than zero, value.
I can work around my ignorance in performDAGCombine but would prefer to add
to the existing pattern matching.
Thanks,