Philip Reames d288574363 [TTI][RISCV] Model cost of loading constants arms of selects and compares (#109824) ...

This follows in the spirit of 7d82c99403,
and extends the costing API for compares and selects to provide
information about the operands passed in an analogous manner. This
allows us to model the cost of materializing the vector constant, as
some select-of-constants are significantly more expensive than others
when you account for the cost of materializing the constants involved.

This is a stepping stone towards fixing
https://github.com/llvm/llvm-project/issues/109466. A separate SLP patch
will be required to utilize the new API.

2024-09-25 07:25:57 -07:00

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