Eli Friedman b219a9c0a2 [CostModel][AArch64] Fix ctpop intrinsic cost when NEON is disabled. ...

If we don't have NEON, we use the generic fallback, which takes 12
instructions. Make sure the costs reflect that.

(On a related note, we could optimize the generic fallback a bit. It
currently uses sequences like lsr+and+add; if we use and+lsr+add
instead, we can fold the lsr into the add.)

Differential Revision: https://reviews.llvm.org/D133154

2022-09-02 15:17:55 -07:00

122 KiB

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