Craig Topper 67da6fb063 [RISCV] Add TTI support for cpop with Zbb ...

This will tell loop idiom recognize that it can make popcount loops countable
using the ctpop intrinsic. I didn't bother checking for illegal types.
Type legalization knows how to split a ctpop into multiple ctops added together.
Assuming we only receive reasonable integer bit widths, a few cpop instructions
added together is probably better than the loop.

Reviewed By: frasercrmck

Differential Revision: https://reviews.llvm.org/D99203

2021-03-24 10:58:42 -07:00

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lit.local.cfg

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popcnt.ll

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