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5 Commits

Author SHA1 Message Date
Craig Topper fd4d584d6b [RISCV] Add DAGCombine to fold (bitreverse (bswap X)) to brev8 with Zbkb. 
If the type is less than XLenVT, type legalization will turn this
into (srl (bitreverse (bswap (srl (bswap X), C))), C). We can't
completely recover from these shifts. They introduce zeros into
the upper bits of the result and we can't easily tell if they are
needed. By doing a DAG combine early, we avoid introducing these
shifts.
 2022-03-12 16:39:39 -08:00
Craig Topper b55a77d222 [RISCV] Add Zbp command lines to bswap-bitreverse.ll. NFC 2022-03-12 16:23:42 -08:00
Craig Topper d8f929a567 [RISCV] Custom legalize BITREVERSE with Zbkb. 
With Zbkb, a bitreverse can be split into a rev8 and a brev8.

Reviewed By: VincentWu

Differential Revision: https://reviews.llvm.org/D118430
 2022-01-28 23:11:12 -08:00
Craig Topper 3e98ce45b6 [RISCV] Add Zbkb RUN lines to bswap-bitreverse.ll. NFC 2022-01-27 21:21:17 -08:00
Craig Topper dcd751b26e [RISCV] Split bswap-bitreverse-ctlz-cttz-ctpop.ll into two files bswap/bitreverse and ctlz/cttz/ctpop. NFC 
Add Zbkb command lines to the bswap/bitreverse test.
 2022-01-27 21:12:03 -08:00