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Bitreverse rtl code was added with r14-1586-g6160572f8d243c. So let's use it instead of an unspec. This is just a small cleanup but it does have one small fix with respect to rtx costs which didn't handle vector modes correctly for the UNSPEC and now it does. This is part of the first step in adding __builtin_bitreverse's builtins but it is independent of it though. Bootstrapped and tested on aarch64-linux-gnu with no regressions. gcc/ChangeLog: PR target/115176 * config/aarch64/aarch64-simd.md (aarch64_rbit<mode><vczle><vczbe>): Use bitreverse instead of unspec. * config/aarch64/aarch64-sve-builtins-base.cc (svrbit): Convert over to using rtx_code_function instead of unspec_based_function. * config/aarch64/aarch64-sve.md: Update comment where RBIT is included. * config/aarch64/aarch64.cc (aarch64_rtx_costs): Handle BITREVERSE like BSWAP. Remove UNSPEC_RBIT support. * config/aarch64/aarch64.md (unspec): Remove UNSPEC_RBIT. (aarch64_rbit<mode>): Use bitreverse instead of unspec. * config/aarch64/iterators.md (SVE_INT_UNARY): Add bitreverse. (optab): Likewise. (sve_int_op): Likewise. (SVE_INT_UNARY): Remove UNSPEC_RBIT. (optab): Likewise. (sve_int_op): Likewise. (min_elem_bits): Likewise. Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>
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