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P0553R2 is not in the C++2a working draft yet, but is likely to be approved soon. Neither proposal supports std::byte but this adds overloads of each function for std::byte, assuming that will also get added. * include/Makefile.am: Add new header. * include/Makefile.in: Regenerate. * include/precompiled/stdc++.h: Include new header. * include/std/bit: New header. (__rotl, __rotr, __countl_zero, __countl_one, __countr_zero) (__countr_one, __popcount, __ispow2, __ceil2, __floor2, __log2p1): Define for C++14. [!__STRICT_ANSI__] (rotl, rotr, countl_zero, countl_one, countr_zero) (countr_one, popcount): Define for C++2a. Also overload for std::byte. (ispow2, ceil2, floor2, log2p1): Define for C++2a. [!__STRICT_ANSI__] (ispow2, ceil2, floor2, log2p1): Overload for std::byte. * testsuite/26_numerics/bit/bit.pow.two/ceil2.cc: New. * testsuite/26_numerics/bit/bit.pow.two/floor2.cc: New. * testsuite/26_numerics/bit/bit.pow.two/ispow2.cc: New. * testsuite/26_numerics/bit/bit.pow.two/log2p1.cc: New. * testsuite/26_numerics/bit/bitops.rot/rotl.cc: New. * testsuite/26_numerics/bit/bitops.rot/rotr.cc: New. * testsuite/26_numerics/bit/bitops.count/countl_one.cc: New. * testsuite/26_numerics/bit/bitops.count/countl_zero.cc: New. * testsuite/26_numerics/bit/bitops.count/countr_one.cc: New. * testsuite/26_numerics/bit/bitops.count/countr_zero.cc: New. Tested powerpc64le-linux, committed to trunk.
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