7393fa8b1d
This patch attempts to implement P1272R4 (except for the std::bit_cast
changes in there which seem quite unrelated to this and will need to be
fixed on the compiler side).
While at least for GCC __builtin_bswap{16,32,64,128} should work fine
in constant expressions, I wonder about other compilers, so I'm using
a fallback implementation for constexpr evaluation always.
If you think that is unnecessary, I can drop the
__cpp_if_consteval >= 202106L &&
if !consteval
{
and
}
and reformat.
The fallback implementation is an attempt to make it work even for integral
types that don't have number of bytes divisible by 2 or when __CHAR_BIT__
is e.g. 16.
2021-11-28 Jakub Jelinek <jakub@redhat.com>
* include/std/bit (__cpp_lib_byteswap, byteswap): Define.
* include/std/version (__cpp_lib_byteswap): Define.
* testsuite/26_numerics/bit/bit.byteswap/byteswap.cc: New test.
* testsuite/26_numerics/bit/bit.byteswap/version.cc: New test.
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| .. | ||
| accumulate | ||
| adjacent_difference | ||
| bit | ||
| complex | ||
| endian | ||
| exclusive_scan | ||
| gcd | ||
| headers | ||
| inclusive_scan | ||
| inner_product | ||
| iota | ||
| lcm | ||
| lerp | ||
| midpoint | ||
| numbers | ||
| partial_sum | ||
| pstl/numeric_ops | ||
| random | ||
| reduce | ||
| slice | ||
| slice_array | ||
| transform_exclusive_scan | ||
| transform_inclusive_scan | ||
| transform_reduce | ||
| valarray | ||