GCC modified for the FreeChainXenon project
822c1d21a3
This extends the fast path to also work when the URBG's range of possible values is not the entire range of its result_type. Previously, the slow path would be used for engines with a uint_fast32_t result type if that type is actually a typedef for uint64_t rather than uint32_t. After this change, the generator's result_type is not important, only the range of possible value that generator can produce. If the generator's range is exactly UINT64_MAX then the calculation will be done using 128-bit and 64-bit integers, and if the range is UINT32_MAX it will be done using 64-bit and 32-bit integers. In practice, this benefits most of the engines and engine adaptors defined in [rand.predef] on x86_64-linux and other 64-bit targets. This is because std::minstd_rand0 and std::mt19937 and others use uint_fast32_t, which is a typedef for uint64_t. The code now makes use of the recently-clarified requirement that the generator's min() and max() functions are usable in constant expressions (see LWG 2154). libstdc++-v3/ChangeLog: * include/bits/uniform_int_dist.h (_Power_of_two): Add constexpr. (uniform_int_distribution::_S_nd): Add static_assert to ensure the wider type is twice as wide as the result type. (uniform_int_distribution::__generate_impl): Add static_assert and declare variables as constexpr where appropriate. (uniform_int_distribution:operator()): Likewise. Only consider the uniform random bit generator's range of possible results when deciding whether _S_nd can be used, not the __uctype type. |
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| config | ||
| contrib | ||
| fixincludes | ||
| gcc | ||
| gnattools | ||
| gotools | ||
| include | ||
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| libada | ||
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| libgfortran | ||
| libgo | ||
| libgomp | ||
| libhsail-rt | ||
| libiberty | ||
| libitm | ||
| libobjc | ||
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| zlib | ||
| .dir-locals.el | ||
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| depcomp | ||
| install-sh | ||
| libtool-ldflags | ||
| libtool.m4 | ||
| ltgcc.m4 | ||
| ltmain.sh | ||
| ltoptions.m4 | ||
| ltsugar.m4 | ||
| ltversion.m4 | ||
| lt~obsolete.m4 | ||
| MAINTAINERS | ||
| Makefile.def | ||
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| missing | ||
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