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Patrick Palka d210653f39 libstdc++: Micro-optimize __from_chars_pow2_base 
In the first iteration of __from_chars_pow2_base's main loop, we need
to remember the value of the leading significant digit for sake of the
overflow check at the end (for base > 2).

This patch manually unrolls this first iteration so as to not encumber
the entire loop with logic that only the first iteration needs.  This
seems to significantly improve performance:

Base  Before  After (seconds, lower is better)
   2    9.36   9.37
   8    3.66   2.93
  16    2.93   1.91
  32    2.39   2.24

libstdc++-v3/ChangeLog:

	* include/std/charconv (__from_chars_pow2_base): Manually
	unroll the first iteration of the main loop and simplify
	accordingly.
2022-04-18 17:22:55 -04:00
..
algorithm
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2022-01-03 10:42:10 +01:00
any
libstdc++: Simplify constraints for std::any construction [PR104242]
2022-03-18 15:40:03 +00:00
array
Declare std::array members with attribute const [PR101831].
2022-02-01 17:21:49 -07:00
atomic
libstdc++: Ensure all feature test macros have type long [PR87193]
2022-01-21 16:07:34 +00:00
barrier
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2022-01-03 10:42:10 +01:00
bit
libstdc++: Add more doxygen comments in <bit>
2022-03-25 20:21:48 +00:00
bitset
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2022-01-03 10:42:10 +01:00
charconv
libstdc++: Micro-optimize __from_chars_pow2_base
2022-04-18 17:22:55 -04:00
chrono
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2022-01-03 10:42:10 +01:00
codecvt
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complex
libstdc++: Ensure all feature test macros have type long [PR87193]
2022-01-21 16:07:34 +00:00
concepts
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condition_variable
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coroutine
libstdc++: Install <coroutine> header for freestanding [PR103726]
2022-01-11 13:28:46 +00:00
deque
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execution
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expected
libstdc++: Fix constraints on std::expected<void, E> constructor [PR105153]
2022-04-08 18:30:07 +01:00
filesystem
libstdc++: Ensure all feature test macros have type long [PR87193]
2022-01-21 16:07:34 +00:00
forward_list
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fstream
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functional
libstdc++: Ensure all feature test macros have type long [PR87193]
2022-01-21 16:07:34 +00:00
future
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iomanip
libstdc++: Ensure all feature test macros have type long [PR87193]
2022-01-21 16:07:34 +00:00
ios
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iosfwd
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iostream
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istream
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iterator
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latch
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limits
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list
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locale
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map
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memory
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memory_resource
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mutex
libstdc++: Ensure all feature test macros have type long [PR87193]
2022-01-21 16:07:34 +00:00
numbers
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numeric
libstdc++: Ensure all feature test macros have type long [PR87193]
2022-01-21 16:07:34 +00:00
optional
libstdc++: Fix missing and incorrect feature test macros [PR105269]
2022-04-14 11:02:37 +01:00
ostream
libstdc++: Optimize std::ostream inserters for single characters
2022-01-11 13:28:46 +00:00
queue
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random
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ranges
libstdc++: Implement P2415R2 changes to viewable_range / views::all
2022-02-22 09:37:58 -05:00
ratio
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regex
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scoped_allocator
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semaphore
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set
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shared_mutex
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source_location
libstdc++: Tweak source_location for clang trunk [PR105128]
2022-04-02 12:49:38 +02:00
span
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spanstream
libstdc++: Fix std::spanstream move assignment [PR104032]
2022-01-23 22:48:33 +00:00
sstream
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stack
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stacktrace
libstdc++: shrink-to-fit in std::basic_stacktrace::current(skip, max)
2022-04-12 22:38:31 +01:00
stdexcept
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stop_token
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streambuf
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string
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string_view
libstdc++: Limit new basic_string(nullptr_t) constructor to C++23 [PR104099]
2022-01-18 20:41:46 +00:00
syncstream
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system_error
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thread
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tuple
libstdc++: Ensure all feature test macros have type long [PR87193]
2022-01-21 16:07:34 +00:00
type_traits
libstdc++: Ensure all feature test macros have type long [PR87193]
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typeindex
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unordered_map
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unordered_set
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utility
libstdc++: Implement std::unreachable() for C++23 (P0627R6)
2022-04-01 13:17:18 +01:00
valarray
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variant
libstdc++: Use __cpp_concepts instead of custom macro [PR103891]
2022-02-14 13:03:31 +00:00
vector
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version
libstdc++: Fix missing and incorrect feature test macros [PR105269]
2022-04-14 11:02:37 +01:00