1237dccaea
std::equal operating on non-const __bit_iterators was not working. This fixes it.
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llvm-svn: 161309
2012-08-05 21:43:11 +00:00
aca09de378
Performance tweaking rotate.
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rotate is a critical algorithm because it is often used by other algorithms,
both std and non-std. The main thrust of this optimization is a specialized
algorithm when the 'distance' to be shifted is 1 (either left or right). To my
surprise, this 'optimization' was not effective for types like std::string.
std::string favors rotate algorithms which only use swap. But for types like
scalars, and especially when the sequence is random access, these new
specializations are a big win. If it is a vector<size_t> for example, the
rotate is done via a memmove and can be several times faster than the gcd
algorithm.
I'm using is_trivially_move_assignable to distinguish between types like int and
types like string. This is obviously an ad-hoc approximation, but I haven't
found a case where it doesn't give good results.
I've used a 'static if' (with is_trivially_move_assignable) in three places.
Testing with both -Os and -O3 showed that clang eliminated all code not be
executed by the 'static if' (including the 'static if' itself).
llvm-svn: 161247
2012-08-03 18:01:20 +00:00
d77851e837
Implement [util.smartptr.shared.atomic]. This is the last unimplemented
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section in libc++. This requires a recompiled dylib. Failure to rebuild
the dylib will result in a link-time error if and only if the functions from
[util.smartptr.shared.atomic] are used.
The implementation is not lock free. After considerable thought, I know of no
way to make the implementation lock free. Ideas welcome along that front. But
changing the ABI of shared_ptr is not on the table at this point.
The mutex used to lock these function is encapsulated by std::__sp_mut. The
only thing the client knows about std::__sp_mut is that it has a void* data
member, can't be constructed, and has lock and unlock members. Within the
binary __sp_mut is currently implemented as a pointer to a std::mutex. That can
change in the future without disturbing the ABI (as long as sizeof(__sp_mut)
remains constant.
I specifically did not make __sp_mut a spin lock as I have a pathological
distrust of spin locks. Testing on OS X reveals that the use of std::mutex in
this role is not a large performance penalty as long as the contention for the
mutex is low (more likely to get the lock than to have to wait). In the future
we can still make __sp_mut a spin lock if that is what is desired (without ABI
damage).
The dylib contains 16 __sp_mut's to be chosen based on the hash of the address
of the shared_ptr. The constant 16 is a ball-park reasonable space/time
tradeoff.
std::hash<T*> was changed to call __murmur2_or_cityhash, instead of the identity
function. I had thought we had already done this, but I was mistaken.
All of this is under #if __has_feature(cxx_atomic) even though the
implementation is not lock free, because the signatures require access to
std::memory_order, which is currently available only under
__has_feature(cxx_atomic).
llvm-svn: 160940
2012-07-30 01:40:57 +00:00
c904ad4518
Patch by Andrew C. Morrow: shims to work around macroized getc and putc on linux. On my eglibc 2.13 based Debian system 'getc' is a macro defined in
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/usr/include/stdio.h. This decision to make it a macro doesn't seem to
be guarded by any feature test macro as far as I can see.
llvm-svn: 160799
2012-07-26 20:01:13 +00:00
a1d07d57a7
<algorithm> no longer needs to include <cstdlib>, but can get away with just <cstddef>. This was brought to my attention by Salvatore Benedetto in his port to a bare-metal coretex-m3. This exposed two test bugs where an explicit #include <cstdlib> was needed.
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llvm-svn: 160786
2012-07-26 17:09:09 +00:00
6a03f169db
locale::id really needs to be constructed at compile time.
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llvm-svn: 160785
2012-07-26 16:14:37 +00:00
535a86c3f8
libc++: switch from using _ATTRIBUTE(noreturn) (which conflicts with a
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platform-provided macro on some systems) to _LIBCPP_NORETURN.
llvm-svn: 160773
2012-07-26 02:04:22 +00:00
9d772d17b3
Apple LWG 2067: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3318.html#2067 . This is the only actionable change that has been made to the C++ draft since C++11. In general it has not been decided exactly how libc++ will track changes made to C++11. New features and design changes will probably be #ifdef'd, especially if they are not backwards compatible. Defects and 'dumb mistakes' are more likely to just be put in. Decisions on telling one from the other will be made on a case by case basis.
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llvm-svn: 160608
2012-07-21 19:34:12 +00:00
a4820bc4d5
noexcept applied to <future>.
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llvm-svn: 160607
2012-07-21 17:46:55 +00:00
36101a5b0a
noexcept applied to <thread>.
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llvm-svn: 160606
2012-07-21 16:50:47 +00:00
45c663db4e
noexcept applied to <condition_variable>.
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llvm-svn: 160605
2012-07-21 16:32:53 +00:00
02e610ef34
noexcept and constexpr applied to <mutex>.
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llvm-svn: 160604
2012-07-21 16:13:09 +00:00
42be98ab54
noexcept and constexpr applied to <regex>.
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llvm-svn: 160594
2012-07-21 01:31:58 +00:00
5d926bf1b8
noexcept and constexpr applied to <ios>.
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llvm-svn: 160593
2012-07-21 01:03:40 +00:00
bf882037be
noexcept applied to <valarray>.
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llvm-svn: 160592
2012-07-21 00:51:28 +00:00
f4e11de8e8
constexpr applied to <complex>.
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llvm-svn: 160585
2012-07-20 22:18:27 +00:00
00586de436
noexcept applied to <random>.
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llvm-svn: 160579
2012-07-20 21:44:27 +00:00
8e882dcb2e
noexcept applied to <iterator>.
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llvm-svn: 160565
2012-07-20 19:36:34 +00:00
397717b7c8
constexpr applied to <array>.
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llvm-svn: 160564
2012-07-20 19:20:49 +00:00
931644bfec
constexpr applied to <string>.
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llvm-svn: 160563
2012-07-20 19:09:12 +00:00
14c56f6c4a
Further tweaks on relaxing complete type checking for function.
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llvm-svn: 160562
2012-07-20 18:56:07 +00:00
403845ba75
Relax the complete-type checks that are happening under __invokable<Fp, Args...> to only check Fp, and not Args... . This should be sufficient to give the desired high quality diagnostics under both bind and function. And this allows a test reported by Rich E on cfe-dev to pass. Tracked by <rdar://problem/11880602>.
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llvm-svn: 160285
2012-07-16 16:17:34 +00:00
c033115394
Applied constexpr to <chrono>.
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llvm-svn: 160184
2012-07-13 19:17:27 +00:00
9146984e73
Fixed a bug in wstring_convert concerning zero-length inputs. Thanks to Jonathan Coxhead for reporting this bug.
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llvm-svn: 160136
2012-07-12 18:07:41 +00:00
598f702b04
Change emplace for vector and deque to create the temporary (when necessary) before any changes to the container are made. Nikolay Ivchenkov deserves the credit for pushing this problem and the solution for it.
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llvm-svn: 159918
2012-07-08 23:23:04 +00:00
c0937e8add
Appy constexpr to <memory>. Picked up a few missing noexcepts as well.
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llvm-svn: 159902
2012-07-07 20:56:04 +00:00
bfa7990b5a
Apply constexpr to the mutex constructor. As a conforming extension, apply constexpr to the condition_variable constructor. These are important because it enables the compiler to construct these types at compile time, even though the object will be non-const. Since they are constructed at compile time, there is no chance of a data race before they are constructed.
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llvm-svn: 159901
2012-07-07 20:01:52 +00:00
eeac9fcfb7
Apply constexpr to <bitset>.
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llvm-svn: 159899
2012-07-07 17:04:52 +00:00
8a9ee14803
Apply noexcept to tuple.
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llvm-svn: 159865
2012-07-06 21:53:48 +00:00
a0f4c45c38
As a conforming extension give tuple a noexcept default constructor conditionalized on its held types.
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llvm-svn: 159858
2012-07-06 20:50:27 +00:00
a62ebe043e
Give tuple a constexpr default constructor.
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llvm-svn: 159857
2012-07-06 20:39:45 +00:00
9d6d1c6860
Apply noexcept to those functions implemented in <cstdlib> as a conforming extension.
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llvm-svn: 159850
2012-07-06 19:16:56 +00:00
9c14b75a37
Apply noexcept to those functions implemented in <cmath> as a conforming extension.
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llvm-svn: 159849
2012-07-06 19:13:50 +00:00
4cb38a82a2
This commit establishes a new bucket_count policy in the unordered containers: The policy now allows a power-of-2 number of buckets to be requested (and that request honored) by the client. And if the number of buckets is set to a power of 2, then the constraint of the hash to the number of buckets uses & instead of %. If the client does not specify a number of buckets, then the policy remains unchanged: a prime number of buckets is selected. The growth policy is that the number of buckets is roughly doubled when needed. While growing, either the prime, or the power-of-2 strategy will be preserved. There is a small run time cost for putting in this switch. For very cheap hash functions, e.g. identity for int, the cost can be as high as 18%. However with more typical use cases, e.g. strings, the cost is in the noise level. I've measured cases with very cheap hash functions (int) that using a power-of-2 number of buckets can make look up about twice as fast. However I've also noted that a power-of-2 number of buckets is more susceptible to accidental catastrophic collisions. Though I've also noted that accidental catastrophic collisions are also possible when using a prime number of buckets (but seems far less likely). In short, this patch adds an extra tuning knob for those clients trying to get the last bit of performance squeezed out of their hash containers. Casual users of the hash containers will not notice the introduction of this tuning knob. Those clients who swear by power-of-2 hash containers can now opt-in to that strategy. Clients who prefer a prime number of buckets can continue as they have.
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llvm-svn: 159836
2012-07-06 17:31:14 +00:00
6317bfb26a
mark operator new(std::nothrow) as noalias (aka __attribute__((malloc))
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llvm-svn: 159359
2012-06-28 16:47:34 +00:00
f08ebab2ea
Fixed a bug regarding result_of reported by Sven Behne. The fix is C++11 only mainly because result_of is a variadic beast and working with variadics is just such a problem in C++03 mode. This should bring result_of up to full conformance with the C++11 spec.
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llvm-svn: 159211
2012-06-26 17:37:15 +00:00
c418654096
Revert pair constructors back to using is_convertible instead of is_constructible. This should pull things into alignment with the final draft. Fixes http://llvm.org/bugs/show_bug.cgi?id=13063#add_comment .
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llvm-svn: 158280
2012-06-09 20:01:23 +00:00
4c0de496a0
Fix dangling else clause. Bug found and fixed by Dimitry Andric.
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llvm-svn: 157779
2012-05-31 23:12:03 +00:00
78b4015c1c
Fix the new _ALIGNAS_TYPE per instructions supplied by Eli Friedman.
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llvm-svn: 157765
2012-05-31 20:14:00 +00:00
bf33f5b292
Protect use of alignas against older versions of clang
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llvm-svn: 157764
2012-05-31 19:31:14 +00:00
8b805c915a
The rules for emplace in map, multimap, unordered_map and unordered_multimap changed a while back and I'm just now updating to these new rules. In a nutshell, you've got to know you're emplacing to a pair and use one of pair's constructors. I made one extension: If you want to emplace the key and default construct the mapped_type, you can just emplace(key), as opposed to emplace(piecewise_construct, forward_as_tuple(key), forward_as_tuple()).
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llvm-svn: 157503
2012-05-25 22:04:21 +00:00
a960edd203
Fix memory corruption bug found and fixed by Andrew C. Morrow.
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llvm-svn: 157476
2012-05-25 15:55:46 +00:00
ed81e910bd
Revert fix to http://llvm.org/bugs/show_bug.cgi?id=12867 for the reason now included in the code comment.
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llvm-svn: 157128
2012-05-19 20:20:49 +00:00
a336f5e645
Revert my _LIBCPP_INLINE_VISIBILITY changes, r157097 and r157107
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llvm-svn: 157108
2012-05-19 07:14:17 +00:00
a1b6937dba
valarray resize should not be _LIBCPP_INLINE_VISIBILITY
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llvm-svn: 157107
2012-05-19 07:01:14 +00:00
8f69b1af3d
Move _LIBCPP_VISIBLE_INLINE from the out-of-line definitions of member
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functions to the original declarations, so that Clang will actually
see them. Part of <rdar://problem/11489333>.
llvm-svn: 157097
2012-05-19 04:41:25 +00:00
9042d623bf
Protect __shared_weak_count::__get_deleter declaration with _LIBCPP_NO_RTTI. Fixes http://llvm.org/bugs/show_bug.cgi?id=12867
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llvm-svn: 157049
2012-05-18 13:06:21 +00:00
423a8d7733
Fix several bugs in find/count specialized for bits.
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llvm-svn: 156546
2012-05-10 14:55:00 +00:00
19d9cbfb39
Add friends __count_bool_true and __count_bool_false to __bit_iterator.
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llvm-svn: 156543
2012-05-10 14:01:40 +00:00
0ae9efeb1a
SFINAE __bit_iterator such that it will only get instantiated with a container that has the nested type __storage_type. This prevents accidental instantiation such as in http://llvm.org/bugs/show_bug.cgi?id=12755 . This fixes http://llvm.org/bugs/show_bug.cgi?id=12755 .
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llvm-svn: 156308
2012-05-07 16:50:38 +00:00
Howard Hinnant