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gcc/libstdc++-v3
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Jonathan Wakely 2d6c8eea1d PR libstdc++/70940 optimize pmr::resource_adaptor for allocators using malloc 
pmr::resource_adaptor can avoid allocating an oversized buffer and doing
manual alignment within that buffer when the wrapped allocator is known
to always meet the requested alignment. Specifically, if the allocator
is known to use malloc or new directly, then we can call the allocator
directly for any fundamental alignment.

	PR libstdc++/70940
	* include/experimental/memory_resource
	(__resource_adaptor_common::_AlignMgr::_M_unadjust): Add assertion.
	(__resource_adaptor_common::__guaranteed_alignment): New helper to
	give maximum alignment an allocator guarantees. Specialize for known
	allocators using new and malloc.
	(__resource_adaptor_imp::do_allocate): Use __guaranteed_alignment.
	(__resource_adaptor_imp::do_deallocate): Likewise.
	* testsuite/experimental/memory_resource/new_delete_resource.cc:
	Check that new and delete are called with expected sizes.

From-SVN: r262935
2018-07-23 20:40:28 +01:00
..
config S/390: libstdc++: 64 and 32 bit baseline update 2018-07-16 07:58:01 +00:00
doc PR libstdc++/86450 use -Wabi=2 and simplify -Werror use 2018-07-17 14:18:47 +01:00
include PR libstdc++/70940 optimize pmr::resource_adaptor for allocators using malloc 2018-07-23 20:40:28 +01:00
libsupc++ PR libstdc++/86450 use -Wabi=2 and simplify -Werror use 2018-07-17 14:18:47 +01:00
po PR libstdc++/86450 use -Wabi=2 and simplify -Werror use 2018-07-17 14:18:47 +01:00
python PR libstdc++/86450 use -Wabi=2 and simplify -Werror use 2018-07-17 14:18:47 +01:00
scripts * scripts/create_testsuite_files: Fix typo in comment. 2018-07-16 18:42:20 +01:00
src PR libstdc++/86450 use -Wabi=2 and simplify -Werror use 2018-07-17 14:18:47 +01:00
testsuite PR libstdc++/70940 optimize pmr::resource_adaptor for allocators using malloc 2018-07-23 20:40:28 +01:00
acinclude.m4 PR libstdc++/86450 use -Wabi=2 and simplify -Werror use 2018-07-17 14:18:47 +01:00
aclocal.m4 Build libgo with -Wa,-nH if possible (PR go/78978) [non-libgo parts] 2017-01-06 14:33:47 +00:00
ChangeLog PR libstdc++/70940 optimize pmr::resource_adaptor for allocators using malloc 2018-07-23 20:40:28 +01:00
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ChangeLog-2016 Update copyright years. 2017-01-01 13:07:43 +01:00
ChangeLog-2017 Update copyright years. 2018-01-03 11:03:58 +01:00
config.h.in Fix bootstrap failure for bare metal due to autoconf link tests 2018-06-18 17:01:24 +01:00
configure PR libstdc++/86450 use -Wabi=2 and simplify -Werror use 2018-07-17 14:18:47 +01:00
configure.ac PR libstdc++/86450 use -Wabi=2 and simplify -Werror use 2018-07-17 14:18:47 +01:00
configure.host Separate Solaris/SPARC and x86 baselines 2017-02-02 16:24:03 +00:00
crossconfig.m4 crossconfig.m4: Handle OpenBSD just like NetBSD. 2018-06-18 11:28:53 -06:00
fragment.am PR libstdc++/86450 use -Wabi=2 and simplify -Werror use 2018-07-17 14:18:47 +01:00
linkage.m4
Makefile.am Update copyright years. 2018-01-03 11:03:58 +01:00
Makefile.in PR libstdc++/86450 use -Wabi=2 and simplify -Werror use 2018-07-17 14:18:47 +01:00
README

README 

file: libstdc++-v3/README

New users may wish to point their web browsers to the file
index.html in the 'doc/html' subdirectory.  It contains brief
building instructions and notes on how to configure the library in
interesting ways.