mirror of git://sourceware.org/git/glibc.git
8a9a593115
GCC 4.9.0 added the alloc_align attribute to say that a function argument specifies the alignment of the returned pointer. Clang supports the attribute too. Using the attribute can allow a compiler to generate better code if it knows the returned pointer has a minimum alignment. See https://gcc.gnu.org/PR60092 for more details. GCC implicitly knows the semantics of aligned_alloc and posix_memalign, but not the obsolete memalign. As a result, GCC generates worse code when memalign is used, compared to aligned_alloc. Clang knows about aligned_alloc and memalign, but not posix_memalign. This change adds a new __attribute_alloc_align__ macro to <sys/cdefs.h> and then uses it on memalign (where it helps GCC) and aligned_alloc (where GCC and Clang already know the semantics, but it doesn't hurt) and xposix_memalign. It can't be used on posix_memalign because that doesn't return a pointer (the allocated pointer is returned via a void** parameter instead). Unlike the alloc_size attribute, alloc_align only allows a single argument. That means the new __attribute_alloc_align__ macro doesn't really need to be used with double parentheses to protect a comma between its arguments. For consistency with __attribute_alloc_size__ this patch defines it the same way, so that double parentheses are required. Signed-off-by: Jonathan Wakely <jwakely@redhat.com> Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@redhat.com> |
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| .. | ||
| bits | ||
| sys | ||
| Depend | ||
| Makefile | ||
| Versions | ||
| a64l.c | ||
| abort.c | ||
| abs.c | ||
| add_n.c | ||
| addmul_1.c | ||
| alloca.h | ||
| at_quick_exit.c | ||
| atexit.c | ||
| atof.c | ||
| atoi.c | ||
| atol.c | ||
| atoll.c | ||
| bsearch.c | ||
| bug-fmtmsg1.c | ||
| bug-getcontext.c | ||
| bug-strtod.c | ||
| bug-strtod2.c | ||
| canonicalize.c | ||
| cmp.c | ||
| cxa_at_quick_exit.c | ||
| cxa_atexit.c | ||
| cxa_finalize.c | ||
| cxa_thread_atexit_impl.c | ||
| dbl2mpn.c | ||
| div.c | ||
| divmod_1.c | ||
| divrem.c | ||
| drand48-iter.c | ||
| drand48.c | ||
| drand48_r.c | ||
| erand48.c | ||
| erand48_r.c | ||
| errno.h | ||
| exit.c | ||
| exit.h | ||
| fmtmsg.c | ||
| fmtmsg.h | ||
| fpioconst.c | ||
| fpioconst.h | ||
| gen-fpioconst.c | ||
| gen-tst-strtod-round.c | ||
| getcontext.c | ||
| getentropy.c | ||
| getenv.c | ||
| getrandom.c | ||
| getsubopt.c | ||
| gmp-impl.h | ||
| gmp.h | ||
| grouping.c | ||
| grouping.h | ||
| groupingwc.c | ||
| inlines.c | ||
| inttypes.h | ||
| isomac.c | ||
| jrand48.c | ||
| jrand48_r.c | ||
| l64a.c | ||
| labs.c | ||
| lcong48.c | ||
| lcong48_r.c | ||
| ldbl2mpn.c | ||
| ldiv.c | ||
| llabs.c | ||
| lldiv.c | ||
| longlong.h | ||
| lrand48.c | ||
| lrand48_r.c | ||
| lshift.c | ||
| makecontext.c | ||
| mblen.c | ||
| mbstowcs.c | ||
| mbtowc.c | ||
| mod_1.c | ||
| monetary.h | ||
| mp_clz_tab.c | ||
| mpn2dbl.c | ||
| mpn2flt.c | ||
| mpn2ldbl.c | ||
| mrand48.c | ||
| mrand48_r.c | ||
| msort.c | ||
| mul.c | ||
| mul_1.c | ||
| mul_n.c | ||
| nrand48.c | ||
| nrand48_r.c | ||
| old_atexit.c | ||
| on_exit.c | ||
| putenv.c | ||
| qsort.c | ||
| quick_exit.c | ||
| rand.c | ||
| rand_r.c | ||
| random.c | ||
| random_r.c | ||
| rpmatch.c | ||
| rshift.c | ||
| secure-getenv.c | ||
| seed48.c | ||
| seed48_r.c | ||
| setcontext.c | ||
| setenv.c | ||
| srand48.c | ||
| srand48_r.c | ||
| stdint.h | ||
| stdlib.h | ||
| strfmon.c | ||
| strfmon_l.c | ||
| strfrom-skeleton.c | ||
| strfromd.c | ||
| strfromf.c | ||
| strfroml.c | ||
| strtod.c | ||
| strtod_l.c | ||
| strtod_nan.c | ||
| strtod_nan_main.c | ||
| strtod_nan_narrow.h | ||
| strtod_nan_wide.h | ||
| strtof.c | ||
| strtof_l.c | ||
| strtof_nan.c | ||
| strtol.c | ||
| strtol_l.c | ||
| strtold.c | ||
| strtold_l.c | ||
| strtold_nan.c | ||
| strtoll.c | ||
| strtoll_l.c | ||
| strtoul.c | ||
| strtoul_l.c | ||
| strtoull.c | ||
| strtoull_l.c | ||
| sub_n.c | ||
| submul_1.c | ||
| swapcontext.c | ||
| system.c | ||
| tens_in_limb.c | ||
| test-a64l.c | ||
| test-at_quick_exit-race.c | ||
| test-atexit-race-common.c | ||
| test-atexit-race.c | ||
| test-bz22786.c | ||
| test-canon.c | ||
| test-canon2.c | ||
| test-cxa_atexit-race.c | ||
| test-cxa_atexit-race2.c | ||
| test-dlclose-exit-race-helper.c | ||
| test-dlclose-exit-race.c | ||
| test-on_exit-race.c | ||
| testdiv.c | ||
| testdiv.input | ||
| testmb.c | ||
| testmb2.c | ||
| testrand.c | ||
| testsort.c | ||
| tst-at_quick_exit.c | ||
| tst-atexit-common.c | ||
| tst-atexit.c | ||
| tst-atof1.c | ||
| tst-atof2.c | ||
| tst-bsearch.c | ||
| tst-bz20544.c | ||
| tst-canon-bz26341.c | ||
| tst-cxa_atexit.c | ||
| tst-empty-env.c | ||
| tst-environ.c | ||
| tst-fmtmsg.c | ||
| tst-fmtmsg.sh | ||
| tst-getrandom.c | ||
| tst-limits.c | ||
| tst-makecontext-align.c | ||
| tst-makecontext.c | ||
| tst-makecontext2.c | ||
| tst-makecontext3.c | ||
| tst-on_exit.c | ||
| tst-putenv.c | ||
| tst-putenvmod.c | ||
| tst-qsort.c | ||
| tst-qsort2.c | ||
| tst-quick_exit.cc | ||
| tst-rand48-2.c | ||
| tst-rand48.c | ||
| tst-random.c | ||
| tst-random2.c | ||
| tst-realpath.c | ||
| tst-secure-getenv.c | ||
| tst-setcontext.c | ||
| tst-setcontext2.c | ||
| tst-setcontext3.c | ||
| tst-setcontext3.sh | ||
| tst-setcontext4.c | ||
| tst-setcontext5.c | ||
| tst-setcontext6.c | ||
| tst-setcontext7.c | ||
| tst-setcontext8.c | ||
| tst-setcontext9.c | ||
| tst-strfmon_l.c | ||
| tst-strfrom-locale.c | ||
| tst-strfrom.c | ||
| tst-strfrom.h | ||
| tst-strtod-nan-locale-main.c | ||
| tst-strtod-nan-locale.c | ||
| tst-strtod-nan-sign-main.c | ||
| tst-strtod-nan-sign.c | ||
| tst-strtod-overflow.c | ||
| tst-strtod-round-data | ||
| tst-strtod-round-data.h | ||
| tst-strtod-round-skeleton.c | ||
| tst-strtod-round.c | ||
| tst-strtod-underflow.c | ||
| tst-strtod.c | ||
| tst-strtod.h | ||
| tst-strtod1i.c | ||
| tst-strtod2.c | ||
| tst-strtod3.c | ||
| tst-strtod4.c | ||
| tst-strtod5.c | ||
| tst-strtod5i.c | ||
| tst-strtod6.c | ||
| tst-strtol-locale-main.c | ||
| tst-strtol-locale.c | ||
| tst-strtol.c | ||
| tst-strtoll.c | ||
| tst-swapcontext1.c | ||
| tst-system.c | ||
| tst-thread-quick_exit.cc | ||
| tst-tininess.c | ||
| tst-tls-atexit-lib.c | ||
| tst-tls-atexit-nodelete.c | ||
| tst-tls-atexit.c | ||
| tst-unsetenv1.c | ||
| tst-width-stdint.c | ||
| tst-width.c | ||
| tst-xpg-basename.c | ||
| ucontext.h | ||
| udiv_qrnnd.c | ||
| wcstombs.c | ||
| wctomb.c | ||
| xpg_basename.c | ||