Release v0.4.0

[0.4.0] [Minor] - 2021-12-29

Added

• following config macros for internal use:
  • PATOMIC_HAVE_GNU_SYNC
  • PATOMIC_HAVE_GNU_ATOMIC
  • PATOMIC_HAVE_GNU_SYNC_LOCK_FREE_{N} for N in [1, 2, 4, 8, 16]
  • PATOMIC_HAVE_LONG_LONG_EXTN
  • PATOMIC_HAVE_MS_INT128
  • PATOMIC_HAVE_MS_INT128_EXTN
  • PATOMIC_HAVE_IR_SIGN_MAGNITUDE
  • PATOMIC_HAVE_IR_ONES_COMPL
  • PATOMIC_HAVE_INTRIN_EFLAGS_CPUID
  • PATOMIC_HAVE_CPUID_CPUID
• following macros and corresponding config macros for internal use:
  • PATOMIC_LIKELY
  • PATOMIC_UNLIKELY
  • PATOMIC_SIZEOF_{T} for T in [char, short, int, long, long long, __int128]
• alignment helpers in stdalign.h
• typedefs for char, short, int, and long in stdint.h of the form
  patomic_TYPE_(un)signed
• conditionally existing typedefs for long long and __int128 with the same
  naming scheme
• macros PATOMIC_STDINT_HAVE_LLONG/I128 to check if the conditional typedefs
  are available
• gnu implementation can now fall back to __sync if it's available and
  __atomic isn't
• cpuid helpers in cpuid.h

Changed

• removed do_assert, do_assert_aligned, and do_memcpy parameters from
  wrapped macros; now use overrideable default macros from wrapped/do.h
• patomic_(u)intptr_t now checks for 128bit type before checking for
  (unsigned) long long
• std implementation can now use __extension__ (unsigned) long long if it's
  available (by virtue of the fact that it now uses patomic_llong_(un)signed
  from stdint.h rather than (unsigned) long long directly)
• std implementation now properly does 2s complement checks for neg op
• std implementation now does runtime atomic_is_lock_free checks in
  addition to the compile-time macro checks
• renamed PATOMIC_HAVE_TWOS_COMPL to PATOMIC_HAVE_IR_TWOS_COMPL