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tcg: Split CONFIG_ATOMIC128

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GCC7+ will no longer advertise support for 16-byte __atomic operations
if only cmpxchg is supported, as for x86_64.  Fortunately, x86_64 still
has support for __sync_compare_and_swap_16 and we can make use of that.
AArch64 does not have, nor ever has had such support, so open-code it.

Reviewed-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2018-08-15 16:31:47 -07:00
parent 383beda9cf
commit e6cd4bb59b
7 changed files with 213 additions and 14 deletions
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11
include/qemu/compiler.h
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@ -146,6 +146,17 @@
# define QEMU_FLATTEN
#endif
/*
* If __attribute__((error)) is present, use it to produce an error at
* compile time. Otherwise, one must wait for the linker to diagnose
* the missing symbol.
*/
#if __has_attribute(error)
# define QEMU_ERROR(X) __attribute__((error(X)))
#else
# define QEMU_ERROR(X)
#endif
/* Implement C11 _Generic via GCC builtins. Example:
*
* QEMU_GENERIC(x, (float, sinf), (long double, sinl), sin) (x)