2 Commits

Author	SHA1	Message	Date
Catherine Ho	7400d6938c	tcg: add early clober modifier in atomic16_cmpxchg on aarch64 ... Without this patch, gcc might up the Input/Output registers and cause unpredictable error. Fixes: 1ec182c333 ("target/arm: Convert to HAVE_CMPXCHG128") Signed-off-by: Catherine Ho <catherine.hecx@gmail.com> Message-Id: <1548838794-23757-1-git-send-email-catherine.hecx@gmail.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>	2019-02-06 03:38:39 +00:00
Richard Henderson	e6cd4bb59b	tcg: Split CONFIG_ATOMIC128 ... 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>	2018-10-18 19:46:36 -07:00