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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>
This commit is contained in:
Catherine Ho 2019-01-30 03:59:54 -05:00 committed by Richard Henderson
parent 47994e16b1
commit 7400d6938c
1 changed files with 1 additions and 1 deletions
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2
include/qemu/atomic128.h
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@ -68,7 +68,7 @@ static inline Int128 atomic16_cmpxchg(Int128 *ptr, Int128 cmp, Int128 new)
"cbnz %w[tmp], 0b\n"
"1:"
: [mem] "+m"(*ptr), [tmp] "=&r"(tmp),
[oldl] "=&r"(oldl), [oldh] "=r"(oldh)
[oldl] "=&r"(oldl), [oldh] "=&r"(oldh)
: [cmpl] "r"(cmpl), [cmph] "r"(cmph),
[newl] "r"(newl), [newh] "r"(newh)
: "memory", "cc");