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tcg: Add atomic128 helpers

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Force the use of cmpxchg16b on x86_64.

Wikipedia suggests that only very old AMD64 (circa 2004) did not have
this instruction.  Further, it's required by Windows 8 so no new cpus
will ever omit it.

If we truely care about these, then we could check this at startup time
and then avoid executing paths that use it.

Reviewed-by: Emilio G. Cota <cota@braap.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2016-06-29 21:10:59 -07:00
parent c482cb117c
commit 7ebee43ee3
6 changed files with 119 additions and 3 deletions
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5
cputlb.c
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@ -690,6 +690,11 @@ static void *atomic_mmu_lookup(CPUArchState *env, target_ulong addr,
#define DATA_SIZE 8
#include "atomic_template.h"
#ifdef CONFIG_ATOMIC128
#define DATA_SIZE 16
#include "atomic_template.h"
#endif
/* Second set of helpers are directly callable from TCG as helpers. */
#undef EXTRA_ARGS