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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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24
tcg/tcg.h
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@ -1229,7 +1229,29 @@ GEN_ATOMIC_HELPER_ALL(xchg)
#undef GEN_ATOMIC_HELPER_ALL
#undef GEN_ATOMIC_HELPER
#endif /* CONFIG_SOFTMMU */
#ifdef CONFIG_ATOMIC128
#include "qemu/int128.h"
/* These aren't really a "proper" helpers because TCG cannot manage Int128.
However, use the same format as the others, for use by the backends. */
Int128 helper_atomic_cmpxchgo_le_mmu(CPUArchState *env, target_ulong addr,
Int128 cmpv, Int128 newv,
TCGMemOpIdx oi, uintptr_t retaddr);
Int128 helper_atomic_cmpxchgo_be_mmu(CPUArchState *env, target_ulong addr,
Int128 cmpv, Int128 newv,
TCGMemOpIdx oi, uintptr_t retaddr);
Int128 helper_atomic_ldo_le_mmu(CPUArchState *env, target_ulong addr,
TCGMemOpIdx oi, uintptr_t retaddr);
Int128 helper_atomic_ldo_be_mmu(CPUArchState *env, target_ulong addr,
TCGMemOpIdx oi, uintptr_t retaddr);
void helper_atomic_sto_le_mmu(CPUArchState *env, target_ulong addr, Int128 val,
TCGMemOpIdx oi, uintptr_t retaddr);
void helper_atomic_sto_be_mmu(CPUArchState *env, target_ulong addr, Int128 val,
TCGMemOpIdx oi, uintptr_t retaddr);
#endif /* CONFIG_ATOMIC128 */
#endif /* TCG_H */