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accel/tcg: Add aarch64 store_atom_insert_al16

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Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-05-24 22:53:37 +00:00
parent 129fe7cddb
commit dd906a37c7
1 changed files with 47 additions and 0 deletions
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47
host/include/aarch64/host/store-insert-al16.h Normal file
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/*
* SPDX-License-Identifier: GPL-2.0-or-later
* Atomic store insert into 128-bit, AArch64 version.
*
* Copyright (C) 2023 Linaro, Ltd.
*/
#ifndef AARCH64_STORE_INSERT_AL16_H
#define AARCH64_STORE_INSERT_AL16_H
/**
* store_atom_insert_al16:
* @p: host address
* @val: shifted value to store
* @msk: mask for value to store
*
* Atomically store @val to @p masked by @msk.
*/
static inline void ATTRIBUTE_ATOMIC128_OPT
store_atom_insert_al16(Int128 *ps, Int128 val, Int128 msk)
{
/*
* GCC only implements __sync* primitives for int128 on aarch64.
* We can do better without the barriers, and integrating the
* arithmetic into the load-exclusive/store-conditional pair.
*/
uint64_t tl, th, vl, vh, ml, mh;
uint32_t fail;
qemu_build_assert(!HOST_BIG_ENDIAN);
vl = int128_getlo(val);
vh = int128_gethi(val);
ml = int128_getlo(msk);
mh = int128_gethi(msk);
asm("0: ldxp %[l], %[h], %[mem]\n\t"
"bic %[l], %[l], %[ml]\n\t"
"bic %[h], %[h], %[mh]\n\t"
"orr %[l], %[l], %[vl]\n\t"
"orr %[h], %[h], %[vh]\n\t"
"stxp %w[f], %[l], %[h], %[mem]\n\t"
"cbnz %w[f], 0b\n"
: [mem] "+Q"(*ps), [f] "=&r"(fail), [l] "=&r"(tl), [h] "=&r"(th)
: [vl] "r"(vl), [vh] "r"(vh), [ml] "r"(ml), [mh] "r"(mh));
}
#endif /* AARCH64_STORE_INSERT_AL16_H */