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X-Received-From: 2a00:1450:4864:20::344 Subject: [Qemu-devel] [PATCH v2] memory: inline and optimize devend_memop X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Tony Nguyen , richard.henderson@linaro.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" devend_memop can rely on the fact that the result is always either 0 or MO_BSWAP, corresponding respectively to host endianness and the opposite. Native (target) endianness in turn can be either the host endianness, in which case MO_BSWAP is only returned for host-opposite endianness, or the opposite, in which case 0 is only returned for host endianness. With this in mind, devend_memop can be compiled as a setcond+shift for every target. Do this and, while at it, move it to include/exec/memory.h since !NEED_CPU_H files do not (and should not) need it. Signed-off-by: Paolo Bonzini --- include/exec/memory.h | 19 ++++++++++++++++++- memory.c | 18 ------------------ 2 files changed, 18 insertions(+), 19 deletions(-) diff --git a/include/exec/memory.h b/include/exec/memory.h index 2dd810259d..2e83c96580 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -2201,8 +2201,25 @@ address_space_write_cached(MemoryRegionCache *cache, hwaddr addr, } } +#ifdef NEED_CPU_H /* enum device_endian to MemOp. */ -MemOp devend_memop(enum device_endian end); +static inline MemOp devend_memop(enum device_endian end) +{ + QEMU_BUILD_BUG_ON(DEVICE_HOST_ENDIAN != DEVICE_LITTLE_ENDIAN && + DEVICE_HOST_ENDIAN != DEVICE_BIG_ENDIAN); + +#ifdef BSWAP_NEEDED + /* Swap if non-host endianness or native (target) endianness */ + return (end == DEVICE_HOST_ENDIAN) ? 0 : MO_BSWAP; +#else + const int non_host_endianness = + DEVICE_LITTLE_ENDIAN ^ DEVICE_BIG_ENDIAN ^ DEVICE_HOST_ENDIAN; + + /* In this case, native (target) endianness needs no swap. */ + return (end == non_host_endianness) ? MO_BSWAP : 0; +#endif +} +#endif #endif diff --git a/memory.c b/memory.c index 61a254c3f9..b9dd6b94ca 100644 --- a/memory.c +++ b/memory.c @@ -3267,21 +3267,3 @@ static void memory_register_types(void) } type_init(memory_register_types) - -MemOp devend_memop(enum device_endian end) -{ - static MemOp conv[] = { - [DEVICE_LITTLE_ENDIAN] = MO_LE, - [DEVICE_BIG_ENDIAN] = MO_BE, - [DEVICE_NATIVE_ENDIAN] = MO_TE, - [DEVICE_HOST_ENDIAN] = 0, - }; - switch (end) { - case DEVICE_LITTLE_ENDIAN: - case DEVICE_BIG_ENDIAN: - case DEVICE_NATIVE_ENDIAN: - return conv[end]; - default: - g_assert_not_reached(); - } -} -- 2.21.0