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.
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
}
}
+#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);
+
+#if defined(HOST_WORDS_BIGENDIAN) != defined(TARGET_WORDS_BIGENDIAN)
+ /* 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
}
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();
- }
-}