There's no real knowledge of the cacheline size,
just prefetching one loop ahead.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Message-Id: <
1472496380-19706-7-git-send-email-rth@twiddle.net>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
do { \
const VECTYPE *p = buf; \
VECTYPE t; \
+ __builtin_prefetch(buf + SIZE); \
+ barrier(); \
if (SIZE == sizeof(VECTYPE) * 4) { \
t = (p[0] | p[1]) | (p[2] | p[3]); \
} else if (SIZE == sizeof(VECTYPE) * 8) { \
return true;
}
+ /* Fetch the beginning of the buffer while we select the accelerator. */
+ __builtin_prefetch(buf);
+
/* Use an optimized zero check if possible. Note that this also
includes a check for an unrolled loop over 64-bit integers. */
return select_accel_fn(buf, len);