[Qemu-devel] [PATCH 4/7] cutils: Add generic prefetch

[Richard Henderson <rth@twiddle.net>]

There's no real knowledge of the cacheline size,
just prefetching one loop ahead.

Signed-off-by: Richard Henderson <rth@twiddle.net>
---
 util/cutils.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/util/cutils.c b/util/cutils.c
index 4d2edd6..0f1ce1d 100644
--- a/util/cutils.c
+++ b/util/cutils.c
@@ -173,6 +173,8 @@ NAME(const void *buf, size_t len)                               \
     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) {               \
@@ -376,6 +378,9 @@ bool buffer_is_zero(const void *buf, size_t len)
         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 longs, as well as
        the unsized, unaligned fallback to buffer_zero_base.  */
-- 
2.7.4