[PATCH v5 10/10] tests/bench: Add bufferiszero-bench

[Richard Henderson <richard.henderson@linaro.org>]

Benchmark each acceleration function vs an aligned buffer of zeros.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 tests/bench/bufferiszero-bench.c | 42 ++++++++++++++++++++++++++++++++
 tests/bench/meson.build          |  4 ++-
 2 files changed, 45 insertions(+), 1 deletion(-)
 create mode 100644 tests/bench/bufferiszero-bench.c

diff --git a/tests/bench/bufferiszero-bench.c b/tests/bench/bufferiszero-bench.c
new file mode 100644
index 0000000000..1fa2eb6973
--- /dev/null
+++ b/tests/bench/bufferiszero-bench.c
@@ -0,0 +1,42 @@
+/*
+ * QEMU buffer_is_zero speed benchmark
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * (at your option) any later version.  See the COPYING file in the
+ * top-level directory.
+ */
+#include "qemu/osdep.h"
+#include "qemu/cutils.h"
+#include "qemu/units.h"
+
+static void test(const void *opaque)
+{
+    size_t len = 64 * KiB;
+    void *buf = g_malloc0(len);
+    int accel_index = 0;
+
+    do {
+        double total = 0.0;
+
+        g_test_timer_start();
+        do {
+            buffer_is_zero_ge256(buf, len);
+            total += len;
+        } while (g_test_timer_elapsed() < 5.0);
+
+        total /= MiB;
+        g_test_message("buffer_is_zero #%d: %.2f MB/sec",
+                       accel_index, total / g_test_timer_last());
+
+        accel_index++;
+    } while (test_buffer_is_zero_next_accel());
+
+    g_free(buf);
+}
+
+int main(int argc, char **argv)
+{
+    g_test_init(&argc, &argv, NULL);
+    g_test_add_data_func("/cutils/bufferiszero/speed", NULL, test);
+    return g_test_run();
+}
diff --git a/tests/bench/meson.build b/tests/bench/meson.build
index 7e76338a52..70d45ff400 100644
--- a/tests/bench/meson.build
+++ b/tests/bench/meson.build
@@ -17,7 +17,9 @@ executable('atomic64-bench',
            dependencies: [qemuutil],
            build_by_default: false)
 
-benchs = {}
+benchs = {
+    'bufferiszero-bench': [],
+}
 
 if have_block
   benchs += {
-- 
2.34.1