mesa: Add a streaming load memcpy implementation.

Uses SSE 4.1's MOVNTDQA instruction (streaming load) to read from
uncached memory without polluting the cache.

Reviewed-by: Chad Versace <[email protected]>

1 files changed, 33 insertions, 0 deletions

diff --git a/src/mesa/main/streaming-load-memcpy.h b/src/mesa/main/streaming-load-memcpy.h
new file mode 100644
index 00000000000..41eeeeca0f1
--- /dev/null
+++ b/src/mesa/main/streaming-load-memcpy.h
@@ -0,0 +1,33 @@
+/*
+ * Copyright © 2013 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Eric Anholt <[email protected]>
+ *    Matt Turner <[email protected]>
+ *
+ */
+
+/* Copies memory from src to dst, using SSE 4.1's MOVNTDQA to get streaming
+ * read performance from uncached memory.
+ */
+void
+_mesa_streaming_load_memcpy(void *restrict dst, void *restrict src, size_t len);