Mesa (master): mesa: Add a streaming load memcpy implementation.
Matt Turner
mattst88 at kemper.freedesktop.org
Thu Nov 7 21:18:35 UTC 2013
Module: Mesa
Branch: master
Commit: 6f2e81ce4cc4a03d22e2670191651bfa9bdb0d0c
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=6f2e81ce4cc4a03d22e2670191651bfa9bdb0d0c
Author: Matt Turner <mattst88 at gmail.com>
Date: Mon Nov 4 12:02:24 2013 -0800
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 <chad.versace at linux.intel.com>
---
src/mesa/Makefile.am | 10 ++++-
src/mesa/main/streaming-load-memcpy.c | 85 +++++++++++++++++++++++++++++++++
src/mesa/main/streaming-load-memcpy.h | 33 +++++++++++++
3 files changed, 127 insertions(+), 1 deletions(-)
diff --git a/src/mesa/Makefile.am b/src/mesa/Makefile.am
index 4387415..a60600e 100644
--- a/src/mesa/Makefile.am
+++ b/src/mesa/Makefile.am
@@ -81,7 +81,7 @@ main/get_hash.h: $(GLAPI)/gl_and_es_API.xml main/get_hash_params.py \
-f $< > $@.tmp; \
mv $@.tmp $@;
-noinst_LTLIBRARIES =
+noinst_LTLIBRARIES = $(ARCH_LIBS)
if NEED_LIBMESA
noinst_LTLIBRARIES += libmesa.la
else
@@ -103,6 +103,8 @@ noinst_PROGRAMS = gen_matypes
gen_matypes_SOURCES = x86/gen_matypes.c
BUILT_SOURCES += matypes.h
+ARCH_LIBS = libmesa_sse41.la
+
if HAVE_X86_64_ASM
MESA_ASM_FILES_FOR_ARCH += $(X86_64_FILES)
AM_CPPFLAGS += -I$(builddir)/x86-64 -I$(srcdir)/x86-64
@@ -123,6 +125,7 @@ libmesa_la_SOURCES = \
libmesa_la_LIBADD = \
$(top_builddir)/src/glsl/libglsl.la \
+ $(ARCH_LIBS) \
$()
libmesagallium_la_SOURCES = \
@@ -132,8 +135,13 @@ libmesagallium_la_SOURCES = \
libmesagallium_la_LIBADD = \
$(top_builddir)/src/glsl/libglsl.la \
+ $(ARCH_LIBS) \
$()
+libmesa_sse41_la_SOURCES = \
+ main/streaming-load-memcpy.c
+libmesa_sse41_la_CFLAGS = $(AM_CFLAGS) -msse4.1
+
pkgconfigdir = $(libdir)/pkgconfig
pkgconfig_DATA = gl.pc
diff --git a/src/mesa/main/streaming-load-memcpy.c b/src/mesa/main/streaming-load-memcpy.c
new file mode 100644
index 0000000..d7147af
--- /dev/null
+++ b/src/mesa/main/streaming-load-memcpy.c
@@ -0,0 +1,85 @@
+/*
+ * 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 <eric at anholt.net>
+ * Matt Turner <mattst88 at gmail.com>
+ *
+ */
+
+#include "main/macros.h"
+#include "main/streaming-load-memcpy.h"
+#include <smmintrin.h>
+
+/* 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)
+{
+ char *restrict d = dst;
+ char *restrict s = src;
+
+ /* If dst and src are not co-aligned, fallback to memcpy(). */
+ if (((uintptr_t)d & 15) != ((uintptr_t)s & 15)) {
+ memcpy(d, s, len);
+ return;
+ }
+
+ /* memcpy() the misaligned header. At the end of this if block, <d> and <s>
+ * are aligned to a 16-byte boundary or <len> == 0.
+ */
+ if ((uintptr_t)d & 15) {
+ uintptr_t bytes_before_alignment_boundary = 16 - ((uintptr_t)d & 15);
+ assert(bytes_before_alignment_boundary < 16);
+
+ memcpy(d, s, MIN2(bytes_before_alignment_boundary, len));
+
+ d = (char *)ALIGN((uintptr_t)d, 16);
+ s = (char *)ALIGN((uintptr_t)s, 16);
+ len -= MIN2(bytes_before_alignment_boundary, len);
+ }
+
+ while (len >= 64) {
+ __m128i *dst_cacheline = (__m128i *)d;
+ __m128i *src_cacheline = (__m128i *)s;
+
+ __m128i temp1 = _mm_stream_load_si128(src_cacheline + 0);
+ __m128i temp2 = _mm_stream_load_si128(src_cacheline + 1);
+ __m128i temp3 = _mm_stream_load_si128(src_cacheline + 2);
+ __m128i temp4 = _mm_stream_load_si128(src_cacheline + 3);
+
+ _mm_store_si128(dst_cacheline + 0, temp1);
+ _mm_store_si128(dst_cacheline + 1, temp2);
+ _mm_store_si128(dst_cacheline + 2, temp3);
+ _mm_store_si128(dst_cacheline + 3, temp4);
+
+ d += 64;
+ s += 64;
+ len -= 64;
+ }
+
+ /* memcpy() the tail. */
+ if (len) {
+ memcpy(d, s, len);
+ }
+}
diff --git a/src/mesa/main/streaming-load-memcpy.h b/src/mesa/main/streaming-load-memcpy.h
new file mode 100644
index 0000000..41eeeec
--- /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 <eric at anholt.net>
+ * Matt Turner <mattst88 at gmail.com>
+ *
+ */
+
+/* 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);
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