[Mesa-dev] [PATCH V3] mesa: add SSE optimisation for glDrawElements

Timothy Arceri t_arceri at yahoo.com.au
Sat Oct 25 16:47:00 PDT 2014


Makes use of SSE to speed up compute of min and max elements

Callgrind cpu usage results from pts benchmarks:

Openarena 0.8.8: 3.67% -> 1.03%
UrbanTerror: 2.36% -> 0.81%

Signed-off-by: Timothy Arceri <t_arceri at yahoo.com.au>
---
 src/mesa/Android.libmesa_dricore.mk |  3 +-
 src/mesa/Makefile.am                |  3 +-
 src/mesa/main/sse_minmax.c          | 92 +++++++++++++++++++++++++++++++++++++
 src/mesa/main/sse_minmax.h          | 30 ++++++++++++
 src/mesa/vbo/vbo_exec_array.c       | 14 ++++--
 5 files changed, 137 insertions(+), 5 deletions(-)
 create mode 100644 src/mesa/main/sse_minmax.c
 create mode 100644 src/mesa/main/sse_minmax.h

Thanks again to everyone for the feedback.

V3:

- Removed sse_minmax.c from Makefile.sources
- handle the first few values without SSE until the pointer is aligned
 and use _mm_load_si128 rather than _mm_loadu_si128
- guard the call to the SSE code better at build time

diff --git a/src/mesa/Android.libmesa_dricore.mk b/src/mesa/Android.libmesa_dricore.mk
index 1e6d948..52d626f 100644
--- a/src/mesa/Android.libmesa_dricore.mk
+++ b/src/mesa/Android.libmesa_dricore.mk
@@ -51,7 +51,8 @@ endif # MESA_ENABLE_ASM
 
 ifeq ($(ARCH_X86_HAVE_SSE4_1),true)
 LOCAL_SRC_FILES += \
-	$(SRCDIR)main/streaming-load-memcpy.c
+	$(SRCDIR)main/streaming-load-memcpy.c \
+	$(SRCDIR)main/sse_minmax.c
 LOCAL_CFLAGS := -msse4.1
 endif
 
diff --git a/src/mesa/Makefile.am b/src/mesa/Makefile.am
index e71bccb..932db4f 100644
--- a/src/mesa/Makefile.am
+++ b/src/mesa/Makefile.am
@@ -151,7 +151,8 @@ libmesagallium_la_LIBADD = \
 	$(ARCH_LIBS)
 
 libmesa_sse41_la_SOURCES = \
-	main/streaming-load-memcpy.c
+	main/streaming-load-memcpy.c \
+	main/sse_minmax.c
 libmesa_sse41_la_CFLAGS = $(AM_CFLAGS) -msse4.1
 
 pkgconfigdir = $(libdir)/pkgconfig
diff --git a/src/mesa/main/sse_minmax.c b/src/mesa/main/sse_minmax.c
new file mode 100644
index 0000000..8f05982
--- /dev/null
+++ b/src/mesa/main/sse_minmax.c
@@ -0,0 +1,92 @@
+/*
+ * Copyright © 2014 Timothy Arceri
+ *
+ * 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.
+ *
+ * Author:
+ *    Timothy Arceri <t_arceri at yahoo.com.au>
+ *
+ */
+
+#ifdef __SSE4_1__
+#include "main/sse_minmax.h"
+#include <smmintrin.h>
+#include <stdint.h>
+
+void
+_mesa_uint_array_min_max(const unsigned *ui_indices, unsigned *min_index,
+                         unsigned *max_index, const unsigned count)
+{
+   unsigned max_ui = 0;
+   unsigned min_ui = ~0U;
+   unsigned i = 0;
+
+   /* handle the first few values without SSE until the pointer is aligned */
+   while (((uintptr_t)ui_indices & 15) && (i < count)) {
+      if (ui_indices[i] > max_ui)
+         max_ui = ui_indices[i];
+      if (ui_indices[i] < min_ui)
+         min_ui = ui_indices[i];
+
+      i++;
+      ui_indices++;
+   }
+
+   if ((count - i) >= 4) {
+      unsigned max_arr[4] __attribute__ ((aligned (16)));
+      unsigned min_arr[4] __attribute__ ((aligned (16)));
+      unsigned vec_count;
+      __m128i max_ui4 = _mm_setzero_si128();
+      __m128i min_ui4 = _mm_set1_epi32(~0U);
+      __m128i ui_indices4;
+      __m128i *ui_indices_ptr;
+
+      vec_count = count & ~0x3;
+      ui_indices_ptr = (__m128i*)ui_indices;
+      for (i = 0; i < vec_count / 4; i++) {
+         ui_indices4 = _mm_load_si128(&ui_indices_ptr[i]);
+         max_ui4 = _mm_max_epu32(ui_indices4, max_ui4);
+         min_ui4 = _mm_min_epu32(ui_indices4, min_ui4);
+      }
+
+      _mm_store_si128((__m128i*)max_arr, max_ui4);
+      _mm_store_si128((__m128i*)min_arr, min_ui4);
+
+      for (i = 0; i < 4; i++) {
+         if (max_arr[i] > max_ui)
+            max_ui = max_arr[i];
+         if (min_arr[i] < min_ui)
+            min_ui = min_arr[i];
+      }
+      i = vec_count;
+   }
+
+   for (; i < count; i++) {
+      if (ui_indices[i] > max_ui)
+         max_ui = ui_indices[i];
+      if (ui_indices[i] < min_ui)
+         min_ui = ui_indices[i];
+   }
+
+   *min_index = min_ui;
+   *max_index = max_ui;
+}
+
+#endif
diff --git a/src/mesa/main/sse_minmax.h b/src/mesa/main/sse_minmax.h
new file mode 100644
index 0000000..953c4e9
--- /dev/null
+++ b/src/mesa/main/sse_minmax.h
@@ -0,0 +1,30 @@
+/*
+ * Copyright © 2014 Timothy Arceri
+ *
+ * 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.
+ *
+ * Author:
+ *    Timothy Arceri <t_arceri at yahoo.com.au>
+ *
+ */
+
+void
+_mesa_uint_array_min_max(const unsigned *ui_indices, unsigned *min_index,
+                         unsigned *max_index, const unsigned count);
diff --git a/src/mesa/vbo/vbo_exec_array.c b/src/mesa/vbo/vbo_exec_array.c
index 045dbb5..e623b36 100644
--- a/src/mesa/vbo/vbo_exec_array.c
+++ b/src/mesa/vbo/vbo_exec_array.c
@@ -36,6 +36,8 @@
 #include "main/enums.h"
 #include "main/macros.h"
 #include "main/transformfeedback.h"
+#include "main/sse_minmax.h"
+#include "x86/common_x86_asm.h"
 
 #include "vbo_context.h"
 
@@ -119,10 +121,16 @@ vbo_get_minmax_index(struct gl_context *ctx,
          }
       }
       else {
-         for (i = 0; i < count; i++) {
-            if (ui_indices[i] > max_ui) max_ui = ui_indices[i];
-            if (ui_indices[i] < min_ui) min_ui = ui_indices[i];
+#if defined(USE_SSE41)
+         if (cpu_has_sse4_1) {
+            _mesa_uint_array_min_max(ui_indices, &min_ui, &max_ui, count);
          }
+         else
+#endif
+            for (i = 0; i < count; i++) {
+               if (ui_indices[i] > max_ui) max_ui = ui_indices[i];
+               if (ui_indices[i] < min_ui) min_ui = ui_indices[i];
+            }
       }
       *min_index = min_ui;
       *max_index = max_ui;
-- 
1.9.3



More information about the mesa-dev mailing list