From: Dave Airlie <airlied@redhat.com>
Date: Tue, 31 Mar 2020 22:44:08 +0000 (+1000)
Subject: gallium/llvmpipe: add an optimised 32-bit memset
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=2a2fd4c5308dee51d48630863255f1c6a04768a9;p=mesa.git

gallium/llvmpipe: add an optimised 32-bit memset

This might have other users beyond filling/clearing buffers,

increase a fullscreen 4k gears from 68->74 fps on my Ryzen
since gears is really just a clear benchmark, and this helps
clearing.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4394>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4394>
---

diff --git a/src/gallium/auxiliary/util/u_surface.c b/src/gallium/auxiliary/util/u_surface.c
index 847c0008079..527e6662f0b 100644
--- a/src/gallium/auxiliary/util/u_surface.c
+++ b/src/gallium/auxiliary/util/u_surface.c
@@ -41,7 +41,7 @@
 #include "util/u_rect.h"
 #include "util/u_surface.h"
 #include "util/u_pack_color.h"
-
+#include "util/u_memset.h"
 
 /**
  * Initialize a pipe_surface object.  'view' is considered to have
@@ -141,9 +141,7 @@ util_fill_rect(ubyte * dst,
       break;
    case 4:
       for (i = 0; i < height; i++) {
-         uint32_t *row = (uint32_t *)dst;
-         for (j = 0; j < width; j++)
-            *row++ = uc->ui[0];
+         util_memset32(dst, uc->ui[0], width);
          dst += dst_stride;
       }
       break;
@@ -492,9 +490,7 @@ util_clear_depth_stencil_texture(struct pipe_context *pipe,
       case 4:
          if (!need_rmw) {
             for (i = 0; i < height; i++) {
-               uint32_t *row = (uint32_t *)dst_map;
-               for (j = 0; j < width; j++)
-                  *row++ = (uint32_t) zstencil;
+               util_memset32(dst_map, (uint32_t)zstencil, width);
                dst_map += dst_stride;
             }
          }
diff --git a/src/gallium/drivers/llvmpipe/lp_rast.c b/src/gallium/drivers/llvmpipe/lp_rast.c
index ef783ea6fb1..ad55ed7be79 100644
--- a/src/gallium/drivers/llvmpipe/lp_rast.c
+++ b/src/gallium/drivers/llvmpipe/lp_rast.c
@@ -33,7 +33,7 @@
 #include "util/u_pack_color.h"
 #include "util/u_string.h"
 #include "util/u_thread.h"
-
+#include "util/u_memset.h"
 #include "util/os_time.h"
 
 #include "lp_scene_queue.h"
@@ -236,9 +236,7 @@ lp_rast_clear_zstencil(struct lp_rasterizer_task *task,
          case 4:
             if (clear_mask == 0xffffffff) {
                for (i = 0; i < height; i++) {
-                  uint32_t *row = (uint32_t *)dst;
-                  for (j = 0; j < width; j++)
-                     *row++ = clear_value;
+                  util_memset32(dst, clear_value, width);
                   dst += dst_stride;
                }
             }
diff --git a/src/util/Makefile.sources b/src/util/Makefile.sources
index 644839bd09a..0e8fbb7ee85 100644
--- a/src/util/Makefile.sources
+++ b/src/util/Makefile.sources
@@ -119,6 +119,7 @@ MESA_UTIL_FILES := \
 	os_memory_stdc.h \
 	os_memory.h \
 	u_memory.h \
+	u_memset.h \
 	u_mm.h \
 	u_mm.c \
 	vma.c \
diff --git a/src/util/meson.build b/src/util/meson.build
index 0a2b2e4284e..ff25a9ea851 100644
--- a/src/util/meson.build
+++ b/src/util/meson.build
@@ -112,6 +112,7 @@ files_mesa_util = files(
   'u_vector.h',
   'u_math.c',
   'u_math.h',
+  'u_memset.h',
   'u_mm.c',
   'u_mm.h',
   'u_debug.c',
diff --git a/src/util/u_memset.h b/src/util/u_memset.h
new file mode 100644
index 00000000000..df8cf80b64a
--- /dev/null
+++ b/src/util/u_memset.h
@@ -0,0 +1,47 @@
+/**************************************************************************
+ *
+ * Copyright 2020 Red Hat
+ * All Rights Reserved.
+ *
+ * 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, sub license, 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 NON-INFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS AND/OR ITS SUPPLIERS 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.
+ *
+ **************************************************************************/
+
+#include "pipe/p_config.h"
+
+static inline void *
+util_memset32(void *s, uint32_t ui, size_t n)
+{
+#if defined(PIPE_CC_GCC) && defined(PIPE_ARCH_X86_64)
+   long d0, d1;
+   __asm__ volatile("rep\n\t"
+                    "stosl"
+                    : "=&c" (d0), "=&D" (d1)
+                    : "a" (ui), "1" (s), "0" (n)
+                    : "memory");
+   return s;
+#else
+   uint32_t *xs = (uint32_t *)s;
+   while (n--)
+      *xs++ = ui;
+   return s;
+#endif
+}