From 83f0bc5d8487aa491782d364e1da2e0f6d5a2641 Mon Sep 17 00:00:00 2001
From: Dave Airlie <airlied@redhat.com>
Date: Mon, 15 Feb 2021 07:50:38 +1000
Subject: [PATCH] util: add optimised memset64

This just adds a memset64 along the lines of the previously
added memset32.

Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9041>
---
 src/util/u_memset.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/src/util/u_memset.h b/src/util/u_memset.h
index df8cf80..46a43e5 100644
--- a/src/util/u_memset.h
+++ b/src/util/u_memset.h
@@ -45,3 +45,23 @@ util_memset32(void *s, uint32_t ui, size_t n)
    return s;
 #endif
 }
+
+static inline void *
+util_memset64(void *s, uint64_t ui, size_t n)
+{
+#if defined(PIPE_CC_GCC) && defined(PIPE_ARCH_X86_64)
+   long d0, d1;
+   __asm__ volatile("rep\n\t"
+                    "stosq"
+                    : "=&c" (d0), "=&D" (d1)
+                    : "a" (ui), "1" (s), "0" (n)
+                    : "memory");
+   return s;
+#else
+   uint64_t *xs = (uint64_t *)s;
+   while (n--)
+      *xs++ = ui;
+   return s;
+#endif
+
+}
-- 
2.7.4