From a5db5bda07fa3cec06024d1e18fcbcb855a37d37 Mon Sep 17 00:00:00 2001
From: Luca Barbato <lu_zero@gentoo.org>
Date: Thu, 12 Oct 2006 10:26:07 +0000
Subject: [PATCH] ppc generic prefetch
Originally committed as revision 6669 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
libavcodec/ppc/dsputil_ppc.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/libavcodec/ppc/dsputil_ppc.c b/libavcodec/ppc/dsputil_ppc.c
index 48076d25a30..b8502a0dd2d 100644
--- a/libavcodec/ppc/dsputil_ppc.c
+++ b/libavcodec/ppc/dsputil_ppc.c
@@ -249,10 +249,19 @@ long check_dcbzl_effect(void)
}
#endif
+static void prefetch_ppc(void *mem, int stride, int h)
+{
+ register const uint8_t *p = mem;
+ do {
+ asm volatile ("dcbt 0,%0" : : "r" (p));
+ p+= stride;
+ } while(--h);
+}
+
void dsputil_init_ppc(DSPContext* c, AVCodecContext *avctx)
{
// Common optimizations whether Altivec is available or not
-
+ c->prefetch = prefetch_ppc;
switch (check_dcbzl_effect()) {
case 32:
c->clear_blocks = clear_blocks_dcbz32_ppc;
--
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