sh4 optimized idct & bswap patch by (BERO <bero at geocities dot co dot jp>)

Originally committed as revision 1877 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 114 insertions, 0 deletions

diff --git a/libavcodec/sh4/dsputil_sh4.c b/libavcodec/sh4/dsputil_sh4.c
new file mode 100644
index 0000000000..6cf5e72eaf
--- /dev/null
+++ b/libavcodec/sh4/dsputil_sh4.c
@@ -0,0 +1,114 @@
+/*
+ *  sh4 dsputil
+ *
+ * Copyright (c) 2003 BERO <bero@geocities.co.jp>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "../avcodec.h"
+#include "../dsputil.h"
+
+static void memzero_align8(void *dst,size_t size)
+{
+#if defined(__SH4__) || defined(__SH4_SINGLE__) || defined(__SH4_SINGLE_ONLY__)
+	(char*)dst+=size;
+	size/=8*4;
+	asm(
+#if defined(__SH4__)
+	" fschg\n"  //single float mode
+#endif
+	" fldi0 fr0\n"
+	" fldi0 fr1\n"
+	" fschg\n"  // double
+	"1: \n" \
+	" dt %1\n"
+	" fmov	dr0,@-%0\n"
+	" fmov	dr0,@-%0\n"
+	" fmov	dr0,@-%0\n"
+	" bf.s 1b\n"
+	" fmov	dr0,@-%0\n"
+#if defined(__SH4_SINGLE__) || defined(__SH4_SINGLE_ONLY__)
+	" fschg" //back to single
+#endif
+	: : "r"(dst),"r"(size): "memory" );
+#else
+	double *d = dst;
+	size/=8*4;
+	do {
+		d[0] = 0.0;
+		d[1] = 0.0;
+		d[2] = 0.0;
+		d[3] = 0.0;
+		d+=4;
+	} while(--size);
+#endif
+}
+
+static void clear_blocks_sh4(DCTELEM *blocks)
+{
+//	if (((int)blocks&7)==0) 
+	memzero_align8(blocks,sizeof(DCTELEM)*6*64);
+}
+
+extern void idct_sh4(DCTELEM *block);
+static void idct_put(uint8_t *dest, int line_size, DCTELEM *block)
+{
+	idct_sh4(block);
+	int i;
+	uint8_t *cm = cropTbl + MAX_NEG_CROP;
+	for(i=0;i<8;i++) {
+		dest[0] = cm[block[0]];
+		dest[1] = cm[block[1]];
+		dest[2] = cm[block[2]];
+		dest[3] = cm[block[3]];
+		dest[4] = cm[block[4]];
+		dest[5] = cm[block[5]];
+		dest[6] = cm[block[6]];
+		dest[7] = cm[block[7]];
+		dest+=line_size;
+		block+=8;
+	}
+}
+static void idct_add(uint8_t *dest, int line_size, DCTELEM *block)
+{
+	idct_sh4(block);
+	int i;
+	uint8_t *cm = cropTbl + MAX_NEG_CROP;
+	for(i=0;i<8;i++) {
+		dest[0] = cm[dest[0]+block[0]];
+		dest[1] = cm[dest[1]+block[1]];
+		dest[2] = cm[dest[2]+block[2]];
+		dest[3] = cm[dest[3]+block[3]];
+		dest[4] = cm[dest[4]+block[4]];
+		dest[5] = cm[dest[5]+block[5]];
+		dest[6] = cm[dest[6]+block[6]];
+		dest[7] = cm[dest[7]+block[7]];
+		dest+=line_size;
+		block+=8;
+	}
+}
+
+extern void dsputil_init_align(DSPContext* c, AVCodecContext *avctx);
+
+void dsputil_init_sh4(DSPContext* c, AVCodecContext *avctx)
+{
+	dsputil_init_align(c,avctx);
+
+	c->clear_blocks = clear_blocks_sh4;
+	c->idct_put = idct_put;
+	c->idct_add = idct_add;
+	c->idct_permutation_type= FF_NO_IDCT_PERM; //FF_SIMPLE_IDCT_PERM; //FF_LIBMPEG2_IDCT_PERM;
+}