Alpha optimizations by Falk Hueffner <falk.hueffner@student.uni-tuebingen.de>

Originally committed as revision 274 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 223 insertions, 0 deletions

diff --git a/libavcodec/alpha/dsputil_alpha.c b/libavcodec/alpha/dsputil_alpha.c
new file mode 100644
index 0000000000..7212a659bd
--- /dev/null
+++ b/libavcodec/alpha/dsputil_alpha.c
@@ -0,0 +1,223 @@
+/*
+ * Alpha optimized DSP utils
+ * Copyright (c) 2002 Falk Hueffner <falk@debian.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "asm.h"
+#include "../dsputil.h"
+
+void simple_idct_axp(DCTELEM *block);
+
+static void put_pixels_clamped_axp(const DCTELEM *block, UINT8 *pixels, 
+				   int line_size)
+{
+    int i = 8;
+    do {
+	UINT64 shorts;
+
+	shorts = ldq(block);
+	shorts = maxsw4(shorts, 0);
+	shorts = minsw4(shorts, WORD_VEC(0x00ff));
+	stl(pkwb(shorts), pixels);
+
+	shorts = ldq(block + 4);
+	shorts = maxsw4(shorts, 0);
+	shorts = minsw4(shorts, WORD_VEC(0x00ff));
+	stl(pkwb(shorts), pixels + 4);
+
+	pixels += line_size;
+	block += 8;
+    } while (--i);
+}
+
+static void add_pixels_clamped_axp(const DCTELEM *block, UINT8 *pixels, 
+				   int line_size)
+{
+    int i = 8;
+    do {
+	UINT64 shorts; 
+
+	shorts = ldq(block);
+	shorts &= ~WORD_VEC(0x8000); /* clear highest bit to avoid overflow */
+	shorts += unpkbw(ldl(pixels));
+	shorts &= ~WORD_VEC(0x8000); /* hibit would be set for e. g. -2 + 3 */
+	shorts = minuw4(shorts, WORD_VEC(0x4000)); /* set neg. to 0x4000 */
+	shorts &= ~WORD_VEC(0x4000); /* ...and zap them */
+	shorts = minsw4(shorts, WORD_VEC(0x00ff)); /* clamp to 255 */
+	stl(pkwb(shorts), pixels);
+
+	/* next 4 */
+	shorts = ldq(block + 4);
+	shorts &= ~WORD_VEC(0x8000);
+	shorts += unpkbw(ldl(pixels + 4));
+	shorts &= ~WORD_VEC(0x8000);
+	shorts = minuw4(shorts, WORD_VEC(0x4000));
+	shorts &= ~WORD_VEC(0x4000);
+	shorts = minsw4(shorts, WORD_VEC(0x00ff));
+	stl(pkwb(shorts), pixels + 4);
+
+	pixels += line_size;
+	block += 8;
+    } while (--i);
+}
+
+/* Average 8 unsigned bytes in parallel: (b1 + b2) >> 1
+   Since the immediate result could be greater than 255, we do the
+   shift first. The result is too low by one if the bytes were both
+   odd, so we need to add (l1 & l2) & BYTE_VEC(0x01).  */
+static inline UINT64 avg2_no_rnd(UINT64 l1, UINT64 l2)
+{
+    UINT64 correction = (l1 & l2) & BYTE_VEC(0x01);
+    l1 = (l1 & ~BYTE_VEC(0x01)) >> 1;
+    l2 = (l2 & ~BYTE_VEC(0x01)) >> 1;
+    return l1 + l2 + correction;
+}
+
+/* Average 8 bytes with rounding: (b1 + b2 + 1) >> 1
+   The '1' only has an effect when one byte is even and the other odd,
+   i. e. we also need to add (l1 ^ l2) & BYTE_VEC(0x01).
+   Incidentally, that is equivalent to (l1 | l2) & BYTE_VEC(0x01).  */
+static inline UINT64 avg2(UINT64 l1, UINT64 l2)
+{
+    UINT64 correction = (l1 | l2) & BYTE_VEC(0x01);
+    l1 = (l1 & ~BYTE_VEC(0x01)) >> 1;
+    l2 = (l2 & ~BYTE_VEC(0x01)) >> 1;
+    return l1 + l2 + correction;
+}
+
+static inline UINT64 avg4(UINT64 l1, UINT64 l2, UINT64 l3, UINT64 l4)
+{
+    UINT64 r1 = ((l1 & ~BYTE_VEC(0x03)) >> 2)
+	      + ((l2 & ~BYTE_VEC(0x03)) >> 2)
+	      + ((l3 & ~BYTE_VEC(0x03)) >> 2)
+	      + ((l4 & ~BYTE_VEC(0x03)) >> 2);
+    UINT64 r2 = ((  (l1 & BYTE_VEC(0x03))
+		  + (l2 & BYTE_VEC(0x03))
+		  + (l3 & BYTE_VEC(0x03))
+		  + (l4 & BYTE_VEC(0x03))
+		  + BYTE_VEC(0x02)) >> 2) & BYTE_VEC(0x03);
+    return r1 + r2;
+}
+
+static inline UINT64 avg4_no_rnd(UINT64 l1, UINT64 l2, UINT64 l3, UINT64 l4)
+{
+    UINT64 r1 = ((l1 & ~BYTE_VEC(0x03)) >> 2)
+	      + ((l2 & ~BYTE_VEC(0x03)) >> 2)
+	      + ((l3 & ~BYTE_VEC(0x03)) >> 2)
+	      + ((l4 & ~BYTE_VEC(0x03)) >> 2);
+    UINT64 r2 = (( (l1 & BYTE_VEC(0x03))
+		 + (l2 & BYTE_VEC(0x03))
+		 + (l3 & BYTE_VEC(0x03))
+		 + (l4 & BYTE_VEC(0x03))
+		 + BYTE_VEC(0x01)) >> 2) & BYTE_VEC(0x03);
+    return r1 + r2;
+}
+
+#define PIXOPNAME(suffix) put ## suffix
+#define BTYPE UINT8
+#define AVG2 avg2
+#define AVG4 avg4
+#define STORE(l, b) stq(l, b)
+#include "pixops.h"
+#undef PIXOPNAME
+#undef BTYPE
+#undef AVG2
+#undef AVG4
+#undef STORE
+
+#define PIXOPNAME(suffix) put_no_rnd ## suffix
+#define BTYPE UINT8
+#define AVG2 avg2_no_rnd
+#define AVG4 avg4_no_rnd
+#define STORE(l, b) stq(l, b)
+#include "pixops.h"
+#undef PIXOPNAME
+#undef BTYPE
+#undef AVG2
+#undef AVG4
+#undef STORE
+
+/* The following functions are untested.  */
+#if 0
+
+#define PIXOPNAME(suffix) avg ## suffix
+#define BTYPE UINT8
+#define AVG2 avg2
+#define AVG4 avg4
+#define STORE(l, b) stq(AVG2(l, ldq(b)), b);
+#include "pixops.h"
+#undef PIXOPNAME
+#undef BTYPE
+#undef AVG2
+#undef AVG4
+#undef STORE
+
+#define PIXOPNAME(suffix) avg_no_rnd ## suffix
+#define BTYPE UINT8
+#define AVG2 avg2_no_rnd
+#define AVG4 avg4_no_rnd
+#define STORE(l, b) stq(AVG2(l, ldq(b)), b);
+#include "pixops.h"
+#undef PIXOPNAME
+#undef BTYPE
+#undef AVG2
+#undef AVG4
+#undef STORE
+
+#define PIXOPNAME(suffix) sub ## suffix
+#define BTYPE DCTELEM
+#define AVG2 avg2
+#define AVG4 avg4
+#define STORE(l, block) do {		\
+    UINT64 xxx = l;			\
+    (block)[0] -= (xxx >>  0) & 0xff;	\
+    (block)[1] -= (xxx >>  8) & 0xff;	\
+    (block)[2] -= (xxx >> 16) & 0xff;	\
+    (block)[3] -= (xxx >> 24) & 0xff;	\
+    (block)[4] -= (xxx >> 32) & 0xff;	\
+    (block)[5] -= (xxx >> 40) & 0xff;	\
+    (block)[6] -= (xxx >> 48) & 0xff;	\
+    (block)[7] -= (xxx >> 56) & 0xff;	\
+} while (0)
+#include "pixops.h"
+#undef PIXOPNAME
+#undef BTYPE
+#undef AVG2
+#undef AVG4
+#undef STORE
+
+#endif
+
+void dsputil_init_alpha(void)
+{
+    put_pixels_tab[0] = put_pixels_axp;
+    put_pixels_tab[1] = put_pixels_x2_axp;
+    put_pixels_tab[2] = put_pixels_y2_axp;
+    put_pixels_tab[3] = put_pixels_xy2_axp;
+
+    put_no_rnd_pixels_tab[0] = put_pixels_axp;
+    put_no_rnd_pixels_tab[1] = put_no_rnd_pixels_x2_axp;
+    put_no_rnd_pixels_tab[2] = put_no_rnd_pixels_y2_axp;
+    put_no_rnd_pixels_tab[3] = put_no_rnd_pixels_xy2_axp;
+
+    /* amask clears all bits that correspond to present features.  */
+    if (amask(AMASK_MVI) == 0) {
+	fprintf(stderr, "MVI extension detected\n");
+	put_pixels_clamped = put_pixels_clamped_axp;
+	add_pixels_clamped = add_pixels_clamped_axp;
+    }
+}