From 150c9823e71a161e97003849cf8b2f55b21520bd Mon Sep 17 00:00:00 2001
From: Tim Redfern <tim@eclectronics.org>
Date: Mon, 26 Aug 2013 15:10:18 +0100
Subject: adding ffmpeg specific version

---
 ffmpeg1/libavcodec/ppc/gmc_altivec.c | 130 +++++++++++++++++++++++++++++++++++
 1 file changed, 130 insertions(+)
 create mode 100644 ffmpeg1/libavcodec/ppc/gmc_altivec.c

(limited to 'ffmpeg1/libavcodec/ppc/gmc_altivec.c')

diff --git a/ffmpeg1/libavcodec/ppc/gmc_altivec.c b/ffmpeg1/libavcodec/ppc/gmc_altivec.c
new file mode 100644
index 0000000..4db761d
--- /dev/null
+++ b/ffmpeg1/libavcodec/ppc/gmc_altivec.c
@@ -0,0 +1,130 @@
+/*
+ * GMC (Global Motion Compensation)
+ * AltiVec-enabled
+ * Copyright (c) 2003 Romain Dolbeau <romain@dolbeau.org>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/mem.h"
+#include "libavutil/ppc/types_altivec.h"
+#include "libavutil/ppc/util_altivec.h"
+#include "dsputil_altivec.h"
+
+/*
+  altivec-enhanced gmc1. ATM this code assume stride is a multiple of 8,
+  to preserve proper dst alignment.
+*/
+void ff_gmc1_altivec(uint8_t *dst /* align 8 */, uint8_t *src /* align1 */, int stride, int h, int x16, int y16, int rounder)
+{
+    const DECLARE_ALIGNED(16, unsigned short, rounder_a) = rounder;
+    const DECLARE_ALIGNED(16, unsigned short, ABCD)[8] =
+        {
+            (16-x16)*(16-y16), /* A */
+            (   x16)*(16-y16), /* B */
+            (16-x16)*(   y16), /* C */
+            (   x16)*(   y16), /* D */
+            0, 0, 0, 0         /* padding */
+        };
+    register const vector unsigned char vczero = (const vector unsigned char)vec_splat_u8(0);
+    register const vector unsigned short vcsr8 = (const vector unsigned short)vec_splat_u16(8);
+    register vector unsigned char dstv, dstv2, src_0, src_1, srcvA, srcvB, srcvC, srcvD;
+    register vector unsigned short Av, Bv, Cv, Dv, rounderV, tempA, tempB, tempC, tempD;
+    int i;
+    unsigned long dst_odd = (unsigned long)dst & 0x0000000F;
+    unsigned long src_really_odd = (unsigned long)src & 0x0000000F;
+
+    tempA = vec_ld(0, (const unsigned short*)ABCD);
+    Av = vec_splat(tempA, 0);
+    Bv = vec_splat(tempA, 1);
+    Cv = vec_splat(tempA, 2);
+    Dv = vec_splat(tempA, 3);
+
+    rounderV = vec_splat((vec_u16)vec_lde(0, &rounder_a), 0);
+
+    // we'll be able to pick-up our 9 char elements
+    // at src from those 32 bytes
+    // we load the first batch here, as inside the loop
+    // we can re-use 'src+stride' from one iteration
+    // as the 'src' of the next.
+    src_0 = vec_ld(0, src);
+    src_1 = vec_ld(16, src);
+    srcvA = vec_perm(src_0, src_1, vec_lvsl(0, src));
+
+    if (src_really_odd != 0x0000000F) {
+        // if src & 0xF == 0xF, then (src+1) is properly aligned
+        // on the second vector.
+        srcvB = vec_perm(src_0, src_1, vec_lvsl(1, src));
+    } else {
+        srcvB = src_1;
+    }
+    srcvA = vec_mergeh(vczero, srcvA);
+    srcvB = vec_mergeh(vczero, srcvB);
+
+    for(i=0; i<h; i++) {
+        dst_odd = (unsigned long)dst & 0x0000000F;
+        src_really_odd = (((unsigned long)src) + stride) & 0x0000000F;
+
+        dstv = vec_ld(0, dst);
+
+        // we we'll be able to pick-up our 9 char elements
+        // at src + stride from those 32 bytes
+        // then reuse the resulting 2 vectors srvcC and srcvD
+        // as the next srcvA and srcvB
+        src_0 = vec_ld(stride + 0, src);
+        src_1 = vec_ld(stride + 16, src);
+        srcvC = vec_perm(src_0, src_1, vec_lvsl(stride + 0, src));
+
+        if (src_really_odd != 0x0000000F) {
+            // if src & 0xF == 0xF, then (src+1) is properly aligned
+            // on the second vector.
+            srcvD = vec_perm(src_0, src_1, vec_lvsl(stride + 1, src));
+        } else {
+            srcvD = src_1;
+        }
+
+        srcvC = vec_mergeh(vczero, srcvC);
+        srcvD = vec_mergeh(vczero, srcvD);
+
+
+        // OK, now we (finally) do the math :-)
+        // those four instructions replaces 32 int muls & 32 int adds.
+        // isn't AltiVec nice ?
+        tempA = vec_mladd((vector unsigned short)srcvA, Av, rounderV);
+        tempB = vec_mladd((vector unsigned short)srcvB, Bv, tempA);
+        tempC = vec_mladd((vector unsigned short)srcvC, Cv, tempB);
+        tempD = vec_mladd((vector unsigned short)srcvD, Dv, tempC);
+
+        srcvA = srcvC;
+        srcvB = srcvD;
+
+        tempD = vec_sr(tempD, vcsr8);
+
+        dstv2 = vec_pack(tempD, (vector unsigned short)vczero);
+
+        if (dst_odd) {
+            dstv2 = vec_perm(dstv, dstv2, vcprm(0,1,s0,s1));
+        } else {
+            dstv2 = vec_perm(dstv, dstv2, vcprm(s0,s1,2,3));
+        }
+
+        vec_st(dstv2, 0, dst);
+
+        dst += stride;
+        src += stride;
+    }
+}
-- 
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