altivec jumbo patch by (Romain Dolbeau <dolbeaur at club-internet dot fr>)

Originally committed as revision 1448 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 159 insertions, 0 deletions

diff --git a/libavcodec/ppc/gmc_altivec.c b/libavcodec/ppc/gmc_altivec.c
new file mode 100644
index 0000000000..aef1f54426
--- /dev/null
+++ b/libavcodec/ppc/gmc_altivec.c
@@ -0,0 +1,159 @@
+/*
+ * GMC (???)
+ * AltiVec-enabled
+ * Copyright (c) 2003 Romain Dolbeau <romain@dolbeau.org>
+ *
+ * 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 "../dsputil.h"
+
+#include "dsputil_altivec.h"
+
+/*
+  altivec-enhanced gmc1. ATM this code assume stride is a multiple of 8,
+  to preserve proper dst alignement.
+*/
+void gmc1_altivec(UINT8 *dst /* align 8 */, UINT8 *src /* align1 */, int stride, int h, int x16, int y16, int rounder)
+{
+#if 0
+    const int A=(16-x16)*(16-y16);
+    const int B=(   x16)*(16-y16);
+    const int C=(16-x16)*(   y16);
+    const int D=(   x16)*(   y16);
+    
+    int i;
+    
+    for(i=0; i<h; i++)
+    {
+        dst[0]= (A*src[0] + B*src[1] + C*src[stride+0] + D*src[stride+1] + rounder)>>8;
+        dst[1]= (A*src[1] + B*src[2] + C*src[stride+1] + D*src[stride+2] + rounder)>>8;
+        dst[2]= (A*src[2] + B*src[3] + C*src[stride+2] + D*src[stride+3] + rounder)>>8;
+        dst[3]= (A*src[3] + B*src[4] + C*src[stride+3] + D*src[stride+4] + rounder)>>8;
+        dst[4]= (A*src[4] + B*src[5] + C*src[stride+4] + D*src[stride+5] + rounder)>>8;
+        dst[5]= (A*src[5] + B*src[6] + C*src[stride+5] + D*src[stride+6] + rounder)>>8;
+        dst[6]= (A*src[6] + B*src[7] + C*src[stride+6] + D*src[stride+7] + rounder)>>8;
+        dst[7]= (A*src[7] + B*src[8] + C*src[stride+7] + D*src[stride+8] + rounder)>>8;
+        dst+= stride;
+        src+= stride;
+    }
+#else
+    const unsigned short __attribute__ ((aligned(16))) rounder_a[8] =
+      {rounder, rounder, rounder, rounder,
+       rounder, rounder, rounder, rounder};
+    const unsigned short __attribute__ ((aligned(16))) 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)(0);
+    register const vector unsigned short vcsr8 = (const vector unsigned short)(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, (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_ld(0, (unsigned short*)rounder_a);
+    
+    // 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;
+    }
+#endif
+}