Update to opus-HEAD-66611f1.

silk/A2NLSF.c

 /***********************************************************************
 Copyright (c) 2006-2011, Skype Limited. All rights reserved.
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met:
 - Redistributions of source code must retain the above copyright notice,
 this list of conditions and the following disclaimer.
 - Redistributions in binary form must reproduce the above copyright
 notice, this list of conditions and the following disclaimer in the
 documentation and/or other materials provided with the distribution.
@@ skipping 53 matching lines @@
     opus_int32          *p,                     /* I    Polynomial, Q16                         */
     const opus_int32    x,                      /* I    Evaluation point, Q12                   */
     const opus_int      dd                      /* I    Order                                   */
 )
 {
     opus_int   n;
     opus_int32 x_Q16, y32;
 
     y32 = p[ dd ];                                  /* Q16 */
     x_Q16 = silk_LSHIFT( x, 4 );
-    for( n = dd - 1; n >= 0; n-- ) {
-        y32 = silk_SMLAWW( p[ n ], y32, x_Q16 );    /* Q16 */
+
+    if ( opus_likely( 8 == dd ) )
+    {
+        y32 = silk_SMLAWW( p[ 7 ], y32, x_Q16 );
+        y32 = silk_SMLAWW( p[ 6 ], y32, x_Q16 );
+        y32 = silk_SMLAWW( p[ 5 ], y32, x_Q16 );
+        y32 = silk_SMLAWW( p[ 4 ], y32, x_Q16 );
+        y32 = silk_SMLAWW( p[ 3 ], y32, x_Q16 );
+        y32 = silk_SMLAWW( p[ 2 ], y32, x_Q16 );
+        y32 = silk_SMLAWW( p[ 1 ], y32, x_Q16 );
+        y32 = silk_SMLAWW( p[ 0 ], y32, x_Q16 );
+    }
+    else
+    {
+        for( n = dd - 1; n >= 0; n-- ) {
+            y32 = silk_SMLAWW( p[ n ], y32, x_Q16 );    /* Q16 */
+        }
     }
     return y32;
 }
 
 static OPUS_INLINE void silk_A2NLSF_init(
      const opus_int32    *a_Q16,
      opus_int32          *P,
      opus_int32          *Q,
      const opus_int      dd
 )
@@ skipping 157 matching lines @@
                     ylo = silk_A2NLSF_eval_poly( p, xlo, dd );
                     root_ix = 1;                  /* Index of current root */
                 } else {
                     root_ix = 0;                  /* Index of current root */
                 }
                 k = 1;                            /* Reset loop counter */
             }
         }
     }
 }