[Opus] Update to v1.2.1

third_party/opus/src/silk/fixed/schur64_FIX.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 25 matching lines @@
 opus_int32 silk_schur64(                            /* O    returns residual energy                                     */
     opus_int32                  rc_Q16[],           /* O    Reflection coefficients [order] Q16                         */
     const opus_int32            c[],                /* I    Correlations [order+1]                                      */
     opus_int32                  order               /* I    Prediction order                                            */
 )
 {
     opus_int   k, n;
     opus_int32 C[ SILK_MAX_ORDER_LPC + 1 ][ 2 ];
     opus_int32 Ctmp1_Q30, Ctmp2_Q30, rc_tmp_Q31;
 
-    silk_assert( order==6||order==8||order==10||order==12||order==14||order==16 );
+    silk_assert( order >= 0 && order <= SILK_MAX_ORDER_LPC );
 
     /* Check for invalid input */
     if( c[ 0 ] <= 0 ) {
         silk_memset( rc_Q16, 0, order * sizeof( opus_int32 ) );
         return 0;
     }
 
-    for( k = 0; k < order + 1; k++ ) {
+    k = 0;
+    do {
         C[ k ][ 0 ] = C[ k ][ 1 ] = c[ k ];
-    }
+    } while( ++k <= order );
 
     for( k = 0; k < order; k++ ) {
         /* Check that we won't be getting an unstable rc, otherwise stop here. */
         if (silk_abs_int32(C[ k + 1 ][ 0 ]) >= C[ 0 ][ 1 ]) {
            if ( C[ k + 1 ][ 0 ] > 0 ) {
               rc_Q16[ k ] = -SILK_FIX_CONST( .99f, 16 );
            } else {
               rc_Q16[ k ] = SILK_FIX_CONST( .99f, 16 );
            }
            k++;
@@ skipping 16 matching lines @@
             C[ n ][ 1 ]         = Ctmp2_Q30 + silk_SMMUL( silk_LSHIFT( Ctmp1_Q30, 1 ), rc_tmp_Q31 );
         }
     }
 
     for(; k < order; k++ ) {
        rc_Q16[ k ] = 0;
     }
 
     return silk_max_32( 1, C[ 0 ][ 1 ] );
 }