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Making it obvious to the compiler how to generate a dual-MAC in
mix_pitch_and_residual()

--- a/libcelt/vq.c

+++ b/libcelt/vq.c

@@ -66,13 +66,14 @@

       y[i] = SHL16(iy[i],yshift);

    Ryp = 0;

-   for (i=0;i<N;i++)

-      Ryp = MAC16_16(Ryp,y[i],P[i]);

-

    Ryy = 0;

+   /* If this doesn't generate a dual MAC (on supported archs), fire the compiler guy */

    for (i=0;i<N;i++)

-      Ryy = MAC16_16(Ryy, y[i],y[i]);

-

+   {

+      Ryp = MAC16_16(Ryp, y[i], P[i]);

+      Ryy = MAC16_16(Ryy, y[i], y[i]);

+   }

+   

    /* g = (sqrt(Ryp^2 + Ryy - Rpp*Ryy)-Ryp)/Ryy */

    g = MULT16_32_Q15(

             celt_sqrt(MULT16_16(ROUND16(Ryp,14),ROUND16(Ryp,14)) + Ryy -