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Eliminate some promotions to double. A fair number of implicit promotions remain but they all involve math functions which exist only as double precision form in C89.

--- a/libcelt/celt.c

+++ b/libcelt/celt.c

@@ -212,7 +212,7 @@

       mem1 = x - SHR32(y,1);

 #else

       mem0 = mem1 + y - 2*x;

-      mem1 = x - .5*y;

+      mem1 = x - .5f*y;

 #endif

       tmp[i] = EXTRACT16(SHR(y,2));

    }

@@ -617,13 +617,13 @@

       }

       sum = MULT16_16_Q15(QCONST16(1.f/8, 15), sum);

       /*printf ("%f\n", sum);*/

-      if (sum > QCONST16(.995,10))

+      if (sum > QCONST16(.995f,10))

          trim_index-=3;

-      else if (sum > QCONST16(.92,10))

+      else if (sum > QCONST16(.92f,10))

          trim_index-=2;

-      else if (sum > QCONST16(.8,10))

+      else if (sum > QCONST16(.8f,10))

          trim_index-=1;

-      else if (sum < QCONST16(.4,10))

+      else if (sum < QCONST16(.4f,10))

          trim_index+=1;

    }

 #if 0

--- a/libcelt/plc.c

+++ b/libcelt/plc.c

@@ -83,7 +83,7 @@

          if (error<SHR32(ac[0],10))

             break;

 #else

-         if (error<.001*ac[0])

+         if (error<.001f*ac[0])

             break;

 #endif

       }