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Unit tests for bitexact_cos() and bitexact_log2tan().

--- a/libcelt/tests/mathops-test.c

+++ b/libcelt/tests/mathops-test.c

@@ -3,7 +3,12 @@

 #endif

 #include "mathops.c"

+#include "entenc.c"

+#include "entdec.c"

 #include "entcode.c"

+#include "bands.c"

+#include "vq.c"

+#include "cwrs.c"

 #include <stdio.h>

 #include <math.h>

@@ -57,6 +62,59 @@

    }

 }

+void testbitexactcos(void)

+{

+   int i;

+   opus_int32 min_d,max_d,last,chk;

+   chk=max_d=0;

+   last=min_d=32767;

+   for(i=0;i<16385;i++)

+   {

+      opus_int32 d;

+      opus_int32 q=bitexact_cos(i);

+      chk ^= q*i;

+      d = last - q;

+      if (d>max_d)max_d=d;

+      if (d<min_d)min_d=d;

+      last = q;

+   }

+   if ((chk!=91017006)||(max_d!=5)||(min_d!=0)||(bitexact_cos(0)!=32767)||

+       (bitexact_cos(16384)!=1)||(bitexact_cos(8192)!=23171))

+   {

+      fprintf (stderr, "bitexact_cos failed\n");

+      ret = 1;

+   }

+}

+

+void testbitexactlog2tan(void)

+{

+   int i,fail;

+   opus_int32 min_d,max_d,last,chk;

+   fail=chk=max_d=0;

+   last=min_d=30690;

+   for(i=0;i<8193;i++)

+   {

+      opus_int32 d;

+      opus_int32 mid=bitexact_cos(i);

+      opus_int32 side=bitexact_cos(16384-i);

+      opus_int32 q=bitexact_log2tan(mid,side);

+      chk ^= q*i;

+      d = last - q;

+      if (q!=-1*bitexact_log2tan(side,mid))

+        fail = 1;

+      if (d>max_d)max_d=d;

+      if (d<min_d)min_d=d;

+      last = q;

+   }

+   if ((chk!=16578548)||(max_d!=3219)||(min_d!=-2)||fail||

+       (bitexact_log2tan(32767,1)!=30690)||(bitexact_log2tan(30274,12540)!=2611)||

+       (bitexact_log2tan(23171,23171)!=0))

+   {

+      fprintf (stderr, "bitexact_log2tan failed\n");

+      ret = 1;

+   }

+}

+

 #ifndef FIXED_POINT

 void testlog2(void)

 {

@@ -160,6 +218,8 @@

 int main(void)

 {

+   testbitexactcos();

+   testbitexactlog2tan();

    testdiv();

    testsqrt();

    testlog2();