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Adds SIG2WORD16() to fixed_debug.h

--- a/celt/fixed_debug.h

+++ b/celt/fixed_debug.h

@@ -768,6 +768,16 @@

    return res;

 }

+static OPUS_INLINE opus_val16 SIG2WORD16_generic(celt_sig x)

+{

+   x = PSHR32(x, SIG_SHIFT);

+   x = MAX32(x, -32768);

+   x = MIN32(x, 32767);

+   return EXTRACT16(x);

+}

+#define SIG2WORD16(x) (SIG2WORD16_generic(x))

+

+

 #undef PRINT_MIPS

 #define PRINT_MIPS(file) do {fprintf (file, "total complexity = %llu MIPS\n", celt_mips);} while (0);