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/external/aac/libFDK/include/
H A Dfixpoint_math.h770 * \brief calculate logarithm of base 2 of x_m * 2^(x_e)
771 * \param x_m mantissa of the input value.
776 FDK_INLINE FIXP_DBL fLog2(FIXP_DBL x_m, INT x_e, INT *result_e) { argument
780 if (x_m <= FL2FXCONST_DBL(0.0f)) {
789 /* Move input value x_m * 2^x_e toward 1.0, where the taylor approximation
794 b_norm = fNormz(x_m) - 1;
795 x2_m = x_m << b_norm;
818 /* Add exponent part. log2(x_m * 2^x_e) = log2(x_m) + x_e */
840 * \brief calculate logarithm of base 2 of x_m *
845 fLog2(FIXP_DBL x_m, INT x_e) argument
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