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Optimizations to SPAR decoder functions

Arthur Tritthart requested to merge 1101-IVAS-SPAR-DEC-UPMIXER-SF into main
  • Replaced some L_add_sat+Mpy_32_16_1 using Word16 by Madd_32_32 using Word32 (better accuracy)
  • Computed often used shift operand only once outside the loop
  • divided cldfb loop with inner IF-statements into 2 loops without inner IF-statements
  • replaced smoothing constant 16-Bit values for 1/6 and 1/20 by 32-Bit values (better accuracy) The output file is slightly different (9e-5), the WMOPS are reduced by 34 (max. 150 -> 116).

Closes #1101 (closed)

Edited by Arthur Tritthart

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