FFT: reduce stack and harmonize functions

vaclavrequested to merge
OPTIMIZE_FFT_STACK into main
  • Related issues: #2365
  • Requested reviewers:

Reason why this change is needed

  • Removal of duplicated functions and reduction of highest stack

Description of the change

  • OPTIMIZE_FFT_STACK
    • removal of intermediate FFT buffer from fft_fx(): 7,680 Bytes
    • move intermediate buffer out of the highest stack in ivas_mdct_core_whitening_enc_fx(): 9,600 Bytes
  • HARMONIZE_DCT - removal of duplicated functions
  • Saves:
    • 17,280 Bytes from highest stack (both encoder and decoder)
    • 8,000 Bytes of Table ROM
    • ~400 lines of source code

Affected operating points

  • All is BE.
Edited by vaclav

Merge request reports