diff options
| author | Lynne <dev@lynne.ee> | 2022-08-09 03:31:11 +0200 |
|---|---|---|
| committer | Lynne <dev@lynne.ee> | 2022-08-09 03:35:12 +0200 |
| commit | 98b32ef462ba344b99034f7f85c2d66cfd7f0055 (patch) | |
| tree | b83124f39a599e26415803414013f092ee2ba867 /libavutil/x86/tx_float.asm | |
| parent | 5cdf4c0beda54c8fa5da7914c05b9ee28332c9b5 (diff) | |
| download | ffmpeg-98b32ef462ba344b99034f7f85c2d66cfd7f0055.tar.gz | |
x86/tx_float: save a branch during coefficient deinterleaving
Directly branch into the special 64-point deinterleave
subroutine rather than going through the general deinterleave.
64-point transform timings on Zen 3:
Before:
1974 decicycles in av_tx (fft),16776864 runs, 352 skips
After:
1956 decicycles in av_tx (fft),16775378 runs, 1838 skips
Diffstat (limited to 'libavutil/x86/tx_float.asm')
| -rw-r--r-- | libavutil/x86/tx_float.asm | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/libavutil/x86/tx_float.asm b/libavutil/x86/tx_float.asm index 21f99d3945..191af7d68f 100644 --- a/libavutil/x86/tx_float.asm +++ b/libavutil/x86/tx_float.asm @@ -1044,7 +1044,7 @@ ALIGN 16 add lutq, (mmsize/2)*8 %endif cmp tgtq, 64 - je .deinterleave + je .64pt_deint SPLIT_RADIX_COMBINE_64 @@ -1190,9 +1190,6 @@ FFT_SPLIT_RADIX_DEF 131072 ; Final synthesis + deinterleaving code ;=============================================================================== .deinterleave: - cmp lenq, 64 - je .64pt_deint - imul tmpq, lenq, 2 lea lutq, [4*lenq + tmpq] |