vc1_loop_filter() is only reached through the six C wrappers. Clang 14
keeps it out of line with plain static inline, adding a 224-byte stack
frame before the tiny bestcase path on rpi 5. gcc 12 already inlines
it.
rpi 5 clang 14:
before after
vc1_v_loop_filter4_bestcase_c 27.2 8.3 (3.3x)
vc1_h_loop_filter4_bestcase_c 26.4 10.2 (2.6x)
vc1_v_loop_filter8_bestcase_c 32.5 20.3 (1.6x)
vc1_h_loop_filter8_bestcase_c 31.7 19.5 (1.6x)
vc1_v_loop_filter16_bestcase_c 42.1 33.2 (1.3x)
vc1_h_loop_filter16_bestcase_c 41.6 25.3 (1.6x)
Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>
Zhao Zhili
520968debb