Rémi Denis-Courmont f0ef11ea83 lavc/bswapdsp: RISC-V B bswap_buf ... Simply taking the Zbb REV8 instruction into use in a simple loop gives some significant savings: bswap_buf_c: 1081.0 bswap_buf_rvb_b: 771.0 But we can also use the 64-bit REV8 as a pseudo-SIMD instruction with just one additional shift, and one fewer load, effectively doubling the bandwidth. Consequently, this patch is useful even if the compile-time target has Zbb enabled for C code: bswap_buf_c: 1081.0 bswap_buf_rvb_b: 341.0 (this patch) On the other hand, this approach fails miserably for bswap16_buf as the ratio of shifts and stores becomes unfavorable compared to naïve C: bswap16_buf_c: 1542.0 bswap16_buf_rvb_b: 1803.7 Unrolling to process 128 bits (4 samples) at a time actually worsens performance ever so slightly: bswap_buf_c: 1081.0 bswap_buf_rvb_b: 408.5		2022-10-05 08:26:19 +02:00
..
aacpsdsp_init.c	lavc/aacpsdsp: RISC-V V stereo_interpolate[0]	2022-09-27 13:19:52 +02:00
aacpsdsp_rvv.S	lavc/aacpsdsp: RISC-V V stereo_interpolate[0]	2022-09-27 13:19:52 +02:00
alacdsp_init.c	lavc/alacdsp: RISC-V V append_extra_bits[1]	2022-10-05 06:51:11 +02:00
alacdsp_rvv.S	riscv/alacdsp: drop config.h include	2022-10-05 06:59:43 +02:00
audiodsp_init.c	lavc/audiodsp: RISC-V V scalarproduct_int16	2022-09-27 13:19:52 +02:00
audiodsp_rvf.S
audiodsp_rvv.S	lavc/audiodsp: RISC-V V scalarproduct_int16	2022-09-27 13:19:52 +02:00
bswapdsp_init.c	lavc/bswapdsp: RISC-V B bswap_buf	2022-10-05 08:26:19 +02:00
bswapdsp_rvb.S	lavc/bswapdsp: RISC-V B bswap_buf	2022-10-05 08:26:19 +02:00
fmtconvert_init.c	riscv: Fix linking without RVV; change #ifdef into #if	2022-09-29 10:28:37 +03:00
fmtconvert_rvv.S	riscv: remove unnecessary #include's	2022-10-05 06:54:56 +02:00
idctdsp_init.c	lavc/idctdsp: RISC-V V put_signed_pixels_clamped function	2022-09-28 11:46:11 +02:00
idctdsp_rvv.S	riscv: remove unnecessary #include's	2022-10-05 06:54:56 +02:00
Makefile	lavc/bswapdsp: RISC-V B bswap_buf	2022-10-05 08:26:19 +02:00
pixblockdsp_init.c	lavc/pixblockdsp: RISC-V diff_pixels & diff_pixels_unaligned	2022-09-28 11:46:11 +02:00
pixblockdsp_rvi.S	riscv: remove unnecessary #include's	2022-10-05 06:54:56 +02:00
pixblockdsp_rvv.S	riscv: remove unnecessary #include's	2022-10-05 06:54:56 +02:00
vorbisdsp_init.c	lavc/vorbisdsp: RISC-V V inverse_coupling	2022-09-27 13:19:52 +02:00
vorbisdsp_rvv.S	riscv: remove unnecessary #include's	2022-10-05 06:54:56 +02:00