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${ noResults }
1 Commits (cf7e2c5e055b6ad4dc629fcfadb40208d164c94c)
| Author | SHA1 | Message | Date |
|---|---|---|---|
Rémi Denis-Courmont
|
cec48e3b32 |
riscv: factor out the bswap32 assembler
|
1 year ago |
|
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 |
2 years ago |