sha3.c: permute_n_avx2(): replace some permutes with blends, minor cleanups

with these changes:
- clang: avx2 comparable to scalar
- gcc: avx2 still slower than scalar

bench results
-------------
gcc scalar:
  > make clean all BACKEND=1 CC=gcc && ./bench
  info: cpucycles: version=20240318 implementation=amd64-pmc persecond=4800000000
  info: backend=scalar num_trials=2000 src_lens=64,256,1024,4096,16384 dst_lens=32
  function,dst_len,64,256,1024,4096,16384
  sha3_224,28,19.5,10.0,9.9,9.0,8.8
  sha3_256,32,19.5,10.0,9.9,9.5,9.3
  sha3_384,48,19.5,14.7,12.3,12.2,12.0
  sha3_512,64,19.5,19.6,18.2,17.1,17.1
  shake128,32,19.6,9.9,8.7,7.8,7.6
  shake256,32,19.6,9.9,10.0,9.5,9.3

gcc avx2:
  > make clean all BACKEND=6 CC=gcc && ./bench
  info: cpucycles: version=20240318 implementation=amd64-pmc persecond=4800000000
  info: backend=avx2 num_trials=2000 src_lens=64,256,1024,4096,16384 dst_lens=32
  function,dst_len,64,256,1024,4096,16384
  sha3_224,28,24.5,12.3,12.2,11.1,10.9
  sha3_256,32,24.4,12.2,12.2,11.9,11.6
  sha3_384,48,24.2,18.3,15.3,15.2,15.0
  sha3_512,64,24.5,24.4,22.8,21.6,21.6
  shake128,32,24.6,12.1,10.8,9.6,9.4
  shake256,32,24.7,12.2,12.2,11.8,11.6

clang scalar:
  > make clean all BACKEND=1 CC=clang && ./bench
  info: cpucycles: version=20240318 implementation=amd64-pmc persecond=4800000000
  info: backend=scalar num_trials=2000 src_lens=64,256,1024,4096,16384 dst_lens=32
  function,dst_len,64,256,1024,4096,16384
  sha3_224,28,21.8,9.9,9.7,8.8,8.7
  sha3_256,32,21.1,9.9,9.8,9.4,9.2
  sha3_384,48,21.1,14.6,12.1,12.0,11.8
  sha3_512,64,21.2,19.2,17.9,16.9,16.9
  shake128,32,21.0,9.9,8.6,7.7,7.5
  shake256,32,20.9,9.9,9.8,9.5,9.2

clang avx2:
  > make clean all BACKEND=6 CC=clang && ./bench
  info: cpucycles: version=20240318 implementation=amd64-pmc persecond=4800000000
  info: backend=avx2 num_trials=2000 src_lens=64,256,1024,4096,16384 dst_lens=32
  function,dst_len,64,256,1024,4096,16384
  sha3_224,28,19.9,10.0,9.9,9.0,8.9
  sha3_256,32,19.9,10.0,9.9,9.6,9.4
  sha3_384,48,20.1,14.9,12.4,12.3,12.2
  sha3_512,64,19.9,19.6,18.4,17.4,17.4
  shake128,32,19.9,10.0,8.8,7.9,7.7
  shake256,32,20.0,10.0,9.9,9.6,9.4

0 files changed, 0 insertions, 0 deletions