zstd decode: Use compound decSymbol #144
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The compiler is not generating very nice code when decSymbol is separate values. Use a compound value instead of a struct. ``` name old time/op new time/op delta Decoder_DecodeAll/kppkn.gtb.zst-12 610µs ± 1% 599µs ± 1% -1.84% (p=0.000 n=10+10) Decoder_DecodeAll/geo.protodata.zst-12 138µs ± 2% 136µs ± 0% -1.72% (p=0.000 n=10+9) Decoder_DecodeAll/plrabn12.txt.zst-12 1.95ms ± 1% 1.90ms ± 0% -2.19% (p=0.000 n=10+7) Decoder_DecodeAll/lcet10.txt.zst-12 1.46ms ± 2% 1.42ms ± 1% -2.48% (p=0.000 n=10+10) Decoder_DecodeAll/asyoulik.txt.zst-12 506µs ± 1% 497µs ± 1% -1.83% (p=0.000 n=10+9) Decoder_DecodeAll/alice29.txt.zst-12 655µs ± 1% 636µs ± 1% -2.97% (p=0.000 n=10+10) Decoder_DecodeAll/html_x_4.zst-12 267µs ± 1% 261µs ± 1% -2.43% (p=0.000 n=10+9) Decoder_DecodeAll/paper-100k.pdf.zst-12 25.0µs ± 1% 24.3µs ± 1% -2.61% (p=0.000 n=10+10) Decoder_DecodeAll/fireworks.jpeg.zst-12 9.65µs ± 1% 9.61µs ± 0% ~ (p=0.250 n=10+9) Decoder_DecodeAll/urls.10K.zst-12 1.67ms ± 1% 1.63ms ± 2% -2.29% (p=0.000 n=10+10) Decoder_DecodeAll/html.zst-12 156µs ± 1% 155µs ± 1% -0.85% (p=0.014 n=10+10) name old speed new speed delta Decoder_DecodeAll/kppkn.gtb.zst-12 302MB/s ± 1% 308MB/s ± 1% +1.88% (p=0.000 n=10+10) Decoder_DecodeAll/geo.protodata.zst-12 860MB/s ± 2% 875MB/s ± 0% +1.75% (p=0.000 n=10+9) Decoder_DecodeAll/plrabn12.txt.zst-12 248MB/s ± 1% 253MB/s ± 0% +2.24% (p=0.000 n=10+7) Decoder_DecodeAll/lcet10.txt.zst-12 293MB/s ± 2% 300MB/s ± 1% +2.54% (p=0.000 n=10+10) Decoder_DecodeAll/asyoulik.txt.zst-12 247MB/s ± 1% 252MB/s ± 1% +1.86% (p=0.000 n=10+9) Decoder_DecodeAll/alice29.txt.zst-12 232MB/s ± 1% 239MB/s ± 1% +3.06% (p=0.000 n=10+10) Decoder_DecodeAll/html_x_4.zst-12 1.53GB/s ± 1% 1.57GB/s ± 1% +2.49% (p=0.000 n=10+9) Decoder_DecodeAll/paper-100k.pdf.zst-12 4.10GB/s ± 1% 4.21GB/s ± 1% +2.68% (p=0.000 n=10+10) Decoder_DecodeAll/fireworks.jpeg.zst-12 12.8GB/s ± 1% 12.8GB/s ± 0% ~ (p=0.286 n=10+9) Decoder_DecodeAll/urls.10K.zst-12 420MB/s ± 1% 430MB/s ± 2% +2.35% (p=0.000 n=10+10) Decoder_DecodeAll/html.zst-12 655MB/s ± 1% 661MB/s ± 1% +0.86% (p=0.015 n=10+10) ```
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The compiler is not generating very nice code when decSymbol is separate values.
Use a compound value instead of a struct.