F32/16 AVX2/AVX-512 packw use permi2w - #10983
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Benchmark on Intel Ice Lake: (f16-packw) - x16_avx2 (NR=16): 123.8 us (8.48 GB/s) -> 95.5 us (10.99 GB/s) (+29.5% faster) - x32_avx512skx (NR=32 prfm): 105.3 us (9.97 GB/s) -> 92.4 us (11.36 GB/s) (+13.9% faster) PiperOrigin-RevId: 971656623
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F32/16 AVX2/AVX-512 packw use permi2w
Benchmark on Intel Ice Lake: (f16-packw)