cmd: Some questions about adding arm64 SIMD instruction support

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Aug 28, 2020, 4:45:24 AM8/28/20

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case AVADD:

return 7<<25 | 1<<21 | 1<<15 | 1<<10

case AVAND:

return 7<<25 | 1<<21 | 7<<10

case AVAND:

return 7<<25 | 1<<21 | 7<<10

case AVCMEQ:

return 1<<29 | 0x71<<21 | 0x23<<10

For the AVADD instruction, how is 7,1,1,1 determined? How is 25,21,15,10 determined? What do they mean? Why are the other commands different?

Can someone explain to me briefly? Thank you.

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Aug 28, 2020, 4:47:30 AM8/28/20

to golang-nuts

I forgot to say that this code is in src/cmd/internal/obj/arm64/asm7.go

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