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stepantubanov/arm64-binary-to-hex.asm Secret

Last active June 5, 2021 03:41
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arm64 binary to hex
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arm64-binary-to-hex.asm
// Suggestion for https://codereview.stackexchange.com/questions/256828/binary-to-hex-in-arm64-simd-assembly
rev x1, x1
# x1 = low nibble
# x2 = high nibble
and x2, x1, #0xf0f0f0f0f0f0f0f0
lsr x2, x2, #4
and x1, x1, #0x0f0f0f0f0f0f0f0f
fmov d0, x1
fmov d1, x2
// Interleave
zip1 v0.16b, v1.16b, v0.16b
ldr q1, hex_table
tbl v0.16b, { v1.16b }, v0.16b
st1 { v0.16b }, [x0]
strb wzr, [x0, #16]
ret
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