as a numeric constant: <code>\x</code> followed by exactly two hexadecimal
digits; <code>\u</code> followed by exactly four hexadecimal digits;
<code>\U</code> followed by exactly eight hexadecimal digits, and a
plain backslash <code>\</code> followed by exactly three octal digits.
In each case the value of the literal is the value represented by
the digits in the corresponding base.
</p>

<p>

*[{{$N}}*16]byte, src *[{{$N}}*16]byte, ivlo uint64, ivhi uint64) TEXT ·ctrBlocks{{ $N }}Asm(SB),NOSPLIT,$0 MOVD nr+0(FP), NR MOVD xk+8(FP), XK MOVD dst+16(FP), DST MOVD src+24(FP), SRC MOVD ivlo+32(FP), IV_LOW_LE MOVD ivhi+40(FP), IV_HIGH_LE {{/* Prepare plain from IV and blockIndex. */}} {{/* Copy to plaintext registers. */}} {{ range $i := xrange $N }} REV IV_LOW_LE, IV_LOW_BE REV IV_HIGH_LE, IV_HIGH_BE {{- /* https://developer.arm.com/documentation/dui0801/g/A64-SIMD-Vector-Instructions/MOV--vector--from-general-...