SuffixLoop:
	for i, a := range inst.Args {
		if a == nil {
			break
		}
		switch a := a.(type) {
		case Reg:
			switch inst.Op {
			case MOVSX, MOVZX:
				continue

			case SHL, SHR, RCL, RCR, ROL, ROR, SAR:
				if i == 1 {
					// shift count does not tell us operand size
					continue
				}

			case CRC32:
				// The source argument does tell us operand size,

		for i, x := range *c.regValues {
			if i > 0 {
				regs = regs + "; "
			}
			regs = regs + x.LongString()
		}
	}

	// not printing the config because that has not been useful
	return fmt.Sprintf("RCSR{storeDest=%v, regsLen=%d, nextSlice=%d, regValues=[%s]}", dest, len(c.regs), c.nextSlice, regs)
}

// next effectively post-increments the register cursor; the receiver is advanced,
// the (aligned) old value is returned.

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