if constexpr()

in gemmology.h [815:840]

• 18 lines of code
• 3 McCabe index (conditional complexity)

    if constexpr (batchf32::size == 16) {
      const batch8 neg127(-127);
      // In reverse order: grabbing the first 32-bit values from each 128-bit
      // register, then the second 32-bit values, etc. Grab 4 registers at a
      // time in 32-bit format.
      batch32 g0 =
          QuantizerGrabHalves(input + 0 * cols, input + 2 * cols, quant_mult);
      batch32 g1 =
          QuantizerGrabHalves(input + 16 * cols, input + 18 * cols, quant_mult);
      batch32 g2 =
          QuantizerGrabHalves(input + 32 * cols, input + 34 * cols, quant_mult);
      batch32 g3 =
          QuantizerGrabHalves(input + 48 * cols, input + 50 * cols, quant_mult);

      // Pack 32-bit to 16-bit.
      batch16 packed0 = deinterleave(g0, g1);
      batch16 packed1 = deinterleave(g2, g3);
      // Pack 16-bit to 8-bit.
      batch8 packed = deinterleave(packed0, packed1);
      // Ban -128.
      packed = xsimd::max(packed, neg127);

      return xsimd::bitwise_cast<int8_t>(
          xsimd::swizzle(xsimd::bitwise_cast<int32_t>(packed),
                         xsimd::make_batch_constant<uint32_t, Arch, Tiler<Arch>>()));
    } else if constexpr (batchf32::size == 8)