int srcHiIndex = srcStart + (i + 1) * srcSizeBits - 1;
int srcLoIndex = srcStart + (i + 0) * srcSizeBits;
uint64_t argBits = bits(FpSrcReg1.uqw, srcHiIndex, srcLoIndex);
int srcHiIndex = srcStart + (i + 1) * srcSizeBits - 1;
int srcLoIndex = srcStart + (i + 0) * srcSizeBits;
uint64_t argBits = bits(FpSrcReg1.uqw, srcHiIndex, srcLoIndex);