[Libre-soc-isa] [Bug 1192] New: dsrd / dsld need "add" option for knuth algorithm d

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=1192

            Bug ID: 1192
           Summary: dsrd / dsld need "add" option for knuth algorithm d
           Product: Libre-SOC's first SoC
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: CONFIRMED
          Severity: enhancement
          Priority: ---
         Component: Specification
          Assignee: lkcl at lkcl.net
          Reporter: shriya.sharma at redsemiconductor.com
                CC: libre-soc-isa at lists.libre-soc.org
   NLnet milestone: ---

in knuth algorithm d there is a shift-and-add.
this has been discussed before and is worth considering

--
        for (int i = 0; i <= n; i++)
        {
            uint64_t result = (((uint64_t)phi[i] << 32) | plo[i]) + carry;
            uint32_t result_high = result >> 32;
            if (carry <= 1)
                result_high++;
            carry = result_high;
            un[i + j] = (uint32_t)result;
        }

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