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The prior coding of int64_div_fast_to_numeric() had a number of bugs that would cause it to fail under different circumstances, such as with log10val2 <= 0, or log10val2 a multiple of 4, or in the "slow" numeric path with log10val2 >= 10. None of those could be triggered by any of our current code, which only uses log10val2 = 3 or 6. However, they made it a hazard for any future code that might use it. Also, since this is exported by numeric.c, users writing their own C code might choose to use it. Therefore fix, and back-patch to v14, where it was introduced. Dean Rasheed, reviewed by Tom Lane. Discussion: https://postgr.es/m/CAEZATCW8gXgW0tgPxPgHDPhVX71%2BSWFRkhnXy%2BTfGDsKLepu2g%40mail.gmail.com