> It is surely silly that we don't have any mpn call for when it is known
> that the multiplier and multiplicand are distinct.
but now that mpn_sqr is in the GMP interface (since GMP 6 I guess), why
check for {up,un} = {vp,vn} in mpn_mul? Shouldn't the user or the GMP
developer call mpn_sqr directly?
In "make check" of GMP 6.1.2, the "square" branch of mpn_mul is taken only
in 4 tests: mpf/t-sqrt, mpf/t-sqrt_ui, mpf/reuse and mpf/t-pow_ui. It seems
some of those cases are because there is no mpf_sqr function, and mpf_mul
calls mpn_mul without checking for squares.
Paul
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