gh-69639: Add mixed-mode rules for complex arithmetic (C-like) (GH-124829)

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"Generally, mixed-mode arithmetic combining real and complex variables should
be performed directly, not by first coercing the real to complex, lest the sign
of zero be rendered uninformative; the same goes for combinations of pure
imaginary quantities with complex variables." (c) Kahan, W: Branch cuts for
complex elementary functions.

This patch implements mixed-mode arithmetic rules, combining real and
complex variables as specified by C standards since C99 (in particular,
there is no special version for the true division with real lhs
operand).  Most C compilers implementing C99+ Annex G have only these
special rules (without support for imaginary type, which is going to be
deprecated in C2y).

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Sergey B Kirpichev 2024-11-26 21:20:37 +03:00 • committed by GitHub

parent 6da9d252ac

commit f0d3f10c43

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