Fix the behavior of ``copysign``, ``mulsign``, etc.

mitsuba-renderer / drjit

Dr.Jit — A Just-In-Time-Compiler for Differentiable Rendering

BSD 3-Clause "New" or "Revised" License

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Fix the behavior of ``copysign``, ``mulsign``, etc. #300

Closed wjakob closed 1 month ago

wjakob commented 1 month ago

Extracting the sign bit using comparison operators is not portable across platforms. This commit makes operations like of copysign, mulsign, etc., examine the actual bit pattern.