Philip Turner 09ece3bbcf [AutoDiff] Allow tgmath differentiation of Double (#40991) ...

This allows automatic differentiation of concrete calls to math functions operating on `Double`. Such calls were not differentiable because the concrete math functions were imported from C, not the generic ones defined in Swift. The fix is to define derivatives for these C functions. `test/AutoDiff/stdlib/tgmath_derivatives.swift.gyb` was modified to test the new functions.

2022-01-24 21:31:09 -08:00

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