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8806311bb7
This patch adds the erfc op to the math dialect. It also does lowering of the math.erfc op to libm calls. There is also a f32 polynomial approximation for the function based on https://stackoverflow.com/questions/35966695/vectorizable-implementation-of-complementary-error-function-erfcf This is in turn based on M. M. Shepherd and J. G. Laframboise, "Chebyshev Approximation of (1+2x)exp(x^2)erfc x in 0 <= x < INF", Mathematics of Computation, Vol. 36, No. 153, January 1981, pp. 249-253. The code has a ULP error less than 3, which was tested, and MLIR test values were verified against the C implementation.