21 lines
480 B
Plaintext
21 lines
480 B
Plaintext
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// polynomial for approximating double precision tan(x)
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//
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// Copyright (c) 2023, Arm Limited.
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// SPDX-License-Identifier: MIT OR Apache-2.0 WITH LLVM-exception
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deg = 8;
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// interval bounds
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a = 0x1.0p-126;
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b = pi / 8;
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display = hexadecimal;
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f = (tan(sqrt(x))-sqrt(x))/x^(3/2);
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poly = fpminimax(f, deg, [|double ...|], [a*a;b*b]);
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//print("rel error:", accurateinfnorm(1-poly(x)/f(x), [a;b], 30));
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print("in [",a,b,"]");
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print("coeffs:");
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for i from 0 to deg do coeff(poly,i);
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