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Diffstat (limited to 'pl/math/tools/expm1f.sollya')
-rw-r--r-- | pl/math/tools/expm1f.sollya | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/pl/math/tools/expm1f.sollya b/pl/math/tools/expm1f.sollya new file mode 100644 index 0000000..efdf1bd --- /dev/null +++ b/pl/math/tools/expm1f.sollya @@ -0,0 +1,21 @@ +// polynomial for approximating exp(x)-1 in single precision +// +// Copyright (c) 2022-2023, Arm Limited. +// SPDX-License-Identifier: MIT OR Apache-2.0 WITH LLVM-exception + +deg = 5; + +a = -log(2)/2; +b = log(2)/2; + +f = proc(y) { + return exp(y)-1; +}; + +poly = fpminimax(f(x), deg, [|single ...|], [a;b]); + +display = hexadecimal; +print("rel error:", accurateinfnorm(1-poly(x)/f(x), [a;b], 30)); +print("in [",a,b,"]"); +print("coeffs:"); +for i from 2 to deg do round(coeff(poly,i), SG, RN); |