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| author | Elliott Hughes <enh@google.com> | 2023-01-25 16:31:42 +0000 |
|---|---|---|
| committer | Elliott Hughes <enh@google.com> | 2023-01-25 18:11:56 +0000 |
| commit | 62662f115a17a5548402fcd02f3b7e1b9b38e087 (patch) | |
| tree | 945eb1832687ad5eb97c433013617dbe107718e5 /pl/math/tools/atanf.sollya | |
| parent | 04d0bc466ce39c702459d77a15754a19533eaec9 (diff) | |
| parent | 56e3bf05c19c4e28e1f5edd9093c712f16c5c32a (diff) | |
| download | arm-optimized-routines-62662f115a17a5548402fcd02f3b7e1b9b38e087.tar.gz | |
Upgrade ARM-software/optimized-routines to v23.01
This project was upgraded with external_updater.
Usage: tools/external_updater/updater.sh update arm-optimized-routines
For more info, check https://cs.android.com/android/platform/superproject/+/master:tools/external_updater/README.md
Test: TreeHugger
Change-Id: I03de0ecb0ea89c2a77b1c411685af09fd480b63e
Diffstat (limited to 'pl/math/tools/atanf.sollya')
| -rw-r--r-- | pl/math/tools/atanf.sollya | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/pl/math/tools/atanf.sollya b/pl/math/tools/atanf.sollya new file mode 100644 index 0000000..ed88d0b --- /dev/null +++ b/pl/math/tools/atanf.sollya @@ -0,0 +1,20 @@ +// polynomial for approximating atanf(x) +// +// Copyright (c) 2022-2023, Arm Limited. +// SPDX-License-Identifier: MIT OR Apache-2.0 WITH LLVM-exception + +// Generate list of monomials: +// Taylor series of atan is of the form x + ax^3 + bx^5 + cx^7 + ... +// So generate a, b, c, ... such that we can approximate atan(x) by: +// x + x^3 * (a + bx^2 + cx^4 + ...) + +deg = 7; + +a = 1.1754943508222875e-38; +b = 1; + +poly = fpminimax((atan(sqrt(x))-sqrt(x))/x^(3/2), deg, [|single ...|], [a;b]); + +display = hexadecimal; +print("coeffs:"); +for i from 0 to deg do coeff(poly,i); |