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| author | Szabolcs Nagy <nsz@port70.net> | 2018-12-01 00:53:54 +0000 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2019-04-17 23:45:13 -0400 |
| commit | 2a3210cf4abff0a69ff3e7adc66591dfe6ab2197 (patch) | |
| tree | 6fd3ac932c34d33a48c0604a7fcf5b1b8760b83d /src/math/log2_data.h | |
| parent | 236cd056e871acb8731cd84b5bfb6f0feb646589 (diff) | |
| download | musl-2a3210cf4abff0a69ff3e7adc66591dfe6ab2197.tar.gz musl-2a3210cf4abff0a69ff3e7adc66591dfe6ab2197.tar.xz musl-2a3210cf4abff0a69ff3e7adc66591dfe6ab2197.zip | |
math: new log2
from https://github.com/ARM-software/optimized-routines, commit 04884bd04eac4b251da4026900010ea7d8850edc code size change: +2458 bytes (+1524 bytes with fma). benchmark on x86_64 before, after, speedup: -Os: log2 rthruput: 16.08 ns/call 10.49 ns/call 1.53x log2 latency: 44.54 ns/call 25.55 ns/call 1.74x -O3: log2 rthruput: 15.92 ns/call 10.11 ns/call 1.58x log2 latency: 44.66 ns/call 26.16 ns/call 1.71x
Diffstat (limited to 'src/math/log2_data.h')
| -rw-r--r-- | src/math/log2_data.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/src/math/log2_data.h b/src/math/log2_data.h new file mode 100644 index 00000000..276a786d --- /dev/null +++ b/src/math/log2_data.h @@ -0,0 +1,28 @@ +/* + * Copyright (c) 2018, Arm Limited. + * SPDX-License-Identifier: MIT + */ +#ifndef _LOG2_DATA_H +#define _LOG2_DATA_H + +#include <features.h> + +#define LOG2_TABLE_BITS 6 +#define LOG2_POLY_ORDER 7 +#define LOG2_POLY1_ORDER 11 +extern hidden const struct log2_data { + double invln2hi; + double invln2lo; + double poly[LOG2_POLY_ORDER - 1]; + double poly1[LOG2_POLY1_ORDER - 1]; + struct { + double invc, logc; + } tab[1 << LOG2_TABLE_BITS]; +#if !__FP_FAST_FMA + struct { + double chi, clo; + } tab2[1 << LOG2_TABLE_BITS]; +#endif +} __log2_data; + +#endif |