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| author | Szabolcs Nagy <nsz@port70.net> | 2017-10-22 17:39:36 +0000 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2019-04-17 23:43:43 -0400 |
| commit | 098868b338e9afd3ef844070a94b9b10360d913f (patch) | |
| tree | 423730a900d0e74311a945fc014d961d3ba1d6ba /src/math/log2f_data.h | |
| parent | db505b794c697631f65e6b91ff106496debb86ac (diff) | |
| download | musl-098868b338e9afd3ef844070a94b9b10360d913f.tar.gz | |
math: new log2f
from https://github.com/ARM-software/optimized-routines,
commit 04884bd04eac4b251da4026900010ea7d8850edc
code size change: +177 bytes.
benchmark on x86_64 before, after, speedup:
-Os:
log2f rthruput: 11.38 ns/call 5.99 ns/call 1.9x
log2f latency: 35.01 ns/call 22.57 ns/call 1.55x
-O3:
log2f rthruput: 10.82 ns/call 5.58 ns/call 1.94x
log2f latency: 35.13 ns/call 21.04 ns/call 1.67x
Diffstat (limited to 'src/math/log2f_data.h')
| -rw-r--r-- | src/math/log2f_data.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/math/log2f_data.h b/src/math/log2f_data.h new file mode 100644 index 00000000..4fa48956 --- /dev/null +++ b/src/math/log2f_data.h @@ -0,0 +1,19 @@ +/* + * Copyright (c) 2017-2018, Arm Limited. + * SPDX-License-Identifier: MIT + */ +#ifndef _LOG2F_DATA_H +#define _LOG2F_DATA_H + +#include <features.h> + +#define LOG2F_TABLE_BITS 4 +#define LOG2F_POLY_ORDER 4 +extern hidden const struct log2f_data { + struct { + double invc, logc; + } tab[1 << LOG2F_TABLE_BITS]; + double poly[LOG2F_POLY_ORDER]; +} __log2f_data; + +#endif |