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| author | Szabolcs Nagy <nsz@port70.net> | 2018-12-01 01:09:01 +0000 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2019-04-17 23:45:40 -0400 |
| commit | e4dd65305a046019123ab34ebdcbe761a3a719ca (patch) | |
| tree | 292797b26ebc4794828c8f7fd46b9a7ef7374bc7 /src/math/pow_data.h | |
| parent | e16f7b3c02e17d0ace779a11f0d53a9c05fdd434 (diff) | |
| download | musl-e4dd65305a046019123ab34ebdcbe761a3a719ca.tar.gz musl-e4dd65305a046019123ab34ebdcbe761a3a719ca.tar.xz musl-e4dd65305a046019123ab34ebdcbe761a3a719ca.zip | |
math: new pow
from https://github.com/ARM-software/optimized-routines,
commit 04884bd04eac4b251da4026900010ea7d8850edc
The underflow exception is signaled if the result is in the subnormal
range even if the result is exact.
code size change: +3421 bytes.
benchmark on x86_64 before, after, speedup:
-Os:
pow rthruput: 102.96 ns/call 33.38 ns/call 3.08x
pow latency: 144.37 ns/call 54.75 ns/call 2.64x
-O3:
pow rthruput: 98.91 ns/call 32.79 ns/call 3.02x
pow latency: 138.74 ns/call 53.78 ns/call 2.58x
Diffstat (limited to 'src/math/pow_data.h')
| -rw-r--r-- | src/math/pow_data.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/math/pow_data.h b/src/math/pow_data.h new file mode 100644 index 00000000..5d609ae8 --- /dev/null +++ b/src/math/pow_data.h @@ -0,0 +1,22 @@ +/* + * Copyright (c) 2018, Arm Limited. + * SPDX-License-Identifier: MIT + */ +#ifndef _POW_DATA_H +#define _POW_DATA_H + +#include <features.h> + +#define POW_LOG_TABLE_BITS 7 +#define POW_LOG_POLY_ORDER 8 +extern hidden const struct pow_log_data { + double ln2hi; + double ln2lo; + double poly[POW_LOG_POLY_ORDER - 1]; /* First coefficient is 1. */ + /* Note: the pad field is unused, but allows slightly faster indexing. */ + struct { + double invc, pad, logc, logctail; + } tab[1 << POW_LOG_TABLE_BITS]; +} __pow_log_data; + +#endif |