Szabolcs NagyandRich Felker
d28cd0ad42
from https://github.com/ARM-software/optimized-routines, commit 04884bd04eac4b251da4026900010ea7d8850edc POWF_SCALE != 1.0 case only matters if TOINT_INTRINSICS is set, which is currently not supported for any target. SNaN is not supported, it would require an issignalingf implementation. code size change: -816 bytes. benchmark on x86_64 before, after, speedup: -Os: powf rthruput: 95.14 ns/call 20.04 ns/call 4.75x powf latency: 137.00 ns/call 34.98 ns/call 3.92x -O3: powf rthruput: 92.48 ns/call 13.67 ns/call 6.77x powf latency: 131.11 ns/call 35.15 ns/call 3.73x
27 lines
555 B
C
27 lines
555 B
C
/*
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* Copyright (c) 2017-2018, Arm Limited.
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* SPDX-License-Identifier: MIT
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*/
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#ifndef _POWF_DATA_H
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#define _POWF_DATA_H
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#include "libm.h"
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#include "exp2f_data.h"
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#define POWF_LOG2_TABLE_BITS 4
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#define POWF_LOG2_POLY_ORDER 5
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#if TOINT_INTRINSICS
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#define POWF_SCALE_BITS EXP2F_TABLE_BITS
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#else
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#define POWF_SCALE_BITS 0
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#endif
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#define POWF_SCALE ((double)(1 << POWF_SCALE_BITS))
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extern hidden const struct powf_log2_data {
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struct {
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double invc, logc;
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} tab[1 << POWF_LOG2_TABLE_BITS];
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double poly[POWF_LOG2_POLY_ORDER];
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} __powf_log2_data;
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#endif
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