79da079239
This commit also converts our own copyright headers to directly use SPDX, but leaves all other copyright header intact, only adding the SPDX ident. As far as possible this commit also merges multiple Data61 copyright statements/headers into one for consistency.
43 lines
965 B
C
43 lines
965 B
C
/*
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* Copyright 2020, Data61, CSIRO (ABN 41 687 119 230)
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*
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* SPDX-License-Identifier: GPL-2.0-only
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*/
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#ifndef __MODE_UTIL_H
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#define __MODE_UTIL_H
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#include <config.h>
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#include <types.h>
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#include <arch/model/statedata.h>
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static inline CONST uint64_t div64(uint64_t numerator, uint32_t denominator)
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{
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uint64_t quotient = 0llu;
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uint64_t long_denom = (uint64_t) denominator;
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if (unlikely(denominator > numerator)) {
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return 0;
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}
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assert(numerator > 0);
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assert(denominator > 0);
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/* align denominator to numerator */
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uint64_t c = ((uint64_t) 32u + clzl(denominator)) - clzll(numerator);
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long_denom = long_denom << c;
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/* perform binary long division */
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while (c < UINT64_MAX) {
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if (numerator >= long_denom) {
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numerator -= long_denom;
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quotient |= (1llu << c);
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}
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c--;
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long_denom = long_denom >> 1llu;
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}
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return quotient;
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}
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#endif /* __MODE_UTIL_H */
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