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Add bit manipulation functions

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We do need the unoptimized version of csrand_uniform() for high values
of `n`, since the optimized version depends on having __int128, and it's
not available on several platforms, including ARMv7, IA32, and MK68k.

This reverts commit 848f53c1d3c1362c86d3baab6906e1e4419d2634; however,
I applied some tweaks to the reverted commit.

Reported-by: Adam Sampson <ats@offog.org>
Cc: Iker Pedrosa <ipedrosa@redhat.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
This commit is contained in:
Alejandro Colomar
2023-01-30 12:43:34 +01:00
committed by Iker Pedrosa
parent 848f53c1d3
commit 0712b236c3
3 changed files with 68 additions and 0 deletions
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libmisc/bit.c Normal file
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/*
* SPDX-FileCopyrightText: 2022 - 2023, Alejandro Colomar <alx@kernel.org>
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <config.h>
#ident "$Id$"
#include "bit.h"
#include <limits.h>
extern inline unsigned long bit_ceilul(unsigned long x);
extern inline unsigned long bit_ceil_wrapul(unsigned long x);
extern inline int leading_zerosul(unsigned long x);