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Diffstat (limited to 'src/base/bitfield.hh')
| -rw-r--r-- | src/base/bitfield.hh | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/src/base/bitfield.hh b/src/base/bitfield.hh index 64f192f6d..885b42288 100644 --- a/src/base/bitfield.hh +++ b/src/base/bitfield.hh @@ -1,4 +1,16 @@ /* + * Copyright (c) 2017 ARM Limited + * All rights reserved + * + * The license below extends only to copyright in the software and shall + * not be construed as granting a license to any other intellectual + * property including but not limited to intellectual property relating + * to a hardware implementation of the functionality of the software + * licensed hereunder. You may use the software subject to the license + * terms below provided that you ensure that this notice is replicated + * unmodified and in its entirety in all distributions of the software, + * modified or unmodified, in source code or in binary form. + * * Copyright (c) 2003-2005 The Regents of The University of Michigan * All rights reserved. * @@ -211,4 +223,29 @@ popCount(uint64_t val) { return (val * sum) >> 56; // horizontal sum #endif // defined(__GNUC__) || (defined(__clang__) && __has_builtin(__builtin_popcountl)) } + +/** + * Align to the next highest power of two. + * + * The number passed in is aligned to the next highest power of two, + * if it is not already a power of two. Please note that if 0 is + * passed in, 0 is returned. + * + * This code has been modified from the following: + * http://graphics.stanford.edu/~seander/bithacks.html#RoundUpPowerOf2 + */ +inline uint64_t alignToPowerOfTwo(uint64_t val) +{ + val--; + val |= val >> 1; + val |= val >> 2; + val |= val >> 4; + val |= val >> 8; + val |= val >> 16; + val |= val >> 32; + val++; + + return val; +}; + #endif // __BASE_BITFIELD_HH__ |