32 lines
638 B
C
32 lines
638 B
C
/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
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#ifndef __BITS_BPF_H
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#define __BITS_BPF_H
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#define READ_ONCE(x) (*(volatile typeof(x) *)&(x))
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#define WRITE_ONCE(x, val) ((*(volatile typeof(x) *)&(x)) = val)
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static __always_inline u64 log2(u32 v)
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{
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u32 shift, r;
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r = (v > 0xFFFF) << 4; v >>= r;
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shift = (v > 0xFF) << 3; v >>= shift; r |= shift;
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shift = (v > 0xF) << 2; v >>= shift; r |= shift;
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shift = (v > 0x3) << 1; v >>= shift; r |= shift;
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r |= (v >> 1);
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return r;
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}
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static __always_inline u64 log2l(u64 v)
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{
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u32 hi = v >> 32;
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if (hi)
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return log2(hi) + 32;
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else
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return log2(v);
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}
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#endif /* __BITS_BPF_H */
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