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| 4 | #ifndef _PICK_H_
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| 5 | #define _PICK_H_
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| 6 |
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| 7 | |
| 8 | * Given the first two numbers __a and __b of arbitrarily many evenly spaced
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| 9 | * numbers, pick the 0-based __index'th value.
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| 10 | *
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| 11 | * Always prefer this over _PICK() if the numbers are evenly spaced.
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| 12 |
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| 13 | #define _PICK_EVEN(__index, __a, __b) ((__a) + (__index) * ((__b) - (__a)))
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| 14 |
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| 15 | |
| 16 | * Like _PICK_EVEN(), but supports 2 ranges of evenly spaced address offsets.
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| 17 | * @__c_index corresponds to the index in which the second range starts to be
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| 18 | * used. Using math interval notation, the first range is used for indexes [ 0,
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| 19 | * @__c_index), while the second range is used for [ @__c_index, ... ). Example:
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| 20 | *
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| 21 | * #define _FOO_A 0xf000
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| 22 | * #define _FOO_B 0xf004
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| 23 | * #define _FOO_C 0xf008
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| 24 | * #define _SUPER_FOO_A 0xa000
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| 25 | * #define _SUPER_FOO_B 0xa100
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| 26 | * #define FOO(x) _MMIO(_PICK_EVEN_2RANGES(x, 3, \
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| 27 | * _FOO_A, _FOO_B, \
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| 28 | * _SUPER_FOO_A, _SUPER_FOO_B))
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| 29 | *
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| 30 | * This expands to:
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| 31 | * 0: 0xf000,
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| 32 | * 1: 0xf004,
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| 33 | * 2: 0xf008,
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| 34 | * 3: 0xa000,
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| 35 | * 4: 0xa100,
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| 36 | * 5: 0xa200,
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| 37 | * ...
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| 38 |
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| 39 | #define _PICK_EVEN_2RANGES(__index, __c_index, __a, __b, __c, __d) \
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| 40 | (BUILD_BUG_ON_ZERO(!__is_constexpr(__c_index)) + \
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| 41 | ((__index) < (__c_index) ? _PICK_EVEN(__index, __a, __b) : \
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| 42 | _PICK_EVEN((__index) - (__c_index), __c, __d)))
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| 43 |
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| 44 | |
| 45 | * Given the arbitrary numbers in varargs, pick the 0-based __index'th number.
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| 46 | *
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| 47 | * Always prefer _PICK_EVEN() over this if the numbers are evenly spaced.
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| 48 |
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| 49 | #define _PICK(__index, ...) (((const u32 []){ __VA_ARGS__ })[__index])
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| 50 |
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| 51 | #endif
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