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/* SPDX-License-Identifier: MIT */
/* Copyright © 2026 Intel Corporation */
#ifndef _PICK_H_
#define _PICK_H_
/*
* Given the first two numbers __a and __b of arbitrarily many evenly spaced
* numbers, pick the 0-based __index'th value.
*
* Always prefer this over _PICK() if the numbers are evenly spaced.
*/
#define _PICK_EVEN(__index, __a, __b) ((__a) + (__index) * ((__b) - (__a)))
/*
* Like _PICK_EVEN(), but supports 2 ranges of evenly spaced address offsets.
* @__c_index corresponds to the index in which the second range starts to be
* used. Using math interval notation, the first range is used for indexes [ 0,
* @__c_index), while the second range is used for [ @__c_index, ... ). Example:
*
* #define _FOO_A 0xf000
* #define _FOO_B 0xf004
* #define _FOO_C 0xf008
* #define _SUPER_FOO_A 0xa000
* #define _SUPER_FOO_B 0xa100
* #define FOO(x) _MMIO(_PICK_EVEN_2RANGES(x, 3, \
* _FOO_A, _FOO_B, \
* _SUPER_FOO_A, _SUPER_FOO_B))
*
* This expands to:
* 0: 0xf000,
* 1: 0xf004,
* 2: 0xf008,
* 3: 0xa000,
* 4: 0xa100,
* 5: 0xa200,
* ...
*/
#define _PICK_EVEN_2RANGES(__index, __c_index, __a, __b, __c, __d) \
(BUILD_BUG_ON_ZERO(!__is_constexpr(__c_index)) + \
((__index) < (__c_index) ? _PICK_EVEN(__index, __a, __b) : \
_PICK_EVEN((__index) - (__c_index), __c, __d)))
/*
* Given the arbitrary numbers in varargs, pick the 0-based __index'th number.
*
* Always prefer _PICK_EVEN() over this if the numbers are evenly spaced.
*/
#define _PICK(__index, ...) (((const u32 []){ __VA_ARGS__ })[__index])
#endif
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