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AK: Add AK::ceil(float) and AK::ceil_log2(integer)
Co-authored-by: Leon Albrecht <leon2002.la@gmail.com>
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072a78b958
Notes:
sideshowbarker
2024-07-17 09:52:05 +09:00
Author: https://github.com/MacDue Commit: https://github.com/SerenityOS/serenity/commit/072a78b958 Pull-request: https://github.com/SerenityOS/serenity/pull/14413 Reviewed-by: https://github.com/Hendiadyoin1 Reviewed-by: https://github.com/alimpfard
@ -24,6 +24,17 @@ constexpr T log2(T x)
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return x ? (8 * sizeof(T) - 1) - count_leading_zeroes(static_cast<MakeUnsigned<T>>(x)) : 0;
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}
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template<Integral T>
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constexpr T ceil_log2(T x)
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{
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if (!x)
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return 0;
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T log = AK::log2(x);
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log += (x & ((1 << (log - 1)) - 1)) != 0;
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return log;
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}
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template<Integral I>
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constexpr I pow(I base, I exponent)
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{
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14
AK/Math.h
14
AK/Math.h
@ -8,6 +8,7 @@
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#include <AK/BuiltinWrappers.h>
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#include <AK/Concepts.h>
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#include <AK/NumericLimits.h>
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#include <AK/StdLibExtraDetails.h>
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#include <AK/Types.h>
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@ -665,6 +666,19 @@ constexpr T pow(T x, T y)
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return exp2<T>(y * log2<T>(x));
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}
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template<FloatingPoint T>
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constexpr T ceil(T num)
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{
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if (is_constant_evaluated()) {
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if (num < NumericLimits<i64>::min() || num > NumericLimits<i64>::max())
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return num;
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return (static_cast<double>(static_cast<i64>(num)) == num)
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? static_cast<i64>(num)
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: static_cast<i64>(num) + ((num > 0) ? 1 : 0);
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}
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return __builtin_ceil(num);
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}
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#undef CONSTEXPR_STATE
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}
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