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Common: Fix incorrect condition in PreviousPow2/NextPow2

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Stenzek 2024-11-21 12:10:26 +10:00
parent 378fd80e3d
commit e6892e0a54
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1 changed files with 10 additions and 7 deletions
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17
src/common/align.h
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@ -58,14 +58,17 @@ constexpr T PreviousPow2(T value)
value |= (value >> 1); value |= (value >> 1);
value |= (value >> 2); value |= (value >> 2);
value |= (value >> 4); value |= (value >> 4);
if constexpr (sizeof(T) >= 16) if constexpr (sizeof(T) >= 2)
value |= (value >> 8); value |= (value >> 8);
if constexpr (sizeof(T) >= 32) if constexpr (sizeof(T) >= 4)
value |= (value >> 16); value |= (value >> 16);
if constexpr (sizeof(T) >= 64) if constexpr (sizeof(T) >= 8)
value |= (value >> 32); value |= (value >> 32);
return value - (value >> 1);
return (value >> 1) + 1;
} }
/// NOTE: Undefined for values greater than (1 << BITS-1), i.e. 0x80000000 for 32-bit.
template<typename T> template<typename T>
constexpr T NextPow2(T value) constexpr T NextPow2(T value)
{ {
@ -77,11 +80,11 @@ constexpr T NextPow2(T value)
value |= (value >> 1); value |= (value >> 1);
value |= (value >> 2); value |= (value >> 2);
value |= (value >> 4); value |= (value >> 4);
if constexpr (sizeof(T) >= 16) if constexpr (sizeof(T) >= 2)
value |= (value >> 8); value |= (value >> 8);
if constexpr (sizeof(T) >= 32) if constexpr (sizeof(T) >= 4)
value |= (value >> 16); value |= (value >> 16);
if constexpr (sizeof(T) >= 64) if constexpr (sizeof(T) >= 8)
value |= (value >> 32); value |= (value >> 32);
value++; value++;
return value; return value;