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Merge pull request #10309 from tupaschoal/floor-ceil-constexpr

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Make floor2 and ceil2 constexpr functions
This commit is contained in:
Ted John
2019-12-09 22:48:20 +00:00
committed by GitHub
parent 137d47a375 aa02a8c7ce
commit e72d2aba85
1 changed files with 18 additions and 2 deletions
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20
src/openrct2/common.h
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@@ -25,6 +25,7 @@
#include <cassert>
#include <cstddef>
#include <cstdint>
#include <stdexcept>
using namespace Numerics;
@@ -50,11 +51,26 @@ const constexpr auto ror32 = ror<uint32_t>;
const constexpr auto rol64 = rol<uint64_t>;
const constexpr auto ror64 = ror<uint64_t>;
constexpr bool is_power_of_2(int v)
{
return v && ((v & (v - 1)) == 0);
}
// Rounds an integer down to the given power of 2. y must be a power of 2.
#define floor2(x, y) ((x) & (~((y)-1)))
constexpr int floor2(const int x, const int y)
{
if (!is_power_of_2(y))
throw std::logic_error("floor2 should only operate on power of 2");
return x & ~(y - 1);
}
// Rounds an integer up to the given power of 2. y must be a power of 2.
#define ceil2(x, y) (((x) + (y)-1) & (~((y)-1)))
constexpr int ceil2(const int x, const int y)
{
if (!is_power_of_2(y))
throw std::logic_error("ceil2 should only operate on power of 2");
return (x + y - 1) & ~(y - 1);
}
// Gets the name of a symbol as a C string
#define nameof(symbol) #symbol