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- minor optimization of m_fixed.h

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Use constexpr where possible to allow using these function in static initializers.
Avoid dividing by constant values. Better multiply with the inverse which is quite a bit faster.
This commit is contained in:
Christoph Oelckers 2020-09-01 19:37:05 +02:00
parent 763be58134
commit 0cc019686d
1 changed files with 8 additions and 8 deletions
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16
source/common/utility/m_fixed.h
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@ -43,7 +43,7 @@ inline int32_t FixedDiv (int32_t a, int32_t b)
return (int32_t)(((int64_t)a << 16) / b);
}
__forceinline int32_t FixedMul(int32_t a, int32_t b)
__forceinline constexpr int32_t FixedMul(int32_t a, int32_t b)
{
return (int32_t)(((int64_t)a * b) >> 16);
}
@ -53,33 +53,33 @@ inline fixed_t FloatToFixed(double f)
return xs_Fix<16>::ToFix(f);
}
inline fixed_t IntToFixed(int32_t f)
inline constexpr fixed_t IntToFixed(int32_t f)
{
// Negative shifts are undefined, so multiply instead of shifting left.
return f * FRACUNIT;
}
inline double FixedToFloat(fixed_t f)
inline constexpr double FixedToFloat(fixed_t f)
{
return f / 65536.;
return f * (1/65536.);
}
inline int32_t FixedToInt(fixed_t f)
inline constexpr int32_t FixedToInt(fixed_t f)
{
return xs_CRoundToInt(FixedToFloat(f));
}
inline unsigned FloatToAngle(double f)
inline constexpr unsigned FloatToAngle(double f)
{
return xs_CRoundToInt((f)* (0x40000000 / 90.));
}
inline double AngleToFloat(unsigned f)
inline constexpr double AngleToFloat(unsigned f)
{
return f * (90. / 0x40000000);
}
inline double AngleToFloat(int f)
inline constexpr double AngleToFloat(int f)
{
return f * (90. / 0x40000000);
}