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0de507713b
Floating point bitwise functions are now inline, also implemented a 'PopCount' function, which replicates the '__popcnt' instruction, but does not require the CPU to feature the instruction. This was mainly added as the SDK launcher doesn't check the CPU for SSSe3/popcnt, as it doesn't involve any instruction sets past SSE2.
53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
#ifndef MATHLIB_FBITS_H
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#define MATHLIB_FBITS_H
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//=============================================================================//
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//
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// Purpose: look for NANs, infinities, and underflows.
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//
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//=============================================================================//
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//-----------------------------------------------------------------------------
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// This follows the ANSI/IEEE 754-1985 standard
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//-----------------------------------------------------------------------------
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inline unsigned long& FloatBits(float& f)
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{
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return *reinterpret_cast<unsigned long*>(&f);
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}
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inline unsigned long const& FloatBits(float const& f)
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{
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return *reinterpret_cast<unsigned long const*>(&f);
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}
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inline float BitsToFloat(unsigned long i)
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{
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return *reinterpret_cast<float*>(&i);
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}
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inline bool IsFinite(float f)
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{
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return ((FloatBits(f) & 0x7F800000) != 0x7F800000);
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}
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inline unsigned long FloatAbsBits(float f)
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{
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return FloatBits(f) & 0x7FFFFFFF;
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}
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inline float FloatMakePositive(float f)
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{
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return fabsf(f); // was since 2002: BitsToFloat( FloatBits(f) & 0x7FFFFFFF ); fixed in 2010
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}
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inline float FloatNegate(float f)
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{
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return -f; //BitsToFloat( FloatBits(f) ^ 0x80000000 );
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}
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#define FLOAT32_NAN_BITS (unsigned int)0x7FC00000 // NaN!
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#define FLOAT32_NAN BitsToFloat( FLOAT32_NAN_BITS )
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#define VEC_T_NAN FLOAT32_NAN
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#endif // MATHLIB_FBITS_H
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