Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose: 3DNow Math primitives.
//
//=====================================================================================//
#include <math.h>
#include <float.h> // Needed for FLT_EPSILON
#include "basetypes.h"
#include <memory.h>
#include "tier0/dbg.h"
#include "mathlib/mathlib.h"
#include "mathlib/amd3dx.h"
#include "mathlib/vector.h"
// memdbgon must be the last include file in a .cpp file!!!
#include "tier0/memdbgon.h"
#if !defined(COMPILER_MSVC64) && !defined(LINUX)
// Implement for 64-bit Windows if needed.
// Clang hits "fatal error: error in backend:" and other errors when trying
// to compile the inline assembly below. 3DNow support is highly unlikely to
// be useful/used, so it's not worth spending time on fixing.
#pragma warning(disable:4244) // "conversion from 'const int' to 'float', possible loss of data"
#pragma warning(disable:4730) // "mixing _m64 and floating point expressions may result in incorrect code"
//-----------------------------------------------------------------------------
// 3D Now Implementations of optimized routines:
//-----------------------------------------------------------------------------
float _3DNow_Sqrt(float x)
{
Assert( s_bMathlibInitialized );
float root = 0.f;
#ifdef _WIN32
_asm
{
femms
movd mm0, x
PFRSQRT (mm1,mm0)
punpckldq mm0, mm0
PFMUL (mm0, mm1)
movd root, mm0
femms
}
#elif LINUX
__asm __volatile__( "femms" );
__asm __volatile__
(
"pfrsqrt %y0, %y1 \n\t"
"punpckldq %y1, %y1 \n\t"
"pfmul %y1, %y0 \n\t"
: "=y" (root), "=y" (x)
:"0" (x)
);
__asm __volatile__( "femms" );
#else
#error
#endif
return root;
}
// NJS FIXME: Need to test Recripricol squareroot performance and accuraccy
// on AMD's before using the specialized instruction.
float _3DNow_RSqrt(float x)
{
Assert( s_bMathlibInitialized );
return 1.f / _3DNow_Sqrt(x);
}
float FASTCALL _3DNow_VectorNormalize (Vector& vec)
{
Assert( s_bMathlibInitialized );
float *v = &vec[0];
float radius = 0.f;
if ( v[0] || v[1] || v[2] )
{
#ifdef _WIN32
_asm
{
mov eax, v
femms
movq mm0, QWORD PTR [eax]
movd mm1, DWORD PTR [eax+8]
movq mm2, mm0
movq mm3, mm1
PFMUL (mm0, mm0)
PFMUL (mm1, mm1)
PFACC (mm0, mm0)
PFADD (mm1, mm0)
PFRSQRT (mm0, mm1)
punpckldq mm1, mm1
PFMUL (mm1, mm0)
PFMUL (mm2, mm0)
PFMUL (mm3, mm0)
movq QWORD PTR [eax], mm2
movd DWORD PTR [eax+8], mm3
movd radius, mm1
femms
}
#elif LINUX
long long a,c;
int b,d;
memcpy(&a,&vec[0],sizeof(a));
memcpy(&b,&vec[2],sizeof(b));
memcpy(&c,&vec[0],sizeof(c));
memcpy(&d,&vec[2],sizeof(d));
__asm __volatile__( "femms" );
__asm __volatile__
(
"pfmul %y3, %y3\n\t"
"pfmul %y0, %y0 \n\t"
"pfacc %y3, %y3 \n\t"
"pfadd %y3, %y0 \n\t"
"pfrsqrt %y0, %y3 \n\t"
"punpckldq %y0, %y0 \n\t"
"pfmul %y3, %y0 \n\t"
"pfmul %y3, %y2 \n\t"
"pfmul %y3, %y1 \n\t"
: "=y" (radius), "=y" (c), "=y" (d)
: "y" (a), "0" (b), "1" (c), "2" (d)
);
memcpy(&vec[0],&c,sizeof(c));
memcpy(&vec[2],&d,sizeof(d));
__asm __volatile__( "femms" );
#else
#error
#endif
}
return radius;
}
void FASTCALL _3DNow_VectorNormalizeFast (Vector& vec)
{
_3DNow_VectorNormalize( vec );
}
// JAY: This complains with the latest processor pack
#pragma warning(disable: 4730)
float _3DNow_InvRSquared(const float* v)
{
Assert( s_bMathlibInitialized );
float r2 = 1.f;
#ifdef _WIN32
_asm { // AMD 3DNow only routine
mov eax, v
femms
movq mm0, QWORD PTR [eax]
movd mm1, DWORD PTR [eax+8]
movd mm2, [r2]
PFMUL (mm0, mm0)
PFMUL (mm1, mm1)
PFACC (mm0, mm0)
PFADD (mm1, mm0)
PFMAX (mm1, mm2)
PFRCP (mm0, mm1)
movd [r2], mm0
femms
}
#elif LINUX
long long a,c;
int b;
memcpy(&a,&v[0],sizeof(a));
memcpy(&b,&v[2],sizeof(b));
memcpy(&c,&v[0],sizeof(c));
__asm __volatile__( "femms" );
__asm __volatile__
(
"PFMUL %y2, %y2 \n\t"
"PFMUL %y3, %y3 \n\t"
"PFACC %y2, %y2 \n\t"
"PFADD %y2, %y3 \n\t"
"PFMAX %y3, %y4 \n\t"
"PFRCP %y3, %y2 \n\t"
"movq %y2, %y0 \n\t"
: "=y" (r2)
: "0" (r2), "y" (a), "y" (b), "y" (c)
);
__asm __volatile__( "femms" );
#else
#error
#endif
return r2;
}
#endif // COMPILER_MSVC64