Source/System/Image/Squish/simd_sse.h

   1 /* -----------------------------------------------------------------------------
   2
   3         Copyright (c) 2006 Simon Brown                          si@sjbrown.co.uk
   4
   5         Permission is hereby granted, free of charge, to any person obtaining
   6         a copy of this software and associated documentation files (the
   7         "Software"), to deal in the Software without restriction, including
   8         without limitation the rights to use, copy, modify, merge, publish,
   9         distribute, sublicense, and/or sell copies of the Software, and to
  10         permit persons to whom the Software is furnished to do so, subject to
  11         the following conditions:
  12
  13         The above copyright notice and this permission notice shall be included
  14         in all copies or substantial portions of the Software.
  15
  16         THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17         OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  18         MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  19         IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
  20         CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  21         TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  22         SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23
  24    -------------------------------------------------------------------------- */
  25
  26 #ifndef SQUISH_SIMD_SSE_H
  27 #define SQUISH_SIMD_SSE_H
  28
  29 #include <xmmintrin.h>
  30 #if ( SQUISH_USE_SSE > 1 )
  31 #include <emmintrin.h>
  32 #endif
  33
  34 #define SQUISH_SSE_SPLAT( a )                                                                           \
  35         ( ( a ) | ( ( a ) << 2 ) | ( ( a ) << 4 ) | ( ( a ) << 6 ) )
  36
  37 #define SQUISH_SSE_SHUF( x, y, z, w )                                                           \
  38         ( ( x ) | ( ( y ) << 2 ) | ( ( z ) << 4 ) | ( ( w ) << 6 ) )
  39
  40 namespace osgsquish {
  41
  42 #define VEC4_CONST( X ) Vec4( X )
  43
  44 class Vec4
  45 {
  46 public:
  47         typedef Vec4 const& Arg;
  48
  49         Vec4() {}
  50
  51         explicit Vec4( __m128 v ) : m_v( v ) {}
  52
  53         Vec4( Vec4 const& arg ) : m_v( arg.m_v ) {}
  54
  55         Vec4& operator=( Vec4 const& arg )
  56         {
  57                 m_v = arg.m_v;
  58                 return *this;
  59         }
  60
  61         explicit Vec4( float s ) : m_v( _mm_set1_ps( s ) ) {}
  62
  63         Vec4( float x, float y, float z, float w ) : m_v( _mm_setr_ps( x, y, z, w ) ) {}
  64
  65         Vec3 GetVec3() const
  66         {
  67 #ifdef __GNUC__
  68                 __attribute__ ((__aligned__ (16))) float c[4];
  69 #else
  70                 __declspec(align(16)) float c[4];
  71 #endif
  72                 _mm_store_ps( c, m_v );
  73                 return Vec3( c[0], c[1], c[2] );
  74         }
  75
  76         Vec4 SplatX() const { return Vec4( _mm_shuffle_ps( m_v, m_v, SQUISH_SSE_SPLAT( 0 ) ) ); }
  77         Vec4 SplatY() const { return Vec4( _mm_shuffle_ps( m_v, m_v, SQUISH_SSE_SPLAT( 1 ) ) ); }
  78         Vec4 SplatZ() const { return Vec4( _mm_shuffle_ps( m_v, m_v, SQUISH_SSE_SPLAT( 2 ) ) ); }
  79         Vec4 SplatW() const { return Vec4( _mm_shuffle_ps( m_v, m_v, SQUISH_SSE_SPLAT( 3 ) ) ); }
  80
  81         Vec4& operator+=( Arg v )
  82         {
  83                 m_v = _mm_add_ps( m_v, v.m_v );
  84                 return *this;
  85         }
  86
  87         Vec4& operator-=( Arg v )
  88         {
  89                 m_v = _mm_sub_ps( m_v, v.m_v );
  90                 return *this;
  91         }
  92
  93         Vec4& operator*=( Arg v )
  94         {
  95                 m_v = _mm_mul_ps( m_v, v.m_v );
  96                 return *this;
  97         }
  98
  99         friend Vec4 operator+( Vec4::Arg left, Vec4::Arg right  )
 100         {
 101                 return Vec4( _mm_add_ps( left.m_v, right.m_v ) );
 102         }
 103
 104         friend Vec4 operator-( Vec4::Arg left, Vec4::Arg right  )
 105         {
 106                 return Vec4( _mm_sub_ps( left.m_v, right.m_v ) );
 107         }
 108
 109         friend Vec4 operator*( Vec4::Arg left, Vec4::Arg right  )
 110         {
 111                 return Vec4( _mm_mul_ps( left.m_v, right.m_v ) );
 112         }
 113
 114         //! Returns a*b + c
 115         friend Vec4 MultiplyAdd( Vec4::Arg a, Vec4::Arg b, Vec4::Arg c )
 116         {
 117                 return Vec4( _mm_add_ps( _mm_mul_ps( a.m_v, b.m_v ), c.m_v ) );
 118         }
 119
 120         //! Returns -( a*b - c )
 121         friend Vec4 NegativeMultiplySubtract( Vec4::Arg a, Vec4::Arg b, Vec4::Arg c )
 122         {
 123                 return Vec4( _mm_sub_ps( c.m_v, _mm_mul_ps( a.m_v, b.m_v ) ) );
 124         }
 125
 126         friend Vec4 Reciprocal( Vec4::Arg v )
 127         {
 128                 // get the reciprocal estimate
 129                 __m128 estimate = _mm_rcp_ps( v.m_v );
 130
 131                 // one round of Newton-Rhaphson refinement
 132                 __m128 diff = _mm_sub_ps( _mm_set1_ps( 1.0f ), _mm_mul_ps( estimate, v.m_v ) );
 133                 return Vec4( _mm_add_ps( _mm_mul_ps( diff, estimate ), estimate ) );
 134         }
 135
 136         friend Vec4 Min( Vec4::Arg left, Vec4::Arg right )
 137         {
 138                 return Vec4( _mm_min_ps( left.m_v, right.m_v ) );
 139         }
 140
 141         friend Vec4 Max( Vec4::Arg left, Vec4::Arg right )
 142         {
 143                 return Vec4( _mm_max_ps( left.m_v, right.m_v ) );
 144         }
 145
 146         friend Vec4 Truncate( Vec4::Arg v )
 147         {
 148 #if ( SQUISH_USE_SSE == 1 )
 149                 // convert to ints
 150                 __m128 input = v.m_v;
 151                 __m64 lo = _mm_cvttps_pi32( input );
 152                 __m64 hi = _mm_cvttps_pi32( _mm_movehl_ps( input, input ) );
 153
 154                 // convert to floats
 155                 __m128 part = _mm_movelh_ps( input, _mm_cvtpi32_ps( input, hi ) );
 156                 __m128 truncated = _mm_cvtpi32_ps( part, lo );
 157
 158                 // clear out the MMX multimedia state to allow FP calls later
 159                 _mm_empty();
 160                 return Vec4( truncated );
 161 #else
 162                 // use SSE2 instructions
 163                 return Vec4( _mm_cvtepi32_ps( _mm_cvttps_epi32( v.m_v ) ) );
 164 #endif
 165         }
 166
 167         friend bool CompareAnyLessThan( Vec4::Arg left, Vec4::Arg right )
 168         {
 169                 __m128 bits = _mm_cmplt_ps( left.m_v, right.m_v );
 170                 int value = _mm_movemask_ps( bits );
 171                 return value != 0;
 172         }
 173
 174 private:
 175         __m128 m_v;
 176 };
 177
 178 } // namespace squish
 179
 180 #endif // ndef SQUISH_SIMD_SSE_H