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Loosen sse read restrictions. Tested.

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This commit is contained in:
Steve Checkoway
2006-12-11 13:26:12 +00:00
parent 6c9632bdc6
commit 02282d4a14
1 changed files with 53 additions and 14 deletions
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stepmania/src/archutils/Darwin/VectorHelper.cpp
+53 -14
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@@ -536,14 +536,16 @@ void Vector::FastSoundWrite( int32_t *dest, const int16_t *src, unsigned size, s
*(dest++) += *(src++) * volume;
}
void Vector::FastSoundRead( int16_t *dest, const int32_t *src, unsigned size )
template<typename T>
static inline void Read( T load, int16_t *&dest, const int32_t *&src, unsigned &size ) __attribute__((always_inline));
template<typename T>
static inline void Read( T load, int16_t *&dest, const int32_t *&src, unsigned &size )
{
// Both dest and src are aligned. Still need to watch out for register spill.
__m128i zero = _mm_setzero_si128();
while( size >= 8 )
{
__m128i data1 = _mm_load_si128( (__m128i *)(src + 0) );
__m128i data2 = _mm_load_si128( (__m128i *)(src + 4) );
__m128i data1 = load( (__m128i *)(src + 0) );
__m128i data2 = load( (__m128i *)(src + 4) );
__m128i mask1 = _mm_cmplt_epi32( data1, zero );
__m128i mask2 = _mm_cmplt_epi32( data2, zero );
__m128i t1 = _mm_srai_epi32( data1, 31 );
@@ -566,8 +568,8 @@ void Vector::FastSoundRead( int16_t *dest, const int32_t *src, unsigned size )
}
if( size )
{
__m128i data1 = _mm_load_si128( (__m128i *)(src + 0) );
__m128i data2 = size > 4 ? _mm_load_si128( (__m128i *)(src + 4) ) : zero;
__m128i data1 = load( (__m128i *)(src + 0) );
__m128i data2 = size > 4 ? load( (__m128i *)(src + 4) ) : zero;
__m128i mask1 = _mm_cmplt_epi32( data1, zero );
__m128i mask2 = _mm_cmplt_epi32( data2, zero );
__m128i t1 = _mm_srai_epi32( data1, 31 );
@@ -590,22 +592,42 @@ void Vector::FastSoundRead( int16_t *dest, const int32_t *src, unsigned size )
_mm_maskmoveu_si128( data1, data2, (char *)dest );
}
}
void Vector::FastSoundRead( int16_t *dest, const int32_t *src, unsigned size )
{
while( (intptr_t(dest) & 0xF) && size )
{
// Misaligned stores are very slow.
*dest++ = max( -32768, min(*src++>>8, 32767) );
--size;
}
// Specialize loads.
if( intptr_t(src) & 0xF )
Read( _mm_loadu_si128, dest, src, size );
else
Read( _mm_load_si128, dest, src, size );
while( size-- )
*dest++ = max( -32768, min(*src++>>8, 32767) );
}
void Vector::FastSoundRead( float *dest, const int32_t *src, unsigned size )
template<typename T>
static inline void Read( T load, float *&dest, const int32_t *&src, unsigned &size ) __attribute__((always_inline));
template<typename T>
static inline void Read( T load, float *&dest, const int32_t *&src, unsigned &size )
{
/* m = -32768; M = 32767
* (x-2^8*m)(1-(-1))/(2^8*M-2^8*m)+(-1)
* (x-2^8*m)/(2^7*(M-m))+(-1)
* l1 = 2^8*m = -8388608
* scale = 1/(2^7*(M-m)) = 0.00000011921110856794
* l2 = -1 */
* (x-2^8*m)(1-(-1))/(2^8*M-2^8*m)+(-1)
* (x-2^8*m)/(2^7*(M-m))+(-1)
* l1 = 2^8*m = -8388608
* scale = 1/(2^7*(M-m)) = 0.00000011921110856794
* l2 = -1 */
__m128 scale = _mm_set1_ps( 0.00000011921110856794f );
__m128i l1 = _mm_set1_epi32( -8388608 );
__m128 l2 = _mm_set1_ps( -1.0f );
while( size >= 4 )
{
__m128i data = _mm_sub_epi32( _mm_load_si128((__m128i *)src), l1 );
__m128i data = _mm_sub_epi32( load((__m128i *)src), l1 );
__m128 result = _mm_cvtepi32_ps( data );
result = _mm_add_ps( _mm_mul_ps(result, scale), l2 );
@@ -620,13 +642,30 @@ void Vector::FastSoundRead( float *dest, const int32_t *src, unsigned size )
__m128i storeMask = _mm_set_epi8( 0, 0, 0, 0, X(3), X(3), X(3), X(3),
X(2), X(2), X(2), X(2), -1, -1, -1, -1 );
#undef X
__m128i data = _mm_sub_epi32( _mm_load_si128((__m128i *)src), l1 );
__m128i data = _mm_sub_epi32( load((__m128i *)src), l1 );
__m128 result = _mm_cvtepi32_ps( data );
result = _mm_add_ps( _mm_mul_ps(result, scale), l2 );
// This might not be valid.
_mm_maskmoveu_si128( (__m128i)result, storeMask, (char *)dest );
}
}
void Vector::FastSoundRead( float *dest, const int32_t *src, unsigned size )
{
while( (intptr_t(dest) & 0xF) && size )
{
// Misaligned stores are very slow.
*dest++ = float( *src++ + 32768*256 ) * 1.1921110856794079500e-7f - 1.0f;
--size;
}
// Specialize loads.
if( intptr_t(src) & 0xF )
Read( _mm_loadu_si128, dest, src, size );
else
Read( _mm_load_si128, dest, src, size );
while( size-- )
*dest++ = float( *src++ + 32768*256 ) * 1.1921110856794079500e-7f - 1.0f;;
}
#else
#error huh?