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Snippets from Guido to optimise Reduce

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This commit is contained in:
Peter Boyle 2015-04-23 08:31:40 +01:00
parent 5c8858f31b
commit a37a9789c9
1 changed files with 32 additions and 7 deletions
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39
lib/simd/Grid_vComplexF.h
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@ -213,19 +213,44 @@ friend inline void vstore(const vComplexF &ret, ComplexF *a){
friend inline ComplexF Reduce(const vComplexF & in)
{
#ifdef SSE4
#error
union {
__m128 v1; // SSE 4 x float vector
float f[4]; // scalar array of 4 floats
} u128;
u128.v1= _mm_add_ps(v, _mm_shuffle_ps(v, v, 0b01001110)); // FIXME Prefer to use _MM_SHUFFLE macros
return ComplexF(u128.f[0], u128.f[1]);
#endif
#if defined (AVX1) || defined(AVX2)
// FIXME this is inefficient and use
__attribute__ ((aligned(32))) float c_[8];
_mm256_store_ps(c_,in.v);
return ComplexF(c_[0]+c_[2]+c_[4]+c_[6],c_[1]+c_[3]+c_[5]+c_[7]);
#ifdef AVX1
//it would be better passing 2 arguments to saturate the vector lanes
union {
__m256 v1;
float f[8];
} u256;
//SWAP lanes
__m256 t0 = _mm256_permute2f128_ps(in.v, in.v, 1);
__m256 t1 = _mm256_permute_ps(in.v , 0b11011000);//real (0,2,1,3)
__m256 t2 = _mm256_permute_ps(t0 , 0b10001101);//imag (1,3,0,2)
t0 = _mm256_blend_ps(t1, t2, 0b0101000001010000);// (0,0,1,1,0,0,1,1)
t1 = _mm256_hadd_ps(t0,t0);
u256.v1 = _mm256_hadd_ps(t1, t1);
return ComplexF(u256.f[0], u256.f[4]);
#endif
#ifdef AVX2
union {
__m256 v1;
float f[8];
} u256;
const __m256i mask= _mm256_set_epi32( 7, 5, 3, 1, 6, 4, 2, 0);
__m256 tmp1 = _mm256_permutevar8x32_ps(in.v, mask);
__m256 tmp2 = _mm256_hadd_ps(tmp1, tmp1);
u256.v1 = _mm256_hadd_ps(tmp2, tmp2);
return ComplexF(u256.f[0], u256.f[4]);
#endif
#ifdef AVX512
return ComplexF(_mm512_mask_reduce_add_ps(0x5555, in.v),_mm512_mask_reduce_add_ps(0xAAAA, in.v));
#endif
#ifdef QPX
#error
#endif
}