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FNMA asm-instruction

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This commit is contained in:
Joachim Schöberl 2020-12-22 09:37:09 +01:00
parent f81a445585
commit c1c10174be
2 changed files with 44 additions and 0 deletions
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36
libsrc/core/simd_avx.hpp
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@ -174,6 +174,42 @@ namespace ngcore
NETGEN_INLINE SIMD<double,4> ceil (SIMD<double,4> a) { return _mm256_ceil_pd(a.Data()); }
NETGEN_INLINE SIMD<double,4> fabs (SIMD<double,4> a) { return _mm256_max_pd(a.Data(), (-a).Data()); }
#ifdef __FMA__
NETGEN_INLINE SIMD<double,4> FMA (SIMD<double,4> a, SIMD<double,4> b, SIMD<double,4> c)
{
return _mm256_fmadd_pd (a.Data(), b.Data(), c.Data());
}
NETGEN_INLINE SIMD<double,4> FMA (const double & a, SIMD<double,4> b, SIMD<double,4> c)
{
return _mm256_fmadd_pd (_mm256_set1_pd(a), b.Data(), c.Data());
}
#endif
#if defined(__FMA__) && !defined(__AVX512F__)
// make sure to use the update-version of fma
// important in matrix kernels using 12 sum-registers, 3 a-values and updated b-value
// avx512 has enough registers, and gcc seems to use only the first 16 z-regs
NETGEN_INLINE void FMAasm (SIMD<double,4> a, SIMD<double,4> b, SIMD<double,4> & sum)
{
asm ("vfmadd231pd %[a], %[b], %[sum]"
: [sum] "+x" (sum.Data())
: [a] "x" (a.Data()), [b] "x" (b.Data())
);
}
NETGEN_INLINE void FNMAasm (SIMD<double,4> a, SIMD<double,4> b, SIMD<double,4> & sum)
{
asm ("vfnmadd231pd %[a], %[b], %[sum]"
: [sum] "+x" (sum.Data())
: [a] "x" (a.Data()), [b] "x" (b.Data())
);
}
#endif
NETGEN_INLINE SIMD<mask64,4> operator<= (SIMD<double,4> a , SIMD<double,4> b)
{ return _mm256_cmp_pd (a.Data(), b.Data(), _CMP_LE_OQ); }
NETGEN_INLINE SIMD<mask64,4> operator< (SIMD<double,4> a , SIMD<double,4> b)

8
libsrc/core/simd_generic.hpp
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@ -527,6 +527,14 @@ namespace ngcore
sum = FMA(a,b,sum);
}
// update form of fms
template <int N>
void FNMAasm (SIMD<double,N> a, SIMD<double,N> b, SIMD<double,N> & sum)
{
sum -= a*b;
}
template <int i, typename T, int N>
T get(SIMD<T,N> a) { return a[i]; }