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[SYCL][ESIMD] Use SPIR-V rsqrt for double #15609

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[SYCL][ESIMD] Use SPIR-V rsqrt for double #15609

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5 changes: 5 additions & 0 deletions sycl/include/sycl/ext/intel/esimd/detail/math_intrin.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -102,6 +102,11 @@ extern __DPCPP_SYCL_EXTERNAL __ESIMD_raw_vec_t(T, N)
__spirv_ocl_fmax(__ESIMD_raw_vec_t(T, N),
__ESIMD_raw_vec_t(T, N)) __ESIMD_INTRIN_END;

template <typename T> extern __DPCPP_SYCL_EXTERNAL T __spirv_ocl_rsqrt(T);
template <typename T, int N>
extern __DPCPP_SYCL_EXTERNAL __ESIMD_raw_vec_t(T, N)
__spirv_ocl_rsqrt(__ESIMD_raw_vec_t(T, N)) __ESIMD_INTRIN_END;

// saturation intrinsics
template <typename T0, typename T1, int SZ>
__ESIMD_INTRIN __ESIMD_raw_vec_t(T0, SZ)
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12 changes: 8 additions & 4 deletions sycl/include/sycl/ext/intel/esimd/math.hpp
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Expand Up @@ -456,20 +456,24 @@ __ESIMD_UNARY_INTRINSIC_DEF(__ESIMD_EMATH_SPIRV_COND, cos, cos)
template <class T, int N, class Sat = saturation_off_tag>
__ESIMD_API std::enable_if_t<std::is_same_v<T, double>, simd<double, N>>
rsqrt(simd<T, N> src, Sat sat = {}) {
__ESIMD_DNS::vector_type_t<__ESIMD_DNS::__raw_t<double>, N> res =
__spirv_ocl_rsqrt<__ESIMD_DNS::__raw_t<double>, N>(src.data());
if constexpr (std::is_same_v<Sat, saturation_off_tag>)
return inv(sqrt(src));
return res;
else
return esimd::saturate<double>(inv(sqrt(src)));
return esimd::saturate<double>(res);
}

/** Scalar version. */
template <class T, class Sat = saturation_off_tag>
__ESIMD_API std::enable_if_t<std::is_same_v<T, double>, double>
rsqrt(T src, Sat sat = {}) {
__ESIMD_DNS::__raw_t<double> res =
__spirv_ocl_rsqrt<__ESIMD_DNS::__raw_t<double>>(src);
if constexpr (std::is_same_v<Sat, saturation_off_tag>)
return inv(sqrt(src));
return res;
else
return esimd::saturate<double>(inv(sqrt(src)));
return esimd::saturate<double>(simd<double, 1>(res))[0];
}

#undef __ESIMD_UNARY_INTRINSIC_DEF
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13 changes: 13 additions & 0 deletions sycl/test/check_device_code/esimd/rsqrt_double.cpp
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@@ -0,0 +1,13 @@
// RUN: %clangxx -fsycl -fsycl-device-only -S -emit-llvm %s -o - | \
// RUN: FileCheck %s --implicit-check-not=recip

// This test checks that all we use SPIR-V rsqrt for doubles.

#include <sycl/ext/intel/esimd.hpp>
#include <sycl/sycl.hpp>

SYCL_ESIMD_KERNEL SYCL_EXTERNAL void kernel() {
__ESIMD_NS::simd<double, 16> v(0, 1);
v = __ESIMD_NS::rsqrt(v);
// CHECK: __spirv_ocl_rsqrt
}
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