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/*========================== begin_copyright_notice ============================
Copyright (C) 2017-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#include "../include/BiF_Definitions.cl"
#include "../../Headers/spirv.h"
#include "../IMF/FP32/rootn_s_la.cl"
#if defined(cl_khr_fp64)
#include "../IMF/FP64/rootn_d_la.cl"
#endif // defined(cl_khr_fp64)
float __attribute__((overloadable)) __spirv_ocl_rootn( float x, int n )
{
float result;
if(BIF_FLAG_CTRL_GET(FastRelaxedMath) && (!BIF_FLAG_CTRL_GET(APIRS)))
{
// Defined for x > 0 and n is nonzero. Derived
// implementations implement this as:
// exp2(log2( x) / n) for x > 0.
// Defined for x < 0 and n is odd. Derived
// implementations implement this as:
// -exp2(log2(-x) / n) for x < 0.
// Defined as +0 for x = +/-0 and y > 0.
// Undefined for all other cases.
float pr = x;
// TBD: Which is faster?
// Note that USC has a pattern match optimization to turn
// log-mul-exp into pow. Additionally, there are some specific
// LLVM optimizations for pow. So, preferring pow for now.
#if 0
pr = __spirv_ocl_fabs( pr );
pr = __spirv_ocl_log2( pr );
pr = pr * 1.0f / n;
pr = __spirv_ocl_exp2( pr );
#else
pr = __spirv_ocl_native_powr( pr, 1.0f / n );
#endif
// For rootn(), we'll return the positive result for both +0.0f and -0.0f.
float nr = -pr;
result = ( x >= 0.0f ) ? pr : nr; // positive result for non-negative x, else negative result
}
else
{
result = __ocl_svml_rootnf(x, n);
}
return result;
}
GENERATE_SPIRV_OCL_VECTOR_FUNCTIONS_2ARGS_VV_LOOP( rootn, float, float, int, f32, i32 )
#if defined(cl_khr_fp64)
INLINE double __attribute__((overloadable)) __spirv_ocl_rootn( double y, int x )
{
return __ocl_svml_rootn_v2(y, x);
}
GENERATE_SPIRV_OCL_VECTOR_FUNCTIONS_2ARGS_VV_LOOP( rootn, double, double, int, f64, i32 )
#endif // defined(cl_khr_fp64)
#if defined(cl_khr_fp16)
INLINE half __attribute__((overloadable)) __spirv_ocl_rootn( half y, int x )
{
return __spirv_ocl_rootn((float)y, x);
}
GENERATE_SPIRV_OCL_VECTOR_FUNCTIONS_2ARGS_VV_LOOP( rootn, half, half, int, f16, i32 )
#endif // defined(cl_khr_fp16)
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