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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/powr_s_la.cl"
#if defined(cl_khr_fp64)
#include "../IMF/FP64/powr_d_la.cl"
#include "../IMF/FP64/powr_d_la_noLUT.cl"
#endif // defined(cl_khr_fp64)
INLINE float SPIRV_OVERLOADABLE SPIRV_OCL_BUILTIN(powr, _f32_f32, )( float x, float y )
{
if(BIF_FLAG_CTRL_GET(FastRelaxedMath))
{
// Undefined for x < 0.
// Undefined for x = 0 and y = 0.
// For x >= 0, derived implementations implement this as
// exp2(y * log2(x)).
//
// This expansion is technically undefined when x == 0, since
// log2(x) is undefined, however our native log2 returns -inf
// in this case. Since exp2( y * -inf ) is zero for finite y,
// we'll end up with zero, hence the "correct" results.
// For powr(), we're guaranteed that x >= 0, so no need for fabs().
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_BUILTIN(log2, _f32, )( pr );
pr = y * pr;
pr = SPIRV_OCL_BUILTIN(exp2, _f32, )( pr );
#else
pr = SPIRV_OCL_BUILTIN(native_powr, _f32_f32, )( pr, y );
#endif
// For powr(), we're guaranteed that x >= 0, so no need for
// sign fixup.
float result = pr;
return result;
}
else
{
return __ocl_svml_powrf(x, y);
}
}
GENERATE_SPIRV_OCL_VECTOR_FUNCTIONS_2ARGS_VV_LOOP( powr, float, float, float, f32, f32 )
#if defined(cl_khr_fp64)
INLINE double SPIRV_OVERLOADABLE SPIRV_OCL_BUILTIN(powr, _f64_f64, )( double x, double y )
{
double result;
if (BIF_FLAG_CTRL_GET(UseHighAccuracyMath)) {
result = __ocl_svml_powr_noLUT(x, y);
} else {
result = __ocl_svml_powr(x, y);
}
return result;
}
GENERATE_SPIRV_OCL_VECTOR_FUNCTIONS_2ARGS_VV_LOOP( powr, double, double, double, f64, f64 )
# endif // defined(cl_khr_fp64)
#if defined(cl_khr_fp16)
INLINE half SPIRV_OVERLOADABLE SPIRV_OCL_BUILTIN(powr, _f16_f16, )( half x, half y )
{
return SPIRV_OCL_BUILTIN(powr, _f32_f32, )((float)x, (float)y);
}
GENERATE_SPIRV_OCL_VECTOR_FUNCTIONS_2ARGS_VV_LOOP( powr, half, half, half, f16, f16 )
#endif // defined(cl_khr_fp16)
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