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#pragma OPENCL EXTENSION cl_khr_fp16 : enable
//------------------------------------------------------------------------------
// gelu
//------------------------------------------------------------------------------
#define GELU_COEF_A 0.044715f
#define GELU_QUICK_COEF -1.702f
#define SQRT_2_OVER_PI 0.79788456080286535587989211986876f
#define SQRT_2_INV 0.70710678118654752440084436210484f
kernel void kernel_gelu(
global float * src0,
ulong offset0,
global float * dst,
ulong offsetd
) {
src0 = (global float*)((global char*)src0 + offset0);
dst = (global float*)((global char*)dst + offsetd);
float x = src0[get_global_id(0)];
dst[get_global_id(0)] = 0.5f*x*(1.0f + tanh(SQRT_2_OVER_PI*x*(1.0f + GELU_COEF_A*x*x)));
}
kernel void kernel_gelu_4(
global float4 * src0,
ulong offset0,
global float4 * dst,
ulong offsetd
) {
src0 = (global float4*)((global char*)src0 + offset0);
dst = (global float4*)((global char*)dst + offsetd);
float4 x = src0[get_global_id(0)];
dst[get_global_id(0)] = 0.5f*x*(1.0f + tanh(SQRT_2_OVER_PI*x*(1.0f + GELU_COEF_A*x*x)));
}
kernel void kernel_gelu_erf(
global float * src0,
ulong offset0,
global float * dst,
ulong offsetd
) {
src0 = (global float*)((global char*)src0 + offset0);
dst = (global float*)((global char*)dst + offsetd);
float x = src0[get_global_id(0)];
dst[get_global_id(0)] = 0.5f*x*(1.0f + erf(x*SQRT_2_INV));
}
kernel void kernel_gelu_erf_4(
global float4 * src0,
ulong offset0,
global float4 * dst,
ulong offsetd
) {
src0 = (global float4*)((global char*)src0 + offset0);
dst = (global float4*)((global char*)dst + offsetd);
float4 x = src0[get_global_id(0)];
dst[get_global_id(0)] = 0.5f*x*(1.0f + erf(x*SQRT_2_INV));
}
kernel void kernel_gelu_quick(
global float * src0,
ulong offset0,
global float * dst,
ulong offsetd
) {
src0 = (global float*)((global char*)src0 + offset0);
dst = (global float*)((global char*)dst + offsetd);
float x = src0[get_global_id(0)];
dst[get_global_id(0)] = x*(1.0f/(1.0f+exp(GELU_QUICK_COEF*x)));
}
kernel void kernel_gelu_quick_4(
global float4 * src0,
ulong offset0,
global float4 * dst,
ulong offsetd
) {
src0 = (global float4*)((global char*)src0 + offset0);
dst = (global float4*)((global char*)dst + offsetd);
float4 x = src0[get_global_id(0)];
dst[get_global_id(0)] = x*(1.0f/(1.0f+exp(GELU_QUICK_COEF*x)));
}
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