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#include <metal_stdlib>
using namespace metal;
METAL_FUNC uint get_strided_index(
uint idx,
constant size_t &num_dims,
constant size_t *dims,
constant size_t *strides
) {
uint strided_i = 0;
for (uint d = 0; d < num_dims; d++) {
uint dim_idx = num_dims - 1 - d;
strided_i += (idx % dims[dim_idx]) * strides[dim_idx];
idx /= dims[dim_idx];
}
return strided_i;
}
template<typename T, typename ID>
METAL_FUNC void where_cond(
constant size_t &numel,
constant size_t &num_dims,
constant size_t *dims,
constant size_t *strides,
constant size_t *strides_t,
constant size_t *strides_f,
device const ID *ids,
device const T *t,
device const T *f,
device T *out,
uint i [[ thread_position_in_grid ]]
) {
if (i >= numel){
return;
}
uint strided_i = get_strided_index(i, num_dims, dims, strides);
uint strided_i_t = get_strided_index(i, num_dims, dims, strides_t);
uint strided_i_f = get_strided_index(i, num_dims, dims, strides_f);
out[i] = ids[strided_i] ? t[strided_i_t] : f[strided_i_f];
}
#define WHERE_OP(T, ID, FN_NAME) \
kernel void FN_NAME( \
constant size_t &numel, \
constant size_t &num_dims, \
constant size_t *dims, \
constant size_t *strides, \
constant size_t *strides_t, \
constant size_t *strides_f, \
device const ID *ids, \
device const T *t, \
device const T *f, \
device T *out, \
uint i [[ thread_position_in_grid ]] \
) { \
where_cond<T, ID>(numel, num_dims, dims, strides, strides_t, strides_f, ids, t, f, out, i); \
} \
WHERE_OP(half, uint32_t, where_u32_f16)
WHERE_OP(float, uint32_t, where_u32_f32)
WHERE_OP(uint8_t, uint32_t, where_u32_u8)
WHERE_OP(uint32_t, uint32_t, where_u32_u32)
WHERE_OP(half, uint8_t, where_u8_f16)
WHERE_OP(float, uint8_t, where_u8_f32)
WHERE_OP(uint8_t, uint8_t, where_u8_u8)
WHERE_OP(uint32_t, uint8_t, where_u8_u32)
#if __METAL_VERSION__ >= 220
WHERE_OP(int64_t, uint8_t, where_u8_i64)
WHERE_OP(int64_t, uint32_t, where_u32_i64)
WHERE_OP(half, int64_t, where_i64_f16)
WHERE_OP(float, int64_t, where_i64_f32)
WHERE_OP(uint8_t, int64_t, where_i64_u8)
WHERE_OP(uint32_t, int64_t, where_i64_u32)
WHERE_OP(int64_t, int64_t, where_i64_i64)
#if defined(__HAVE_BFLOAT__)
WHERE_OP(bfloat, int64_t, where_i64_bf16)
#endif
#endif
#if defined(__HAVE_BFLOAT__)
WHERE_OP(bfloat, uint8_t, where_u8_bf16)
WHERE_OP(bfloat, uint32_t, where_u32_bf16)
#endif
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