per_target.h (1811B)
1 // Copyright 2022 Google LLC 2 // SPDX-License-Identifier: Apache-2.0 3 // 4 // Licensed under the Apache License, Version 2.0 (the "License"); 5 // you may not use this file except in compliance with the License. 6 // You may obtain a copy of the License at 7 // 8 // http://www.apache.org/licenses/LICENSE-2.0 9 // 10 // Unless required by applicable law or agreed to in writing, software 11 // distributed under the License is distributed on an "AS IS" BASIS, 12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 // See the License for the specific language governing permissions and 14 // limitations under the License. 15 16 #ifndef HIGHWAY_HWY_PER_TARGET_H_ 17 #define HIGHWAY_HWY_PER_TARGET_H_ 18 19 #include <stddef.h> 20 #include <stdint.h> 21 22 #include "hwy/highway_export.h" 23 24 // Functions to query the capabilities of the target that will be called by 25 // HWY_DYNAMIC_DISPATCH, which is not necessarily the current target. 26 27 namespace hwy { 28 29 // Returns the HWY_TARGET which HWY_DYNAMIC_DISPATCH selected. 30 HWY_DLLEXPORT int64_t DispatchedTarget(); 31 32 // Returns size in bytes of a vector, i.e. `Lanes(ScalableTag<uint8_t>())`. 33 // 34 // Do not cache the result, which may change after calling DisableTargets, or 35 // if software requests a different vector size (e.g. when entering/exiting SME 36 // streaming mode). Instead call this right before the code that depends on the 37 // result, without any DisableTargets or SME transition in-between. Note that 38 // this involves an indirect call, so prefer not to call this frequently nor 39 // unnecessarily. 40 HWY_DLLEXPORT size_t VectorBytes(); 41 42 // Returns whether 64-bit integers, 16/64-bit floats are a supported lane type. 43 HWY_DLLEXPORT bool HaveInteger64(); 44 HWY_DLLEXPORT bool HaveFloat16(); 45 HWY_DLLEXPORT bool HaveFloat64(); 46 47 } // namespace hwy 48 49 #endif // HIGHWAY_HWY_PER_TARGET_H_