42 lines
1.6 KiB
Plaintext
42 lines
1.6 KiB
Plaintext
/*
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* Copyright (c) 2024 by FlashInfer team.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef FLASHINFER_FRAG_LAYOUT_SWIZZLE_CUH_
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#define FLASHINFER_FRAG_LAYOUT_SWIZZLE_CUH_
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#include <cuda_runtime.h>
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#include <cstdint>
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__device__ __forceinline__ uint32_t frag_layout_swizzle_16b_to_8b(uint32_t x) {
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uint32_t tmp = __shfl_xor_sync(0xffffffff, x, 0x1);
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x = __byte_perm(x, tmp, ((threadIdx.x & 0x1) == 0) ? 0x5410 : 0x3276);
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tmp = __shfl_xor_sync(0xffffffff, x, 0x2);
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x = __byte_perm(x, tmp, ((threadIdx.x & 0x2) == 0) ? 0x5410 : 0x3276);
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return x;
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}
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__device__ __forceinline__ uint32_t frag_layout_swizzle_16b_to_8b_trans(uint32_t x) {
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uint32_t tmp = __shfl_xor_sync(0xffffffff, x, 0x4);
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x = __byte_perm(x, tmp, ((threadIdx.x & 0x4) == 0) ? 0x6420 : 0x3175);
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tmp = __shfl_xor_sync(0xffffffff, x, 0x8);
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x = __byte_perm(x, tmp, ((threadIdx.x & 0x8) == 0) ? 0x5410 : 0x3276);
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tmp = __shfl_xor_sync(0xffffffff, x, 0x10);
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x = __byte_perm(x, tmp, ((threadIdx.x & 0x10) == 0) ? 0x5410 : 0x3276);
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return x;
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}
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#endif // FLASHINFER_FRAG_LAYOUT_SWIZZLE_CUH_
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