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UCT/IB/MLX5: Prevent compiler to replace SSE instructions by memmove() - v1.16.x #9723

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Mar 10, 2024
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UCT/IB/MLX5: Prevent compiler to replace SSE instructions by memmove() - v1.16.x #9723

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14 changes: 9 additions & 5 deletions src/uct/ib/mlx5/ib_mlx5.inl
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Original file line number Diff line number Diff line change
Expand Up @@ -504,16 +504,20 @@ size_t uct_ib_mlx5_set_data_seg_iov(uct_ib_mlx5_txwq_t *txwq,
static UCS_F_ALWAYS_INLINE void uct_ib_mlx5_bf_copy_bb(void * restrict dst,
void * restrict src)
{
#if defined( __SSE4_2__)
UCS_WORD_COPY(__m128i, dst, __m128i, src, MLX5_SEND_WQE_BB);
#elif defined(__ARM_NEON)
#if defined(__ARM_NEON)
UCS_WORD_COPY(int16x8_t, dst, int16x8_t, src, MLX5_SEND_WQE_BB);
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#else
#if defined(__SSE4_2__)
typedef __m128i uct_ib_mlx5_send_wqe_bb_block_t;
#else
typedef uint8_t uct_ib_mlx5_send_wqe_bb_block_t;
#endif
/* Prevent compiler to replace by memmove() */
typedef struct {
uint8_t data[MLX5_SEND_WQE_BB];
uct_ib_mlx5_send_wqe_bb_block_t
data[MLX5_SEND_WQE_BB / sizeof(uct_ib_mlx5_send_wqe_bb_block_t)];
} UCS_S_PACKED uct_ib_mlx5_send_wqe_bb_t;

/* Prevent the compiler to replace by memmove() */
UCS_WORD_COPY(uct_ib_mlx5_send_wqe_bb_t, dst,
uct_ib_mlx5_send_wqe_bb_t, src,
MLX5_SEND_WQE_BB);
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