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Eliminate raid_delta_gen and convert int/neon32 REC1/REC2 to single-pass fused recovery

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Andrea Mazzoleni 2026-09-02 18:19:26 +02:00
parent 0ce89aa35d
commit ec1daddc8e
13 changed files with 70 additions and 429 deletions
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6
raid/avx2.c
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@ -1079,7 +1079,7 @@ static __always_inline void raid_rec1_avx2_1(int *id, int *ip, int nd, size_t si
*
* Computes Q of all surviving data directly with Horner's method and reconstructs the missing block from Qdelta.
*
* Processes two 32-byte lanes per iteration, avoiding raid_delta_gen(), temporary parity buffers, and the extra pass over the data.
* Processes two 32-byte lanes per iteration, avoiding temporary parity buffers, and the extra pass over the data.
*/
static __always_inline void raid_rec1_avx2_q(int *id, int *ip, int nd, size_t size, void **vv)
{
@ -1624,7 +1624,7 @@ static __always_inline void raid_recX_avx2(int nr, int has_p, int *id, int *ip,
*
* Computes Q of all surviving data directly with Horner's method and reconstructs the missing block from Qdelta.
*
* Processes two 32-byte lanes and two data disks per Horner iteration, avoiding raid_delta_gen(), temporary parity buffers, and the extra pass over the data.
* Processes two 32-byte lanes and two data disks per Horner iteration, avoiding temporary parity buffers, and the extra pass over the data.
*
* Note that it uses 16 registers, meaning that x64 is required.
*/
@ -2373,7 +2373,7 @@ static __always_inline void raid_recX_avx2ext_123(int nr, int has_p, int *id, in
* Recover multiple data failures using selected parity blocks with AVX2 extended.
*
* Compute only the selected syndromes, keeping them in registers.
* This avoids raid_delta_gen(), temporary syndrome buffers, and the
* This avoids temporary syndrome buffers and the
* generation of unused parity rows.
*
* If P is available, preserve the complete P delta syndrome and