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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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20
raid/ssse3.c
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@ -1250,7 +1250,7 @@ static __always_inline void raid_genX_ssse3ext(int nd, size_t size, void **vv, i
* Recover failure of one data block using selected parity with SSSE3, optimized for one failure.
*
* Computes the selected syndrome in a single survivor scan and reconstructs
* the missing block directly, avoiding raid_delta_gen() and the extra pass.
* the missing block directly, avoiding extra memory passes.
*/
static __always_inline void raid_rec1_ssse3_1(int *id, int *ip, int nd, size_t size, void **vv)
{
@ -1338,8 +1338,8 @@ static __always_inline void raid_rec1_ssse3_1(int *id, int *ip, int nd, size_t s
* Computes Q of all surviving data directly with Horner's method and
* reconstructs the missing block from Qdelta.
*
* Processes two 16-byte lanes per iteration, avoiding raid_delta_gen(),
* temporary parity buffers, and the extra pass over the data.
* Processes two 16-byte lanes per iteration, avoiding temporary parity
* buffers and the extra pass over the data.
*/
static __always_inline void raid_rec1_ssse3_q(int *id, int *ip, int nd, size_t size, void **vv)
{
@ -1472,8 +1472,8 @@ static __always_inline void raid_rec1_ssse3_q(int *id, int *ip, int nd, size_t s
* optimized specifically for two failures.
*
* Computes only the two selected syndromes in a single survivor scan and
* reconstructs the missing blocks directly, avoiding raid_delta_gen(),
* temporary syndrome buffers, and the generation of unused parity rows.
* reconstructs the missing blocks directly, avoiding temporary syndrome
* buffers and the generation of unused parity rows.
*
* has_p is expected to be a compile-time constant after inlining.
*
@ -1661,8 +1661,8 @@ static __always_inline void raid_rec2_ssse3_2(int has_p, int *id, int *ip, int n
* Computes Pdelta and Qdelta directly in a single survivor scan.
* Q is computed with Horner's method using the active field generator.
*
* Processes two 16-byte lanes per iteration, avoiding raid_delta_gen(),
* temporary parity buffers, and the second pass over the data.
* Processes two 16-byte lanes per iteration, avoiding temporary parity
* buffers and the second pass over the data.
*/
static __always_inline void raid_rec2of2_ssse3(int *id, int *ip, int nd, size_t size, void **vv)
{
@ -2395,8 +2395,8 @@ static __always_inline void raid_rec1_ssse3ext_1(int *id, int *ip, int nd, size_
* Computes Q of all surviving data directly with Horner's method and
* reconstructs the missing block from Qdelta.
*
* Processes four 16-byte lanes per iteration, avoiding raid_delta_gen(),
* temporary parity buffers, and the extra pass over the data.
* Processes four 16-byte lanes per iteration, avoiding temporary parity
* buffers and the extra pass over the data.
*/
static __always_inline void raid_rec1_ssse3ext_q(int *id, int *ip, int nd, size_t size, void **vv)
{
@ -3799,7 +3799,7 @@ static __always_inline void raid_recX_ssse3ext_12345(int nr, int has_p, int *id,
/*
* Recover multiple data failures using selected parity blocks with SSSE3 extended.
*
* 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