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Optimize NEON nibble mask setup using MOVI and hoist invariant initialization

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Andrea Mazzoleni 2026-08-30 21:53:28 +02:00
parent 90fa3792ef
commit 6613eb5776
2 changed files with 15 additions and 16 deletions
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10
raid/neon.c
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@ -262,9 +262,9 @@ static __always_inline void raid_genX_neon(int nd, size_t size, void **vv, int n
/* generic case with at least two data disks */
asm volatile (
"ldr q29, %0\n"
"ldr q28, %1\n"
"movi v28.16b, #0x0f\n"
:
: "m" (gfconst16.poly[0]), "m" (gfconst16.low4[0])
: "m" (gfconst16.poly[0])
);
for (i = 0; i < size; i += 32) {
@ -641,9 +641,9 @@ static __always_inline void raid_recX_neon_12(int nr, int has_p, int *id, int *i
raid_neon_begin();
for (i = 0; i < size; i += 64) {
asm volatile ("ldr q31, %0" : : "m" (gfconst16.low4[0]));
asm volatile ("movi v31.16b, #0x0f");
for (i = 0; i < size; i += 64) {
/* start all selected syndromes from the stored parity */
asm volatile ("ldr q0, %0" : : "m" (p[0][i]));
asm volatile ("ldr q1, %0" : : "m" (p[0][i + 16]));
@ -991,7 +991,7 @@ static __always_inline void raid_recX_neon(int nr, int has_p, int *id, int *ip,
* V31 is reused during reconstruction, so reload the nibble mask
* at the beginning of every iteration.
*/
asm volatile ("ldr q31, %0" : : "m" (gfconst16.low4[0]));
asm volatile ("movi v31.16b, #0x0f");
/* start all selected syndromes from the stored parity */
asm volatile ("ldr q0, %0" : : "m" (p[0][i]));